rb1100 repair manual

TroubleShooting for RB1100r3

Change faulty ferrite bead

Check Zener diode

D1103

NOT OK

OK

Check ferrite bead FB1101 resistance.

It should be less than 1Ohm

The board is unrepairable

Problem still

appears

Check P-channel

MOSFET Q1102Change faulty MOSFET

NOT OK

Check Schottky diode

D1101Change faulty diode

NOT OK

OK

Change faulty components

Check N-channel MOSFETs

Q1103, Q1108 and Q1109Change faulty MOSFETs

NOT OK

Check resistor R1149 resistance.

It should be 10 OhmChange faulty resistor

NOT OK

Check PNP transistor Q1101

and Zener diode D1104

No power, blue LED is not lit

Check Buck controller

U1101Change faulty controller

NOT OK

OK

OK

Check 5.0V output on

NPN transistor Q1105 pin#3

NO 5.0V

Change faulty Zener diode

OK

OK

OK

Check Zener diode D1106

NOT OK

OK

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

NOT OK

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

OK

OK

OK


Problem still

appears

PoE does not work

Check Rectifier Bridges

D1102, D1105Change faulty Bridges

NOT OK

Check Ethernet connector

J5Change faulty connector

OK

NOT OK

Problem still

appears


Change faulty Step-Up

DC-DC converter U1402

RB does not boot,

green and blue LEDs are lit


Change faulty oscillator

Problem still

appears

Change faulty Buck

controller U1102

Change faulty MOSFET

Check 1.8V output,


Check 1.0V CPU core output,


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

NOT OK

Change faulty resistor

Change faulty MOSFETs

NOT OK

Check 5.0V output on

NPN transistor Q1401 pin#3

OKChange faulty Buck

controller U1406

Change faulty NPN transistor

Q1401 and Zener diode D1402

NOT OK

Check 2.5V output,


NO 2.5V

Change faulty LDO U1410

OK

NOT OK

OKNO 1.8V

Check 0.9V output

on Termination Regulator U1103 pin#4

NO 0.9V

Change faulty Termination Regulator

OK

OK

OK

NO 66MHz clock


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 Y501Change faulty crystal

NO 25MHz


It should be less than 1 OhmChange faulty ferrite bead

NOT OK

OK


It should be less than 1 Ohm

Check 25MHz clock

on crystal Y502

OK

OK

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

OK


NO 25MHz

NOT OK


OK

OK

Try to change Frequency

generator U502

OK


Problem still

appears

Change faulty diode arrays

Check connector J601 for mechanical damages


It should be less than 1 OhmChange faulty ferrite bead

NOT OK

OK

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

OK


It should be less than 1 Ohm

NOT OK


Check 25MHz clock on crystal Y602 Change faulty crystal

NO 25MHz

Change Ethernet Gigabyte NIC U602

OK

OK

OK

OK

Change faulty Ethernet port J601

OK

For

Port

2

For

Port

3

NOT OK

NOT OK

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

drops ping packets


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

OK

Check ferrite beads FB901, FB902, FB903, FB904, FB905

resistance. Each resistance should be less than 1 Ohm

NOT OK


Check 1.6V output,


OK

NO 1.6V

Check ferrite beads FB1403, FB1405 resistance.

Each resistance should be less than 1 Ohm

NOT OK


Change faulty DC-DC Step Down

Converter U1405

OK

Check 1.05V output,


NO 1.05V




NOT OK

OKChange faulty DC-DC Step Down

Converter U1408

OK

Check ferrite beads FB1001-

FB1006 resistance.

Each resistance should be

less than 1 Ohm

NOT OK


OK

Change faulty 6-port GbE Switch U9

Check 25MHz Ethernet clock

on crystal Y9 pins

NO 25MHz


OK


Problem still

appears

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

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

NOT OK

OK

OK

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

drop ping packets


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

OK

Check ferrite beads FB701, FB702, FB703, FB704, FB705

resistance. Each resistance should be less than 1 Ohm

NOT OK


Check 1.6V output,


OK

NO 1.6VCheck ferrite beads FB1403, FB1405 resistance.

