MikroTik RB450G Mode d'emploi

TroubleShooting for RB450G

No power, blue LED doesn’t shine

Change faulty MOSFET

Check P-channel MOSFET

Q801

Check Zener diode

803

N T K

K K

The board is unrepairable

Problem

still appears

Check Schottky diode

802

Change faulty Schottky diode

N T K

Check resistor R819 resistance.

It should be 10 Ohm

Change faulty resistor

N T K

Change faulty components

N T K

Check PWM controller

U803 Change faulty controller

N T K

These repair instructions are for N N WARRANTY repairs only!

Please make visual inspection for signs of corrosion

or mechanical damages before starting.

Check PNP transistor Q802

and Zener diode 804

N T K

Change faulty MOSFET

Check N-channel ual MOSFET

Q806

N T K

RB doesn’t boot, green and blue LED’s is shine

The board is unrepairable

Change faulty crystal oscillator

NO 40MHz

Problem

still appears

Change faulty ferrite beads

Check 2.5V output,

for example on C849 pins

Check C U core 1.2V output,

for example on C853

Check 40MHz clock on crystal

oscillator Y301 pin#3

Check ferrite beads FB801, FB806

resistance. It should be less than 1 Ohm

Change faulty DC-DC Step-Down

converter U805

NO 2.5V NOT OK

Check ferrite beads FB802, FB803

resistance. It should be less than 1 Ohm

NO 1.2V

Change faulty DC-DC Step-Down

converter U806

Try to change RAM memory

U201-U204

PoE does not work

Change faulty diode bridges

Check diode bridges

D805, D806

NOT OK

Change faulty connector

Check connector

J504

NOT OK

The board is unrepairable

Problem

still appears

Change faulty ferrite beads

NOT OK

OKOK

Try to change processor

Change faulty ferrite beads

Check ferrite beads FB701, FB702 resistance.

It should be less than 1 Ohm

NOT OK

Change faulty ferrite beads

Ethernet port1 (J504) does not work,

drop ping packets

The board is unrepairable

Problem

still appears

Check 1.0V output,

for example on C619

NO 1.0V

Change faulty transistor Change faulty ferrite beads

Check voltage drop between diode arrays D507, D508

pin#1 and Ground. This value should be in the range from

0.21V to 0.26V measured in diode mode (hold “positive”

wire on the Ground and “COM” wire to D507 pin#1)

Change faulty diode arrays and

6-port GbE Switch U501

NOT OK

Check 1.5V output,

for example on C841 pins

Change faulty ferrite beads

NO 1.5V

Check ferrite bead FB501 resistance.

It should be less than 1 Ohm Change faulty ferrite bead

NOT OK

Change faulty connector

Check transformer

TR501

NOT OK

Check resistors R563-R566 resistance.

It should be 75 Ohm +/-1%

Change faulty resistors

NOT OK

Check ferrite beads FB804, FB805

resistance. It should be less than 1 Ohm

NOT OK

Change faulty DC-DC Step-Down

converter U807

Check N

transistor Q601

Check ferrite beads FB601,

FB602, FB604-FB607 resistance.

It should be less than 1 Ohm

Change faulty 6-port

GbE switch U501

Check 25MHz clock on

R541 pins

NOT OK

Change faulty Network processor

OK OK

NOT OK

Ethernet ports 2(J501), 3(J505), 4(J503), 5(J502)

do not work, drops ping packets

The board is unrepairable

Problem

still appears

Change faulty connectors

Check 1.0V output,

for example on C619

NO 1.0V

Change faulty transistor Change faulty ferrite beads

Check voltage drop between diode arrays D501-D506,

D509, D510 pin#1 and Ground. This value should be in the

range from 0.21V to 0.26V measured in diode mode (hold

“positive” wire on the Ground and “COM” wire to D501

pin#1)

Change faulty diode arrays and

6-port GbE Switch U501

NOT OK

Check 1.5V output,

for example on C841 pins

Change faulty ferrite beads

NO 1.5V

Check ferrite beads FB502-FB505 resistance.

