Samsung MC26AC2X Service Manual download pdf (Page 27)

Samsung Electronics5-2

5-2 Fault Diagnosis by Symptom

5-2-1 No Power (completely dead)-Initial diagnosis

1) Checklist :

(1) Is input voltage normal?

(2) Is AC power linked correctly?

(3) Is output voltage of DC regulator IC KA78L05 (IC02) normal? (4.5VDC-5.5VDC)

2) Troubleshooting procedure

Replace

PCB display

Is DC voltage of PCB

display normal?

Remove power cord and plug in

again in approx. 5 seconds

Is operation lamp blinking?

Does operation start when

ON/OFF button on the remote

controller unit pushed?

Is transmission display of the

remote controller unit blinking?

Is "beep"sound heard from the main

unit?

Is DC voltage of the PCB module

normal?

Are voltages of #33 (compressor),

of the micom normal? 5VDC

Is voltage of #32 (indoor fan) of the

micom normal?

Is voltage at #10 terminal of the Micom normal?

0VDC

Is voltage at #9 terminal of the Micom normal?

5VDC

Is rating voltage ±10% range

applied to the primary side(~,~)

of the “BD71”

•Check linkage between

power cord and

terminal tap

•Check fuse

Is 325VDC appear in the

secondary side (+, -)

of “BD71”

Replace

SMPS PARTS

YES

DC5V

10ms

250ns

YES

Normal

Refer to remote control

unit fault diagnosis

Replace PCB

module.

Is output voltage of ICO2 normal?

Check connections

compressor and

indoor fan.

Are voltages at RY71(Compressor) normal?

DC12V Is voltage at SS71(indoor fan)

Replace

RY71 and SS71

Is voltage output terminal of

PC814(PC02) normal?

Replace ICO2

Check PCB pattern.

Replace main PCB.

Replace PC814(pc02)

Replace

micom

Is voltage at #3 terminal of the micom

normal?

Are voltage at #11 and #12 of the

micom normal?

YESNO

YES

Is operation normal?

Replace resonator (X301)

DB98_11868A(1)_1 3/3/03 11:17 AM Page 2-24

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Samsung MC26AC2X Service Manual Page 27

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