MARINE VHF RADIOTELEPHONE
MODEL
FM-8700
F I R S T E D I T I O N : A U G 1 9 9 8 Yo u r L o c a l A g e n t / D e a l e r
FURUNO E L E C T R I C C O., LT D.
c 9 - 5 2 , A s h i h a r a - c h o , N i s h i n o m i y a , J a p a n 6 6 2 Te l e p h o n e : 0 7 9 8 - 6 5 - 2 1 1 1 Te l e f a x : 0 7 9 8 - 6 5 - 4 2 0 0 A l l r i g h t s r e s e r v e d . Printed in Japan P U B . N o . S M E - 5 6 1 7 0 - A F M - 8 7 0 0 ( K A O K )CONTENTS
Chapter 1 BLOCK DESCRIPTION
1.1 General 1-1
1.2 Input/output data format of FM-8700 1-2
1.3 DX-8700 input/output signals 1-4
1.4 Main function of PC boards 1-6
1.5 Block description 1-9 1. DX-8700 antenna system 1-9 2. DSC Receiver section 1-10 3. Transmitter section 1-11 4. Receiver section 1-13 5. Controller section 1-15
6. Power supply section 1-19
7. IF-8500 (Printer interface) 1-20
Chapter 2 Location of Parts
1. Control Panel 2-1
2. Rear Panel 2-1
3. Bottom View, Cover removed 2-2
4. CONTROL Board 2-2
5. Bottom View (CONTROL Board and the removed) 2-3
6. Panel 2-3
7. Duplexer (DX-8700) 2-4
Chapter 3 Change of System Setting
3.1 Outline of system setting 3-1
3.3 Change of system setting 3-4
1. Setting DSC (Selection of receiver) 3-4
2. Setting RT (Function of VHF section) 3-6
3. Setting CH (Channel presetting) 3-8
4. Setting PO (Setting transmitting power) 3-10 5. Setting L (Selection LCD display, Japanese and English) 3-12
3.4 Change of jumper setting 3-13
3.5 Confirmation of ID number 3-14
3.6 Changing ID number and ON/OFF of Private mode 3-15
Chapter 4 Adjustment and Measurement
4.1 Transmitting frequency and power 4-1
4.2 Measurements on CH70 4-2
1. Mode change 4-3
4.3 Other measurements 4-6
1. Confirmation of receiver sensitivity 4-6
2. Confirmation of transmitting modulation degree 4-7 3. Confirmation of receiving sensitivity of CH70 RX board 4-8
Chapter 5 Maintenance check
5.1 Periodical check 5-1
1. Cleaning of display portion 5-1
2. Check of loose connectors 5-1
3. Antenna 5-1
5.2 Everyday oprational test (Self-test) 5-2
5.3 Exchanging the nickel-cadmium battery 5-5
5.4 Exchanging ROM 5-6
Chapter 6 Troubleshooting
6.1 Functional tests
6-1
1. RAM/ROM test
6-2
2. Remote line test
6-3
3. Keyboard test
6-4
4. Display (LCD) test
6-4
5. Printer test
6-5
6.2 Error messages
6-6
1. CPU communication errors
6-6
6.3 Confirmation by line monitor
6-7
6.4 Guidelines for troubleshooting
6-8
6.5 Board compatibility
6-11
Specifications
AP1-1
Private Channel List
AP2-1
Mechanical Parts List
M-1
1.1 General
FM-8700 is a full-duplex international VHF radio-telephone which includes a VHF DSC function and a VHF watch receiver. The system consists of a transmitter- receiver unit and a duplexer unit, operating from DC 24 V (+30%, -10%) power supply.
External devices such as remote station (RB-700), distress message controller (DMC-5), printer, navigation device (outputs location and time data in NMEA format), wing handset, and external speaker can be connected to this system.
If a printer is used, a printer interface unit (IF-8500) is required. The system connection diagram is shown below.
ANT CH70RX
Navigation Device
Wing Handset (port)
Wing Handset (Starboard)
Handset Hanger (HSC701K-BX21)
EXT Speaker
Remote Station (RB-'700)
AC/DC Power supply unit
(PR-300/240)
Distress Message Controller (DMC-5)
Printer Interface (IF-8500) DX-8700
TX ANT RX ANT NMEA
POWER DMC PRINTER REMOTE EXT SPKR HANDSET FM-8700 W-HANDSET NMEA W-HANDSET Printer DC24V + 30 , -10% (7A MAX) DC24V + 30 , -10% (7A MAX) AC100/220VAC * * * * * * * * * * NOTE) DB-500 is required when additional RB-700(s) is connected. * Note) *:operational
Chapter 1 BLOCK DESCRIPTION
Operational Priority 1. DMC-5 2. FM-8700 3. RB-700
1-2
1.2 Input/output data format of FM-8700
The designation of connectors for the input-output signals and their electrical specifications are shown below.
ð ð ð ð 8P 4P 6P 7P 16P CH70 RX ANT (RX ANT) ANT (TX ANT) REMOTE HANDSET 24V DC
NMEA DMC PRINTER WING HANDSET GND
1 2
EXT SP BREAKER
Fig.1-2 Layout of the connectors on the rear panel of FM-8700 Table 1-1/2
Connector Name
Connector
type Pins Signal Remarks
TX ANT M-R type 50 Ω RX ANT M-R type 50 Ω 1. +24V 24V DC HS16R-2 2. –24V 24V+30,-10% 1. 0V 2. PTT SW 3. MIC (H) 4. MIC (C) -46dBm (600 Ω) 5. HS SP (H) 0dBm (200 Ω) Main Handset FM-10RS-6H 6. HOOK SW 1. 0V GND 2. W-PTT SW RS-410N Open collector 3.W-MIC -46dBm (600 Ω) or 0dBm (40 Ω)
Part and starboard microphones are connected in parallel. Microphone type, carbon or dynamic must be selected on FM-8700. 4. W-SP 1mW (200 Ω) 5. T15V (TX) 6. +15V
7. DUP/SIMP RS-410N Open collector Wing Handset FM214-7SM
Table 1-2/2
Terminal Connector Pin Description Signal Remarks
1. TXD (H) 2. TXD (C) NMEA 3. RXD (H) 4. RXD (C) NMEA IEC1162-1 (ZDA, GLL, RMC) 5. CH70RX (H) 6. CH70RX (C) 0dBm (600 Ω) NMEA FM214-7SM 7. POW 1. TXD (H) 2. TXD (C) 3. RXD (H) 4. RXD (C) MIF 5. F-GND DMC FM214-6SM 6. ALM 1. TXD (H) 2. TXD (C) 3. RXD (H) PRINTER FM214-4SM 4. RXD (C) MIF 1. TXD (H) 2. TXD (C) 3. RXD (H) 4. RXD (C) MIF 5. F-GND 6. 15V 1A MAX 7. NC 8. NC 9. 0V 10. LINE OUT (H) 11. LINE OUT (C) 0dBm (600 Ω) 12. LINE IN (H) 13. LINE IN (C) 0dBm (600 Ω)
14. TX KEY RS-410N Open collector 15. NC
REMOTE SRCN-16P
1-4
1.3 DX-8700 input/output signals
The logout of the connectors on the DX-8700 and its specifications are shown below.
ANT RX OUT CH70 RX ANT NMEA WING HANDSET TX IN NMEA WING HANDSET FM-8700 Connectors ~ ~ Fig.1-3 Connectors on DX-8700 Table 2-1/2 Connector Name Connector
type Pins Signal Remarks
ANT M-R type 50 Ω CH70 RX ANT M-R type 50 Ω TX IN M-P type 50 Ω RX OUT M-P type 50 Ω 1. 0V Signal GND 2. W-PTTSW 3. W-MIC -46dBm (600 Ω) or 0dBm (40 Ω)
Part and starboard microphones are connected in parallel. Microphone type, carbon or dynamic must be selected on FM-8700. 4. W-SP 0dBm (200 Ω) 5. T15V (TX) 6. +15V
7. DUP/SIMP RS-410N Open collector
8. 0V Signal GND
Wing Handset FM14-7P
Table 2-2/2
Connector Name
Connector
type Pins Signal Remarks
1. 0V GND
2. W-PTT SW RS-410N Open collector
3. W-MIC -46dBm (600 Ω) or 0dBm (40 Ω)
Part and starboard microphones are connected in parallel. Microphone type, carbon or dynamic must be selected on FM-8700. 4. W-SP 1mW (200 Ω) 5. F-GND 6. TXD (H) 7. TXD (C) 8. RXD (H) 9. RXD (C) NMEA IEC1162-1 (ZDA, GLL, RMC) Wing Handset Terminal
Board 10. F-GND 1. TXD (H) 2. TXD (C) 3. RXD (H) 4. RXD (C) NMEA IEC1162-1 (ZDA, GLL, RMC) 5. CH70 RX (H) 6. CH70 RX (C) 0dBm (600 Ω) 7. POW NMEA FM14-8P 8. F-GND
1-6
1.4
Main functions of PC-boards
The system block diagram of FM-8700 and DX-8700 is shown in Fig.1-4. The main functions of each PC-board are shown in Table 3 on the following pages.
