Samsung RB1855SW - Appendix I: Circuit Diagnostics Reference; Cabinet Door Wire Connector Pinouts; Relay Failure Diagnosis

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Appendix
ⅠⅠ
(Reference for circuit diagnostics)
Note) C → Common, NO → Normal open, NC → Normal close
3. When it operates as above, it is normal and
when it does not operate, repair the
corresponding relay.
1. Measure the coil bisection of the relay and
check whether it works.
2. Measure the apex bisection for open circuit.
* Disconnect the wire connector from the main
PCB CN70, 71 and measure the following
items.
Ref.1) Wire connector on the cabinet door.
Ref. 2) How to check relay failure
Category of contacts
3 contacts
2 contacts
Voltage between both of
the contacts
C:NO → SHORT
C:NC → OPEN
C:NO → OPEN
C:NC → SHORT
SHORT
OPEN
Voltage between both
of the coil terminals
DC 12V
(OPERATION)
DC 0V
(NO OPERATION)
DC 12V (OPERATION)
DC 0V(NO OPERATION)