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 Te l e p h o n e : 0 7 9 8 - 6 5 - 2 111 Te l e f a x : 0 7 9 8 - 6 5 - 4 2 0 0 Yo u r L o c a l A g e n t / D e a l e r Al l ri g h ts r es e r ve d . Printed in Japan F I R S T E D I T IO N : F E B . 2 0 0 0 B : S E P. 1 2 , 2 0 0 0
Chapter 1. General
1.1 Display Unit ... 1
1.2 Scanner Unit... 2
Chapter 2. Block Description
2.1 General ... 32.2 Display Unit ... 4
2.3 Scanner Unit... 5
2.4 Functions of Each Circuit board ... 6
Chapter 3. Adjustment
3.1 Display Unit ... 133.2 Scanner Unit... 14
Chapter 4. Maintenance
4.1 Maintenance Parts ... 154.2 Replacement of Major Parts... 16
4.3 How to change system program... 21
Chapter 5. Troubleshooting
5.1 Maintenance Menu... 225.2 Error Messages... 23
5.3 Troubleshooting Matrix table... 23
5.4 Test points on Each Board ... 25
Exploded View
... D-1Schematic Diagram... S-1
Electrical Parts List... E-1
Chapter 1. General
1.1 Display
Unit
All parts are sandwiched together and fastened by four screws and three connector fixing nuts from the rear side.
Figure 1-1. Construction of Display Unit
Protection against EMI
Many radars use conductive paint inside their covers to protect against EMI (Electro Magnetic Interference). This model, however, is not painted, but has a shield cover over the DU board for protection against EMI.
Waterproofs
The display unit conforms to the IEC standard IPX5; namely, waterproof against water jets. Even the small hole to the right of the arrow keys, which is where the aural alarm is released, is
waterproof. A “breathing sheet” between the panel cover and the buzzer allows air to pass and prevents water from being drawn into the enclosure during atmospheric pressure changes.
Resin cover Shield cover DU Board LCD Display PNL pcb Panel cover
1.2 Scanner
Unit
The scanner unit mainly consists of INT Board (03P9271), IF AMP Board (03P9269), MIC (RU-9458), radiator, antenna motor, reed switch which generates HD signal, magnetron, and MD Board
(03P9270).
Power to Scanner Unit
The ship’s mains is directly supplied to the scanner unit, where various voltages are made.
Therefore, if the antenna cable length of 12VDC set is 20m or more, scanner rotation may
be abnormal due to voltage drop. If the antenna cable is more than 20m, modify the unit to 24VDC set.
Antenna Cable
Both the scanner unit and the display unit have a CPU. They communicate with each other on two lines, “COM (HOT)” and “COM (COLD)”. The result: the number of lines in the cable was reduced.
Figure 1-2 Antenna Cable
Conventional radars MODEL 1622
COM (HOT) 1 COM (COLD) 2 BP/HD 3 TRIGGER 4 VIDEO 5 GND 6 S.M. (HOT) 7 S.M. (COLD) 8 GND 9 SHIELD 10 1 GAIN 2 STC 3 TUNE 4 TUN.IND 5 MOTOR(+) 6 MOTOR(-) 7 BP 8 HD 9 P/L-A 10 P/L-B 11 TRIGGER 12 VIDEO 13 GND 14 +12V 15 -12V 16 GND 17 SHIELD
Chapter 2. Block Description
2.1 General
The CPU on the DU board of the display unit communicates with the CPU on the SD board of the scanner unit in RS-422 format.
Figure 2-1. Simplified Block Diagram
The trigger pulse from the DU board is modulated at the MD board to oscillate the magnetron. The echo received by the antenna is amplified by the IF amplifier and is fed to the DU board as a video signal. The DU board converts the analog signal to digital signal and processes to display it on the LCD.
Bearing pulse (BP) and heading signal (HD) are generated in the scanner unit and received by the DU Board in the display unit.
