RB1100 Repair Manual

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TroubleShooting for RB1100r3

Change faulty ferrite bead

Check Zener diode

D1103

NOT OK

O

K

Check ferrite bead FB1101 resistance.

It should be less than 1Ohm

The board is unrepairable

Problem still

appears

Check P-channel

MOSFET Q1102

Change faulty MOSFET

NOT OK

Check Schottky diode

D1101

Change faulty diode

NOT OK

O

K

Change faulty components

Check N-channel MOSFETs

Q1103, Q1108 and Q1109

Change faulty MOSFETs

NOT OK

Check resistor R1149 resistance.

It should be 10 Ohm

Change faulty resistor

NOT OK

Check PNP transistor Q1101

and Zener diode D1104

No power, blue LED is not lit

Check Buck controller

U1101

Change faulty controller

NOT OK O K O K

Check 5.0V output on

NPN transistor Q1105 pin#3

NO 5.0V

Change faulty Zener diode

O K O K O K

Check Zener diode D1106

NO

T O K

O_K

Change faulty transistor

Q1105

These repair instruction are for NON WARRANTY repairs only!

Please make visual inspection for signs of corrosion

or mechanical damages before starting

NOT OK

(2)

FAN does not work

Check ferrite beads FB807, FB808

resistance. It should be less than 1 Ohm

Check Schottky diode

D1401

Check 12V output,

for example on C1416 pins

Check FAN

Change faulty FAN

Change faulty ferrite beads

Change faulty diode

NOT OK NO 12V NOT OK NOT OK O K O K O K

The board is unrepairable

Problem still

appears

PoE does not work

Check Rectifier Bridges

D1102, D1105

Change faulty Bridges

NOT OK

Check Ethernet connector

J5

Change faulty connector

O

K

NOT OK

Problem still

appears

The board is unrepairable

Change faulty Step-Up

DC-DC converter U1402

(3)

RB does not boot,

green and blue LEDs are lit

The board is unrepairable

Change faulty oscillator

Problem still

appears

Change faulty Buck controller U1102

Change faulty MOSFET Check 1.8V output,

for example on C1135 pins Check 1.0V CPU core output,

for example on C1462 pins

Check N-channel MOSFETs Q1405, Q1406 NO 1.0V

Check 66MHz CPU clock on oscillator Y4 pin#3

OK

Check N-channel Dual MOSFET Q1104 Check resistor R1165 resistance. It should be 10 Ohm OK N O T O K

Change faulty resistor Change faulty MOSFETs

N O T O K Check 5.0V output on NPN transistor Q1401 pin#3 OK

Change faulty Buck controller U1406

Change faulty NPN transistor Q1401 and Zener diode D1402

N O T O K Check 2.5V output, for example on C1485 pins

NO 2.5V

Change faulty LDO U1410

O K N O T O K OK NO 1.8V Check 0.9V output

on Termination Regulator U1103 pin#4

NO 0.9V

Change faulty Termination Regulator

O K O K O K NO 66MHz clock

(4)

The board is unrepairable

Problem still appears

Change faulty diodes arrays and

Ethernet PHY U501

Ethernet port1 (J5) does not work,

drop ping packets

Change faulty transformer

Check Transformer TR5

Check voltage drop between D501, D503 pin#1

and Ground. This value should be in the range

from 0.3V to 0.35V measured in diode mode

(hold “positive” wire on the ground

and “COM” wire to D501 pin#1)

Check 25MHz Ethernet clock

on crystal Y501

Change faulty crystal

NO 25MHz

Check ferrite bead FB505 resistance.

It should be less than 1 Ohm

Change faulty ferrite bead

NOT OK

O

K

Check ferrite bead FB5 resistance.

It should be less than 1 Ohm

Check 25MHz clock

on crystal Y502

O K O K NOT OK NOT OK

Check 125MHz clock on resistor

R775 pins

Check 125MHz clock on crystal

oscillator Y702 pin#3

OK

NO 12

5MHz

Change faulty PLL clock driver

U702

NO 125MHz

Change faulty crystal

oscillator

O

K

Change faulty crystal

NO 25MHz

NOT OK

Change faulty ferrite bead

O

K

O

K

Try to change Frequency

generator U502

O

(5)

The board is unrepairable

Problem still

appears

Change faulty diode arrays

Check connector J601 for mechanical damages

Check ferrite bead FB603 resistance.

It should be less than 1 Ohm

Change faulty ferrite bead

NOT OK

O

K

Check 25MHz clock on crystal Y601

Change faulty crystal

NO 25MHz

Ethernet port2, 3 (J601) do not work,

drops ping packets

Check voltage drop between D601, D603 (for port2),

D605, D607 (for port3) pin#1 and Ground.

