Maytag MAH3000 Service Manual

Customer Service

TM

Washer

Service Manual

16010061

Compiled From

16008373, 16010199,

SAFETY PRECAUTIONS

This manual is to be used only by a Maytag Authorized Service Technician familiar with and knowledgeable of proper safety and servicing procedures and possessing high quality testing equipment associated with microwaves, gas, and electrical appliance repair.

All individuals who attempt repairs by improper means or adjustment subject themselves and others to the risk of serious or fatal injury.

USE ONLY GENUINE MAYTAG APPROVED FACTORY REPLACEMENT COMPONENTS.

16008373-01 SAFETY PRECAUTIONS

INTRODUCTION

Each model will be covered separately in a section pertaining only to its control system and internal components. Because the basic structure for all washers is the same, they will be covered generally without regard to model.

Model(s) covered in this manual:

MAH3000

For additional information on material covered in this manual, including safety issues, contact:

Maytag Appliances Sales Company

240 Edwards Street, S.E.

Cleveland, TN 37311

Phone: 423.472.3333

FAX: 423.478.6722

16008373-01 INTRODUCTION

i

CONTENTSCONTENTS

CONTENTS

CONTENTSCONTENTS

INTRODUCTIONINTRODUCTION

INTRODUCTION

INTRODUCTIONINTRODUCTION CONTENTSCONTENTS

CONTENTS

CONTENTSCONTENTS

SECTION 1. GENERAL INFORMATIONSECTION 1. GENERAL INFORMATION

SECTION 1. GENERAL INFORMATION

SECTION 1. GENERAL INFORMATIONSECTION 1. GENERAL INFORMATION

PRE-INSTALLATION REQUIREMENTS............................................................................................................ 1 - 1

UNCRATING....................................................................................................................................................................... 1 - 1

INSTALLATION.................................................................................................................................................................. 1 - 2

GROUNDING POLARITY CHECKS ...................................................................................................................... 1-4

SPECIFICATIONS............................................................................................................................................................. 1-4

WASHER CONTROLS................................................................................................................................................... 1 - 5

INPUT DEFINITIONS..................................................................................................................................................... 1 - 6

OUTPUT DEFINITIONS............................................................................................................................................... 1 - 8

CYCLE SEQUENCE DEFINITIONS................................................................................................................... 1-10

MISCELLANEOUS....................................................................................................................................................... 1-11

Door Latch Switch Monitoring.................................................................................................................... 1-11

Door Lock/Spin Control................................................................................................................................... 1-11

Redistribution ......................................................................................................................................................... 1-11

Push-To-Start Relay Operation .................................................................................................................... 1-12

CYCLE REVIEW............................................................................................................................................................. 1-13

GENERAL COMPONENT EXPLODED VIEW ............................................................................................ 1-14

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1-11-1

1-1

1-11-1

SECTION 2. ELECTRICAL COMPONENTS & TESTINGSECTION 2. ELECTRICAL COMPONENTS & TESTING

SECTION 2. ELECTRICAL COMPONENTS & TESTING

SECTION 2. ELECTRICAL COMPONENTS & TESTINGSECTION 2. ELECTRICAL COMPONENTS & TESTING

ELECTRICAL TEST EQUIPMENT ........................................................................................................................ 2 - 1

ELECTRICAL TESTS ..................................................................................................................................................... 2-2

Grounded Components..................................................................................................................................... 2-2

Voltage Checks ......................................................................................................................................................... 2-2

Water Valve Test....................................................................................................................................................... 2-2

Wax Motor Check/Door Lock Mechanism............................................................................................ 2-2

Timer & Console Switches ............................................................................................................................... 2-3

Timer Input Charts.................................................................................................................................................. 2-3

Machine Control....................................................................................................................................................... 2-5

DRIVE MOTOR ................................................................................................................................................................... 2-7

MOTOR CONTROL BOARD ...................................................................................................................................... 2-7

Motor & Motor Control Test............................................................................................................................ 2-8

Motor Phase Test .................................................................................................................................................... 2-8

Motor Windings Check ....................................................................................................................................... 2-9

Tachometer Circuit Diagnostics ................................................................................................ .............2-10

UNBALANCE CONTROL SYSTEM .................................................................................................................. 2-11

Tub Displacement Switch............................................................................................................................... 2-12

Strut Displacement Switch ............................................................................................................................ 2 -1 2

Inertial Unbalance Switch ............................................................................................................................... 2-13