Radiator
Transceiver Display Unit
PNL Board Scanner Unit Ship’s mains DU Board LCD Signal processor & power supply Video signal BP/HD Communication (H.C) Trigger Ship’s mains (H.C) INT Board MD Board IF Board
2.2 Display
Unit
The display unit features that;
1) DU Board produces LCD back-light voltage of 210VAC.
2) An artificial echo signal (instead of the video signal) can be selected.
3) The interface communicates with the scanner unit in RS-422 format.
The TX trigger is made at the gate array (!) and is fed to the scanner unit. The received video signal is A/D converted and is sampled at the gate array (!). The echo on each sweep is stored on the V-RAM via the gate array ("). Upon receiving the heading pulse, the stored data are output to the LCD in four shades of gray, according to echo strength.
Figure 2-2. Block Diagram of Display Unit
FTC A/D CONV. CPU I/F I/F FILTER DC-DC CONV. R-C CONV. DU Board 03P9268 PANEL Board PNL9194 ROM RAM GDC V-RAM GATE ARRAY ( ) GATE ARRAY ( ) LCD EEPROM 03S9461 VIDEO From Scanner
From NAV AID NMEA RS-422 BP-HD To Scanner From Scanner To Scanner Ship’s Mains To Scanner U105 U114 U126 L1,L2 U6,Q6,T1 Q52,Q53,T2 ADJ U119 U109 U115 U108 U107,C104 R112 U101 U111 U108 U113 U116 U112 TRIGGER 5V 12V 6V 22V AC210V Back-Light volt.
2.3 Scanner
Unit
The scanner unit features that;
1) The powers supply circuit for the scanner unit is provided on the SD board.
2) The SD board in the scanner unit communicates with the display unit.
3) Auto-gain and auto-STC circuits make operation easy.
The TX trigger from the display unit is modulated and oscillates the magnetron. The received echo is fed to the MIC and is amplified at the IF amp. The output is divided two lines: one is led to the display unit and the other is applied to the interface for auto-gain and auto-STC functions.
Figure 2-3. Block Diagram of Scanner Unit INTERFACE POWER SUPPLY IF AMP MODULATOR MD Board 03P9270 MIC Circulator M ANT. Magnetron E3588 (V801) RM-9455 (B801) 03P9267 RU-9458 (U801) IF Board 03P9269 INT Board 03P9271 VIDEO IF TUNE GAIN Auto Gain Auto STC Auto Tune Communication Motor Drive A/C SEA TUNE COM Display Unit BP/MD 12V 8V TX-HV 5V TRIGGER SHIP’S MAINS
2.4 Functions of Each Circuit board
2.4.1 Display Unit
The display unit consists of DU board (03P9268), PANEL board (PNL9194), and LCD indicator (03S9461).
PANEL Board
Mounted on this board are the operating keys, panel-illuminating LEDs, and electrical buzzer, constituting the man-machine interface.
DU Board (03P9268)
The reference oscillator U125 is a quartz oscillator which generates an accurate and stable reference frequency signal. This reference frequency signal is the source of the transmission trigger, the clock for video signal processing in the display unit, the time-base signal, the reference clock for LCD display, the reference clock for CPU, and so on.
According to the distance range selected in the panel operation, CPU computes the ratio of dividing the reference frequency and sends the data to the gate array U111 (radar signal
processing circuit). Based on the data, U111 creates the transmission trigger from the reference frequency signal.
This radar intentionally varies the pulse repetition frequency of the transmission trigger to prevent the interference signals from other radars.
The IF video signal from scanner unit inputs to the video circuit on the DU board.
The video circuit includes FTC circuit that rejects the reflecting signals from the rain and snow. CPU switches on or off the FTC function according to the panel operation.
The IF video signal is converted by a A/D converter to the three-level digital signal, which inputs to the gate array U111 (radar signal processing circuit). In U111, the input digital IF video signal is sampled with the sampling clock corresponding to the range setting. Further in U111, when the interference rejector is turned on in the menu, each receiving video signal is correlated with the corresponding transmission to reject the interference signals from other radars. The video signal output from U111 is written in the VRAM U116 for the display.