This value should be in the range from 0.3V to 0.35V

measured in diode mode (hold “positive” wire on the

Ground and “COM” wire to one of diode array pin#1,

for example to D601 pin#1)

Change Ethernet Gigabyte NIC U601

O

K

Check ferrite bead FB605 resistance.

It should be less than 1 Ohm

NOT OK

Change faulty ferrite bead

Check 25MHz clock on crystal Y602

Change faulty crystal

NO 25MHz

Change Ethernet Gigabyte NIC U602

O K O K O K O K

Change faulty Ethernet port J601

O K

For

Port

2 For

Port

3

NOT OK NOT OK

(6)

Ethernet port4-8 (J901-J905) do not work,

drops ping packets

Change faulty diode arrays Check voltage drop between diodes arrays D901, D904, D905,

D907, D909, D911, D913, D915, D917, D919 pin#1 and Ground. This value should be in the range from 0.2V to 0.25V measured

in diode mode (hold “positive” wire on the Ground and “COM” wire to one of diode array, for example to D901 pin#1)

NOT OK

O

K

Check ferrite beads FB901, FB902, FB903, FB904, FB905 resistance. Each resistance should be less than 1 Ohm

NOT OK

Change faulty ferrite beads

Check 1.6V output, for example on C1443 pins

O

K

NO 1.6V

Check ferrite beads FB1403, FB1405 resistance. Each resistance should be less than 1 Ohm

N

O

T

O

K

Change faulty DC-DC Step Down Converter U1405

O

K

NO 1.05V

N O T O K OK

O

K

Check ferrite beads FB1001-FB1006 resistance. Each resistance should be

less than 1 Ohm

NO T O_K

Change faulty ferrite beads OK

Change faulty 6-port GbE Switch U9

Check 25MHz Ethernet clock on crystal Y9 pins

NO 25_MH

z

Change faulty crystal OK

The board is unrepairable

Change faulty Ethernet connectors Check termination resistance between Tx and Rx line in the

connectors J901-J905. It should be 150 Ohm +/-2%

NOT OK

O

K

(7)

Ethernet port9-13 (J701-J705) do not work,

drop ping packets

Change faulty diode arrays Check voltage drop between diodes arrays D701, D703, D705,

D707, D709, D711, D713, D715, D717, D719 pin#1 and Ground. This value should be in the range from 0.2V to 0.25V measured in diode mode (hold “positive” wire on the Ground and “COM” wire

to one of diode array, for example to D701 pin#1)

NOT OK

O

K

Check ferrite beads FB701, FB702, FB703, FB704, FB705 resistance. Each resistance should be less than 1 Ohm

NOT OK

O

K

NO 1.6V

Check ferrite beads FB1403, FB1405 resistance. Each resistance should be

less than 1 Ohm

N

O

T

O

K

NOT OK

O

K

NO 1.05V

N O T O K OK

O

K

Check ferrite beads FB801- FB806 resistance. It should be

less than 1 Ohm NO T O

K

OK

Change faulty 6-port GbE Switch U701

Check 25MHz Ethernet clock on crystal Y701 pins

NO 25_M

Hz

Change faulty crystal

OK

The board is unrepairable

Change faulty Ethernet connectors Check termination resistance between Tx and Rx line

in the connectors J701-J705. Each resistance should be 150 Ohm +/-2%

NOT OK

O

(8)

Reference

number

Part Number

Manufacturer

Description

D1101 SK36-T3-LF Won-Top Electronics Co.,

Ltd. Diode Schottky 60V 3A SMC

D1103 BZX84C10-T1-LF Won-Top Electronics Co.,

Ltd. Diode Zener BZX84C 10V 5% 225mW SOT23 D501, D503, D601, D603, D605, D607, D701, D703, D705, D707, D709, D711, D713, D715, D717, D719, D901, D904, D905, D907, D909, D911, D913, D915, D917, D919

AOZ8000CIL Alpha & Omega IC TVS ARRAY LOW-CAP SOT23-6

D1102, D1105 DF02S Diodes Incorporated 1A 200V Rectifier Bridge

FB5, FB603, FB605, FB701-FB705, FB801-FB806, FB901-FB905,

FB1001-FB1006

BLM15AG121SN1D Murata manufacturing

Co.

Ferr Chip Beads 120 Om 500mA, 0402, FB120

J701-J705, J901-J905 ARB-1FAK-F235-B Super Link Electronics

Co., Ltd.