FILTER PCB (05P0673) POWER PCB (05P0617) TX PCB (05P0618A) CH70 RX PCB (05P0675) DUPLEXER PANEL PCB (05P615) * LCD/LED/KEY CONTROL PCB (05P0616A) RX PCB (05P0672) (DC24V)
NMEA PRINT DATA
TB-1 PRINTER I/F (IF-8500) PRINTER (PP-510) DC24V NBDP VHF DSC MF/HF DSC WING HANDSET
(Both wings, Parallel Connection) ANT
CH70 RX ANT
D-RX D-TX
D-ANT
TX IN
RX OUT NMEA W-HANDSET
W-MIC, SP, W-PTT, +15V, DUP/SIMP ,TX
DMC-5 RB-700
24V DC NMEA WING HANDSET PRINTER DMC
ANT
CH70RX ANT REMOTE HANDSET
HANDSET
T/RD
T/RD, ALARM T/RD, +15V, LINE IN/ OUT, TX KYE MIC, SP, PTT SW, HOOK SW
+24V SW Braker : 10A +15V AF VR SQ VR MODE/CH SW SP SW AUTO/ SCAN /DW/OFF
RX Freq, CONT DATA SQ DET/SIG HS SP TX Freq DATA POWER CONT MOD TX9V 9V EXT SP INT SP LINE OUT POWER DET +15V +15V +15V (RX PCB) +15V DSC CPU : H8 VHF CPU : V25 MODEM FM-8700 DX-8700 TX OUT
RX OUT LINE MON
DUP/SIMP
TX
T/RD, CH70RX, POW
FM-8700
Main PC-boards of FM-8700 and their functions are shown in the table below.
Table 3-1/2
PC-boards Main functions and Circuits
TX (05P0618 A)
Contains circuits for transmitting modulator, local oscillator, power amplifier, and delivers 25/1W outputs every 25 kHz step at 155.0 - 156.475 MHz.
1 A local oscillator circuit for transmission (synthesizer PLL)
2 A reactance modulator (G3E, G2B) and its amplifier
3 A transmission power amplifier and a transmission power controller
RX (05P0672)
Consists of a double-super heterodyne receiver circuit at 155.0 - 166.075 MHz, (receiving sensitivity; 20 dB, SINAD; less than 0 dB, first IF; 21.4 MHz, second IF;455 kHz).
1 First local oscillator circuit (synthesizer PLL: 21.4 MHz)
2 Second local oscillator circuit (crystal-control; 20.945 MHz)
3 Squelch circuit (controlled by carrier detection and sound detection)
4 AF power amplifier circuit (8 Ω, 3W output with 10% distortion) CONTROL
(05P0616 A)
Includes CPU for VHF, CPU for DSC, MODEM, ROM, EEROM and I/O. VHF and remote control with VHF CPU (µPD70320GJ : V25)
DSC function with DSC CPU (HD6475328CP : H8) and MODEM
TX AF monitor control circuit and TX AF LINE input signal selection circuit
FILTER
(05P0673) Consists of filter circuits for connected signal lines.
PANEL (05P0615)
1 LCD drive circuit (for DSC)
2 LED drive circuit (for VHF)
3 Keyboard circuit
FM-8700
POWER (05P0617)
Generates 15V output by series power supply circuit from DC 24V input.
1 Over voltage protection: +32 V and low voltage detection: +20 V
2 Temperature detection sensor mounted on U2
* gradually decreases the transmitting power by detecting a temperature from 70 to 80 °C.
1-8 DX-8700
Main PC-boards of DX-8700 and their functions are shown in the table below.
Table 3-2/2
PC-boards Main functions and Circuits
Duplexer (05P0674)
Consists of filters for duplex operation.
1 Transmitting filter: BEF characteristics with three stagger cavities. (156.0 - 157.5 MHz, the power loss; less than 1.4 dB)
2 Receiving filter: BEF characteristics by four stagger cavities. (160.6 - 162.1 MHz, the power loss; less than 1.6 dB)
DX-8700
CH70 RX (05P0675)
Consists of a double-super heterodyne receiver circuit used exclusively for non-intermittent listening to DSC CH70 (156.525 MHz).Receiving sensitivity; 20 dB, SINAD; less than 0 dB, the first IF; 16.9 MHz, the second IF; 455 kHz
1 First local oscillator circuit (crystal-control; 139.625 MHz)
2 Second local oscillator circuit (crystal-control; 16.455 MHz)
3 DUP/SIMP switching circuit (relay control)
4 Connecting terminals for WING HANDSET and NMEA
1.5 Block description
1. DX-8700 antenna system Dup Simp Dup Simp Dup ANT TR ANT Simp Dup Dup TX Dup RX TX IN Duplexer C35 DET CR4 Buff U1 (2/2) POW Q3, 4 Q1, 2 Deviser T1 K3 K1 K2 K4 (CR1) Tx Rx RX OUT CH70 RX CH 70 ANT J5 J6 CH 70 RX AFTX level monitor signal
(DSC RX Signal) TR ANT CH70 RX ANT +15V DUP/SIP K1 K2 K3 DUP/SIP W5 K4 TX Q5
Fig.1-5 DX-8700 Antenna System
DX-8700 consists of CH70 RX board (05P0675) and Duplexer (05P0674). The CX70 RX circuit contains an antenna switching circuit and CH70 RX circuit. K1 - K3 are relays. The antenna is selected by DUP/SIMP control signal from the main unit.
The transmitting signal output from the main unit is input to <TX IN> and switched by K4.
The TR ANT antenna can transmit/receive VHF signals and receive CH70 signal.
When a CH70 receiving antenna is used, <CH70 ANT> is internally connected to "CH70 RX circuit, J6" with a coaxial cable.
1-10 2. DSC Receiver section OSC OSC DET Q11 FL1 156.525MHz U3 Q12 FL2 16.9MHz Q13 Y2 16.445MHz FL3 455kHz U4 (MC3361CD) U2 (1/2) 34.90625MHz Y1 ×4 139.625MHz (3SK302GR) (GN2011) (2SK937-Y5-AA) (3SK302GR) (NJM2094M) Q14 Q15 (2SC3123) C73 TP2 J6 J5 W5 CH70 RX ANT DEVISER T1 S D K3 RX OUT Q1, 2 Q3 ,4 (2SK937-Y5-AA) (2SK937-Y5-AA) DUP RX SIMP RX CH70 RX CH70 RX AF (0dBm 600 Ω) CH70 RX (05P0675) U30-2/4 U29 U2 (VHF) U3 (DSC) CPU CPU MODEM U31-2/4 PIO CONTROL (05P0616A) (H8 : HD6475328CP) (V25: µPD70320GJ) (NJM3403AV) U14 (µPD71055GB) CH70 1200 FM-8700 DX-8700 TR ANT (2SC3123) (MSM6927GS-2K) TP1
Fig.1-6 CH-70 Receiving Signal Flow
The receiver for CH70 (156.525 MHz) is included in DX-8700.
CH70 signal is received by either of a dedicated receiving antenna (CH70 RX ANT) or a transmitting-receiving antenna (TR ANT). The internal circuit connection must be
changed in accordance with the equipped antenna.
The input signal from TR ANT (SIMP RX) is amplified by Q1 and Q2 (preamplifiers) so as to adjust it to the same level as the input from CH70 RX ANT.
The gain from Q1, 2 to J5 is more than 0 dB.
The input signal to CH70 RX circuit is amplified by Q11, passed through FL1 (156.525 MHz), mixed with the 139.625MHz local oscillator output in U3, and converted to the first IF signal of 16.9 MHz. Then, after passing through Q12, FL2, and Q3, the signal is converted to the second IF signal of 455 kHz by mixing with the 16.9MHz second local oscillator output, and input to CONTROL board in the main unit as CH70 RX AF signal. This signal (VHF DSC signal) is decoded in the CONTROL board.