The antenna bearing signal and heading signal are input to CPU from scanner unit. The heading correction data, obtained at heading alignment (instllation menu) is stored in EEPROM U105, and CPU computes the correct direction of the antenna, using the correction data. The data to correct the difference between the transmitting and receiving timing is obtained at TX time delay adjustment (installation menu) and is also stored in EEPROM U105. The correction is carried out in U118.
While the target scanning system of the radar uses the method of R#$ coordinates, LCD display of this radar employs the method of X-Y coordinates, which is similar to so called TV-sweep method.
The sweep time of the LCD display is independent of that of the radar scanning system, so VRAM U116 is provided as the interface between them.
In order to write the radar echo signal received after every transmission trigger on VRAM U116, CPU converts the antenna bearing signal $ into the values of SIN$ and COS$ and send them to U118. U118 further converts them to X-Y coordinates of RSIN$ and
RCOS$. These values are used as the address to write the radar video signal on VRAM U116. VRAM U116 also holds the past video signal for display for a trail time specified by the panel operation.
According to the settings of the operating panel, CPU writes on VRAM U113 the display data such as the fixed range rings, EBL, VRM, cursor, guard alarm range, and scale of azimuth angle. Further, CPU also writes on VRAM U113 the character and numbers to be displayed on the screen. For writing these data, GDC U112 is used.
The data writing/reading onto/from the VRAM is carried out by U118 in time-sharing method. The display data are read out from VRAM and sent to LCD display using GDC U112.
The signals for controlling scanner unit (including the transceiver) are converted to RS-422 serial signals in U119 and sent through a balanced RS-422 cable so that the signals may not be affected by external noise. The control signals include those for switching the transmission on/off,
adjusting the transmitting pulse width and IF amplifier gain, and adjusting STC.
The information from the navigational aid is received through U114 and U126 to be displayed on the radar screen.
The unit requires power supply source ranging 10.2 to 31.2 V DC. This voltage meets the voltage requirement for ships: 10% lower and 30% higher than 12V/24V ship’s mains. This DC power is supplied through noise filters, L1, and L2, to the pulse-width-controlled DC-DC
converter mainly consisting of U6, Q6, and T1, which generates the stable voltages of +5 V, +12 V, -6V, and -22 V that are needed in display unit. The voltage +5 V is mainly used for the digital circuits, +12 V and -6 V are used for the video and other analog circuits, and –22 V is for the LCD display. The DC-AC inverter consisting of Q52, Q53, and T2 generates AC 210 V which is used for the backlighting of the LCD display.
If the power supply is reverse-connected to the radar, the reverse-polarity protector activates so that the circuit breaker is tripped or fuse is blown off to prevent the damage to the unit.
2.4.2 Scanner Unit
INT Board (03P9271)INT board contains: one-chip CPU U3, that includes the RAM, ROM, and analog ports; U5 including I/O ports the stepping motor drive circuits; and U7 including the A/D converter which outputs tuning, gain, and STC control signals.
The output from U7 is used to control the STC and gain of the IF amplifier and the frequency of microwave local oscillator for MIC.
The operating conditions of the radar that have been set on the operating panel of the display unit are sent to the CPU U3 on the INT board through the RS422 communication line. The CPU U3 controls the stepping motor drive circuit U5 which drives the stepping motor to rotate the antenna. The antenna azimuth signal is created in the stepping motor drive circuit and mixed with the heading signal (S801), and sent to the display unit.
In order to change the transmitting radar pulse length according to the selected range, the pulse width information is sent from the INT board to the modulation circuit on the MD board. There are the automatic mode and manual mode to adjust the gain of the IF amplifier. In the automatic mode, CPU U3 monitors the video signal from the IF amplifier, and the monitored signal inputs to the A/D converter U7 through the I/O port U5, and the A/D converter output controls the IF amplifier gain. In the manual mode, the signal set by manual setting inputs to the A/D converter, and the A/D converter output controls the gain of the IF amplifier.
