ADC 450428 service manual Main Door Condition, Microprocessor Computer

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c.If no voltage is present at J7 9-pin connector no. 4 to ground, but voltage is present at no. 3 to ground. The problem is a faulty switch, wires or termination between J7 to J8 and J8 to the lint switch no. 20 and 21.

d.If no voltage is present at J7 9-pin connector no. 3 to ground, then voltage should not be present at no. 5 to ground. Replace the board.

6.Main Door Condition

NOTE: Make sure main door and lint door are closed. Also, if checking either switch, the plunger must be depressed.

a.Check L.E.D. (light emitting diode) input light “MAIN” on the component side of the computer. If the light is on, replace the computer.

b.Check voltage (24 VAC) from J7 9-pin connector no. 5 to ground. If voltage is present, check no. 6 to ground. If voltage is present, replace board.

c.If no voltage is present at J7 9-pin connector no. 6 to ground, but voltage is present at no. 5 to ground. The problem is a faulty switch, faulty wires or terminations J7 to J8. J8 to J5 and J5 to main door switch no. 31 and no. 32.

7.“No Heat” drive and blower motors run, display reads normal (gas models).

a.Check L.E.D. (light emitting diode) input light “HT1” on the component side of the computer. If the light is on replace the board.

b.If the L.E.D. (light emitting diode) input light “HT1” on the component side of the computer is on and there is no voltage to the HSI (Hot Surface Ignition) module “w” the display will read “BURNER CONTROL FAIL.” The problem is faulty wires or terminations between microprocessor and HSI (Hot Surface Ignition) module.

c.If voltage is present on the HSI (Hot Surface Ignition) module “w” to ground. Check voltage at the gas valve if voltage is present across the two (2) “yellow” wires at the gas valve and the gas supply is on then the fault is that of the gas valve.

8.Microprocessor (Computer)

a.Replace the temperature sensor underneath the tumbler (basket) on a bracket (the bullet shaped device).

b.If it still reads “TEMP SENSOR FAIL CHECK TEMP SENSOR FUSE,” unplug J3 4-pin connector from the temperature sensor bracket. Also, unplug the microprocessor J14 4-pin connector from the computer board. Take a continuity reading from J14 no. 1 to J3 no. 1, then from J14 no. 2 to J3 no. 2.

If there is no continuity, check for break in wire, a short to the ground, loose terminations, or even replace the wire.

If there is continuity, computer board is faulty.

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Contents ML-130 American Dryer CorporationRetain This Manual In a Safe Place For Future Reference For Your Safety Page Table of Content Phase 6 OPL System Diagnostics Safety Precautions Important InformationStandards MATERIALS, GASOLINE, and Their Flammable Vapors Routine MaintenanceCleaning Adjustments LubricationElectrical and GAS Requirements Installation RequirementsENCLOSURE, AIR SUPPLY, and Exhaust Requirements Operational Service Check Procedure Page Description of Parts Control BOXDrive Motor HSI HOT Surface Ignition Module Gas Models OnlyBlower Motor and Impellor GAS Burner AssemblyIdler Assembly Tumbler Basket Main Door SwitchTumbler Basket Bearing and Pulley Arrangement HI-LIMIT Gas and Electric Models Only Sail Switch Gas and Electric Models OnlyManual Reset Thermostat Steam Damper System Lint Drawer SwitchLint Drawer Servicing IntroductionComputer Controls To Replace Computer Control PanelTo Replace Computer To Replace Keyboard Touchpad Label AssemblyTo Replace Microprocessor Temperature Sensor Probe Ignition Controls To Remove Hot Surface Ignitor refer to illustration aboveTo Remove Flame Sensor Probe HSI Ignitor Flame Sensor ProbeTo Test and Adjust Gas Water Column Pressure To Replace Main Burner OrificesTo Convert from Natural Gas to L.P. Gas Thermostats To Replace Burner TubesTo Replace HSI Hot Surface Ignition Module Page Sail Switch Assembly Gas and Electric Models Only To Replace Sail SwitchTo Adjust Sail Switch Personal Injury or Fire could ResultTo Replace Main Door Assembly To Install New Main Door GlassTo Replace Front Panel To Replace Main Door Hinge BlockTo Replace Small Idler Pulley PulleysTo Replace Tumbler Basket Pulley To Replace Large Idler Pulley To Replace Motor PulleyTumbler Basket Assembly Tumbler Basket Alignment Vertical Up and Down AdjustmentTumbler Basket Alignment Lateral Side to Side Adjustment To Replace Tumbler Basket or Tumbler Basket SupportTo Replace Front Tumbler Basket Support Pillow Block Bearing To Replace Front Idler Shaft Pillow Block Bearing To Replace Rear Idler Shaft Pillow Block BearingBelt Tension Adjustment Tumbler Basket to Idler Belt Tension Adjustment Motor to IdlerBelts To Replace V-BeltsTo Replace Impellor Motor Fan Shaft Drive MotorsTo Replace Drive Motor Impellor Lint Drawer Assembly To Replace Lint ScreenTo Replace Lint Drawer Switch Computer will not accept keyboard touchpad entries TroubleshootingNo display on computer Dryer will not start, but computer display indicators are on Dryer operates but is taking too long to dryOverload for impellor fan motor is tripping Burner hi-limit safety thermostat is trippingThermal overload for drive motor is tripping There is excessive vibration coming from the tumbler basket Phase 6 OPL System Diagnostics Diagnostic L.E.D. light emitting diode Display Failure CodesPage E.D. light emitting diode Display Indicators E.D. Display Indicator NumberE.D. Display Indicator Number HT1 Heat Output L.E.D. Indicator FAN Blower Output L.E.D. IndicatorAIR AIR JET Output L.E.D. Indicator Optional Main Main Door Input L.E.D. Indicator Fuse Main Fuse Input L.E.D. IndicatorLint Lint Door Input L.E.D. Indicator Flame bURNER Control Fail Input L.E.D. Indicator Power Supply Input L.E.D. IndicatorE.D. Codes 1. Display Codes ALL REVGAS only Ignition Attempt Failure GAS Models only Power 24 VAC is not Evident AT GAS ValveGAS/ELECTRIC only BURNER/OVEN Open HI-LIMIT Circuit Computer Logic and Wiring Diagram Page No Display Condition Drive motor reverses but does not forward, blower motor runsBlower motor does not operate, drive motor runs Lint Door ConditionMain Door Condition Microprocessor ComputerManual Reset HI-LIMIT Instructions For Phase 6 ModelsTechnical Information Motor Plate High and LOW VoltageData Label Information on the Data LabelHOW to USE a Manometer Tool List ADC450428 1- 02/22/00-25
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