3. Transmitter section Transmitting AF circuit U30-1/4 (DSC MSG) CONTROL PCB (05P0616A) Wing - MIC MOD (-26dBm 600 Ω) R154 R155 R156 R153 MIC MODEM REMOTE T1 R127 C D JP2 LINE MON MIC SELECT W HS HS DSC REMOTE MODEM U 29 VHF CPU U 2 DSC CPU U 3 CONTROL. etc TX PCB (05P0618A) MOD IN RX PCB (05P0672) LINE MON J408-5 J404-7/8 FILTER PCB (05P0637) Wing - MIC MIC REMOTE -46dBm 0dBm 0dBm (-46dBm) U30-3/4 U32-1/4 U32-3/4 U32-4/4 U32-2/4 U31-4/4 J406-3/4 J406-9/8 J407-1/2 (600 Ω) Note) Note) Operational Priority: 1. DSC call 2. Wing handset 3. FM-8700 4. REMOTE (RB-700) (600 Ω) • 0dBm: Carbon Microphone (40Ω) • -46dBm: Dynamic Microphone (600Ω)
Fig.1-7 AF Signal in Transmitter
Audio signals from the wing handset, remote station (RB-700), and handset of the main unit are input to CONTROL board through FILTER board.
Either carbon microphone or dynamic microphone can be used for the wing handset. When a microphone is installed, the jumper wire JP2 is set in accordance with the specification of the microphone.
Transmitter VHF DSC messages are converted to AFSK (1700 ± 400 Hz) by U29 (MODEM).
The audio signals and the AFSK signal are sent to TX board as <MOD IN> signal through analog switches in U32, R132 – 135, and U30.
1-12 Transmitting circuit VCO Pre-Emphasis MIC R79 R78, C96 U6-1/4 Limitter U6-2/4 (LPF) U6-3, 4/4 MOD R64 PLL U5 (PLL2001S) Q5/6 Q 7 Q1/2 Drive PA M57710A Power DET LPF U1 U2-1/2, CR6 PWR DET PWR CONT Q3, U2/7 PWR CONT CR11 (UNLOCK -- OFF) Y1: 8.000MHz C76 TX PLL Frq. DATA MOD IN (-26dBm 600 Ω) J101-1/2 TX OUT U2: CPU A/D D/A TX PLL Frq. DATA
(To TX PCB) (SCK, SDA, LE)
TX PLL LOCK DET J102-1 J102-1/3 (SCK, SDA, LE) J102-5 TX PLL LOCK DET J102-6/7/8 TX PCB (05P0618A) (To DX-8700) From CONTROL PCB From CONTROL PCB From CONTROL PCB (To CONTROL PCB) PLL FIL CONTROL PCB (05P0616A) LD FIN
Fig.1-8 Transmitter Circuit
AF signal from CONTROL board, <MOD IN> signal, passes through R79 (MIC), pre-emphasis (R78, C96), limiter, LPF, and R64 (MOD), then inputs to VCO.
R79 (MIC) adjusts the frequency deviation to ±3 kHz with a rated microphone input of -46 dBm.
R64 (MOD) adjusts the maximum frequency deviation to ±5 kHz or less for an excessive microphone input of –26 dBm.
The PLL circuit, consisting of U5, PLL FIL, and VCO (8 MHz reference oscillator) can deliver an output every 25 kHz step in a frequency range from 155.500 to 161.475 MHz. C76 adjusts the transmitting frequency deviation to ±300 Hz. (The specification is
±10ppm.)
The AF signal is frequency-modulated (reactance modulation: G3E, G2B) by applying the signal to a variable capacitor diode in VCO. CR11, unlock detector of the PLL circuit, illuminates when the circuit is operating normally.
The output from the VCO is amplified by Q5, Q6, Q1, Q2, and a power module
(M57710A) in U1 to approximately 25 W. The amplified signal then passes through LPF and comes out as the transmitting output from the main unit.
To control the transmitting power, a <PWR DET> signal is generated by detecting the transmitting output and sent to CONTROL board. There, the signal is processed by VHF CPU to <POW CONT> signal, which controls the output of power module U1.
The transmitting output power is adjusted in power adjustment mode with six waves – CH60, 14, 88 of DUP and SIMP waves – and the respective power data is stored in the memory.
4. Receiver section Receiving circuit OSC DET Q1 U1 Q2 FL1 21.4MHz Q3 Y1 20.945MHz FL2 455kHz U2 (MC3361CD) U4 8.000MHz Y2 Fr-21.4MHz (3SK302GR) (GN2011) (2SK937-Y5-AA) (3SK302GR) (NJM4558M) VCO Q6 C95 TP2 J9 RX (05P0672) (2SC3123) PLL U10 (PLL2001S) LOOP FIL Q4/5 FIN CR2 RX PLL Frq. DATA (SCK, SDA, LE) RX PLL LOCK DET LD (UNLOCK- OFF) (BPF) (BPF) Noise AMP DET SQ DET LINE R34 A A U8 U5 SQ SIG U6 U7 U7 LINE OUT HS SP VOL OUT LINE MON AF VOL U6 U9: AFP (TDA2003H) SP ON BEEP U11 (M54972P) SP ON TX ON DUP/SIMP MUTE MUTE Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 SDA SCK RXA LINE MON RX PLL LOCK DET SCK, SDA, LE CONTROL (05P0616A) EXT SP Handset SP SP BEEP BEEP MAX LINE OUT HS SP B B RX IN SQ SIG REMOTE U8 TP3 U3/4 CR1 U8 U8 R48 T2
Fig.1-9 Reciver Circuit
The receiver input signal from DX-8700 is input to J9 of RX board, amplified by Q1, and converted to the first IF signal of 21.4 MHz in U1. CR2, unlock detecter of the PLL circuit, illuminates when the PLL circuit is operating normally.
The first IF signal is passed through FL1 (21.4 MHz) and Q3, and input to U2
(MC3361CD). In U2 the signal is converted to the second IF signal and demodulated. R34 "LINE" adjusts the output from U2 so that the output level from U4 at TP3 becomes 0.2 Vrms when a receiving signal of 60 dBµ with 1 kHz modulation and ∆f of 3 kHz comes in.
<SQ DET> signal from U3 is used for detecting the carrier for SQ control and <SQ SIG> signal from U5 is for detecting the audio signal for SQ control. Both signals are input to CPU for VHF (U2) on CONTROL board. The SQ control is operated by controlling U8 with <MUTE> signal.
References)
• Built-in speaker : 3 W (10% distortion), 8 Ω
• Handset speaker : 2 mW (10% distortion), 200 Ω
• Sensitivity : less than 0 dBµ (20 dB SINAD)
1-14 Receiving AF circuit W-MIC MIC MODEM REMOTE U30-3/4 LINE MON U2 DSC CPU U3 SQ DET RX PLL LOCK DET SCK, SDA, LE BEEP BEEP MAX SQ SIG SQ VOL U30 SQ SET VHF CPU MODEM U29 TX/RX RT1200 CH70 1200 CH70 RX AF LOOP U30-2/4 U30-1/4 LINE MON RX (05P0672) CONTROL (05P0616A) RXA RXA LINE MON CH70 RX (05P0675) MOD IN TX (05P0618A) U31-2/4 U31-1/4 U31-4/4 (T/RD 05) R1 U31-3/4 U32-3/4 DSC
Fig.1-10 AF Signal in Receiver
AF signal "RXA" from RX board is input to an analog switch U31-2/4 and "CH70 RX AF" signal from CH70 RX board is input to another analog switch U31-3/4.
When <Watch VHF CH70> appears on the DSC display, the control signal "CH70 1200" selects a DSC AF signal from CH70 RX board by switching the U31-2/4 on. When <Watch VHF > appears on the DSC display, the control signal "RT 1200" selects the DSC AF signal from RX board by switching the U31-3/4 on.
"Loop" control signal is used for self-test. Loop test is practiced by detecting MODEM output directly.
Input signals for transmitting modulation, W-MIC, MIC, MODEM, and REMOTE, are input to U31-4/4. The "LINE MON" signal that controls this switch is set by "RT4- TX AF monitor" in "setting RT" on Page 3-6. Turning on the switch can monitor each
transmitting input signal line and check which signal is coming in. However, note that the "MIC" (HANDSET) input line from the main unit microphone cannot be monitored.
