MikroTik RB433r3 Operating instructions

TroubleShooting for RB433r3, RB433Ur2

These repair instructions are for NON WARRANTY

repairs onl !

No power, blue LED isn’t lit

Please make visual inspection for signs of corrosion or

mechanical damages before starting.

Check Schottky diode D802 Change faulty diode D802

NOT OK

Check Zener diode D804

Change faulty components

Check PNP transistor Q802 and

Zener diode D80

NOT OK

Check P-channel MOSFET

Q801

NOT OK

Change faulty P-channel

MOSFET Q801

Check R819 resistor resistance.

It should be 10 Ohm

NO 10 Ohm

Change faulty resistor

R819

Check PWM controller U80 .

On the pin#1 should be 4.4-

5.0V

NOT OK

Change faulty PWM

controller U80

Check N-channel MOSFET’s

Q806, Q808

NOT OK

Change faulty MOSFET’s

Check short circuit on 1.8V,

for example, on C612 pins

Short circuit

Unsolder Ethernet Switch U601

and check 1.8V for short circuit

Change faulty Ethernet

Switch U601

The board is unrepairable

Problem still

appears

Doesn’t boot, green and blue LEDs are lit

Check 2.5V output, for

example, on C841 pins

NOT OK

Change faulty N-channel

MOSFET Q807

NOT OK

Check voltage on PWM controller

pin#7 (PGOOD). It voltage should

be . V

NO 3.3V

Check PWM controller

U80

Check resistor R 07

resistance. It resistance

should be 68KOhm.

Check 40.000MHz clock on oscillator

Y 01 pin#

Change faulty oscillator

Y 01

NOT OK

The board is unrepairable

Problem still

appears

Change faulty RAM U201, U202

Check 1.2V CPU core output, for

example, on C848 pins

NO 1.2V

Change faulty ferrite bead

FB801

Check Step Down DC-DC

convector U806

Change faulty Step Down

convector U806

NOT OK

Check ferrite bead FB801. It

resistance should be less than

1 Ohm

PoE doesn’t work

Check Schottky diode

D801

NOT OK

Change faulty diode

D801

Check Ethernet

connector J601

NOT OK

Change faulty

connector J601

The board is unrepairable

Problem still

appears

Check N-channel MOSFET

Q807

Ethernet doesn’t work

Check termination resistance between Tx and

Rx lines in the each Ethernet connector J601,

J602, J60 . It should be 150 Ohm +/-2%

Change faulty connectors

Check voltage drop between D601, D602 or

D60 pin#1 and Ground. This value should

be in the range from 0.4 – 0.5V measured

in diode mode (hold “positive” wire on the

ground and “COM” wire to D601 pin#1)

NOT OK

OKOK

Change faulty Ethernet

Switch U601

Check ferrite beads FB602 (for J601),

FB604 (for J602), FB60 (for J60 ). It

resistance should be less than 1 Ohm

Change faulty ferrite beads

NOT OK

Check 1.8V output, for example, on

PNP transistor Q601 pins

No 1.8V

Check Q601 transistor

NOT OK

Change faulty Q601

Change faulty U601

Check 25.000MHz clock on crystal

Y601

NO 25.000 MHz

Change faulty Y601

Problem still appears

The board is unrepairable

When ou order components for repairing boards from our sales, please,

write components reference number not a part number

Reference

number

Part Number Manufacturer Description

J601, J602, J603 ARA-1DKK-G565-B Super Link Electronics

Co., Ltd.

RJ45 10/100 with LEDs and

direct POE output,pre-soldered

shielding pins

D801, D802 FM2100/SMA-GP SINYORK CO., LTD. Diode Schottk FM2100

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

Q601 STD888T4 STMICROELECTRONICS

Medium Current, High Performance,

Low Voltage PNP Transistor

D601, D602, D603 AOZ8000CIL Alpha & Omega IC TVS ARRAY LOW-CAP

SOT23-6

D804 BZX84-B27,215 NXP Semiconductors Diode Zener BZX84B 27V 2%

350mW SOT23

FB602, FB603, FB604 BLM15AG121SN1D Murata manufacturing Co. Ferr Chip Beads 120 Om

500mA, 0402, FB120

D803 BZX84C10/SOT23-GP SINYORK CO., LTD. Diode Zener BZX84C 10V 6%

410mW SOT23

R307 RC0402FR-0768KL Yageo Corporation

Resistor 68k 1% 0402

Q807 AOD480 Alpha & Omega

N-Ch MOSFET 30V 25A 23mOhm

DPAK

Q802 BC856B,215 Philips AG

Small Sign PNP 250mW SOT-23

Transistor

Q801 AO4441

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

SO-8

FB801 BLM18PG331SN1D Murata manufacturing Co. Ferr Chip Beads 330 Om

1200mA, 0603

Q806, Q808 AO4484 Alpha & Omega

N-Ch MOSFET 40V 10A 10mOhm

SO-8

R819 ERJ-2RKF10R0X Panasonic

Resistor 10R 1% 0402

U601 (for RB433r3) IP175DLF IC Plus Corp. 5Port 10/100 Ethernet Integrated

Switch

U806 RT8010APQW Richtek Technolog

Corporation

High Efficienc PWM Step-

Down DC/DC Converter

U803 RT9206PS Richtek Technolog

Corporation Power Controller SOP-16

Y301 NAOD40.000-C3C NSK Jenjaan Quartek

Corporation 40MHz 3.3V Oscillator 30ppm

Y601 NXE25.000AC20F-AHF NSK Jenjaan Quartek

Corporation 25Mhz Cr stal

U201, U202 NT5DS16M16CS-5T NANYA TECHNOLOGY

CORPORATION

DDR SDRAM 256Mbit DDR400 16M

x 16bit TSOP-66 RoHS

U601 (for RB433Ur2) IP175CLF IC Plus Corp. 5 Port 10/100 Switch with MII

RB433r3 Reference picture

RB433r3 Output Voltage picture

This manual suits for next models

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