Samsung AP500PF Service Manual page 17

4-3-3 When the compressor does not operate
1) Checkpoints
(1) Is the voltage of the power source normal?(AC 187V - AC 253V)
(2) Is the desired temperature set at a higher level than the current temperature at the time of
"Cool" operation?
(3) Is the power-in good contact with the comp. connector(GT 1, 2, 3)?
(4) Check the wirings of the outdoor and indoor unit for a wrong connection or poor contact.
(5) Isn't the compressor in a 3-minute stand-by state?
2) Checking procedures(after checking the checkpoints of clause 1)
Turn off the power, and then turn it on in 5 seconds.
Check whether the relay(RY1) is turned on and the compressor is
operated in 3 minutes after starting the "COOL" operation by activat-
ing the on/off button and operation made key.
Is the resistance at both ends of the relay(RY 1) coil approximately 400Ω?
Is it "high" when checking the output wave of the MICOM
(IC1) pin No. 6?
Is the voltage at both ends of the relay(RY1) coil DC 12V?
Is the voltage at both ends of the electronic contactor coil
AC 187V ~ AC 253V?
Is the voltage at both ends of the electronic contactor terminal
AC 187V ~ AC 253V?
Replace the compressor.
16
N
Y
Y
Y
Y
Y
Y
Then the compressor and relay are normal.
N
Replace the relay when the
resistance is 0Ω or ∞.
N
Then check and replace the
MICOM (IC1).
Is it "low" when checking
N
the output wave of the IC 3
No. 16.
Y
N
Then check the wiring of indoor unit and Then
check the wiring of outdoor unit short or open.
N
Then check and replace the
electronic contactor
Check and measure
the resistance value
after turning off the
power.
N
Then check and
replace the IC 3