Samsung AS070VE, 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 corre c t l y ?
(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? (11 V D C - 1 2 . 5 V D C )
(5) Is output voltage of DC regulator IC KA7805 (IC02) normal? (4.5VDC-5.5VDC)
2 ) Troubleshooting pro c e d u re
Replace
PCB display
Is DC voltage of PCB
display normal?
Remove power cord and plug in
again in approx. 5 seconds
Is o peration 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 #62 (compressor),
#60(4 way valve) and #61 (outdoor
fan) of the micom normal? 5VDC
Is voltage of #63 (indoor fan) of
the micom normal?
Is voltage at #32 terminal of the Micom
normal? 0VDC
Is voltage at #64 terminal of the Micom
normal? 5VDC
Is 198~264VAC
applied to the
primary side of the
power transformer?
•Check linkage
between
power cord and
terminal tap
•Check fuse
Is 14~18VAC appear in
the secondary side of
the power transformer?
Replace power
t r a n s f o rm e r
YES
NO
YES
NO
YES
YES
YES
NO
YES
YES
YES
DC5V
10ms
10ms
100ns
NO
NO
OK
YES
YES
YES
YES
NO
NO
YES
Normal
Refer to remote control
unit fault diagnosis
Replace PCB
module.
Is output voltage of ICO2 normal?
Check connections
compressor 4-way
valve, outdoor fan
and indoor fan.
Are voltages at RY71
(Compressor) RY73(4-way valve)
and SY72(outdoor fan) normal?
DC12V Is voltage
at SS71(indoor fan)
Replace
RY71,
RY73,
RY72 and
SS71
NO
NO
NO
Is voltage output termina
of D101~D105(IN4007) normal?
Replace
ICO2
Check PCB pattern .
Replace main PCB.
Replace IN4007
Replace
micom
Is voltage at #25 terminal of the
micom normal?
Are voltage at #30 and #31 of
the micom normal?
NO
NO
NO
YES NO
NO
NO
YES
OK
Is operation normal?
Replace resonator (X501)