Manuals / Whirlpool / Kitchen Appliance / Dishwasher

Whirlpool MAH3000 service manual Machine Control, Board Output Test

Models: MAH3000

1 157

Download 157 pages 41.3 Kb

Page 142

Machine Control

			DOOR LOCK MECHANISM
	Emergency		Rotating
	Cord		Rotating
Door	Cord		Cam	Cam		Door Open/
			Cam

Lock/Unlock		Mechanical			Door Lock	Closed Switch
Solenoid		Mechanical		Support	Spring
		Opener

Solenoid

Push-Rod

Locking	Door Lock/		Lamp Socket
Lever	Door Lock/		Lamp Socket
	Unlock	Door Actuator	& Lamp
	Switch	Door Actuator
	Switch

Figure 4-2

Machine Control

The machine control microprocessor board is located in the control console, mounted to the plastic console. The board receives input from the membrane pad/touch screen, door lock switches, and the unbalance switches. The control also communicates with the motor control board to facilitate the various cycles and drive the motor for optimum performance. This is done by monitoring torque and speed of the motor through the motor control board.

Figure 4-3

Both incoming and exiting voltage is monitored through the machine control board and the surrounding circuitry. The following table lists the voltages for the various terminals on the microprocessor board. If proper voltage is not present, check switches and wiring for possible loose connections or open circuits by disconnecting the power supply and performing continuity checks of individual circuits. NOTE: Connector P8(2) (White wire) is Neutral input and L1 input is the connector P6(2) (Black wire), L1 output is connector P6(3) (Black wire).

The machince control board outputs can be verified by placing the washer into the Service Mode and performing a Board Output Test. (See Section 2; Service Mode;

Board Output Test.)

