ACP AXP5201 Service Manual

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ACP AXP5201 Service Manual Manual pdf 31 page image

29! WARNINGTo avoid risk of electrical shock, personal injury or death; disconnect power to oven and discharge capacitorbefore servicing, unless testing requires power.Illustration Component Test ResultsThermal cutout Disconnect all wires from TCO.Measure resistance across terminals.Control TCO .............................................Magnetron TCO .......................................Closed at 235°F (113°C) and open at150°F (66°C)Open at 300°F (149°C) and closed at257°F (125°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 Disconnect 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 15 Ω, then reversemeter leads 30 ΩInfiniteInfiniteTriac 1 (top) is for front elementTriac 2 (middle) is for rear elementMeasure voltage from:MT1 to Gate0.8 VAC when energized. If novoltage, check H.V. board and wiring.Capacitor Discharge CapacitorRemove wires from capacitor terminals andconnect 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. Also checkbetween 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.Cooling blowermotorMeasure voltage at motor Approximately 24 vdc at incoming leadsStirrer motor Remove all wires from terminals.Measure resistance from:Terminal to terminal..................................... Approximately 29K ΩLine filter Remove all wires from terminals.Measure resistance from:Red to Brown wire..................................... ΩInfiniteBlue to Blue wire ..................................... Infinite ΩCavity TCO ............................................. Open at 262°F (128°C)Thermal cutoutComponent Testing Procedures