It should be less than 1 Ohm Change faulty ferrite bead

NOT OK

Check termination resistance between Tx

and Rx lines in the each Ethernet connector.

It should be 150 Ohm +/- 2%

NOT OK

Check ferrite beads FB804, FB805

resistance. It should be less than 1 Ohm

NOT OK

Change faulty DC-DC Step-Down

converter U807

Check N transistor

Q601

Check ferrite beads FB601,

FB602, FB604-FB607 resistance.

It should be less than 1 Ohm

Change faulty 6-port

GbE switch U501

Check 25MHz clock on

R541 pins

NOT OK

Change faulty Network processor

OK OK

NOT OK

Reference

number

Part Number Manufacturer Description

J501-J503, J505 RB1-216BAK1A U.D. Electronic Corp. RJ45 10/100/1000 w/LED

w/Shield TD TH

Q802 BC856B,215 NXP Semiconductors Transistor PNP -65V -100mA

250mW Hfe=220-470 S T-23

D802 SX36-T3-LF Won-Top Electronics Co.,

Ltd.

Diode Schottky 60V 3A

SMA

FB501-FB505, FB601,

FB602, FB604-FB607,

FB701, FB702

D804

BLM15AG121SN1D Murata manufacturing Co. Ferrite Bead 120 hm 500mA

0402

BZX84B27-AU T/R 7" PanJit International Inc. Z-DI DE 0.41W 27V 2%

S T23

D501-D510 A Z8000CIL Alpha & mega IC TVS ARRAY L W-CAP

S T23-6

Q601 STD888T4

STMICR ELECTR NICS A. P

Transistor PNP -30V -5A 15W

Hfe=300 D-PAK

D803 BZX84C10-T1-LF Won-Top Electronics Co.,

Ltd.

Diode Zener BZX84C 10V 5%

225mW S T23

D805, D806 DB153S SINY RK C ., LTD. Diode bridge 200V 1.5A

DBS

FB803 WR06X000 PTL Walsin Technology Resistor 0R

0603

FB804, FB806 BLM18SG121TN1D Murata manufacturing Co. Ferrite Bead 120 hm 3A

0603

J504 8108-B114

Powerway Electronics Co.,

LTD

RJ45 w/LED w/Shield TD TH

w/oEMI TinPlated

Q801 A 4441 Alpha & mega Transistor M SFET P-Ch -60V -

4A 100m hm 3W S -8

Q806 AP9960GM Advanced Power

Electronics Corp.

Transistor M SFET N-Ch Dual

40V 7.8A 20m hm S -8

R563 - R566

CRCW060375R0FKTAB

Vishay Intertechnology,

Inc.

Resistor 75R 1%

0603

FB801, FB802, FB805 BLM18PG331SN1D Murata manufacturing Co. Ferrite Bead 330 hm 1.2A

0603

R819

CRCW040210R0FKTDB

Vishay Intertechnology,

Inc.

Resistor 10R 1%

0402

TR501 LCZ3N1ZB Cetus International Ltd. 10/100/1000 Single Ethernet

transformer SMD

U1 AR7161-BC1A Atheros Technology Ltd. 600MHz Network Processor

(LF-AR7100X chipset)

U201 – U204 NT5DS64M8CS-5T

Nanya Technology Europe

GmbH

DDR SDRAM 512Mbit DDR400

64Mx8bit TS PII-66

When you order components for repairing boards from our sales,

please, write components reference number not a part number

U501 AR8316-AK1E Atheros Technology Ltd. 6-port GbE Switch

U803 RT9206PS Richtek Technology

Corporation Power Controller S P-16

U805 - U807 RT8011APQW

Richtek Technology

Corporation

DC-DC Step down converter,

WDFN-8E

Y301

NA D40.000-C3C-CI4 NSK Jenjaan Quartek

Corporation

Crystal scillator 40MHz

30ppm 3.3V 15pF 0+70 7x5

RB450G Reference picture

RB450G utput Voltage picture

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