Remarks) Receiving AF input signal for DSC is selected by "DSC setup". • CH70 selection → <Watch VHF CH70> display
5. Controller section SIO SIO P2 PT Adress Decode
ROM EEROM S-RAM Backup Control AVR Reset Control P2 P1 P0 SIO SIO NOR 1/13 Latch P0 P1 P2 P1 P4 P3 P5 P6 P8 P9 P7 MODEM µPD70320GJ (V25) µPD771055GB (PIO) HD6475328CP (H8) MSM6927GS MBM89371A (SIO) U2 U3 U4 M27C40001 µPD43256BGU U8 U5 AT28C64A U20 SI-8031L M51953L U19 RESET 15V 5V Control BUS Adress BUS Data BUS RESET CLK IRQ0 RESET 8MHz CLK 16MHz CLK OUT 8MHz CLK DMC NMEA
MIF (Serial Printer) T/R 0 T/R 1 Dimmer Contrast Key Scan Key In S1 NMI Beep/Beep Control Alarm LED DSC Recive Data 74HC4078AF U13 74HC193AF U12 U10 U14 U11 74HC245AF 74HC02AF : FU15 74HC138AF : FU1, 6, 7 74HC42AF : FU9 T/RD02 T/R Control Data T/R State Data T/R LED Data LCD Data LCD Control
T/R LED CH-Data Latch T/R Key In Modulation Line Select
Modulation Line Moni
ON Hook TX PLL Data TEMP Power DET (TX) SQ DET SQ set PTT (HS, W-HS, TX Key) POW (DX-8700) Y1 15.9744MHz C2 MIF (RB-700) (T/RD04) SQ Sig Input Beep Out (T/RD05) TX Power Control RX Control Data (PLL, etc)
U29 AIN SGI RESET Q18/19 (BT1) (VHF CPU) (DSC CPU) 7.9872MHz TP-1 NMI SW INTR1, 2
Fig.1-11 Controllor Circuit
To clear the contents of EEROM and S-RAM for DSC , press [S1 : NM1] while keeping power on; turn the power off, and on again; then <NO RAM EEROM ALL> will be displayed; and select an object item and press [ENT] key. (Refer to section 5.5 for more details.)
The oscillator frequency of Y1 (15.9744 MHz) connected to U2 (VHF CPU) determines the communicating speed of DSC (1200BPS). To adjust the frequency, turn on power while pressing [CH16] key, then adjust C2 so that the frequency at TP1 becomes 7.9827 MHz ± 30ppm.
1-16 Panel (LCM-523-68HE-4)LCD DATA (8bit) CONT (2bit) CONTRAST (Vo) DIMMER (DIM 5VB) DSC ALM LED ALM LED CONT (3bit) Key Scan KEY IN (5bit) VHF LED×7 Latch (TC74HC573AF) × 4 Latch
LED ON DATA (8bit) CH Indicator (7seg. LED × 3) 5V VHF KEY BOARD Key In (DB1-8, RS, R/W) LED LE 0 LED LE 1 LED LE 2 LED LE 3 (LED D0-7) • REM • USA • WX • PRIV • TX • LOW • SP 1 2 3 CAN -CEL 4 5 6 DIM 7 8 9 SELC < 0 > ENT ALM CALL DIST KS 0 KS 1 KS 2 KS 3
KIN 0 KIN 1 KIN 2 KIN 3 KIN 4
ALM 0 ALM 1 ALM 2 CH16 HI/LOW SP ON/OFF SQ AUTO SCAN/DW/OFF DIMMER (DIM 5V) DIMMER (DIM 5VA)
DSC KEY BOARD
Output power control
The output power of PA (U1) is picked up by the power detector CR6 and U2, and applied to the comparator through the A/D converter. The comparator compares the output power of the PA with power data stored on the EEROM U8. The comparator output signal is applied to the PA as power control signal through the U/D counter and the D/A converter. Thus, the PA output power is controlled until the programmed output power is obtained.
Programming of the output power is carried out by rotating the CH knob in the power adjustment mode. The power is programmed when the PTT switch is released.
The power adjustment is made on six frequencies, CH14, CH60 and CH88 in both simplex and duplex modes. Using two data among those data, the power data for other channels is determined.
TEMP and POW signals
Temperature signal "TEMP" is applied from POWER board to U2 on the CONTROL board through RX board. When the temperature becomes 70 to 80 degrees, the power data from EEROM U8 is compensated by the TEMP signal and the output power is reduced to a minimum of 10 W depending on the temperature detected.
The power signal "POW" from the DX-8700 monitors T/R antenna power. During self-test, TRANSMIT POWER: NG appears if TX output power is less than 15W.
DET U2, 7, Q3 U1: M57710A PA #2 15V #3 #4 #1 0.1~0.2W (PG≥21.5dB) 10bit A/D 8bit D/A COMP U/D Counter TX OUT (25W) CR6, U2 POW DET (0 - 5.0VDC) POW DET POW CONT TX (05P0618) EEROM U8 U2
Power Data Write Power Data Read
CONTROL (05P0616) DX-8700 POW POW DET TEMP t C° RT1101 RX PCB (05P0672) POWER PCB (05P0617) U3 CH KNOB
Power Data Display (000~999)
CPU
Power ADJ
-TSENCE
1-18 Self-test
Self-test is made in the following process. The test includes receiver circuit test and AF loop back test. In the receiver test, CH70 RX and RX boards receive leakage of TX PLL modulated DSC signal. In the loop back test, the MODEM output is fed back to the MODEM input on the CONTROL board.
Start Start CH70 RX AF supplied to MODEM (CH70 1200) V25: DSC CPU H8: VHF CPU Command Transfer
LOOP BACK TEST
End command transfer
End Receiving
End command transfer
Status display Reading and decoding
status error information
PLL UN-LOCK? CH70 RX AF supplied to MODEM? (CH70 1200) RX A supplied to MODEM (RT1200)
MODEM output fed back to input (Loop)
Command
transfer Start
LOOP BACK TEST
End command transfer
End
Status display Receiving
End command transfer
Reading and decoding status error information
End Result display
Reset status
Start
MODEM selected for TX (MOD IN) line
TX/RX PLL set to CH70
PLL UN-LOCK?
Un-lock flag set
Flag set for loop back test result
Result deta set
End Loop back test
(No TX during test)
Note) RX PCB and CH70 RX receive leakage of PLL RF signal Preparation for receiving
leakage of TX PLL RF signal by RX PCB YES NO (LOCK) YES NO
Preparation for receiving leakage of TX PLL RF signal by RX PCB
YES
NO (LOCK)
MODEM output connected to MODEM input
3 AF LOOP BACK TEST 1 CH70 RX PCB TEST
2 RX PCB TEST
(DSC modulation)
(See note.)
6. Power supply section Line Filter REG U2 Q2, 3 , 4 RL CONT Over /Low Volt Protect CB1: 10A POWER SW 24V Q1 U1 Filter PCB (05P0673) Power PCB (05P0617) Line Filter TX PCB J604-6 15V J602-6 REMOTE: RB-700 Wing Handset: DX-8700 J610-1/2 J304-3/4 J303-1/2 J107-1/2 CONTROL PCB J411-2 J304-1 RX PCB J304-7 J304-8 J208-1 J206-1 RX PCB J301-1/2 J302-1 J302-2 J609-1/2 MB3761PF RX PCB (05P0672) REG U12 TX ON TX 8V FIX 8V REG U4 TX PCB (05P0618A) J107-1/2 µPC78L05T 15V (PA) 5V J204-1 J204-3 J103-1 J103-3 J208-1 J206-1 U9 AFP AN7809F REG U13 AN78L05M 5V SW Q14 CONTROL PCB (05P0616A) REG REG U20 U18 12V AN78L12M SI-8031L J411-2 5V to A to B to C to D B C D A Filter PCB (05P0673) J207-3 TX
(To Wing Handset)
TX J603-3 TX 15V 15V J602-5 See note. K1 Note)
(1) Overvoltage protector: activated by 32 VDC (2) Lowvoltage protector: activated by 20 VDC
1-20 7. IF-8500 (Printer interface)
Serial printer data from the FM-8500/8700 is sent to the printer interface IF-8500 where MIF data or Furuno radio interface data is converted into parallel centronics data.
The output of the interface is connected to the printer PP-510.
Further, MF/HF terminal DSC-5/6, NBDP terminal DP-5/6, and No.2 VHF DSC (FM-8500/8700) can be connected to the IF-8500 which outputs the data on a first-in first-out basis.
No.1 FM-8500 /8700
(Signal and Line conversion) Parallel data Adhering to Centronics (5 m MAX) Serial data Parallel data NBDP (DP-5/6) power supplyDC24 V (50 m MAX) (50 m MAX) (5 m MAX) (5 m MAX) IF-8500 DSC (DSC-5/6) No.2 FM-8500 /8700 PP-510 Serial data Parallel data
Fig.1-16 Connection of IF-8500
U1 (ROM/ RAM/ SIO) U8 Photo Coupler U9 Photo Coupler REG U11 SW REG U10 12V DC24V 5V Y1 9.2 MHz U6 U3 U4 BUFFER DSC (DSC-5/6) NBDP (DP-5/6) PP-510 BUFFER BUFFER (HD647180XOFS8L) (TA78DL12) (CBM-1205SF) CB1 (1A) CR3 (V06C) TXD TXD RXD RXD IF-8500 No.1 VHF DSC FM-8500/8700 No.2 VHF DSC FM-8500/8700 DATA DATA DATA Q1 Q2 CR10
Series connection of IF-8500
When DSC-8VP, DSC-5V, and FM-7500, which output printer data in parallel format, is connected to the IF-8500 together with DSC-5/6 and/or NBDP, the two IF-8500 must be used as below. The jumper setting must be changed.
