Samsung AW0801B, Service Manual

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Samsung Electronics 5-7
Troubleshooting
5-2-5 When the fan motor does not operated
1) Check points
(1) Is the voltage of the power source normal ? (the rating voltage ±10% range. )
(2) Is the electric wire in good contact ?(CN71, RY71)
(3) Is the starting condenser(FAN MOTOR) in good contact?
(4) Is the fan motor connector in good contact?(CN73)
(5) Is the output voltage of the IC01(KA7812) and IC02(KA7805) normal ?
Turn off the power, and then turn it on again five
seconds later.
Replace the fan motor.
Dose the buzzer sound, when the power on?
Check whether the "COOLING ICON" LED lamp is on
and the operation starts when pressing the
on/off button of the remocon.
Is the IC03 output normal?
- When the fan motor is High, IC03 No. 12 pin
→
Low.
- When the fan motor is Med, IC03 NO. 14 pin
→
LOW.
- When the fan motor is Low, IC03 No. 15 pin
→
Low.
Does the relay(RY 72, 73,74) operate normally?
- When the fan motor is High, RY74 should operate.
- When the fan motor is Med, RY73 should operate.
- When the fan motor is Low, RY72 should operate.
Go to the clause "No power".
• Go to the clause of "when the
remocon does not operated".
• Check the IC03 for a short and cold
soldering.
• Replace the IC03.
• Check the relay coil resistance.
(Normal: About 400
Ω
)
• Replace the relay.
N
Y
Y
Y
Is the fan motor normal?
Y
Y
N
N
N
• Check the fan motor resistance.
(0
Ω
: short,
∞Ω
: open)
• Check the fan motor thermal fuse?
N
DB98_04511A(2)-2 2/18/03 4:12 PM Page 5-7