Electrical Components & Testing, Door Lock Test | Whirlpool MAH3000

SECTION 4. ELECTRICAL COMPONENTS & TESTING

SECTION 4. ELECTRICAL COMPONENTS & TESTING

ELECTRICAL TESTS

Warning - Always shut off electrical power to the washer before beginning any service repair procedures.

Grounded Components

When performing service diagnostics, replacements and repairs, always check to determine whether all ground wires linking panel and components are reattached if removed.

Water Valve Test

The water valve test is similar to the test outlined in the 16008373 manual, except, to check the ohm resistance of thermistor, pull the P3 wire harness connector off the machine control and locate the P3(6) and P3(7) leads in the connector on the machine control board. Note the thermistor has been relocated on the valve to the outlet of the valve. (See

Figure 4-1)

Fabric Softner

Bleach

Cold

Hot

Thermistor

4 Coil Water Valve

Figure 4-1

Door Lock Test

The door lock can be verified by the following procedure.

LED Model

1.Place the washer into Service Mode. (See Section 2; Accessing Service Mode)

2.Advance to the Board Output Test and press Max Extract to Lock the door and Extra Rinse to Unlock the door.

LCD Model

1.Place the washer into Service Mode. (See Section 2; Accessing Service Mode)

2.Select Service Tests, then Quick Spin Tests to actuate the door lock mechanism. Hit Cancel to unlock the door.

Note: The relay on the control board for the door lock mechanism is disabled if the motor control board indicates the spinner speed is > 7 RPM.

For more information related to door lock mechanism, please refer to Section 2: Miscellaneous; Door Lock Philosophy.

The thermistor is on NTC and will drop in resistance when the temperature increases.

16010486 (16008373-05)Section 4. Electrical Components & Testing4-1

Revised 02/01	©2001 Maytag Appliances Sales Company

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Whirlpool MAH3000 Electrical Components & Testing, Electrical Tests, Grounded Components, Water Valve Test, Door Lock Test

