Samsung AQ07ACVE, Руководство по обслуживанию

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Samsung Electronics
5-2
5-2 Fault Diagnosis by Symptom
5-2-1 No Power (completely dead)-Initial diagnosis
1) Checklist :
(1) Is input voltage normal? (198-264V~)
(2) Is AC power linked correctly?
(3) Are connections between primary side, secondary side of the power transformer and PCB good.
(4) Is output voltage of DC regulator IC KA7812 (IC01) normal? (11VDC-12.5VDC)
(5) Is output voltage of DC regulator IC KA7805 (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
run/stop 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 #57 (compressor),
#55(4 way valve) and #61 (outdoor
fan) of the micom normal? 5VDC
Is voltage of #60 (indoor fan) of the
micom normal?
Is voltage at #33 terminal of the Micom normal?
0VDC
Is voltage at #18 terminal of the Micom normal?
5VDC
Is 198~264VAC
applied to the
between TB71
and #4 of RY71
•Check linkage
between
power cord and
terminal tap
•Check fuse
•Is 11~12.5 VDC appear in
the input side of the DC reg-
ulator IC KA7805(IC02)?
Refer to Replace PCB module
YES
NO
YES
NO
YES
YES
YES
NO
YES
YES
YES
DC5V
10ms
10ms
10ms
100ms
NO
NO
OK
YES
YES
YES
YES
NO
NO
YES
Normal
Refer to remote control
unit fault diagnosis
Refer to Replace
PCB module.
Is output voltage of ICO2 normal?(5VDC)
Check connections
compressor, 4-way
valve, outdoor fan
and indoor fan.
Are voltages at
RY71(Compressor) RY74(4-way
valve) and RY72(outdoor fan)
normal? DC12V Is voltage at
SS71(indoor fan)
Replace
RY71,
RY73,
RY72 and
SS71
NO
NO
NO
Is voltage output terminal of
PC12(#3, #4)
normal?
Replace
ICO2
Check PCB pattern. Refer
to Replace PCB module.
Replace PC12
Replace
micom
Is voltage at #52 terminal of
the micom normal?
Are voltage at #48 and #49 of
the micom normal?
NO
NO
NO
YES NO
NO
NO
YES
OK
Is operation normal?
Replace resonator (X501)
TSH00-9 5/31/01 1:57 PM Page 5-2