Electrical Malfunction - Samsung FTQ387LWGX Service Manual

4. Troubleshooting

4-2 Electrical Malfunction

Safety error
No power
or
No display
*Check terminal block voltage.
AC 240V/120V or AC208V/120V
*Thermostat open check. (150°c / 0°c )
*Check the pin voltage of connector
(CN01) on Main PCB.
(Input voltage : 120V)
Check the Low voltage Transformer
Low Voltage Transformer Low Voltage Transformer
IC03(7805) IC03(7805)
IC02(7812) IC02(7812)
(Terminal Block) (Terminal Block)
L1 L1
(Black) (Black)
No
Yes
No
Yes
Yes
No
**Reconnect and replace or
repair harness is damaged
Check whether varistor(ZNR1) on
main PCB has been damaged.
ZNR1 ZNR1
(Varistor) (Varistor)
Connector Connector
CN01(AC 120V) CN01(AC 120V)
42
L1 L2 : 240V
L2 L2
L1 N : 120V
(Red) (Red)
L2 N : 120V
N N
(White) (White)
* Reset the circuit breaker
or check main power.
END
* replace Thermostat.
Thermostat Thermostat
(150/0) (150/0)
Yes
* replace Main PCB.
END