Contents

Customer Service Service ManualWasher 16010061 USE ONLY GENUINE MAYTAG APPROVED FACTORY REPLACEMENT COMPONENTS SAFETY PRECAUTIONS MAH3000 INTRODUCTIONModels covered in this manual Maytag Appliances Sales Company 240 Edwards Street, S.E Cleveland, TN GENERAL C O N T E N T S ASSEMBLY SECTIONCABINET ASSEMBLY DIAGNOSTIC Displacement MOTOROUTER MACHINE Checkpoints for proper installation PRE-INSTALLATION REQUIREMENTSUNCRATING INSTRUCTIONS NOTE Proper installation is the responsibil- ity of the purchaser INSTALLATION CAUTION Do not cut or remove the ground- ing prong from this plug GROUNDING POLARITY CHECKS USE OF ADAPTERS IS NOT RECOMMENDED SPECIFICATIONS Prior To Series WASHER CONTROLS Series 17 & Later INPUT DEFINITIONSDOOR LOCK SWITCH INPUT END-OF-CYCLE SIGNAL INPUT Definitions TIMER INPUTSSTART/STOP INPUT See Push-To-Start/Line Relay Operation END-OF-CYCLE SIGNAL OUTPUT OUTPUT DEFINITIONSSee Timer Input Charts TIMER MOTOR OUTPUT TORQUE OUTPUT Vcc REFERENCE VOLTAGE OUTPUTWATER VALVE OUTPUTS 1-10 CYCLE SEQUENCE DEFINITIONSTimer Motor Output and Section 2 Timer Input Chart BLEACH DISPENSE Door Lock/Spin Control MISCELLANEOUS Door Latch Switch MonitoringRedistribution 1-11 1-12 Push-To-Start Relay OperationSTARTING THE WASHER STOPPING THE WASHER Main Wash Time/Total Cycle Time - Minutes See Notes CYCLE REVIEW1-13 Diagnosis - Clothes Wet at End of Spin 1-14 GENERAL COMPONENT EXPLODED VIEW ELECTRICAL TEST EQUIPMENT SECTION 2. ELECTRICAL COMPONENTS & TESTINGDescription Part Number G r o u n d e d C o m p o n e n t s ELECTRICAL TESTSVoltage Checks Water Valve Test Timer Input Charts Timer & Console SwitchesSECTION 2. ELECTRICAL COMPONENTS & TESTING T C B Not Asserted Key 0 = Input Signal1= Input t i m e r Machine Control M A C HIN E DRIVE MOTOR MOTOR CONTROL BOARDMotor Harness Connector Motor & Motor Control Test Motor Phase Test 1 . Disconnect power to the washer prior to testing Motor Windings Check1 . Disconnect power to the unit w i n d i n g s c h e c k S e e M o t o r W i n d i n g s C h e c k PHASE Tachometer Circuit DiagnosticsWIRE COLORS RESULT/SOLUTION Wire Checks UNBALANCE CONTROL SYSTEMTachometer Voltage Found Strut Displacement Switch Tub Displacement SwitchTesting the Tub Displacement Switch 1 . Disconnect power to the unit Testing the Strut Displacement Switch Cabinet Vibration Absorber Inertial Unbalance SwitchCabinet Vibration Sensor Testing the Inertial Unbalance Switch 2 - 1 Shuts OFF When Push-To-Start Button Re- leased SECTION 3. TROUBLESHOOTINGStart Line Relay Operation Runs For Five Seconds Then Shuts OFF ContinuesTo Tumble After The Wash Cycle Is Finished Tumbles OnlyThird Rinse Cycle Is Always Cold Temperature Inputs “Thumping” Noise In Spin Door LeaksTicking or Knocking Noise In Spin RF Radio Frequency Interference T R O U B L E S H O O T I N G SECTION 3. TROUBLESHOOTING 3 SECTION 3. TROUBLESHOOTING T R O U B L E S H O O T I N G1998 Maytag Corporation 1 6 0 0 8 3 7 3 SECTION 3. TROUBLESHOOTING 3 T R O U B L E S H O O T I N G1998 Maytag Corporation 1 6 0 0 8 3 7 3 - 0 SECTION 3. TROUBLESHOOTING T R O U B L E S H O O T I N G1998 Maytag Corporation 1 6 0 0 8 3 7 3 - 0 SECTION 3. TROUBLESHOOTING 3 3 - 1 SECTION 3. TROUBLESHOOTING 3 - 1 SECTION 3. TROUBLESHOOTING SECTION 3. TROUBLESHOOTING 3 - 1 indicators of the Quick Wash and Regular wash Energy Usage MISCELLANEOUS INFORMATIONWasher Wattages SECTION 4. CONSOLE Disconnect power to the unitR E M O V A L