Cabinet Vibration Sensor ............................................................................................................................... 2-13

Cabinet Vibration Absorber ......................................................................................................................... 2-13

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2-12-1

2-1

2-12-1

16008373-01

CONTENTS

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SECTION 3. TROUBLESHOOTINGSECTION 3. TROUBLESHOOTING

SECTION 3. TROUBLESHOOTING

SECTION 3. TROUBLESHOOTINGSECTION 3. TROUBLESHOOTING

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3-13-1

3-1

3-13-1

DIAGNOSTIC FLOW CHARTS....................................................................................................3-4

Fills and Will Not Tumble................................................................................................................................... 3-4

Washer Overfills....................................................................................................................................................... 3-5

Washer Will Not Spin ........................................................................................................................................... 3-6

Machine Stalls During Spin............................................................................................................................... 3-8

Maximum Spin Speed Is Not Reached ................................................................................................... 3-9

Wash Cycle Takes Longer Than Normal .............................................................................................. 3-10

Suds Coming Out Of Door............................................................................................................................. 3 - 10

Washer Will Not Start ........................................................................................................................................ 3-11

Motor Phase Test ................................................................................................................................................. 3-12

TIMER TEMPLATE OVERLAY ............................................................................................................................. 3- 13

MISCELLANEOUS INFORMATION.................................................................................................................. 3-14

SECTION 4. CONSOLESECTION 4. CONSOLE

SECTION 4. CONSOLE

SECTION 4. CONSOLESECTION 4. CONSOLE

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4-14-1

4-1

4-14-1

REMOVAL............................................................................................................................................................................. 4-1

VERTICAL SWITCHES.................................................................................................................................................. 4-2

HORIZONTAL SWITCHES.......................................................................................................................................... 4-2

TIMER REMOVAL/REPLACEMENT.................................................................................................................... 4-3

SECTION 5. CABINET ASSEMBLYSECTION 5. CABINET ASSEMBLY

SECTION 5. CABINET ASSEMBLY

SECTION 5. CABINET ASSEMBLYSECTION 5. CABINET ASSEMBLY

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5-15-1

5-1

5-15-1

DOOR ASSEMBLY & HINGES ................................................................................................................................. 5-1

Cabinet Vibration Absorber ............................................................................................................................ 5-2

Door Latch Hoop ..................................................................................................................................................... 5-2

FRONT PANEL................................................................................................................................................................... 5-2

TOP COVER......................................................................................................................................................................... 5-3

DOOR LOCK MECHANISM ....................................................................................................................................... 5-3

FRONT SHROUD ASSEMBLY................................................................................................................................. 5-4

CABINET ASSEMBLY W/REAR ACCESS PANEL...................................................................................... 5-5

SECTION 6. WATER CARRYING COMPONENTSSECTION 6. WATER CARRYING COMPONENTS

SECTION 6. WATER CARRYING COMPONENTS

SECTION 6. WATER CARRYING COMPONENTSSECTION 6. WATER CARRYING COMPONENTS

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6-16-1

6-1

6-16-1

WATER VALVE................................................................................................................................................................... 6 -1

WATER LEVEL PRESSURE SWITCH.................................................................................................................. 6-2

AIR DOME HOSE.............................................................................................................................................................. 6-2

DISPENSER ASSEMBLY............................................................................................................................................. 6-3

FRONT WATER FLUME INJECTOR..................................................................................................................... 6-4

PUMP ASSEMBLY.......................................................................................................................................................... 6-4

Pump Accessory ..................................................................................................................................................... 6-5

DRAIN HOSE....................................................................................................................................................................... 6-6

SECTION 7. OUTER TUB & SPINNER ASSEMBLYSECTION 7. OUTER TUB & SPINNER ASSEMBLY

SECTION 7. OUTER TUB & SPINNER ASSEMBLY

SECTION 7. OUTER TUB & SPINNER ASSEMBLYSECTION 7. OUTER TUB & SPINNER ASSEMBLY

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7-17-1

7-1

7-17-1

BAFFLES................................................................................................................................................................................ 7 - 1

DOOR BOOT........................................................................................................................................................................ 7 -1

OUTER TUB COVER...................................................................................................................................................... 7-2

SPIN BASKET ASSEMBLY W/BALANCE RING .......................................................................................... 7-3

DRIVE PULLEY.................................................................................................................................................................. 7-4

SPINNER TUB SUPPORT........................................................................................................................................... 7-5

