Samsung RT38 Service Manual page 53

TROUBLESHOOTING
4-2-5. When the Compressor is not working (INVERTER PBA)
When the inverter PBA LED
is ON, it indicates that the
compressor does operate
normally
Refer to Test Function in this
manual
Forced Operation signal
sound should be checked
0~800Hz 50% Duty Signal
Output
Check the wire harness
Replace the MAIN PBA
Replace INVERTER PBA
☞ SMPS Primary Voltage checking(+16V) : REG1(+5V)
Terminal(Input and GND) : DC16V±1.6V
Terminal(Output and GND) : DC5V±0.2V
Start
10 minutes have
passed since COMP
was off
Yes
When Forced Operation
mode is activated, COMP operates
Yes
Yes
COMP operation
No
Signal(CN201 ②↔③) is
High(about DC 2-2.5V
or AC 0~5.0V)
Yes
No
Is DC 16V applied to
ZD501?
Yes
CN101/CN102 Connector is Good
Yes
COMP ASS'Y is Good
Yes
NORMAL(Recheck)
No
No
Temperature Sensor is normal?
Temperature sensing
part of MAIN PBA is Good
Replace MAIN PBA or
Repair the connection
No
Check the COMP wire
Check the Compressor
Check AC Power wire
No
Replace COMP ASS'Y
58
Check in 10 minutes
No
Yes
Replace the Sensor
No
Repair the sensing
Yes
part or Replace MAIN PBA