J1 JP1 JP2 JP3 CB1 CPU Board Put jumper. not used Parallel data No.1 VHF DSC (ex. DSC-8VP) No.2 VHF DSC (ex. DSC-8VP) (JP3: Short) IF-8500 PP-510 IF-8500 (JP3:open) DSC port: J5 or NBDP port: J3 Serial port: TB-1 3-6 or Serial port: TB-1 7-10 Serial data Serial port: TB-1 3-6 or Serial port: TB-1 7-10 NBDP DSC-5/6 Parallel data
Fig.1-18 Series Connection of IF-8500
Setting of JP3 in IF-8500
JP3 Input Output
Port Data Port Data
J3 (NBDP) Parallel J5 (MF/HF DSC) Parallel Open (default) TB-1 (No.1/2 VHF) Serial J4 (PRINTER) Parallel J3 (NBDP) Short
2-1 1. Control Panel For DSC For VHF 2. Rear Panel HANDSET WING HANDSET PRINTER DMC NMEA GND POWER TX ANT EXT SP REMOTE BREAKER RX ANT
3. Bottom View, Cover removed
Loosen these screws to detach the panel
TX/RX/POWER Boards under the cover
CONTROL Board (05P0616A) 4. CONTROL Board CPU for VHF (U2 : HD6425238CP/H8) TP-1 CH16 + PWR ON : 7,9872MHz±30PPM (C2 ADJ) S1 NMI SW CPU for DSC (U3 : UPD70320/V25) JP-1 (BATT ON/OFF) ROM for DSC (U4 : M27C4001) EE-ROM (U8 : AT28C64) ROM BACK-UP (BT-1) I/O (U12 : MBM89371A) JP3/4 JP2 MIC SELECT MODEM (U29 : MSM6927GS) C2
2-3 5. Bottom View
(CONTROL Board and the cover removed)
FIL Board (05P0673)
PA
(U1 : M57710A) TX Board (05P0618A)
R79 MIC R64 MOD CR11 (TX PLL UN-LOCK Detector) C76 TX Frq TX VCO CR2 (RX PLL UN-LOCK Detector) C95 RX Frq (F-21.4MHz±10PPM) RX Board (05P0672) RX VCO POWER Board (05P0672) 6. Panel PANEL Board (05P0615)
7. Duplexer (DX-8700) C73 (156.525 to 16.9 MHz ±10PPM at TP1) CH70 RX Board TP1 J6: CH70 IN J1: D RX RX OUT NMEA CH70 RX ANT ANT J4: ANT WING HANDSET TX IN TP2 (16.445 MHz CHK) J2: D ANT J11 J10 C23 TB-1 J5: CH70 OUT C14 J3: D TX Duplexer
3-1
3.1 Outline of system setting
The following operations shall be executed only by the dealers and agents that FURUNO has approved. Those dealers and agents shall conduct the following system setting under their responsibility. It is strictly prohibited to disclose this information to the operators and possessors of the machine, because immoderate changes of the system setting will cause performance variation of the apparatus.
Precautions
The system setting will be executed when the machine is installed. However, when the system setting change is required because of unit exchange or other reasons, follow the procedures described on the following pages.
Contents of system setting
Confirmation of the ID number of the own ship
(How to change the ID number is described on Page 3-15).
Selection of receiver section (VHF receiver or CH70 receiver) and ON/OFF setting of DMC connection
Pre-settings in VHF section (1) Selection of USA/WX mode
(2) Confirmation of Private mode (How to change the mode is described on Page 3-15).
(3) Auto-revert function
(4) Automatic ON/OFF setting of internal speaker (5) Restriction on continuous transmission time (6) Monitoring of sending sound
(7) Automatic 1W function (8) Dual watching
(9) Scanning
(10) Setting of audio squelch range Channel pre-setting of each mode
Setting of transmitting power (Maximum power and reduced power) LCD display selection between Japanese and English
DSC section VHF section 1 2 3 4 5
3.2 Change operation to normal mode or test mode
Change of the system setting, except " Input of ID number of the own ship", is executed after changing from normal mode to test mode in the following procedures. The normal mode means the state in which <Watch VHF> is displayed on the LCD screen of DSC and the test mode means the state where <TEST VHF> is displayed.
Procedures
Protection OFF
1. In the normal screen, press SELECT key first and 9 key next. Then this display will appear.
V P ID DSC RT CH PO L
Blinking
Display 1
2. Put the cursor on "P" by using key and press ENT key. * System protected *
3. Input password (secret code).
Protection < > ON OFF
6 5 2 1 1 1
4. Put the cursor on "OFF" by using key and press ENT key. Now, DSC, RT, CH, PO, and L can be changed.
V P ID DSC RT CH PO L
Power adjustment (p.3-10) Display 1
Channel preset (p.3-8) Preset of VHF (p.3-6)
Display mode selection (p.3-12)
3 4
5 6
3-3
Protection ON
After changing the system setting of DSC, RT, CH, and PO, return to the normal mode in the following procedures.
To close the display for setting, press CANCEL key several times.
Test
How to return to the normal mode (Watch display)
Test V P ID ---Protection < > ON OFF SELECT 9 ENT ENT
Select "P" by pressing key, then press key.
Select "ON" by pressing key, then press key.
Press key twice to return to the watch display.CANCEL
After changing system setting, be sure to return from <TEST> mode to the normal mode of <Watch> display.
3.3 Change of system setting
[About the rules for key operation]
In the selection menu as follows, two methods are available to choose one item. One is to select an item by using the arrow key and press ENT key. The other is simply
to press the number key corresponding to the required item.
CH70[1] VHF[2] Selectionmenu DSC: Receiver
(Example)
Selection method
• Put the cursor on the required item with the arrow key and press ENT key.
• Or, press the required number key, 1 or 2.
1. Setting DSC (Selection of receiver)
V P ID DSC
---ENT
At the display 2 (shown above), press key. Select "DSC" on the display 1.
CH70[1] VHF[2] DSC: Receiver
ENT
Select either one with the arrow keys followed by key, or by pressing the corresponding numeric key.
(Continued on next page)
Display 2
CH70 DSC CH70 receiver used VHF VHF receiver used
Note : Normally select "CH70" for DSC continuous watch. If two FM-8500 are installed for duplication, select this setting as follows :
Main (No.1) FM-8500 "CH70" Sub (No.2) FM-8500 "VHF"
When No.1 FM-8500 fails, use No.2 FM-8500 after interchanging these settings.
3-5
V P ID DSC RT CH PO L Display 3
(From previous page)
ON[1] OFF[2] DSC: remote DMC
ENT
Place the cursor on a desired item with arrow keys, then press key. Or, press corresponding numeric key (1 or 2).
2. Setting RT (Function of VHF section)
Refer to the next page for the factory default value.
RT1- Mode: USA/WX < > OFF[1] ON[2] After selection RT1- Mode: private < > protected <OFF> After selection RT2- Hook work: CH16 < > ON[1] OFF[2] After selection RT2- Hook work: SP < >
ON[1] OFF[2] Automatic internal speaker setting (on/off)according to handset status as below.
After selection
Auto revert function
(Automatic setting of CH16 on ON HOOK status)
Selection of USA/Weather modes Function
Selection of Private mode
"Protected"
Handset Speaker ON HOOK on OFF HOOK off
RT3- Time out timer < >
OFF[1] ON[2] ON: 5 minutes
OFF: no limitation
After selection
RT4- TX AF monitor < > OFF[1] ON[2]
After selection
Tx AF monitor from DSC, Handset, Wing Mic or remote station. Continuous transmission time limit
To INT SP To RB-700 (line-out)
(Continued on next page)
DSC Wing Mic Handset RB-700 To Tx line Tx AF monitor ON/OFF command from CPU ON: Enable OFF: Disable ON: Enable OFF: Disable ON: Enable OFF: Disable ON: Enable OFF: Disable
3-7 RT5- Auto 1W < > ON[1] OFF[2] After selection RT6- Dual Watch < > ON[1] OFF[2] After selection RT6- Scanning < > ON[1] OFF[2] After selection RT7- Auto SQ < >
LOW= HIGH HOLD Audio squelch (voice detectingtype SQ) range setting
Scan operation
Auto 1W (Power is automatically reduced to 1W when the low output power channel is selected.)
Function
Dual watch operation
LOW : Lower limit of voice freq. HIGH : Upper limit of voice freq. HOLD: SQ hold time
(SQ open time after signal goes away.)
