Samsung AS-2408BR, Service Manual, Page: 32 / 55

Samsung Electronics
5-8
5-3-3 Detailed Procedure
No.
1
2
3
4
Malfunction
Pull out the power plug from
the AC terminal and check
the fuse on the PCB assembly
Turn the power on.
If lamp blinks trouble is not
related to the items 1 through
4 on the right.
Set operating mode when
RMC switch pushed.
1. COOL mode
2. Fan speed [AUTO]
3. Set temperature lower
than room temperature
4. Continuous operation.
Set operating mode when
RMC switch pushed.
1. [FAN] mode
2. Fan speed [HI]
3. Continuous operation
Checking point (symptoms)
1. Is the fuse blown?
Voltage check
1. AC voltage at both end of transformer Primary?
198 - 264V~
2. AC voltage at both end of transformer
secondary?
15 - 25V~
3. DC voltage at OUT and GND of IC01
(KA7812)? 12VDC
4. DC voltage at OUT and GND of IC02? 5VDC
5. DC voltage at Q201 Base and GND change?
squarewave
1. Compressor does not operate.
1. Voltage at
3 5
both ends of CN73 :
above 190V~
2. Indoor unit fan motor does not operate.
Causes
1. Voltage over
2. Indoor unit fan motor short-circuit.
1. Irregular power code or power fuse,
or poor wiring.
2. Transformer is faulty.
3. Power circuit is faulty.
4. Power circuit is faulty.
5. Q201 is faulty.
D101~D105 (D4G*4) is faulty.
1. Temperature of Heat exchange
is lower.
2. PCB is faulty.
1. Indoor unit fan motor is faulty.
2. Poor connection of indoor fan motor
and connector of RPM sensing (CN43)
Troubleshooting