Panasonic NR-B420M Service Manual

Panasonic NR-B420M Service Manual Manual pdf 2 page image

---- 2 ----B420M/MS/MW, B480M/MS/MW,B570M/MS/MW/D/D-*9, B53D2,B643M/MS/MW/D/D-*9, B703M/MS/MW,C603D, C703M/MS/MW/DSECTION I TROUBLE SHOOTING GUIDESymptom 1. No cooling at all.Compressor does not operate. (No compressor motor operation noise.)Does light insiderefrigerator light up?Does compressoroperate when thermostatis short circuited?Does compressoroperate whentimer is set to collingoperation side?YESNONONOYesPower breaker OFF.Power corddisconnected.Broken wire inpower cord.Reset powerbreaker.Plug in powercord.Replace powercord.Thermostat gas leak. Rèplacethermostat.Faulty thermostatcontacts.Replacethermostat.Yes Blown temperature fuseReplace bimetalthermostat andtemperature fuseDefrost heater broken Replacedefrost heater.Faulty timer contacts Replace timer(Disconnect two joints of both ends of fuseand check continuity between sky blue andbrown joint.)(Disconnect timer wires and check continuity between yellowgreen (3) and gray (4) terminals of timer. Fig. 1)Faulty overloadprotector contactsReplaceoverload relay(Short circuit wires and of the overload protector; it thecompressor operates, the overload protector is faulty. Fig. 2)Fig. 1Fig. 2ContinuitycheckOhm meter