Samsung RS2544 Service Manual

Also see for RS2544: Service guide

Samsung RS2544 Service Manual Manual pdf 75 page image

75Appendix ⅠⅠ(Reference for circuit diagnostics)Ref.1) Wire connector on the cabinet door.Ref. 2) How to check relay failureDiv. of contact Voltage at both terminal of coil and trigger Both terminals of contact Resistance value3-contactterminalRelay0Ω (Short) -> Normal∞Ω (Open) -> Normal∞Ω (Open) -> Normal0Ω (Short) -> Normal0Ω (Short) -> Normal∞Ω (Open) -> NormalAbout 4-5㏀ (Short) -> Norma l∞Ω (Open) -> NormalBetween C and NOBetween C and NCBetween C and NOBetween C and NCBetween both terminals of contactBetween both terminals of contactBetween both terminals of contactBetween both terminals of contactDC 12V (Working Condition)DC 0V (Stop Condition)∼ DC 12V (load working condition)∼DC 0V (load stop condition)∼DC 12V (load working condition)∼DC 0V (load stop condition)2-contactterminalRelaySSRDisconnect the connector of the main PCBCN70 and CN71, then check the follows :1. Measure the voltage at both terminals of a coil anddetermine if the relay is working.2. Measure the voltage at both terminals of a trigger anddetermine if SSR is working.3. Measure the resistance at both terminals of a loadcontact, and determine if there is an error in voltages ofcoil and trigger.Note) NC -> Normally Close (C terminal and ON terminal)NO -> Normally Open (C terminal and Open terminal)C -> Common Terminal