This radar employs an automatic tuning system in which the main bang signal from the IF amplifier is amplified and inputs to CPU U3 as the signal indicating the tuning level.
The CPU U3 controls the output of the A/D converter U7 so that the tuning indication level may become maximum.
The adjustment of STC is also carried out in the same way as the gain adjustment.
IF Amplifier Board (03P9269)
The IF amplifier, the intermediate frequency of 60 MHz and band width of 7 MHz, consists of Q1, U1, U2, and a buffer Q4. This board includes the gain and STC control circuits consisting of Q2 and Q3. Another circuit, consisting of Q5 to Q10, detects the main bangs to indicate the tuning level.
RU-9458 Module
This module includes the circulator and MIC circuit that converts the microwave frequency to the intermediate frequency.
The circulator switches between the transmitting and receiving microwave circuits so that the transmitting radio energy may be efficiently transmitted to the antenna without leaking to the receiver side and the receiving radar signal from the antenna may be sent with efficiency to the receiver without leaking to the transmitter side.
The receiver side is provided with the waveguide to coaxial converter, diode limiter, and balanced mixer. The diode limiter, set after the converter, protects the balanced mixer from the excessive input power, and the mixer converts the input microwave signal to the 60-MHz IF signal.
A voltage-controlled FET oscillator outputs the signal to the mixer.
MD Board (03P9270)
The power supply circuit and modulation circuit of the scanner unit (transceiver) are mounted on the MD board.
There are provided two DC-DC converter power supply circuits: one supplies –6 V, +5 V, and +12 V to the circuits except the magnetron and the other supplies power to the magnetron heater and TXHV. The two DC-DC converters generate stable voltage outputs with Q803 and Q832 driven by the pulsewidth controllers U801 and U805.
The magnetron current, -6 V, +5 V, +12 V, +8 V (magnetron heater voltage), and TX HV can be checked at the check points TP804 on the board.
In the magnetron modulation circuit, the transmitting pulse waveform is determined by the one-shot multivibrator U851 which is triggered by the transmitting trigger pulse. The pulsewidth of the multivibrator is set by the time constant which is determined by the pulsewidth control signal from INT board. The output of the multivibrator inputs to the FET switching transistor Q857 through transistor buffer Q853 and variable resistor VR851. The VR851 presets the voltage for driving Q857 to determine the magnetron output power.
Figure 2-4. Block Diagram of INT Board (03P9271) VIDEO U4Amplifier Q1 Buffer Q3 Q6 Buffer Q11 Q12 Q13 Mixer Buffer Antenna
motor drive signal
U5 I/O PORT U3 CPU TUNE IND PL A PL B Tune Control STC Control GAIN Control U7 D/A Q14 Q15 Q16 BP/HD BP HD Marker TRIG RS422 U1
Q803 Q801 Pulse width controller Q801 Q802 Q805 CR804 Error detector
Q851,Q852 Pulse width decoder
U851 Pulse width controller
Q801 CR831 CR832 VR801 6V 12V 5V 8V U804 Regulator
U805 Inverter driver
T851 Medulation transformer VR851 Q857 Q853 Buf fer Q855 Q856 Buf fer CR837 CR838 CR836 T802 L851 TUNE GA T E CR855 MAG.CUR. TX HV Q832 6V 12V TP804 MAG.CUR. HV .CHECK 5V 8V
Figure 2-6. Block Diagram of IF AMP Board (03P9269) Q1 1st IF AMP STC Control VIDEO Output Q4 Buffer U2 3rd IF AMP Video detector U1 2nd IF AMP Q5 to Q10 Tune level detector Q1 1st IF AMP 60MHz IF LC filter Q2 Q3 GAIN STC Controllers 60MHz IF LC filter 60MHz IF-IN GAIN Control
TUNE GATE input TUNE IND output Trigger
Chapter 3. Adjustment
DANGER
Both display and scanner units use high voltage electricity, which endanger human life. Precautions must always be exercised when reaching inside the unit. (1 kVAC for LCD backlighting and 300 VDC for TX)
3.1 Display
Unit
Voltage check
Remove the resin cover, and measure each voltage. It is not necessary to open the shield cover on the DU board.
