Samsung RB195BSSB Service Manual - Page 63

Diagnostics 13-5) When Defrost does not operate Pre-Check 1. With a shorted-out F or R Defrost Sensor,the fridge operates normally excepting Defrost (The fault can be picked up with self-diagnosis,POWER ON/OFF). 2. There will be Heating trouble with a shorted-out Temp FUSE,which contributes to Defrost by natural Temp increase resulting in a Temp Control problem stemmed from the increased COMP OFF time. 3. When a F or R Defrost Sensor is faulty as OPEN,Heating will not be terminated,and COMP will remain off following the Temp FUSE short-off.(The fault can be picked up with self-diagnosis, POWER ON/OFF) Start PANEL PCB KEY Press Super Cool and Fridge at the same time for 5 sec. Press any button 3 times when the entire display blinks. -.Once:Forced Operation -.Twice:R Defrost -.3 times:F/R Defrost -.4 times:Cancel A Dose Defrost start operating when F or R Forced Defrost button pushed? YES Is power supplied to Defrost Heater? YES R Defrost Heater #21 F Defrost Heater #15 R Defrost Heater IC70 #11 F Defrost Heater IC52 #17 COMMON RELAY K72 R Defrost Heater K71 F Defrost Heater K70 - Reference • Load terminal Measure method. Are MICOM #21  "HIGH"(5V)? YES Are IC70 #11 &IC52 #17 "LOW"(0.7V)? YES Is Defrost Heater Relay (K71,K70) normal? YES Is contact of Connector N70 normal? YES Is Temp FUSE on EVAP. normal? YES Is Defrost Heater shorted out? YES Check wire assembled status/Chang MAIN PCB ASS'Y 63 NO NO Is concerned Defrost Sensor Temp higher than 12 ℃? YES Maintain Forced Operation for a certain time NO Change PCB NO Check IC70 &IC52 / Change PCB NO Check RELAY /Change PCB NO Check contact of Connector CN70 again NO Change Temp FUSE NO Change EVAP.ASS'Y