MikroTik RBSXTG-5HPnD Series Einrichtungshandbuch

Repair instruction

RBSXTG-5HPnD

Published June 8, 2015

These repair instructions are for NON WARRANTY repairs only!
Please make visual inspection for signs of corrosion
or mechanical damages before starting 
Contents
List of RBSXTG-5HPnD series............................................................................................3
Disassembling information.................................................................................................4
Routerboar   oes not power on........................................................................................6
Routerboar   oes not boot...............................................................................................10
Ethernet port  oes not work.............................................................................................12
Voltage an  temperatur monitor  oes not work.............................................................13
USB  oes not work............................................................................................................14
WiFi  oes not work............................................................................................................16
2 Latest Checking procedure for over-voltage da age available at www. ikrotik.co 

List of Clou Router Switch SXT 5 series

SXT HG5

SXT SA5

List of Cloud Router Switch SXT 5 series 3

Disassembling information

1. Use two “-” screwdrivers. Push screwdrivers in case cavities.

2. Rotate screwdriver and pull both case parts.

4 Disasse bling infor ation

3. Remove rubber bushing

4. Push back Plastic PCB holders and take out the board.

Routerboar oes not power on

There no signs of any LE , LC or buzzer activity

Find potential problem area

RouterBOARD does not turn on when one o the power is disconnected. Check Which voltage is

switched o , Power IN (10 – 28V), 3.3V or 5V.

6 Routerboard does not power on

GND

Power IN

3.3V

If Power_IN Failed

1. No power on 10-28V input

Routerboard does not power on 7

Check for 10-28V output

on C27

Try to use different

PSU adapter

Problem solved Measure if there is no short

between GN and C27 “+” pin

Change C27, C428

Measure Voltage

on Q1 pin 1-3

Change Q1 Check if ferrite bead FB1 is OK

Change FB1

Measure Voltage drop

over 3 and 4

Check Voltage on 404

and 405 at TRF401 side

Change 3 and 4

Change Q2

Change 404

and 405

Change TRF401

OK Not OK

Short

No short

0V10-28V

OK Not OK

0.7V> 0.7V

0V10-28V

2. No Voltage on 3.3V output

3. No Voltage on 5V output

8 Routerboard does not power on

Check for 3.3V output

on L1

Measure if there is no

short between GN and L1

Change C8Measure L1 resistance

Measure resistance on R2

(26.1k Ohms) and R3 (10k Ohms)

Change L1

Change U1 Change R2, R3

ShortNo short

>1 Ohm<1 Ohm

Not OK

Check for 5.0V output

on L2

Measure if there is no

short between GN and L2

Change C42Measure L2 resistance

Measure resistance on R6

(44.2k Ohms) and R8 (10k Ohms)

Change L2

Change U1 Change R6, R8

ShortNo short

>1 Ohm<1 Ohm

Not OK

4. Supply voltage components location on RouterBOAR

5. Supply voltage Components table

Routerboard does not power on 9

D428

C27

D404;

D405

TRF401

L1 C8

C27

C42

Reference Manufacturer co e Description Manufacturer

C27 MG035M331G13PKKKS00R Capacitor elec 330uF 20% 35V 10x13 TH P=5 6000h 1.36A 0.043Ohm MG-series KUAN KUN ELECTRONIC ENTERPRISE CO., LT . (Su-scon)

C8, C42 UCW0J471MNL1GS Capacitor elec 470uF 20% 6.3V 8x10 SM 7000h 600mA CW-series NICHICON CORPORATION

3 BZX84C10-T1-LF iode Zener BZX84C 10V 5% 225mW SOT23 iodes Zetex Limited

4 BZX84B30-AU_R1_000A1 iode Zener BZX84B 30V 2% 400mW SOT23 PanJit International Inc.

404, 405 SR210-T3-LF iode Schottky 100V 2A SMA Won-Top Electronics Co., Ltd.

L1, L2 BCRH8 43-100N-NL Inductor 10uH 30% 3.6A 8.3x8.3x4.7 34mOhm RoHS T&R Bao Cheng Electronics Co.,Ltd.,

Q1 AO4441 Transistor MOSFET P-Ch -60V -4A 100mOhm 3W SO-8 Alpha & Omega

Q2 BC856B,215 Transistor PNP -65V -100mA 250mW Hfe=220-470 SOT-23 RoHS NXP Semiconductors

R2 RC0402FR-0726K1L Resistor 26.1k 1% 0402 Yageo Corporation

R3, R8 RC0402FR-0710KL Resistor 10k 1% 0402 Yageo Corporation

R6 RC0402FR-0744K2L Resistor 44.2k 1% 0402 Yageo Corporation

TRF401 NS602462 10/100/1000 Single Ethernet transformer SM 24pin RoHS T&R Feei Cherng Enterprise CO., LT .

U1, U2 LSP5526-S8A C- C Step-down converter 4.5-30V input 2A output Sync SO8, RoHS Lite-On Semiconductor corporation

Routerboar oes not boot

If Netinstall can see the boar , but can not install it

1. Troubleshooting flow chart

10 Routerboard does not boot

Measure inductor L103 resistance

Change defective

L103

Check 1.8V output on

transistor Q200 pin2

Change Q200

Measure ferrite bead

FB200 resistance

Change FB200

Change NAN

flash U300

Change 25MHz Crystal Y700

Change resistors R303, R305,

R306, R307, R308, R310, R311, R312

Change RAM U200

Change CPU U100

Ohm

1.8V 0V

Problem still

appears

Problem still

appears

Problem still

appears

Problem still

appears

On U100 CPU silcscreen must be the same product code,

or You will lose the license. License may also lose if changes U901

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