Fault Diagnosis By Symptom - Samsung ASH070VE/D Service Manual

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
YES
Is DC voltage of
PCB display normal?
Is 198~264VAC
Replace
applied to the
PCB display
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?
NO
Replace power
transformer
Replace resonator (X501)
Is operation normal?
YES
OK
5-2
Remove power cord and plug in
again in approx. 5 seconds
Is operation lamp blinking?
NO
Does operation start when
run/stop button on the remote
controller unit pushed?
NO
Is transmission display of the
remote controller unit blinking?
Is "beep"sound heard from the
NO
NO
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?
DC5V
YES
Is voltage at #32 terminal of the Micom
normal? 0VDC
Is voltage at #64 terminal of the Micom
normal? 5VDC
Is voltage at #25 terminal of the
micom normal?
Are voltage at #30 and #31 of
the micom normal?
NO
NO
YES
YES
NO
NO
YES
main unit?
YES
NO
YES
YES
10ms
NO
YES NO
10ms
YES
NO
100ns
YES
Replace
micom
Normal
Refer to remote control
unit fault diagnosis
Replace PCB
module.
Are voltages at RY71
(Compressor) RY73(4-way valve)
and SY72(outdoor fan) normal?
DC12V Is voltage at SS71(indoor fan)
YES
Check connec- Replace
tions compressor RY71,
4-way valve, out- RY73,
door fan and RY72 and
indoor fan. SS71
Is output voltage of ICO2 normal?
YES
Replace
Check PCB pattern .
ICO2
Replace main PCB.
Is voltage output terminal
of D101~D105(IN4007) normal?
YES NO
Replace IN4007
OK
Samsung Electronics
NO
NO