Table 3-1
Item Setting Test point Ratings Adjuster
"5 V TX
#8NM$ TP4#"$%TP5#&$ 4.95'5.05 Vdc VR2 "12 V ST-BY J1#7#"$%J1#5#&$ 11.2'12.4 Vdc
&22 V ST-BY J1#10#"$%J1#5#&$ &22.9'&20.7 Vdc
&6 V ST-BY J1#9#"$%J1#5#&$ &6.0'&5.0 Vdc
3.2 Scanner
Unit
Voltage check
Open the radome, and measure each voltage with the modulator cover removed.
Table 3-2
Item Setting Check point Rating Adjuster
"12 V ST-BY TP804#3#"$%
TP804#4#&$ 11.9'12.1 Vdc VR801 "8 V
heater volt. ST-BY
TP804#6#"$% TP804#4#&$ 7.8'8.2 Vdc TX-HV (divided) TX(Note) (3NM) TP804#7#"$% TP804#4#&$ 8.5'9.35 V Magnetron current TX(Note) (3NM) TP804#5#"$% TP804#4#&$ 2.8'3.6 V VR851
Note) To transmit with scanner rotation suspended, turn on the power while pressing and
holding down the%&'key. After one minute, the radar is in transmission mode.
VR851
VR801
Chapter 4. Maintenance
This unit is designed for board level maintenance, not component replacement.
4.1 Maintenace
Parts
Table 4-1 Maintenance Parts
Parts Type Code No. Remarks
DU Board 03P9268 008-499-680 PNL Board PNL9194 008-481-680 MD Board 03P9270 008-499-650 IF Board 03P9269 008-499-640 INT Board 03P9271 008-499-660 LCD Unit DG52Y-5MC 000-142-310 MIC S-RX50/RU-9458 000-142-269 Magnetron E3588 000-142-270 Antenna Motor RM-9455 000-142-252 Fuse FGBO-A, 5A, 125 V 000-549-064
Program ROM PROM0359158101 008-499-730 U115, DU Board Radome cover RSB-0060 008-440-720
4.2
Replacement of Major Parts
Removing display unit cover and shield plate
1. Loosen and remove the nuts from three jacks at the display unit cover.
2. Remove four screws fixing the display unit cover.
3. Remove the display unit cover, the shield cover will be exposed.
4. Of the two shield tapes attached to the shield cover, remove the shorter one.
5. Remove four screws fixing the shield case.
6. Lift up the shield case to expose the board.
Reassembling
7. Fix the shield case to the board with four screws.
8. Attach the shield tape (shorter one) supplied to the same position as before.
9. If the longer shield tape came off during work, exchange it with new one.
Parts Name Type Code No.
Shield tape DK-102-35/L=45
Figure 4-1. Display Unit, rear view Figure 4-2. Display Unit, cover removed Shield tape
Figure 4-3. How to run shield tape
!
!
!
!"
"
"
"
#$%&'()*+,& P.C. Board Chassis Space Shield case P.C. Board ChassisFigure 4-4. Panel(E) 03-135-1021 LCD Assy. Cover A View from A LCD O-ring (small) O-ring (large)
VH connector wires from LCD
Never run wires beyond this line.
Round side LCD DG 052Y-5MC (P)DU 03P9268 Shield plate 03-146-1002 PCB fixing plate, 03-118-1001 P3, Flat cable J3 J2
Rubber key(E) 03-135-1022 (P)PNL PNL9194 Panel packing 03-118-1006 PW sheet 86-009-1022 Figure 4-6.
