Appendix Ⅰ Ⅰ (Reference For Circuit Diagnostics) - Samsung RB1855SW Service Manual

Appendix Ⅰ Ⅰ (Reference for circuit diagnostics)
Ref.1) Wire connector on the cabinet door.
Ref. 2) How to check relay failure
* Disconnect the wire connector from the main
PCB CN70, 71 and measure the following
items.
1. Measure the coil bisection of the relay and
check whether it works.
2. Measure the apex bisection for open circuit.
Voltage between both
Category of contacts
of the coil terminals
(OPERATION)
3 contacts
(NO OPERATION)
DC 12V (OPERATION)
2 contacts
DC 0V(NO OPERATION)
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.
57
Voltage between both of
the contacts
C:NO → SHORT
DC 12V
C:NC → OPEN
C:NO → OPEN
DC 0V
C:NC → SHORT
SHORT
OPEN