Detailed Procedure - Samsung AQ12?5(6)MB Service Manual

Troubleshooting

5-3-3 Detailed Procedure

No. Malfunction
Pull out the power plug from
1 the AC terminal and confirm
the fuse on the PCB assembly
2 Turn the power on.
3 Set the TURBO mode
5-8
Checking point (symptoms)
1. Is the broken(open)?
Voltage check
1. AC voltage at BD71(~,~)?
: rating voltage ± 10% range
2. DC voltage at BD71(+,-)?
: about 325[v] ± 10%
3. DC voltage at IC02
: IN-GND DC12[v]
: OUT-GND DC5[v]
4. Voltage waveform at Q201
: collector-GND squarewave
Voltage check
1. check voltage of IC06
(pin#10,pin#8)
: relay on 0.7[v]
: relay off 12[v]
2. Voltage at terminal block
((N1) -1) rating voltage
Causes
Voltage over
Indoor unit fan
motor short-circuit
SMPS circuit is faulty
SMPS circuit is faulty
PC02, R202-R205
SMPS circuit is faulty
IC06 is faulty
RY71 is faulty
Samsung Electronics