STS Belt and Motor
1. Unscrew four M3(8 screws (() fixing the bearing retainer.
2. Remove the radiator assembly.
3. Replace the belt (or motor) with new one.
No tension adjustment of the belt is necessary.
4. Assemble the unit by reversing above steps.
Driving Pulley B801 Motor STS Bert Connector M3 6 SCM3 M3 8 2pcs. M3 8 4pcs. RM-9455 40S2M266UG 03-146-3304 Fix at the same time. two dowels Driver Pulley Radiator Assy. Bearing Retainer
Use this hole to loosen the screw fixing the bearing retainer.
Driver pulley, top view dowels B View from B STS Belt Driving pulley Driver pulley
Magnetron
Handle the magnetron, taking the followings into account.
1. Use a non-magnetic screw driver to dismount and mount the magnetron.
2. Keep the magnetron 25mm away from the metals.
3. Never pull the magnetron lead wires.
MIC
See figure below.
M4 20
Remove shorting plug.
U801 S-RX50 V801 Magnetron E3588 M4 10 4pcs. Dowels Dowels IF 03P9269 J810 J808
4.3
How to change system program
PROM, U115 on the DU Board stores system program. Change the ROM to update the program.
Raw ROM Type : M27C1001-10F1
Program No.: 035915800X
Replacing program ROM
1. See page 18 to gain access to the DU board.
2. Remove the lock band of the program ROM (U115)
3. Detach the program ROM from the socket by using a dedicated tool or a screwdriver.
4. Insert the update ROM (0359158104) to the socket.
5. Secure the ROM by using the lock band previously removed.
Figure 4-9. DU Board (03P9268) U115(PROM)
The unit does not provides self-test function. This chapter mainly describes how to check each block.
5.1 Maintenance
Menu
To open the maintenance menu;
1. Turn the radar on.
2. Wait until the initial screen appears, then press and hold UP and DOWN keys together.
3. In about 10 seconds, the maintenance menu as shown below will appear.
4. Press MENU key to close the menu.
Figure 5-1. Maintenance Menu
1) Reading program Number:
The program number appears at the upper left corner. 2) When connecting M1621MK2 scanner unit
The scanner unit of M1621 and M1621MK2 can be connected to the display unit of M1622. For this combination, the MODEL in the maintenance menu must be set to “1621/M2” which provides magnetron warm-up time of 90 seconds. The use in wrong setting may shorten the life of the magnetron or damage the magnetron. The scanner unit of the M1622 is designed for the warm-up time of 60 seconds.
3) Selecting “Demo display”
5.2 Error
Messages
The following messages appear to call the operator’s attention to missing heading or bearing pulses. Check the scanner cable for damage or disconnection when these messages appear.
Table 5-1. Error Messages
Message Meaning
HD-SIG-MISS Heading pulse is not applied to the CPU on the DU board. The heading mark disappears.
BP-SIG-MISS Bearing pulse is not applied to the CPU on the DU board. Radar automatically changes from TX to ST-BY mode.
5.3
Troubleshooting Matrix table
The troubleshooting matrix table on the next page helps the service technician to quickly identify defective pcb or block. To use the table, locate the symptom in one of the three columns of the table. Possibly defective circuits and their likelihood of defectiveness, indicated by a circle, star or triangle, corresponding to 70 to 80%, approximately 20% and a few percent respectively, are listed in each column. Numeral inside circle shows degree of possibility; the smaller the number, the higher the possibility.