RJ45 Ethernet connector 10/100/1000 magnetics(Gigabit), LEDs(G/Y)

D1104 BZX84-B27,215 NXP Semiconductors Diode Zener BZX84B 27V 2% 350mW

D1106 BZX84-C5V6,215 NXP Semiconductors Diode Zener BZX84C 5.6V 5% 350mW

D1401 SX36-T3-LF Won-Top Electronics Co.,

Ltd. Diode Schottky 60V 3A SMA

FB506, FB604, FB606 BLM15AG121SN1D Murata manufacturing

Co.

Ferr Chip Beads 120 Om 500mA, 0402, FB120

FB807, FB1405 BLM18SG121TN1D Murata manufacturing

Co. Ferr Chip Beads 120Ohm, 3.0A, 0603

FB808 BLM18EG221SN1D Murata manufacturing

Co. Ferr Bead 220 Ohm, 2A, 0603

FB1101

FBMA-11-453215-900A90T

King Core Electronics

Inc. Ferr Bead 90 Ohm, 9A, 4mOhm, 1812

FB1403, FB1409,

FB1411 BLM18PG331SN1D

Murata manufacturing Co.

Ferr Chip Beads 330 Om 1200mA, 0603

J5 8108-B114 Powerway Electronics

Co., LTD.

RJ45 with LEDs (G/Y) Tab down,pre-soldered shielding pins

J601 AR6-2DHD-1234-B Super Link Electronics

Co, Ltd

1x2 RJ45 tab up, w/o transformer, with LEDs (Green/Yellow), with

pre-soldered shielding pins

FB1410, FB1412 RC0603JR-070RL Yageo Corporation Resistor 0R 5% 0603

Q1102 AO4441 Alpha & Omega P-Ch MOSFET -60V -4A 100mOhm

SO-8

Q1104 AP9960GM Advanced Power

Electronics Corp.

N-channel Dual MOSFETs,Vds = 40V, Id = 7.8A, Rdson = 20mOhm, SO-8

Q1101 BC856B,215 NXP Semiconductors Small Sign PNP 250mW SOT-23

Transistor

Q1103, Q1108, Q1405,

Q1406 AO4484 Alpha & Omega

N-Ch MOSFET 40V 10A 10mOhm SO-8

When you order components for repairing router boards from our sales,

please, write components reference number not a part number

(9)

Reference

number

Part Number

Manufacturer

Description

U9, U701 AR8316-AK1E Atheros Technology Ltd. 6-port GbE Switch

R1149, R1165 RC0402FR-0710RL Yageo Corporation Resistor 10R 1% 0402

U502 ICS9FG108DGLFT IDT Frequency Generator for CPU, QPI,

FBD, PCIe & SATA, TSSOP48

U501, U601, U602 AR8131-AL1E-R Atheros Technology Ltd. AR8131, QFN48-04MM, Gbe NIC,

PCIe, 3V T&R

U702 CDCVF2505PWR Texas Instruments PLL clock driver 1-to-5, TSSOP-8

U1101, U1102, U1406 RT8209BGQW Richtek Technology

Corporation

Synchronous Buck Controller,Vin=4.5...26V,

WQFN-14L_3.5x3.5

U1103 AIC1384-GSHTR ANALOG INTEGRATIONS

CORPORATION DDR2 Termination Regulator, PSOP-8

U1402 RT9297GQW Richtek Technology

Corporation

WDFN-10L_3x3, Vin=2.6...5.5V, Vout_max=24V, Ilim=3A,

f=0.64MHz|1.2MHz

U1410 RT9183HPS Richtek Technology

Corporation 1.5A Adj LDO SO8

Y4 FN6660077 PSE Technology

Corporation

Crystal Oscillator 66.666MHz 25ppm 3.3V 15pF -55+125 7x5

U1405, U1407, U1408 RT8058GQW Richtek Technology

Corporation

1MHz, 2A, Step-Down DC/DC Converter, WQFN-16L 3x3, Green

Y9, Y501, Y502, Y601,

Y602, Y701 NXE25.000AC20F-AHF

NSK Jenjaan Quartek Corporation

Crystal 25MHz 30ppm 20pF -10+70 HC-49 (SMD) H=3.2mm

Y702 FDC500018 PSE Technology

Corporation

Crystal Oscillator 125MHz 30ppm 3.3V 15pF -40+125 5x3.2mm

Q1105, Q1401 BCX5616TA Diodes Zetex Limited Trans NPN, 80V,2A,1W, hfe=100-250,

SOT89

Q1109, Q1407 AO4484 Alpha & Omega N-Ch MOSFET 40V 10A 10mOhm

SO-8

TR5 APL-076 ACUWA AH KE HUA

TEHNOLOGY INC.

10/100/1000 Transformer with PoE support

When you order components for repairing router boards from our sales,

please, write components reference number not a part number

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