16010486 (16008373-05)Section 4. Electrical Components & Testing4-2

Revised 02/01	©2001 Maytag Appliances Sales Company

Image 142

Whirlpool MAH3000 service manual Machine Control, Board Output Test

Contents

Washer Service ManualCustomer Service 16010061SAFETY PRECAUTIONS USE ONLY GENUINE MAYTAG APPROVED FACTORY REPLACEMENT COMPONENTSModels covered in this manual INTRODUCTIONMAH3000 Maytag Appliances Sales Company 240 Edwards Street, S.E Cleveland, TNC O N T E N T S GENERALCABINET ASSEMBLY SECTIONASSEMBLY DIAGNOSTICOUTER MOTORDisplacement MACHINEUNCRATING INSTRUCTIONS PRE-INSTALLATION REQUIREMENTSCheckpoints for proper installation NOTE Proper installation is the responsibil- ity of the purchaserINSTALLATION GROUNDING POLARITY CHECKS CAUTION Do not cut or remove the ground- ing prong from this plugSPECIFICATIONS USE OF ADAPTERS IS NOT RECOMMENDEDWASHER CONTROLS Prior To SeriesDOOR LOCK SWITCH INPUT INPUT DEFINITIONSSeries 17 & Later END-OF-CYCLE SIGNAL INPUTWATER TEMPERATURE INPUTS TEMPERATURE SENSOR INPUTTIMER INPUTS DefinitionsSee Timer Input Charts OUTPUT DEFINITIONSEND-OF-CYCLE SIGNAL OUTPUT TIMER MOTOR OUTPUTVcc REFERENCE VOLTAGE OUTPUT TORQUE OUTPUTWATER VALVE OUTPUTS DELAY CYCLE SEQUENCE DEFINITIONS1-10 Timer Motor Output and Section 2 Timer Input ChartRedistribution MISCELLANEOUS Door Latch Switch MonitoringDoor Lock/Spin Control 1-11STARTING THE WASHER Push-To-Start Relay Operation1-12 STOPPING THE WASHER1-13 CYCLE REVIEWMain Wash Time/Total Cycle Time - Minutes See Notes Diagnosis - Clothes Wet at End of SpinSECTION 1. GENERAL INFORMATION GENERAL COMPONENT EXPLODED VIEW1-14 1998 Maytag CorporationDescription SECTION 2. ELECTRICAL COMPONENTS & TESTINGELECTRICAL TEST EQUIPMENT Part NumberVoltage Checks ELECTRICAL TESTSG r o u n d e d C o m p o n e n t s Water Valve TestSECTION 2. ELECTRICAL COMPONENTS & TESTING Timer & Console SwitchesTimer Input Charts T C B1= Input Key 0 = Input SignalNot Asserted t i m e rMachine Control M A C HIN E MOTOR CONTROL BOARD DRIVE MOTORMotor Harness Connector Motor Phase Test Motor & Motor Control Test1 . Disconnect power to the unit Motor Windings Check1 . Disconnect power to the washer prior to testing 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 kWIRE COLORS Tachometer Circuit DiagnosticsPHASE RESULT/SOLUTIONTachometer UNBALANCE CONTROL SYSTEMWire Checks Voltage FoundTesting the Tub Displacement Switch 1 . Disconnect power to the unit Tub Displacement SwitchStrut Displacement Switch Testing the Strut Displacement SwitchCabinet Vibration Sensor Inertial Unbalance SwitchCabinet Vibration Absorber Testing the Inertial Unbalance Switch1998 Maytag Corporation SECTION 2. ELECTRICAL COMPONENTS & TESTING2 - 1 1 6 0 0 8 3 7 3 - 0Start Line Relay Operation SECTION 3. TROUBLESHOOTINGShuts OFF When Push-To-Start Button Re- leased Runs For Five Seconds Then Shuts OFFContinuesTo Tumble After The Wash Cycle Is Finished Temperature InputsTumbles Only Third Rinse Cycle Is Always ColdTicking or Knocking Noise In Spin Door Leaks“Thumping” Noise In Spin RF Radio Frequency Interference1998 Maytag Corporation T R O U B L E S H O O T I N GSECTION 3. TROUBLESHOOTING 1 6 0 0 8 3 7 3 - 01998 Maytag Corporation T R O U B L E S H O O T I N GSECTION 3. TROUBLESHOOTING 3 1 6 0 0 8 3 7 3 - 01998 Maytag Corporation T R O U B L E S H O O T I N GSECTION 3. TROUBLESHOOTING 1 6 0 0 8 3 7 3 - 01998 Maytag Corporation T R O U B L E S H O O T I N GSECTION 3. TROUBLESHOOTING 3 1 6 0 0 8 3 7 3 - 01998 Maytag Corporation T R O U B L E S H O O T I N GSECTION 3. TROUBLESHOOTING 1 6 0 0 8 3 7 3 - 01998 Maytag Corporation T R O U B L E S H O O T I N GSECTION 3. TROUBLESHOOTING 3 1 6 0 0 8 3 7 3 - 0SECTION 3. TROUBLESHOOTING 3 - 1T R O U B L E S H O O T I N G 1998 Maytag Corporation1998 Maytag Corporation T R O U B L E S H O O T I N GSECTION 3. TROUBLESHOOTING 3 - 1 1 6 0 0 8 3 7 3 - 03 - 1 T R O U B L E S H O O T I N GSECTION 3. TROUBLESHOOTING 1998 Maytag CorporationSECTION 3. TROUBLESHOOTING 3 - 1 T R O U B L E S H O O T I N Gindicators of the Quick Wash and Regular wash 1998 Maytag CorporationWasher MISCELLANEOUS INFORMATIONEnergy Usage WattagesDisconnect power to the unit SECTION 4. CONSOLER E M O V A L