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.
Category Voltage of coil
DC 12V(Operation)
3-contact
terminal Relay
DC 0V(Standstill)
2-contact
DC 12V(Operation)
DC 0V(Standstill)
terminal Relay
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.
27
Judge
terminal
C-NO:SHORT
C-NC:OPEN
C-NO:OPEN
C-NO:SHORT
SHORT
OPEN