Electrical Malfunction; Terminal Block - Samsung FCQ321HTUW Service Manual

4. Troubleshooting

4-2 Electrical Malfunction

Safety error
No power
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
or
(Black) (Black)
Yes
Yes
Yes
No
ZNR1 ZNR1
(Varistor) (Varistor)
Connector Connector
CN01(AC 120V) CN01(AC 120V)
L1
L2 L2
L1
(Red) (Red)
L2
N N
(White) (White)
No * Reset the circuit breaker
or check main power.
END
No
* replace Thermostat.
Thermostat Thermostat
(150/0) (150/0)
**Reconnect and replace or
repair harness is damaged
Check whether varistor(ZNR1) on
main PCB has been damaged.
Yes
* replace Main PCB.
38
L2 : 240V
N : 120V
N : 120V
END