ACP P1333401M Service Manual

Contents

ACP P1333401M Service Manual Manual pdf 2 page image

Component Testing Procedures! WARNINGTo avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitorbefore servicing, unless testing requires power.16500030 January 2012©2012 ACP, Inc.2Illustration Component Test ResultsThermal cutout Disconnect all wires from TCO.Measure resistance across terminals.Magnetron TCO ....................................Cavity TCO ............................................Open at 300°F (149°C) andclosed at 257°F (125°C)Opens at 262°F (128°C)Diode Discharge CapacitorRemove diode lead from capacitor andconnect ohmmeter.Reverse leads for second test.Infinite resistance should be measuredin one direction and 50KΩ or more inthe opposite direction.NOTE: Ohmmeter must contain abattery of 6 volts minimum.MT2MT1 GA TETriac Resistance CheckDisconnect wires to triac.Measure resistance from:MT1 to MT2 ...........................................MT1 to Gate ..........................................MT2 to Gate ..........................................All terminals to ground ..........................Caution - Do not operate oven withwire to terminal MT2 removed.InfiniteApproximately 60 ΩInfiniteInfiniteTriac 1 (center)Triac 2 (left)Triac 3 (rightVoltage CheckMeasure voltage from:MT1 to Gate0.8 VAC when energized. If novoltage, check H.V. board and wiring.CapacitorSome units may usemore then one type ofcapacitor. Refer toParts Manual forcorrect capacitorquantity.Discharge CapacitorRemove wires from capacitor terminalsand connect ohmmeter, set on highestresistance scale to terminals.Also check between each terminal andcapacitor case.Between Terminals: Meter shouldmomentarily deflect towards zero thenreturn to over 5 MΩ. If no deflectionoccurs, or if continuous deflectionoccurs, replace capacitor.Terminal to Case: Infinite resistanceSnubber assembly Disconnect wires to snubber.Measure resistance across terminals ........ InfiniteMagnetron Discharge CapacitorRemove wires from magnetron andconnect ohmmeter to terminals. Alsocheck between each terminal and ground.Between Terminals: Less than 1 ΩEach terminal to ground measuresInfinite resistance.Note: This test is not conclusive. Ifoven does not heat and all othercomponents test good replace themagnetron and retest.Blower motor Remove all wires from motor.Measure resistance across coil ................. Approximately 25 Ω