(From previous page)
Display 4
(Setting value) x 20 = ms
Enter 2-digit data for lower limit followed by key. Then enter "HIGH" and "HOLD" data in the same manner as "LOW".
ENT (Setting value) x 50 = Hz V P ID DSC RT CH PO L ON: Enable OFF: Disable Default settings Delivery RT1 Mode: USA/WX RT1 Mode: PRIV RT2 Hook work: CH16 RT2 Hook work: SP RT3 RT4 RT5 RT6 DW RT6 SCAN
Standard OFF OFF ON ON OFF OFF ON ON ON
USA ON OFF ON ON ON OFF ON ON ON
3. Setting CH (Channel presetting)
Transmission/reception mode, communication mode, and output power can be selected as follows.
In the display 4 on the previous page, press ENT key.
INTL CH: XX < > ENABLE= TX[1] RX[2] UN[3]
Select a desired channel mode and a channel with the channel knob. (Refer to right figure)
INTL CH: 20 < > ENABLE= TX[1] RX[2] UN[3]
After selection
INTL CH: 20 < > TELECOM= SIMP[1] DUP[2]
After selection
TX : Both transmission and reception available. RX : Reception only available
UN : Unable (Neither transimission nor reception available)
(Continued on next page)
(Example) An example when CH20 of INTL (International channel) is selected. (Refer to the next page when the private mode (PRIV) is selected.)
This shows the preset seting status on INTL CH20.
SIMP : Simplex DUP : Semi-duplex
USA WX PRIV
Every one pressing the channel knob
successively changes the channel mode as follows.
LEDs
CHANNEL Knob
INTL USA WX PRIV (No LED)
Then, set to the desired channel by turning the channel knob.
3-9 INTL CH: 20 < >
TX POWER= HIGH[1] LOW[2]
After selection
INTL CH: 20 < >
(From previous page)
Setting on INTL CH20 can be checked. HIGH : 25W
LOW : 1W
Output power selection
INTL CH20 has been preset.
ENABLE= TX[1] RX[2] UN[3]
An example when the private mode is selected.
P01/CH : XXX < > PRIV No. SELECT: [<][>]key
P02/CH : 100 < >
(Example) Memory No: 02, CH: 100
Set every item successively in the same manner as an example
when CH20 of INTL (International channel) is selected. on the previous page.
After presetting all the channel mode, exit from the channel preset menu by pressing key.
ENABLE= TX[1] RX[2] UN[3]
Memory No.
Select a desired memory number (maximum: 20) with the arrow key and press key. Then, select a channel to preset by turning the channel knob.
(Refer to the appendix 2 for the channel list.)
ENT
CANCEL
Display 5
4. Setting PO (Setting transmitting power)
In the display 5 on the previous page, press key (Selection of "PO"), then press ENT key.
DUP Pow- CH60 <HI:XX>
SELECT [MODE][CH][H/L]SW High power adjustment on INTL CH60
Set on CH14, CH60, and CH88. To compensate a power loss in the duplexer, set the maximum power and reduced power in "DUP" and "SIMP" modes on these channels as follows.
The channel to set power, DUP/SIMP mode, and the power setting value (power data) are displayed.
• The case of CH60 in DUP and SIMP modes
Set the maximum transmitting power (power data) by turning the channel knob while pressing PTT switch. Releasing the PTT switch at the desired value fixes the value. (Power data: 800 ± 100 → Transmitting power of approximately 25 W) --- Refer to the next page for the power data.
Next, press HIGH/LOW key, then this display will appear.
DUP Pow- CH60 <low:XX>
SELECT [MODE][CH][H/L]SW Low power adjustment on INTL CH60
Set the reduced power (power data) in the same way as above.
• The case of CH14/CH88 in DUP and SIMP modes
Set the channel to CH14 (or CH88) in DUP or SIMP mode by turning the channel knob.
SIMP Pow- CH14 <HI:XX>
SELECT [MODE][CH][H/L]SW High power adjustment on INTL CH14(or CH88)
Set both the maximum and reduced power in the same way as the case of CH60.
After setting the powers in DUP and SIMP modes, set powers in the private mode. In the private mode powers can be set in every channel independently.
3-11
To change to the private mode, press [CH16] key while pressing and holding down the channel knob. To change the private channel, turn the channel knob.
TX Power:Priv01< > SELECT:[MODE][CH][H/L]SW
PRIV mode
After the completion of power adjustment on all modes, press CANCEL key.
(Continued on next page)
5. Setting L (Selection of LCD display, Japanese or English)
For the transmitting/receiving message display in DSC and menu display, Japanese (katakana) or English is select.
LCD language < > E[1] J[2]
ON OFF
(From previous page)
Select "P", then press key.
Select "ON", then press key.
To return to the normal display, press key several times. After selection Press key. Protection < > ENT ENT ENT Language Selection E: English J: Japanese V P --- PO L CANCEL
3-13
3.4 Change of jumper setting
Setting wing handset type
Change the setting of a jumper plug JP2 on CONTROL board in accordance with the type of wing handset. Whichever, "D" or "C", is selected, adjusting R127 is not required.
D C
C D
R127
For Carbon MIC (Default)
C
D For Dynamic MIC
Ni-cd Battery
JP2 (Jumper Plug)
Top view of CONTROL Board or
Setting on common or respective use of antennas
If an antenna is commonly used for both VHF and CH70, or if two individual antennas are used for VHF and CH70, wirings in DX-8700 must be changed.
• Use of one antenna commonly for VHF and CH70;
Connect J5 CH70 OUT and J6 CH70 IN with a coaxial cable with mini-pins.
• Use of two antennas respectively for VHF and CH70;
Connect the coaxial cable with mini-pin from "CH70 RX ANT" connector to J6 CH70 IN . TB1 D RX ANT D ANT D TX J10 J2 J4 J3 J11 J5 J1 J6 (CH70 IN) (CH70 OUT) RX OUT TX IN ANT CH70 RX ANT Duplexer CH70 RX Board
3.5 Confirmation of ID number
Procedure
1. In the normal display, press SELECT key first and 9 key next. Then this display will appear.
V P ID DSC RT CH PO L
Blinking
2. Put the cursor on "ID" by pressing key and press ENT key.
V P ID DSC RT CH PO L
3. Confirm the ID number of the own ship. (MMSI : Maritime Mobile Ship Identity)
* Own identification * Protected MMSI: X1~X9
Own ship ID
4. After the confirmation, return to the normal display by pressing CANCEL key
3-15
3.6 Changing ID number and ON/OFF of Private
mode
Procedures
1. Turn on power and press NMI switch.
Control Board (05P0616A)
Ni-Cd Battery
NMI Switch (S1)
Bottom view of Main Unit, Cover removed
2. Once turn off the power.
3. Turn on the power again, then this display will appear.
Clear < >
NO RAM EEROM ALL
Note that EEROM clear changes the RT : VHF presetting to the default.
4. Select EEROM with the arrow key and press ENT key.
A display "Now WRITING EEROM" will appear, and after about 15 seconds another display "Turn off the power" will appear. Then, turn off the power. 5. Turn on the power again, then this display will appear.
TEST VHF ch70
manual
Test mode
6. Press SELECT key first and 9 key next, then this display will appear.
V P ID DSC RT CH PO L
Blinking
7. Put the cursor on "ID" by pressing key and press ENT key.
Enter own indentification [digits] MMSI= Maritime Mobile Ship Identity MMSI = Entry of ID
8. Input the ID number of the own ship with nine digits, check to be sure about the input number, and press ENT key. (When a wrong number is input, press
CANCEL key and re-input the correct number.)
V P ID DSC
---9. Put the cursor on "RT" and press ENT key twice.
OFF[1] ON[2]
RT1- Mode: private < >
Selection
Private mode ON/OFF selection
10. After the selection, return to this display with CANCEL key.
V P ID DSC RT CH PO L
11. Put the cursor on "P", and press ENT key.
Protection < > ON OFF
12. Select "ON", and press ENT key. (Here, by pressing ENT key again, the input
ID number can be confirmed. If the number is incorrect, input the correct number from the first step. )
13. Return to the normal display by pressing CANCEL key several times.
Watch VHF ch70 auto
The ID number to input must be the MMSI number that is allocated to the ship. Again, check that the input number is correct.
4-1
4.1 Transmitting frequency and power
TX Frequency
TX Freq. On CH16 Conditions Adjuster Rated Value 156.8MHz ± 300Hz PTT : ON C76
(TX Board) ±10PPM
Connect a frequency counter as illustrated below, and read the frequency on CH16 with PTT switch ON. DX-8700 Watt meter (50Ω) ANT CH70 RX ANT Dummy load (50Ω) Frequency Counter Make a pick-up coil by winding a wire by four
to six turns like a coil, and connect it to the frequencty countor.
