Samsung RS2777, RS2544, RS2666 Appendix ⅠReference for circuit diagnostics, DC 0V Stop Condition

Appendix Ⅰ(Reference for circuit diagnostics)

Ref.1) Wire connector on the cabinet door.

Ref. 2) How to check relay failure

Disconnect the connector of the main PCB

CN70 and CN71, then check the follows :

1. Measure the voltage at both terminals of a coil and

determine if the relay is working.

2. Measure the voltage at both terminals of a trigger and

determine if SSR is working.

3. Measure the resistance at both terminals of a load

contact, and determine if there is an error in voltages of coil and trigger.

Note) NC -> Normally Close (C terminal and ON terminal) NO -> Normally Open (C terminal and Open terminal)

C -> Common Terminal

Div. of contact	Voltage at both terminal of coil and trigger	Both terminals of contact	Resistance value
3-contact	DC 12V (Working Condition)	Between C and NO	0Ω (Short) -> Normal
		Between C and NC	∞Ω (Open) -> Normal
terminal
	DC 0V (Stop Condition)	Between C and NO	∞Ω (Open) -> Normal
Relay
		Between C and NC	0Ω (Short) -> Normal
2-contact	∼ DC 12V (load working condition)	Betweenbothterminalsofcontact	0Ω (Short) -> Normal
terminal
	∼DC 0V (load stop condition)	Betweenbothterminalsofcontact	∞Ω (Open) -> Normal
Relay
SSR	∼DC 12V (load working condition)	Betweenbothterminalsofcontact	About 4-5㏀(Short) -> Normal
	∼DC 0V (load stop condition)	Betweenbothterminalsofcontact	∞Ω (Open) -> Normal

59