MikroTik RB800r2v5 Mode d'emploi

No power, blue LED doesn’t shine

The board is unrepairable

Check D20, Q4

NOT OK

OKOK

Problem still appears

TroubleShooting for R 800r2v5

PoE doesn’t work

Check bridge rectifiers D17, D21

NOT OK

Check Zener diode D19, D22 and 3V

under vo tage detector U21

NOT OK

Check N-channe MOSFET Q7

NOT OK

Check N-channe MOSFET Q9, Q10

NOT OK

Check power contro er U22

NOT OK

Change fau ty D20, Q4

Change fau ty MOSFET Q7

Change fau ty MOSFET Q9,

Q10

Change fau ty contro er

U22

Change fau ty D17, D21

Change fau ty D19,D22,

U21

Check N-ch MOSFET Q5

Change fau ty MOSFET Q5

NOT OK

The board is unrepairable

Problem still appears

Check resistor R273. It resistance

shou d be 10 Ohm.

NO 10 Ohm

Change fau ty resistor R273

Change fau ty Q6

Check NPN transistor Q6

NOT OK

Doesn’t boot, blue LED is ON

NOT OK

The board is unrepairable

NO 1.8V

Problem still appears

Check 66.666MHz c ock on Y1

pin#3

Check 1.8V output, for

examp e on C451

Check CPU core vo tage 1.0V

output, for examp e on C435 pins

NOT OK

Check DC-DC step down

converter U27

Change fau ty U27

Check Q12, Q13, U26

Change fau ty Q12, Q13,

U26

Change fau ty osci ator

Check ferrite bead FB8. It

resistance shou d be ess

than 1Ohm.

Change fau ty ferrite

bead FB8

NOT OK

Check LDO U25

Change fau ty U25

NOT OK

Ethernet1 doesn’t work, drops ping packets

Check transformer TR1

The board is unrepairable

NOT OK

Problems still appears

Check ferrite beads FB4, FB5.

Ferrite beads resistance shou d

be ess than 1 Ohm

Check Ethernet c ock 25MHz

on crysta Y4

NO 25MHz

NOT OK

Check 1.2V output, for examp e

on C168

Check resistors R152, R153,

R154, R155 resistance. It

shou d be 75Ohm +/-1%

Change faulty resistors

Change fau ty TR1

Change fau ty U28

NOT OK

Change fau ty FB4,

FB5

Change fau ty Ethernet

PHY U18

Change fau ty crysta Y4

Check vo tage drop on

D5, D8 pin#1 and ground.

It shou d be in the range from 0.3V to 0.4V measured

in diode mode (ho d “positive” wire on the ground and

“COM” wire to

D5 pin#1) or you can unso der diode arrays D5, D8

and try to send traffic over Ethernet port. If traffic goes

through port it means that diode arrays was defective

Change fau ty D5, D8

NOT OK

Check ferrite bead FB9. It

is resistance shou d be

ess than 1Ohm

NOT OK

Change fau ty ferrite

bead FB9

Ethernet2 doesn’t work, drops ping packets

NOT OK

Change fau ty connector J13

and Gigabyt Ethernet PHY

U19

Check termination resistance between Tx

and Rx in the connector J13. The

resistance shou d be 150Ohm +/-2%

Check vo tage drop on D9, D11 pin#1

and ground. It shou d be in the range

from 0.3V to 0.4V measured in diode

mode (ho d “positive” wire on the ground

and “COM” wire to D9 pin#1)

Change fau ty diode array

D9, D11

NOT OK

Check ferrite beads FB6, FB7.

Ferrite resistance shou d be ess

than 1 Ohm

NOT OK

Check 25MHz c ock on crysta Y5 pins

NO 25MHz

Change fau ty ferrite

beads FB6, FB7

Change fau ty

crysta Y5

Change fau ty Gigabit

Ethernet PHY U19

The board is unrepairable

Problem still appears

Ethernet3 doesn’t work, drops ping packets

NOT OK

Change fau ty connector J13

and Gigabyt Ethernet PHY

U19

Check termination resistance between Tx

and Rx in the connector J13. The

resistance shou d be 150Ohm +/-2%

Check vo tage drop on D1, D3 pin#1

and ground. It shou d be in the range

from 0.3V to 0.4V measured in diode

mode (ho d “positive” wire on the ground

and “COM” wire to D1 pin#1)

Change fau ty diode array

D1, D3

NOT OK

Check ferrite beads FB2, FB13, FB14.