Put the pick-up coil close to the dummy resistor or ANT coaxial cable, and pick up the transmitting frequency.
1 2
If the measured frequency is out of specification, adjust C76 on TX board.
The C76 is a variable capacitor to adjust the reference frequency of the transmitting synthesizer PLL circuit. By adjusting the frequency of only one channel, the transmitting frequencies of all the other channels are adjusted at the same time.
TX Board
Control Board Hole for C76 adjustment
Bottom View Cover removed
Transmitting power
For adjusting transmitting power, refer to setting "PO" in Section 3 "System setting" on Page 3-10.
• Default power (factory setting): 21-25W (Reduced power specification: 0.7-1W)
Chapter 4. Adjustment and
Measurement
4.2 Measurements on CH70
CH70 is a channel allocated for VHF DSC. Transmission on this channel does not work by depressing the PTT switch on the handset. Measurement of power and frequency on CH70 are made in DSC operation. Tone frequency (mark/space) is also measured in DSC operation.
For these measurements on CH70, DSC operation must be changed from its normal mode (watch display) to test mode (test display).
After the measurements, be sure to return DSC operation to normal mode.
Change DSC mode from WATCH to TEST
Change DSC mode from TEST to WATCH.
Tone
Measurement
CH70
Freq & Power Measurement Key operations on DSC
From "Watch" screen to "TEST" screen (Protection : OFF)
SELECT →
CH70: 156.525MHz±300Hz
From "TEST" screen to "Watch" screen (protection:ON)
Mark : 1300±10Hz Space : 2100±10Hz
Remarks)
1. Tone frequency (mark/space) cannot be adjusted.
If the frequency is out of ±10 Hz of the specification, Y3 (3.58 MHz) on CONTROL board is faulty.
2. For adjusting power of CH70, refer to "setting PO" in Section 3 "System setting" on Page 3-10.
4-3 1. Mode change
Changing to test mode
1. In the normal mode, press the keys - SELECT → 9 → → ENT
-successively.
* System protected *
2. Input a password (secret code) ----> Password: 652111 (These digits are not shown on the display.)
Protection < > ON OFF
3. Select "OFF", and press ENT key.----> This leads to test mode.
4. Change the display to test mode by pressing CANCEL key several times. ("TEST" flashes.)
5. Measure the tone (mark/space), power, and frequency of CH70.
→ → “TONE” selection (Refer to the next page for this measurements.)
SELECT
Returning to the normal mode
6. Successively press the keys - SELECT → 9 → → ENT .
Protection < > ON OFF
7. Select "ON", and press ENT key. --- This leads to the normal mode.
8. Return to the normal display ("Watch" display) by pressing CANCEL key several times.
Outputting mark/space signal.
Preparation) For measuring tone signal, connect a frequency counter to the external speaker terminal (EXT terminal) on the rear panel of FM-8700. (EXT speaker load: 4 Ω or 8 Ω) Set the audio volume at an appropriate level. 1. Set the VHF channel to "CH70" (Turn the channel knob). Next, press HIGH/LOW key
to make transmitting power LOW. ("LOW" illuminates.) --->This prevents transmitting power from being induced to the counter.
2. Press keys: SELECT → .
TONE DIST-CH
3. Press ENT key, then this display will appear.
CR MARK SPACE …
4. Select "MARK" (mark) and press ENT key, then this display will appear.
Now doing
5. To output the mark signal, depress the PTT switch on the handset. (If the speaker is on, the mark tone can be heard.)
6. Confirm that the mark signal frequency is within the specification (1300 ± 10 Hz). 7. Press ENT key to stop the mark signal output.
CR MARK SPACE …
8. After confirming the cursor is on "SPACE", press ENT key. 9. Press the PTT switch on the handset to output the space signal.
10. Confirm that the space signal frequency is within the specification (2100 ± 10 Hz). 11. Press ENT key to stop the mark signal output.
12. Change the display to test mode by pressing CANCEL key several times. 13. Return from the test mode to the normal mode ("Watch" display).
4-5
Outputting the transmitting carrier of CH70 (Measurement of the power and frequency) Preparation) For the measurement, connect the measuring instruments in the same
manner as shown on Page 4-1.
1. Set the VHF channel to "CH70". (Turn the channel knob.)
When measuring "Reduced power", set to "LOW" with HIGH/LOW key.
2. Press the keys: SELECT →
TONE DIST-CH
3. Press ENT key, then this display will appear.
CR MARK SPACE …
4. Select "CR" (carrier), and press ENT key, then this display will appear.
Now doing
5. Press the PTT switch on the handset to output the carrier.
6. Measure the power (25 W) and frequency deviation (±300 Hz) of CH70 (156.525 MHz).
7. Press ENT key to stop carrier output.
8. Change the display to test mode by pressing CANCEL key several times. 9. Return from the test mode to the normal mode ("Watch" display).
4.3 Other measurements
1. Confirmation of receiver sensitivity
For simplicity, measure the 20dB NQL (Noise suppression limit sensitivity).
Preparation
Connect the measuring instruments as follows.
RX ANT EXT SP SSG (FM) Low-frequency Watt meter FM-8700 50Ω 24V FM-8700 Settings : CH16, SQ OFF, Adequate Volume 4Ω, 3W, SP or, 4Ω, (3W) Dummy Load Measurement
1. Output from SSG the signal of about 0 dBuV, frequency of 156.8 MHz, modulating frequency of 1 kHz, and frequency deviation of 3.0 kHz, and confirm that this signal can be received.
2. Turn the SSG modulation off and switch the SSG output off.
3. Measure the noise level from the speaker with a low frequency voltmeter and adjust it to 0.5 Vrms by turning the audio volume.
4. Input the unmodulated signal from SSG.
5. While varying the SSG output, search for such an output level as the noise output level is decreased by 20 dB (0.05 Vrms). If the level is less than 0 dBuV, the sensitivity is good.
Remark) No volumes or no other parts on the PC-boards are used for adjusting the sensitivity. Do not arbitrarily adjust any parts or transformers on the boards.
4-7
2. Confirmation of transmitting modulation degree
Preparation
Connect the measuring instruments as follows.
TX ANT MIC Low-frequency SG (AF OSC) ATT. FM-8700 600Ω 50Ω Coupler FM Linear Detector 50Ω Wattmeter 50Ω 50Ω 24V Settings : CH16, MAX Power PTT Switch 1kHz output Measurement
1. Set the AF OSC output to -46 dBm; 1kHz. 2. Transmit FM-8700 with PTT switch on.
3. Adjust the coupler and FM linear detector, and measure the frequency deviation. The specification: 2.4 - 3.8 kHz
4. To check the maximum frequency deviation, adjust the AF OSC output so that the frequency deviation becomes 3 kHz.
5. Check to be sure that the maximum frequency deviation is less than 5 kHz when the AF OSC output level is increased by +20 dBm from the adjusted value above.
Reference) These adjustments are made by the potentiometers, R79 (MIC) and R64 (MOD) on TX board. Do not adjust them arbitrarily. When the adjustments are required, be sure to use calibrated measuring instruments.
Adjusting method
1. Turn R79 (MIC) fully CW (maximum).
2. Measure the maximum frequency deviation by following step. 4 of the above measuring procedure, adjust the volume R64 (MOD), and set the deviation to 4.7 kHz.
3. Set the AF OSC level to -46 dBm, and adjust the frequency deviation to 3 kHz with R79 (MIC).
3. Confirmation of receiving sensitivity of CH70 RX board
In the regular measurement, the error rate in DSC should be measured by inputting DSC message signals on CH70. However, to derive an indication of the sensitivity, the NQL of the CH70 LINE output of CH70 RX board (J8-5, 6) is measured by inputting a signal CH70 (156.525 MHz) from CH70 RX ANT of DX-8700.
Measuring method is same as that described in "1. Confirmation of receiver sensitivity" on Page 4-6. Preparation ANT J8 T.B. CH70 RX ANT Duplexer CH70 RX Board DX-8700 Low-frequency voltmeter (Connected to J8 #5 and #6). SSG (FM) J8-5 : CH70 RX-H 6 : CH70 RX-C
Jumper setting must be checked. See section 3.4 in chapter 3.
Measurement
1. Output the signal from SSG; about 0 dBuV, 156.525 MHz, modulating frequency of 1 kHz, and frequency deviation of 3.0 kHz, and confirm that this signal can be received.
(The receiving sound can be heard by turning TX AF monitor on by the system setting.)
