ACP RFS12MPSB Service Manual
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Contents
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Testing Procedures! WARNINGTo avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitorbefore servicing, unless testing requires power.16400007 Rev.0 ©2010 ACP, Inc.16Illustration Component Testing ResultsThermal cutout Disconnect all wires from TCO.Measure resistance across terminals.Cavity TCO .............................................Magnetron TCO ......................................Closed at 32°F (0°C) andOpens at 230°F (110°C)Closed at 140°F (60°C) andOpens at 320°F (160°C)Diode Discharge CapacitorRemove diode lead from capacitor andconnect ohmmeter.Reverse leads for second test.Infinite resistance should bemeasured in one direction and 50KΩor more in the opposite direction.NOTE: Ohmmeter must contain abattery of 6 volts minimum.Capacitor 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 zerothen return to over 5 MΩ. If nodeflection occurs, or if continuousdeflection occurs, replace capacitor.Terminal to Case: Infinite resistanceMagnetron Discharge CapacitorRemove wires from magnetron andconnect ohmmeter to terminals. Alsocheck between each terminal andground.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 28 – 35 ΩStirrer motor Remove all wires from motor.Measure resistance across terminals ..... Approximately 12 – 14 KΩFilamentSecondaryPrimaryTransformer Discharge CapacitorRemove all wires from terminals.Measure resistance from:Primary ..................................................Filament.................................................Secondary to Ground screw ontransformer stack...................................Less than <1 ΩLess than <1 ΩApproximately 70 – 80 ΩNoise filter board Power In terminals ..................................Power Out terminals ...............................120 VAC120 VACIf no power in, check power outlet.If no power out, check fuses.Circuit Protector Measure resistance across terminals ..... Between Terminals: Less than 1 Ω |
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