VERTICAL SWITCHES Push Button HORIZONTAL SWITCHES Push-to-StartR E P L A C E M E N T TIMER REMOVAL 1998 Maytag Corporation DOOR ASSEMBLY & HINGES SECTION 5. CABINET ASSEMBLYDISASSEMBLY R E M O V A L Door Latch Hoop Cabinet Vibration AbsorberFRONT PANEL Disconnect power to the unit TOP COVER DOOR LOCK MECHANISM1. Remove the front panel See Front Panel Removal REMOVAL FRONT SHROUD ASSEMBLYTroubleshooting See Front Panel & Top Cover Hinge Removal CABINET ASSEMBLY w/REAR ACCESS PANEL SECTION 5. CABINET ASSEMBLY WATER VALVE SECTION 6. WATER-CARRYING COMPONENTSREAR REMOVAL FRONT REMOVAL AIR DOME HOSE WATER LEVEL PRESSURE SWITCHREMOVAL FROM CONSOLE REMOVAL FROM OUTER TUB DISPENSER ASSEMBLY REPLACEMENT/ROUTINGNOTE Using soap and water may lead to a potential leak FRONT WATER FLUME INJECTOR PUMP ASSEMBLY5. Disconnect the hoses attached to the dis- penser assembly procedure is not followed properly CLEANING THE PUMP Pump Accessory Kit1. Depress the locking tab on the face of the pump housing 7. Installation is complete 5. Reverse the previous steps for replacement DRAIN HOSE 1998 Maytag Corporation BAFFLES DOOR BOOTSECTION 7. OUTER TUB & SPINNER ASSEMBLY Front Shroud Removal REPLACEMENT OUTER TUB COVER2. Stretch the rear lip of the door boot onto the tub cover Shroud SPIN BASKET ASSEMBLY w/BALANCE RING Figure7-6 DRIVE PULLEY1. Slide pulley on shaft Profile Washer Spinner Support Washer Locking Nut 3. Remove the drive pulley See Pulley Removal SPINNER TUB SUPPORT7. Remove the shaft seal Figure 1. Reverse the previous steps Figure7-9 SEAL SYSTEM COUNTER WEIGHTS OUTER TUB ASSEMBLYBEARINGS REMOVAL OF UPPER WEIGHT 1. Disconnect power to the unit Strut Displacement Switch STRUT ASSEMBLYINERTIAL UNBALANCE SWITCH 3. Remove the wires to the switch TUB DISPLACEMENT SWITCH SECTION 7. OUTER TUB & SPINNER ASSEMBLY DRIVE BELT SECTION 8. MOTOR DRIVE SYSTEMDRIVE MOTOR R E M O V A L Console Removal MACHINE CONTROL R e m o v a l MOTOR CONTROL SECTION 8 . MOTOR DRIVE SYSYTEM Prior to Series SECTION 9. ELECTRICAL SCHEMATICS & TIMER I N F O R M A T I O NELECTRICAL SCHEMATICS SECTION TIMER CHART - Prior to Series ELECTRICAL SCHEMATIC - Series TIMER CHART - Series ELECTRICAL SCHEMATICS ELECTRICAL SCHEMATIC - SeriesSECTION 1998 Maytag Corporation ELECTRICAL SCHEMATICS TIMER CHART - SeriesSECTION 1998 Maytag Corporation ELECTRICAL SCHEMATICS N O T E S SPECIFICATIONS CONTENTSDISPENSER ASSEMBLY WIRING INFORMATION SECTION 1. MAH4000/MAH5500A CONTROL FACIA SECTION 2. SPECIFICATIONS SECTION 4. WASHER CONTROLS OVERVIEW SECTION 3. BASIC MACHINE OPERATIONSeries 10 MAH4000 only Series 11 & Later SECTION 5. CYCLE REVIEW All Wash Time/Total Wash Cycle Cycle TimesNon-Max Cotton/Sturdy General overview of Stain Cycle Stain CycleThe following is an example of a Stain Cycle Suds detection during stain cycle Component Identification & Location SECTION 6. GENERAL COMPONENT - EXPLODED VIEW SECTION 7. ELECTRICAL INFORMATION vice repair procedures electrical power to the unit1. Discontinue power and water to the SECTION 8. WATER CARRYING COMPONENTS 1. Disconnect power and water to the machine OPERATIONSee Figure NOTE Indicator mark on hose for reinstallation Removal 1. Disconnect power and water to the washer 3. Locate the rear mounting clip on the detergent hose in the access panel opening and slide the clip off the cabinet flange. See Figure See Figure 8-11Page SECTION 9. WIRING INFORMATION SERIES 10 - SCHEMATIC MAH4000 only