R E M O V A L VERTICAL SWITCHES Push ButtonHORIZONTAL SWITCHES Push-to-Start R E P L A C E M E N T1 . Disconnect power to the unit TIMER REMOVALR E P L A C E M E N T SECTION 4. CONSOLE 1998 Maytag Corporation1 6 0 0 8 3 7 3 - 0 DISASSEMBLY SECTION 5. CABINET ASSEMBLYDOOR ASSEMBLY & HINGES R E M O V A LFRONT PANEL Cabinet Vibration AbsorberDoor Latch Hoop Disconnect power to the unitR E M O V A L TOP COVERDOOR LOCK MECHANISM 1. Remove the front panel See Front Panel RemovalTroubleshooting FRONT SHROUD ASSEMBLYREMOVAL REMOVALHinge Removal CABINET ASSEMBLY w/REAR ACCESS PANELR E M O V A L 1998 Maytag Corporation SECTION 5. CABINET ASSEMBLY16008373-01 REAR REMOVAL SECTION 6. WATER-CARRYING COMPONENTSWATER VALVE FRONT REMOVALREMOVAL FROM CONSOLE WATER LEVEL PRESSURE SWITCHAIR DOME HOSE REMOVAL FROM OUTER TUBNOTE Using soap and water may lead to a potential leak DISPENSER ASSEMBLYREPLACEMENT/ROUTING 1. Disconnect power to the unit5. Disconnect the hoses attached to the dis- penser assembly PUMP ASSEMBLYFRONT WATER FLUME INJECTOR procedure is not followed properly1. Depress the locking tab on the face of the pump housing Pump Accessory KitCLEANING THE PUMP 1. Disconnect power to the unitR E M O V A L 1. Disconnect power to the unit DRAIN HOSE5. Reverse the previous steps for replacement SECTION 6. WATER CARRYING COMPONENTS 1998 Maytag Corporation16008373-01 SECTION 7. OUTER TUB & SPINNER ASSEMBLY DOOR BOOTBAFFLES R E M O V A L 1. Disconnect power to the unit2. Stretch the rear lip of the door boot onto the tub cover OUTER TUB COVERREPLACEMENT 1. Disconnect power to the unitSPIN BASKET ASSEMBLY w/BALANCE RING R E M O V A L 1. Disconnect power to the unitREPLACEMENT DRIVE PULLEY1. Disconnect power to the unit Figure7-6REPLACEMENT SPINNER TUB SUPPORTDisconnect power to the unit R E M O V A LR E M O V A L 1. Disconnect power to the unit SEAL SYSTEMFigure7-9 BEARINGS OUTER TUB ASSEMBLYCOUNTER WEIGHTS REMOVAL OF UPPER WEIGHT 1. Disconnect power to the unitINERTIAL UNBALANCE SWITCH STRUT ASSEMBLYStrut Displacement Switch 1. Disconnect power to the unit1. Disconnect power to the unit TUB DISPLACEMENT SWITCH1. Disconnect power to the unit REMOVAL1998 Maytag Corporation SECTION 7. OUTER TUB & SPINNER ASSEMBLY16008373-01 DRIVE MOTOR SECTION 8. MOTOR DRIVE SYSTEMDRIVE BELT R E M O V A LR E P L A C E M E N T MACHINE CONTROLR E M O V A L 1 . Disconnect power to the unit Console RemovalR E M O V A L MOTOR CONTROLDisconnect power to the unit R e m o v a l1998 Maytag Corporation SECTION 8 . MOTOR DRIVE SYSYTEM1 6 0 0 8 3 7 3 - 0 ELECTRICAL SCHEMATICS SECTION 9. ELECTRICAL SCHEMATICS & TIMER I N F O R M A T I O NPrior to Series SECTIONSECTION TIMER CHART - Prior to SeriesELECTRICAL SCHEMATICS 1998 Maytag CorporationSECTION ELECTRICAL SCHEMATIC - SeriesELECTRICAL SCHEMATICS 1998 Maytag CorporationSECTION TIMER CHART - SeriesELECTRICAL SCHEMATICS 1998 Maytag CorporationSECTION ELECTRICAL SCHEMATIC - SeriesELECTRICAL SCHEMATICS 1998 Maytag CorporationSECTION TIMER CHART - SeriesELECTRICAL SCHEMATICS 1998 Maytag CorporationSECTION ELECTRICAL SCHEMATIC - SeriesELECTRICAL SCHEMATICS 1998 Maytag CorporationSECTION N O T E SELECTRICAL SCHEMATICS 1998 Maytag CorporationDISPENSER ASSEMBLY CONTENTSSPECIFICATIONS WIRING INFORMATIONSECTION 1. MAH4000/MAH5500A CONTROL FACIA SECTION 2. SPECIFICATIONS Series 10 MAH4000 only SECTION 3. BASIC MACHINE OPERATIONSECTION 4. WASHER CONTROLS OVERVIEW Series 11 & LaterSECTION 5. CYCLE REVIEW Non-Max Cycle TimesAll Wash Time/Total Wash Cycle Cotton/SturdyThe following is an example of a Stain Cycle Stain CycleGeneral overview of Stain Cycle Suds detection during stain cycle16010199 SECTION 6. GENERAL COMPONENT - EXPLODED VIEWComponent Identification & Location Revised 7/00SECTION 7. ELECTRICAL INFORMATION 1. Discontinue power and water to the electrical power to the unitvice repair procedures SECTION 8. WATER CARRYING COMPONENTSSee Figure 1. Disconnect power and water to the machineOPERATION RECIRCULATION PUMPNOTE Indicator mark on hose for reinstallation Removal 1. Disconnect power and water to the washerDETERGENT HOSE 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 8-11See Figure Page Revised 7/00 SECTION 