TROUBLESHOOTING
4-2-8. If compressor does not operate
Refer to test function
in the manual
☞ Voltage checking method
Common Ground REG1 Heater Sink in PCB
and 1) IC01 MICOM #4 ; Square wave
voltage → 3V measured after MULTI TEST
IC01 MICOM #4, COMP operates
Common PCB Ground
REG1 Heater Sink
Start
Check after 7 minutes
Repair OPEN & disconnection
Repair OPEN &
disconnection
Did 7 minutes pass
after Compressor OFF?
No
Yes
No
Check bad contact of connector
Check bad contact of connector
No
Replace PCB
0~800Hz 50% Duty
Signal output
No
Check the wire
disconnection
No
Repair the sensor &
replace PCB
No
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Does compressor work
with manual operation?
Is CN75 PIN #4
High?(2.5V)
Is the wiring between
Main and Sub normal?
Is the connector between
Main and Sub normal?
No
Is the connector(CN03)
of COMP normal?
Replace the INVERTER
PCB ASS’Y
No
Is the DIODE voltage
between Pins for a single SPM
part normal?
Is freezer sensor normal?
Is the temperature sensor of
MAIN PCB normal?
Normal
Refer to the DIODE voltage value in
the SPM
Replace the resistance &
INVERTER PCB ASS’Y
No
Is the resistance value
at the measured position
normal?
Replace COMP ASS'Y
No
Is COMP ASS'Y
normal?
300K-F(CHIP) : INVERTER PCB
R509,510,511,512,513,514,515
Did buzzer of manual operation sound?
(Check certainly after manual operation)
82
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