SERIES 11 MAH4000 and MAH5500 SERIES 10 - TIMER CHART MAH4000 SERIES 11 - TIMER CHART MAH4000 & MAH5500A New Century Neptune Washer Service Manual Supplement 16008373-05MAYTAG SECTION 4. ELECTRICAL COMPONENTS & TESTING DIAGNOSTIC/HELP CODE TABELSTEARDOWN & WIRING INFORMATION Models covered in this manual supplement MAH5500B MAH7500A 16010486 SECTION 1. GENERAL INFORMATION SPECIFICATIONSMAH5500B CONTROL FACIA MAH7500 CONTROL FACIA BASIC MACHINE OPERATION General Flow Of A Complete Wash Cycle Wash Time Tumble CYCLE SEQUENCESWash Selections Tumbling Time Extra Heavy, Quick INPUT WATER TEMPERATURESelected Rinse Features of MAH7500 LCD Washer Features of MAH5500B LED WasherSECTION 2. WASHER CONTROLS OVERVIEW BASIC CONTROL BOARD PHILOSOPHY FOR BOTH WASHERS USER INTERFACE SIGNAL MODESELECTIONS LED Washer FABRIC MODE OPTIONS MODE DISPLAY CHARACTERISTICSPage 1-3 Extra Rinse Table Door Locked LED DOOR LOCK SWITCH INPUT PRESSURE SWITCH INPUTINPUT MODIFICATIONS DEFINED TEMPERATURE SENSOR INPUT OUTPUT MODIFICATIONS DEFINED DiagnosticsSTART/PAUSE INPUT TACH INPUT CYCLE SEQUENCE DEFINITIONS Main Wash Target TemperaturesWATER VALVE OUTPUTS BLEACH DISPENSE REDISTRIBUTIONSUDS DETECTION MISCELLANEOUS DOOR LOCK PHILOSOPHYDOOR LOCK OPERATION SPECIAL FEATURES POWER LOSS/FAILUREMAH7500A ADVERTISING MODE LED Washer SERVICE MODELCD Washer 2-10 SERVICE MODE TABLE LED Washer Accessing Service ModeLED WASHER SPECIAL TESTS 2-12 QUICK SERVICE CYCLESpeed Range Displayed BOARD INPUT TEST Accessing The Help CodesHELP CODES BOARD OUTPUT TEST Section 5 DIAGNOSTIC/HELP CODE TABLES DIAGNOSTIC CODESAccessing Diagnostic Codes Clearing Diagnostic Code List Service Tests ACCESSING SERVICE MODELCD WASHER User Interface Tests Service Cycle During a cycle2-16 2-17 Note This selection is valid only if a cycle is running exit diagnostic/help codes Return to DIAGNOSTIC/HELP CODESClear diagnostic codes Clear the entire list of diagnostic codes SYSTEM CHECK HELP CODES LISTING Section 3 DIAGNOSTIC/HELP CODE TABLESHelp Trigger Description HelpTrigger Action to be Taken Description Diag DIAGNOSTIC CODES LISTINGDescription Trigger Diag Description Component Identification & Location GENERAL COMPONENT - EXPLODED VIEW Glossary of Terms Spin Speed - This is the speed of the washer spinner during extraction 3-10 ELECTRICAL TESTS SECTION 4. ELECTRICAL COMPONENTS & TESTINGGrounded Components Water Valve Test Board Output Test Machine Control INPUT/OUTPUT VOLTAGES LED Washer INPUT/OUTPUT VOLTAGES LCD Washer On the MAH5500B washer you can perform the Membrane Pad Check with the control console. See Section 2 Accessing Service Mode Membrane Pad Check Membrane Pad Checks DRIVE MOTOR Motor Control AccessMOTOR CONTROL BOARD Drip Shield Removal Motor Drive System Test Motor PhasesMachine Control Board Output Test Motor & Motor Control Test Heater Will Not Turn On HEATER ASSEMBLY Heating Targets Using Thermistor Temperature ChartUser Selections Main Wash Tempering CONSOLE REMOVAL SECTION 5. TEARDOWN & WIRING INFORMATIONMICROPROCESSOR BOARD REMOVAL LCD MODEL CABINET ASSEMBLY CONSOLE COVER PLUGDOOR LATCH HOOP DOOR LOCK MECHANISM Removal 1. Discontinue power and water to the machine REAR ACCESS PANELPRESSURE SWITCH WATER SYSTEM COMPONENTS HEATER ASSEMBLY PUMP ASSEMBLYREINSTALLATION REMOVAL SUMP COVER Thermistor Removal MAH5500B WIRING INFORMATION MAH7500 Maytag Appliances Sales Company Customer Service 240 Edwards Street, S.E Cleveland, Tennessee