2. Turn the SSG modulation off and switch the SSG output off.
3. Read the CH70 RX level (AF LINE) output on the low frequency voltmeter. 4. Input the unmodulated signal from SSG.
5. While varying the SSG output, search for such a SSG output level as the level read in step. 3 is decreased by 20 dB (1/10). If the level is less than 0dBuV, the sensitivity is good.
Remark) No volumes or no other parts on the PC-boards are used for adjusting the sensitivity. Do not arbitrarily adjust any parts or transformers on the boards.
5-1
In this apparatus a high voltage that may cause shock, burn, or even death is applied. Do not touch inside in case a man has no knowledge of electrical circuits or exact safety measures are not taken.
Warning
5.1 Periodical check
To derive full performance of the apparatus, a periodical maintenance check is indispensable. Do all maintenance checks after turning power off.
1. Cleaning of display portion
The display portion is made of an acrylic board. Wipe dirt off with a soft dry cloth periodically. Never use gasoline, paint thinner, or benzene for the cleaning.
2. Check of loose connectors
Check to be sure that the connectors and earthing terminals of FM-8700 and DX-8700 are tightly fastened. There are many connectors inside the apparatus. At least once half a year check to be sure that those connectors are not loosened by ship vibrations.
3. Antenna
Items Check points Remedies
Whip antenna Is there any cut or water leak at the connector portion ?
Exchange it if the cut is deep.
Coaxial cable Is there any cut on the surface ? Wind a tape round the cut, if any.
5.2 Everyday operational test (Self-test)
Be sure to do operational test everyday to find malfunctions in advance, if any. (Do the test everyday so that a distress message could be transmitted without fail in a distress.)
Watch VHF CH70
• If the PTT switch was pressed once before this test.
Alarm sounds. (Distress alarm check) To silence it, press key.
Please wait ! VHF DSC SELF-TEST
(Normal display)
* Test in progress *
VHF DSC: GOOD
* Completed * Daily test
(Testing) (TEST)
• If the PTT switch was not pressed once before the test.
VHF DSC: GOOD NO TX CHECK * Completed * Daily test
Several seconds later
(Including TX check.)
Returns to normal display.
Press key at the normal display.
3 3
CANCEL
5-3 If "NG" appears
* Completed * Daily test VHF DSC: NG
(Error messages)
Check end: [CANCEL] key
To view reason for NG, press .
Returns to normal display.
CANCEL ENT
Pressing key scrolls the error message displays.
ENT
"NG display"
Six "NG displays" are included in the test. If any error occurred in the test, NG portions can be displayed by pressing ENT key successively as mentioned above.
Either appears.
The transmitting power is less than about 15 W.
CPU for DSC (U3) commands CPU for VHF (U2) to send mark/space signals and the signals are received through the modem (U29). Then, whether the transmit-ted and received signals are the same in level and frequency, or not, is checked.
Check TX board (Power Amp. U1), defective antenna or DX-8700. TRANSMIT POWER: NG
NG display Meanings Remedy
CPU for VHF (U2) detected unlock-ing of the PLL on TX board.
Check PLL (U5) and associated components on TX board.
Replace TX board. Check MODEM (U29) on CONTROL board. Replace CONTROL board.
TX PCB (PLL LOCK): NG
CONTROL PCB: NG
CPU for VHF (U2) sends
mark/space signals to the transmit-ting circuit (excluding the power amplifier). The receiving circuit of CH70 picks up the signals and sends them back to U2. U2 com-pares the received signals with the transmitted signals in level and fre-quency.
Check CH70 RX circuit. Replace VHF RX/CH70 RX board.
CH70RX PCB: NG
The transmitting power output from the duplexer is compared with the transmitting power output from the main unit was compared and a big power loss in the duplexer was detected.
Replace duplexer. DX-8700: NG
CPU for VHF (U2) detected unlocking of the PLL on RX board.
Check PLL (U10) and associated components on RX board.
RX PCB: NG
(AF Loop back test)
(RF Loop back test) U3 U2 Tx Circuit CH70 RX DSC CPU VHF CPU MODEM U2 U29 U31 Picked up Mark/ Space U30
5-5
5.3 Exchanging the nickel-cadmium battery
The nickel-cadmium battery on CONTROL board backs up contents of RAM (all the transmitted/received messages). The life of the battery is approximately five years. (The nominal voltage of the battery is about 3.6 V. If the voltage is more than 3.6 V with power supply off, the battery is normal.) Examine the battery voltage at regular intervals so as not to lose the important data backed-up. When the voltage has dropped, exchange the battery after printing out necessary transmitting/ receiving messages.
If the battery is left for about one month without power supply, the battery will be flat and the RAM contents will be lost. Be careful enough!
Procedure
1. Turn off power. However, if it is desired not to erase RAM contents, unplug the jumper plug JP1 on CONTROL board with keeping power on.
2. Remove the old battery.
3. Set a new battery (Type: N-50SB3, Code no.: 000-835-126) and plug in the JP1 again.
Warning: RAM contents would be erased, if the jumper plug JP1 is unplugged while power supply is off.
Bottom, View, to cover removed Ni-cd
Battery Control Board
5.4 Exchanging ROM
Confirmation of ROM version
1. In the normal display, press keys: SELECT → 9 , then this display will appear.
V P ID DSC RT CH PO L
Blinking
2. Select "V", and press ENT key.
RT:1.xx DSC:1.xx ROM version
Press three times to close the display.
RT: VHF ROM version level DSC: DSC ROM version level CANCEL
Remark) The ROM for DSC is U4 on CONTROL board and the ROM for VHF is contained in the CPU (HD6475328CP (H8/532)) U2 on CONTROL board.
• DSC ROM version 05501-92-10X
• VHF ROM version 05501-93-10X
ROM location
Remove the bottom cover by unscrewing four screws on the bottom of the main unit.
Bottom view, cover removed ROM (U4)
Control Board NMI Switch (S1)
5-7 Setting after exchanging ROM
After exchanging ROM , be sure to clear RAM as follows.
1. Turn on FM-8700. Then, this "Clear display" will appear and "RAM" flashes.
NO RAM EEROM ALL Clear < RAM all area >
Blinking <CLEAR Display>
2. Press ENT key. After a while this message will be displayed on LCD. Then, turn off the power switch of the main unit.
Turn off the power
3. Switch on the power switch again. When this normal display appears, the RAM has been cleared.
auto
watch VHF ch70
5.5 About NMI switch
To clear contents of S-RAM and EEROM, press S1 (NMI switch) on CONTROL board with keeping power supply on. For the location of S1, refer to Page 5-6.
Procedures
1. Turn on power, and press NMI switch. 2. Once turn off the power.
3. Turn on the power again, then this display will appear.
NO RAM EEROM ALL Clear < >
4. Select a desired item by using the arrow key, and press ENT key.
5. If "RAM" is selected, "Turn off the power" will be displayed. Then, turn off the power. If "EEROM" or "ALL" is selected, "NOW WRITING EEROM" will be displayed. About 15 seconds later the display will change to "Turn the power off", then turn off the power.
6. Turn on the power again.
When RAM is cleared: No system resetting required. When ALL or EEROM is cleared:
TEST VHF ch70
Test mode
If required, set the system referring to Chapter 3. After setting the system, be sure to set "Protection menu" to ON and return to the normal mode.
5-9 About "RAM", "EEROM", and "ALL".
Clears all contents of S-RAM (*1). RAM
Purpose Item
Clears all contents of S-RAM and a part of EEROM (*2). EEROM
Clears all contents of S-RAM and EEROM. ALL
(*1) Contents of S-RAM are:
1 All transmitted/received messages
2 Contents set by pressing SELECT key → 1, 2, 4, 6.
(*2) Contents of EEROM are:
1 Contents set by pressing SELECT key → 9.
(System setting data)
2 Contents set by pressing SELECT key → 7.
(Messages in the file: Messages stored in the memory after they are made)
3 Contents set by pressing SELECT key → ALM.
Remarks) The pre-set data of channel (CH) and transmitting power (PO) remain unchanged even after "EEROM" has been cleared. That is, all the other set values are cleared -returned to the factory default values.
6.1 Functional tests
For functional tests (practiced by technicians), change the display to "Test" mode. Then, select a test item from the menu and execute the selected test, e.g. ROM test.
After the test has been finished, be sure to return the display to the normal mode (Watch display).
Watch
Select "P", then press key.
* System protected *
Protection < >
Diagnosis < > ON OFF
This is a password to display the "protection" menu.
ROM RMT KEY DIS PRT
Select "OFF", then press key. (Now the test mode is selected.)
ENT SELECT 9 V P ID ENT Test Menu CANCEL 3 1. ROM/RAM test 2. Remote line test
3. Keyboard test 4. Display (LCD) test 5. Printer test
Select test desired with the arrow keys,then press key.ENT
6 5 2 1 1 1