9. WIRING INFORMATION16010199 2000 Maytag Appliances Sales CompanyRevised 7/00 SERIES 10 - SCHEMATIC MAH4000 only16010199 2000 Maytag Appliances Sales CompanyRevised 7/00 SERIES 11 MAH4000 and MAH550016010199 2000 Maytag Appliances Sales CompanyRevised 7/00 SERIES 10 - TIMER CHART MAH400016010199 2000 Maytag Appliances Sales CompanyRevised 7/00 SERIES 11 - TIMER CHART MAH4000 & MAH5500A16010199 2000 Maytag Appliances Sales Company16008373-05 New Century Neptune Washer Service Manual SupplementMAYTAG TEARDOWN & WIRING INFORMATION DIAGNOSTIC/HELP CODE TABELSSECTION 4. ELECTRICAL COMPONENTS & TESTING Models covered in this manual supplement MAH5500B MAH7500ARevised 02/01 160104862001 Maytag Appliances Sales Company MAH5500B CONTROL FACIA SPECIFICATIONSSECTION 1. GENERAL INFORMATION MAH7500 CONTROL FACIAGeneral Flow Of A Complete Wash Cycle BASIC MACHINE OPERATIONWash Selections CYCLE SEQUENCESWash Time Tumble Tumbling Timetemperature INPUT WATER TEMPERATURETemperature Extra Heavy, QuickSECTION 2. WASHER CONTROLS OVERVIEW Features of MAH5500B LED WasherFeatures of MAH7500 LCD Washer BASIC CONTROL BOARD PHILOSOPHY FOR BOTH WASHERSSIGNAL MODE TEMPERATURE MODEdelay wash key will be locked out DELAY MODEPage 1-3 Extra Rinse Table DISPLAY CHARACTERISTICSOPTIONS MODE Door Locked LEDDOOR LOCK SWITCH INPUT PRESSURE SWITCH INPUTTEMPERATURE SENSOR INPUT INPUT MODIFICATIONS DEFINEDSTART/PAUSE INPUT DiagnosticsOUTPUT MODIFICATIONS DEFINED TACH INPUTCYCLE SEQUENCE DEFINITIONS Main Wash Target TemperaturesWATER VALVE OUTPUTS REDISTRIBUTION BLEACH DISPENSESUDS DETECTION DOOR LOCK PHILOSOPHY MISCELLANEOUSDOOR LOCK OPERATION MAH7500A POWER LOSS/FAILURESPECIAL FEATURES ADVERTISING MODELCD Washer SERVICE MODELED Washer 2-10LED WASHER Accessing Service ModeSERVICE MODE TABLE LED Washer SPECIAL TESTSSpeed Range QUICK SERVICE CYCLE2-12 DisplayedHELP CODES Accessing The Help CodesBOARD INPUT TEST BOARD OUTPUT TESTAccessing Diagnostic Codes DIAGNOSTIC CODESSection 5 DIAGNOSTIC/HELP CODE TABLES Clearing Diagnostic Code ListLCD WASHER ACCESSING SERVICE MODEService Tests User Interface TestsDuring a cycle Service Cycle2-16 Note This selection is valid only if a cycle is running 2-17Clear diagnostic codes Clear the entire list of diagnostic codes DIAGNOSTIC/HELP CODESexit diagnostic/help codes Return to SYSTEM CHECKHelp Section 3 DIAGNOSTIC/HELP CODE TABLESHELP CODES LISTING DescriptionTrigger HelpDescription Action to be TakenTrigger HelpDescription Action to be TakenDescription DIAGNOSTIC CODES LISTINGDiag TriggerTrigger DiagDescription Action to be TakenTrigger DiagDescription Action to be TakenSection 3. Teardown & Wiring Information GENERAL COMPONENT - EXPLODED VIEWComponent Identification & Location 16010486Glossary of Terms Spin Speed - This is the speed of the washer spinner during extraction 16010486 3-10Section 3. Teardown & Wiring Information Revised 2/01Grounded Components SECTION 4. ELECTRICAL COMPONENTS & TESTINGELECTRICAL TESTS Water Valve TestMachine Control Board Output TestINPUT/OUTPUT VOLTAGES LCD Washer INPUT/OUTPUT VOLTAGES LED WasherLCD Washer Membrane Pad ChecksOn the MAH5500B washer you can perform the Membrane Pad Check with the control console. See Section 2 Accessing Service Mode Membrane Pad Check LED WasherMOTOR CONTROL BOARD Motor Control AccessDRIVE MOTOR Drip Shield RemovalMachine Control Board Output Test Motor PhasesMotor Drive System Test Motor & Motor Control TestHEATER ASSEMBLY Heater Will Not Turn OnUser Selections Thermistor Temperature ChartHeating Targets Using Main Wash TemperingMICROPROCESSOR BOARD REMOVAL SECTION 5. TEARDOWN & WIRING INFORMATIONCONSOLE REMOVAL LCD MODELCONSOLE COVER PLUG CABINET ASSEMBLYDOOR LATCH HOOP DOOR LOCK MECHANISM RemovalPRESSURE SWITCH REAR ACCESS PANELRemoval 1. Discontinue power and water to the machine WATER SYSTEM COMPONENTSREINSTALLATION PUMP ASSEMBLYHEATER ASSEMBLY REMOVALSUMP COVER Thermistor RemovalREMOVAL Section 5. Teardown & Wiring Information WIRING INFORMATIONMAH5500B 1601048616010486 MAH7500Section 5. Teardown & Wiring Information Revised 10/00 2001 Maytag Appliances Sales CompanyCustomer Service 240 Edwards Street, S.E Cleveland, Tennessee Maytag Appliances Sales Company