Ferrite beads resistance shou d be

ess than 1 Ohm

Check Ethernet c ock 25MHz on

R97 pins

Change fau ty FB2,

FB13, FB14

Change frequency

generator U17

Change fau ty Gigabit

Ethernet PHY U16

Check Ethernet c ock

25MHz on crysta Y3 pins

NOT OK

Change fau ty Gigabit

Ethernet PHY U16

NO 1.6V

Check 1.6-1.7V on C160 pins

NO 25MHz NO 25MHz

NOT OK

The board is unrepairable

Problem still appears

MiniPCI-Express doesn’t work

NOT OK

Check 1.5V output, for

examp e on C464

NOT OK

The board is unrepairable

Problems still appears

FAN doesn’t work

Check 5-7V, for examp e

on C433 pins

Check Schottky diodes

D28, D29

Check MOSFET’s Q2, Q3

Check TinyLogic invertor

U20

Check ferrite bead

FB11. Ferrite bead

resistance shou d be

ess than 1 Ohm

Change fau ty PWM

step down converter

U29

Change fau ty FB11

NO 5-7V

Change fau ty D28, D29

Change fau ty Q2, Q3

Change fau ty U20

OKOK

NOT OK

Check 25MHz c ock on

crysta Y3

Change fau ty frequency

generator U17

Change fau ty FANCheck FAN

NOT OK

NO 25MHz

When you order components for repairing router boards from our

sales, please, write components reference number not a part number

Reference

number

Part Number Manufacturer Description

TR1 15F-90NL Yuan Dean Scientific Co.,

Ltd

10/100/1000 Transformer with

PoE support

U16 AR8131-AL1E Atheros Technology Ltd. AR8131, QFN48-04MM, Gbe

NIC, PCIe, 3V

D17, D21 DF02SA-E3/77 Vishay Intertechnology,

Inc. ridge Rectifier, 1A 200V, DFS

J11, J13

F 4, F 6, F 14

R 1-216 AK1A U.D. Electronic Corp.

RJ45 Ethernet connector 10/100/

1000 , LEDs(G/Y), without springs

LM15AG121SN1D Murata manufacturing Co. Ferr Chip eads 120 Om

500mA, 0402, F 120

D1, D3, D5, D8, D9,

D11 AOZ8000CIL Alpha & Omega IC TVS ARRAY LOW-CAP

SOT23-6

Q9, Q10 AO4484 Alpha & Omega

N-Ch MOSFET 40V 10A 10mOhm

SO-8

F 2, F 13 LM15AG121SN1D Murata manufacturing Co. Ferr Chip eads 120 Om

500mA, 0402, F 120

F 5, F 7 LM15PD121SN1D Murata manufacturing Co. Ferr Chip eads 120 Ohm

±25%, 1300mA, 0402

R273 ERJ-2RKF10R0X Panasonic

Resistor R10, 1%, 1/16W, 50V,

0402

Q4, Q5, Q7 FDD3682 Fairchild Semiconductor

[FSC] 100V, 32A, 36mOHM, 18.5nQ

Q12, Q13 AP4434GM Advanced Power

Electronics Corp.

N-ch MOSFET 20V 18.5mOhm

8.3A SO-8

U18, U19 AR8021-AL1E Atheros Technology Ltd. Single-port Gigabit Ethernet

(GbE) PHY device

D20 ZX84C10/SOT23-GP SINYORK CO., LTD. Zener Diode ZX84C10 SOT23

D28, D29 FM2100/SMA-GP SINYORK CO., LTD. Diode Schottky FM2100

Vf=0.85V Vr=100V If=2A SMA

Q2, Q3 2N7002,215 NXP Semiconductors TRENCH MOSFET, SOT23

R152-R155 RC0603FR-0775RL Yageo Corporation

Resistor 0603 75,0R 1% 0,1W

U17 ICS9FG108DGLFT IDT

Frequency Generator for CPU,

QPI, F D, PCIe & SATA, TSSOP48

U20 NC7S04M5X Fairchild Semiconductor

[FSC] 1 TinyLogic HS Inverter

D19 ZX84C6V8LT1G ON Semiconductor Diode Zener ZX84C 6.8V 5.9%

225mW SOT23

F 8, F 9 LM18PG331SN1D Murata manufacturing Co. Ferr Chip eads 330 Om

1200mA, 0603

F 11 RC1608J000CS Samsung Electronics Co. Resistor 0R 5% Jumper 0603

D22 ZX84C6V8LT1G ON Semiconductor Diode Zener ZX84C 6.8V 5.9%

225mW SOT23

Q6 CP56-16T1G ON Semiconductor NPN Silicon Epitaxial

Transistor

When you order components for repairing router boards from our

sales, please, write components reference number not a part number

Reference

number

Part Number Manufacturer Description

U21 LMS33460MGX/

NOP

NATIONAL

SEMICONDUCTOR [NSC]

3V Under Voltage Detector

(lead free)

U22 LM5020MM-1/NOP NATIONAL

SEMICONDUCTOR [NSC] Power Controller MSOP10

U25 RT9183HPS Richtek Technology

Corporation 1.5A Adj LDO SO8

U26 TPS40009DGQ Texas Instruments 600kHz, 2.25-5.5Vin/0.7-5.0Vout

U27, U28 RT8011APQW Richtek Technology

Corporation

DC-DC Step down converter,

WDFN-8E

U29 RT8010APQW Richtek Technology

Corporation

High Efficiency PWM Step-

Down DC/DC Converter

Y1 NAOD66.666-C3C NSK Jenjaan Quartek

Corporation Crystal oscillator 7*5, +/-30PPM

Y3, Y4, Y5 NXE25.000AC20F-

AHF

NSK Jenjaan Quartek

Corporation 25Mhz Crystal

R 800r2v5 Reference picture

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