MikroTik RB800r2v5 Troubleshooting Manual Download Page 8

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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/

NOPB

NATIONAL

SEMICONDUCTOR [NSC]

3V Under Voltage Detector

(lead free)

U22

LM5020MM-1/NOPB

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

NAOD66.666-C3C

NSK Jenjaan Quartek

Corporation

Crystal oscillator 7*5, +/-30PPM

Y3, Y4, Y5

NXE25.000AC20F-

AHF

NSK Jenjaan Quartek

Corporation

25Mhz Crystal

Summary of Contents for RB800r2v5

Page 1: ... Q7 NOT OK Check N channel MOSFET Q9 Q10 NOT OK Check power controller U22 NOT OK OK OK Change faulty D20 Q4 Change faulty MOSFET Q7 Change faulty MOSFET Q9 Q10 Change faulty controller U22 Change faulty D17 D21 Change faulty D19 D22 U21 Check N ch MOSFET Q5 Change faulty MOSFET Q5 OK NOT OK The board is unrepairable Problem still appears Check resistor R273 It resistance should be 10 Ohm NO 10 Oh...

Page 2: ...ample on C451 Check CPU core voltage 1 0V output for example on C435 pins NOT OK NOT OK OK Check DC DC step down converter U27 Change faulty U27 Check Q12 Q13 U26 Change faulty Q12 Q13 U26 Change faulty oscillator Y1 Check ferrite bead FB8 It resistance should be less than 1Ohm Change faulty ferrite bead FB8 NOT OK OK Check LDO U25 Change faulty U25 NOT OK OK ...

Page 3: ...ty resistors Change faulty TR1 Change faulty U28 NOT OK OK Change faulty FB4 FB5 Change faulty Ethernet PHY U18 Change faulty crystal Y4 Check voltage drop on D5 D8 pin 1 and ground It should be in the range from 0 3V to 0 4V measured in diode mode hold positive wire on the ground and COM wire to D5 pin 1 or you can unsolder diode arrays D5 D8 and try to send traffic over Ethernet port If traffic ...

Page 4: ...nd It should be in the range from 0 3V to 0 4V measured in diode mode hold positive wire on the ground and COM wire to D9 pin 1 Change faulty diode array D9 D11 NOT OK OK Check ferrite beads FB6 FB7 Ferrite resistance should be less than 1 Ohm NOT OK OK Check 25MHz clock on crystal Y5 pins NO 25MHz OK Change faulty ferrite beads FB6 FB7 Change faulty crystal Y5 Change faulty Gigabit Ethernet PHY U...

Page 5: ...positive wire on the ground and COM wire to D1 pin 1 Change faulty diode array D1 D3 NOT OK OK Check ferrite beads FB2 FB13 FB14 Ferrite beads resistance should be less than 1 Ohm Check Ethernet clock 25MHz on R97 pins OK Change faulty FB2 FB13 FB14 Change frequency generator U17 Change faulty Gigabit Ethernet PHY U16 Check Ethernet clock 25MHz on crystal Y3 pins NOT OK Change faulty Gigabit Ether...

Page 6: ... D28 D29 Check MOSFET s Q2 Q3 Check TinyLogic invertor U20 Check ferrite bead FB11 Ferrite bead resistance should be less than 1 Ohm Change faulty PWM step down converter U29 Change faulty FB11 NO 5 7V OK Change faulty D28 D29 Change faulty Q2 Q3 Change faulty U20 OK OK NOT OK NOT OK NOT OK Check 25MHz clock on crystal Y3 Change faulty frequency generator U17 Change faulty FAN Check FAN NOT OK OK ...

Page 7: ... 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 BZX84C10 SOT23 GP SINYORK CO LTD Zener Diode BZX84C10 SOT23 D28 D29 FM2100 SMA GP ...

Page 8: ...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 Cryst...

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