Each resistance should be

less than 1 Ohm

NOT OK


Change faulty DC-DC Step Down

Converter U1405

NOT OK

OK

Check 1.05V output,


NO 1.05V




NOT OK

OKChange faulty DC-DC Step Down

Converter U1407OK

Check ferrite beads FB801- FB806

resistance. It should be

less than 1 Ohm

NOT O

K


OK

Change faulty 6-port GbE Switch

U701

Check 25MHz Ethernet clock on

crystal Y701 pins

NO 25M

Hz


OK


Problem still

appears

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

OK

Reference

numberPart Number Manufacturer Description

D1101 SK36-T3-LFWon-Top Electronics Co.,

Ltd. Diode Schottky 60V 3A SMC

D1103 BZX84C10-T1-LFWon-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

BLM15AG121SN1DMurata manufacturing

Co.

Ferr Chip Beads 120 Om 500mA,

0402, FB120

J701-J705, J901-J905 ARB-1FAK-F235-BSuper 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-LFWon-Top Electronics Co.,

Ltd. Diode Schottky 60V 3A SMA

FB506, FB604, FB606 BLM15AG121SN1DMurata manufacturing

Co.


0402, FB120

FB807, FB1405 BLM18SG121TN1DMurata manufacturing

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

FB808 BLM18EG221SN1DMurata manufacturing

Co.Ferr Bead 220 Ohm, 2A, 0603

FB1101FBMA-11-453215-

900A90T

King Core Electronics

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

FB1403, FB1409,

FB1411BLM18PG331SN1D

Murata manufacturing

Co.


0603

J5 8108-B114Powerway Electronics

Co., LTD.

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

soldered shielding pins

J601 AR6-2DHD-1234-BSuper 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 & OmegaP-Ch MOSFET -60V -4A 100mOhm

SO-8

Q1104 AP9960GMAdvanced Power

Electronics Corp.

N-channel Dual MOSFETs,Vds = 40V,

Id = 7.8A, Rdson = 20mOhm, SO-8

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

Transistor

Q1103, Q1108, Q1405,

Q1406AO4484 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

Reference

numberPart 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 IDTFrequency 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 RT8209BGQWRichtek Technology

Corporation

Synchronous Buck

Controller,Vin=4.5...26V, WQFN-

14L_3.5x3.5

U1103 AIC1384-GSHTRANALOG INTEGRATIONS

CORPORATIONDDR2 Termination Regulator, PSOP-8

U1402 RT9297GQWRichtek Technology

Corporation

WDFN-10L_3x3, Vin=2.6...5.5V,

Vout_max=24V, Ilim=3A,

f=0.64MHz|1.2MHz

U1410 RT9183HPSRichtek Technology

Corporation1.5A Adj LDO SO8

Y4 FN6660077PSE Technology

Corporation

Crystal Oscillator 66.666MHz

25ppm 3.3V 15pF -55+125 7x5

U1405, U1407, U1408 RT8058GQWRichtek Technology

Corporation

1MHz, 2A, Step-Down DC/DC

Converter, WQFN-16L 3x3, Green

Y9, Y501, Y502, Y601,

Y602, Y701NXE25.000AC20F-AHF

NSK Jenjaan Quartek

Corporation

Crystal 25MHz 30ppm 20pF -10+70

HC-49 (SMD) H=3.2mm

Y702 FDC500018PSE Technology

Corporation

Crystal Oscillator 125MHz 30ppm

3.3V 15pF -40+125 5x3.2mm

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

SOT89

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

SO-8

TR5 APL-076ACUWA 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

RB1100r3 Reference picture

RB1100r3 Output Voltage picture

rb1100 repair manual

Documents

faulty diodenot okno

faulty pll clock driver

zener diode d1402not

d501 pin

npn transistor q1401

diode mode

npn transistor q1105

d503 pin