Note) Before consulting the table, check the ship’s mains (input voltage at J1351#1(+) and
9 ) * 8 + * + ) , 7) Inc o rrec t target beari ng. 8) P oor s ens it iv it y. 9) K e y board i s pres s ed but no res pons e. 7 ) 6 + * ) 5 * ) , 4) Mark s and l egends do not appear . 5) Mark s and l egends appear , but no noi s e nor ec ho. 6) Mark s , l egends and noi s e appear but no ec ho. 4 ) 3 , ) * 2 ) + 1) P o w e r c an not be s uppl ied. 2) P o w e r i s s uppl
ied but nothi
ng appears on LC D . 3) S c anner does not rotate. 1 , ) Symp to m 52Y -5 M C
5.4
Test points on Each Board
1) DU Board)03P9268*
Test point Check Item Ratings Remarks
TP1 DC&
TP2/TP1 "9V 8.7'9.9Vdc U3-#5
TP3/TP1 Q6-D 21.7'29.4us Switching Waveform (Primary)
TP4/TP1 "5V 4.8'5.2Vdc
Adjuster: VR2
Same reading at between J1-#2(+) and J1-#5(-)
TP5 GND GND
TP7/C55 INV 11.2'14.5V-68'92kHz DC-AC Inverter, Primary TP11/TP5 XTAL 36.85'40.85kHz
TP12/TP5 BLCK 8.1725'10.7125kHz BLCK, U118-#87
TP13/TP5 TRIG V=9.0'12.0.
T=6.0'10.0us TX Trigger, U111-#60
TP14/TP5 BP V=4.0'5.2V
T=5.5'6.5ms Bearing, U118-#138
TP15/TP5 HD V=4.0'5.2V
T=2.5'2.9S Heading, U118-#137 TP16/TP5 VIDE Same wave as
TP602, IF Board (03P9269) Video, DJ1-#6
2) MD Board)03P9270*
Test point Check Item Ratings Remarks
TP801/TP802 +9V 8.7'9.9Vdc
TP803/TP802 VD1 34'46kHz Save wave as VD2 TP804-1/ TP804-4 -6V -6.9'-5.5Vdc
TP804-2/ TP804-4 +5V 4.75'5.25Vdc
TP804-3/ TP804-4 +12V 11.9'12.1Vdc Adjuster: VR801
TP804-5/ TP804-4 Magnetron Current 2.8'3.6Vdc Adjuster: VR851, TX, 3nm Range TP804-6/ TP804-4 +8V 7.8'8.2Vdc TP804-7/ TP804-4 ST-BY/TX 8.5'9.35Vdc (8.1'9.1Vdc) ST-BY (TX-6nm) TP805/TP806 +12V 11.9'12.1Vdc
TP807 GATE2 Waveform 2 Gate signal of switching FET
TP808 VD2 Waveform 3
TP811 TRIG Waveform 1
3) IF Board)03P9269*
Test Point Check Item Ratings Remarks
TP601 IND 2.5Vdc
TP602 ECHO Waveform 6
TP603 AGC Same as STC waveform
TP604 IF Not measurable
4) STC Waveform
Condition ; TX, STC voltage (J809 #9) adjusted to 3.4 to 3.6 V manually. Test Point ; Between R46 and R47.
-./001-23"45 678790:)6 .;9/4:-, .-<8=>!" #&??%@A,)B@)B,*%''B,*B7& C4::)6D)0:4:-, ;+E&FBGH/ -./:I1"J-KC5 678790:)6 F9L/MNO ..BP&G),Q77'RS)CT)6 #&??%@A,)B@)B,*%''B,*B7& C4::)6D)0:4:-, ;+E&FBGH0 -./:/16UC5 67879CV)6 F9L/MNO ..BP&G),Q77'RS)CT)6 #&??%@A,)B@)B,*%''B,*B7& V4::)6D)0:4:-, ;+E&FBGH1
-./0L1-<4.;45 678790:)6 .;904:-, .-<8=>!" #&??%@A,)B@)B,*%''B,*B7& C4::)6D)04::-, ;+E&FBGH2 -./0T1"J-K05 67879/)6 F9T:MNO ..BP&G),Q77'RS)CT)6 #&??%@A,)B@)B,*%''B,*B7& C4::)6D)0:4:-, ;+E&FBGH3 :L.WCXW -.X:C1KYN>5 K*$B)+77&+G,)+F?&G)H+%@)Z+@A 0)?B)L)6 #&??%@A,)B@)B,*%''B,*B7& 04::)6D)C::@, ;+E&FBGH4