Abnormal Diagnosis By Symptom - Samsung AQ09A5(6)MAF Service Manual

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Troubleshooting (cont'd)

2 Abnormal diagnosis by symptom

I AQ09A5(6)MAF
1. No Powe r
1. No Powe r
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
YES
Is DC voltage of PCB
display normal?
Is voltage rating within ±10%
Replace PCB
range applied to the primary
display
side(~,~) of the "BD71"?
Check linkage between
a power cord and
Check fuse
Does 325VDC appear in
the secondary side (+, -)
Replace
SMPS PARTS
Replace resonator (X301)
Is operation normal?
14
- Initial diagnosis
- Initial diagnosis
Remove the power cord and plug in
again in approx. five seconds
NO
Does it start operating when
NO
Is transmission display of the
remote control unit blinking?
Does the 'beep' sound from the
NO
NO
Is DC voltage of the PCB module
a terminal tap
Are voltages of #33 (IC04 : compressor),
#36 (IC04 : 4-way valve) and #34 (IC04 :
outdoor fan) of Micom normal? 5VDC
Is voltage of #32 (IC04 : indoor fan) of
of "BD71"?
DC5V
NO YES
Is voltage of #10 (IC04) terminal of Micom normal?
Is voltage of #9 (IC04) terminal of Micom normal?
Is voltage of #3 (IC04) terminal of
Are voltages of #12 (IC04) and
#11 (IC04) of Micom normal?
NO
NO
YES
OK
Does the lamp blink?
YES
YES
you push the On/Off button
on the remote control?
NO
NO
YES
main unit?
YES
NO
normal?
YES
YES
Micom normal?
10ms
NO
0VDC
5VDC
NO
YES
Micom normal?
10ms
YES
NO
250ns
YES
Replace
Micom
Normal
Refer to remote control
unit abnormal diagnosis
Replace PCB
module
Are voltages of RY71(Compressor)
normal? DC12V
Is voltage of SS71(indoor fan)?
YES NO
Check connections
Replace
of compressor
RY71 and
and indoor fan
SS71
Is output voltage of ICO2 normal?
NO
YES
Check PCB pattern
Replace ICO2
Replace the main PCB
Is voltage output terminal of
PC814A (PC02) normal?
YES NO
Replace PC814A(PC02)
OK