16008373-01

CONTENTS

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SEAL SYSTEM .................................................................................................................................................................. 7-6

OUTER TUB ASSEMBLY............................................................................................................................................ 7-7

BEARINGS............................................................................................................................................................................ 7-7

COUNTER WEIGHTS.................................................................................................................................................... 7-7

STRUT ASSEMBLY........................................................................................................................................................ 7-8

Strut Displacement Switch ............................................................................................................................... 7-8

INERTIAL UNBALANCE SWITCH......................................................................................................................... 7-8

TUB DISPLACEMENT SWITCH............................................................................................................................. 7-9

SECTION 8. MOTOR DRIVE SYSTEMSECTION 8. MOTOR DRIVE SYSTEM

SECTION 8. MOTOR DRIVE SYSTEM

SECTION 8. MOTOR DRIVE SYSTEMSECTION 8. MOTOR DRIVE SYSTEM

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8-18-1

8-1

8-18-1

DRIVE BELT ......................................................................................................................................................................... 8 -1

DRIVE MOTOR ................................................................................................................................................................... 8 - 1

MACHINE CONTROL.................................................................................................................................................... 8-2

MOTOR CONTROL ......................................................................................................................................................... 8-3

SECTION 9. ELECTRICAL SCHEMATICSSECTION 9. ELECTRICAL SCHEMATICS

SECTION 9. ELECTRICAL SCHEMATICS

SECTION 9. ELECTRICAL SCHEMATICSSECTION 9. ELECTRICAL SCHEMATICS

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9-19-1

9-1

9-19-1

Schematic Prior to Series 17 .......................................................................................................................... 9 - 1

Timer Chart Prior to Series 17 ....................................................................................................................... 9-2

Schematic Series 17.............................................................................................................................................. 9-3

Timer Chart Series 17 .......................................................................................................................................... 9-4

Schematic Series 18.............................................................................................................................................. 9-5

Timer Chart Series 18 .......................................................................................................................................... 9-6

Schematic Series 19.............................................................................................................................................. 9-7

16008373-01

CONTENTS

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SECTION 1. GENERAL INFORMATION

PRE-INSTALLATION REQUIREMENTS

NOTE: Proper installation is the responsibil-

ity of the purchaser .

Checkpoints for proper installation:

• Properly grounded electrical outlet is re-

quired. Use 15 amp fuse or compatible circuit breaker for electrical service.

• Standpipe Drain System must accept 1½"

O.D. drain hose. Standpipe height of 36" is recommended.

NOTE: If drain standpipe is in excess of 5 feet above floor level, install pump accessory kit, part number 22002136.

• This unit is not equipped with a siphon

break, and the drain hose must be elevated to a minimum height of 24". A 36" high standpipe is recommended. For all installations the drain hose must be supported by the drain hose strap on the back of the washer.

• Hot and Cold water faucets must be within

four (4) feet of the back of the washer . This allows quick access for immediate water shut off.

• Water heater should be set to deliver a

minimum of 120ºF (49º C) hot water to the washer.

• Do not store or operate washer in tem-

peratures below freezing. This can cause damage to the pump, hoses and other components.

cause an extended fill time. Refer to the troubleshooting section for more information regarding a solution for slow fill situations.

• Best performance is obtained with the washer installed on a solid floor. Wood floor constructions may need to be reinforced to minimize vibration from unbalanced load situations. Carpets and soft tile surfaces are also contributing factors to vibration and/or movement during the spin cycle. Never install washer on a plat-

form or weak support structure.

UNCRATING INSTRUCTIONS

NOTE: The following steps must be per-

formed in the correct order to ease uncrating.

1. Remove the carton by cutting only in marked areas of the carton. CAUTION:

Hoses are connected to the washer.

2. Carefully remove any packaging materials from the outside of the washer.

IMPORTANT: DO NOT cut the red straps securing the power cord and inlet hoses at this time. They will be removed later

during installation.

3. Remove the accessory package from inside the tub.

4. Remove the crate bottom from the washer by removing crate bottom wire clips.

• Water pressure of 20 - 120 P.S.I. is required to fill the washer in the appropriate time frame. Pressures of less than 20 P.S.I. may

16008373-01 SECTION 1. GENERAL INFORMATION

1-1

INSTALLATION

1. Two separate red shipping straps are used to secure the machine for shipping purposes and to secure the power cord with the water inlet hoses. Remove the straps in the following sequence:

A . Locate the metal buckles securing the red

straps which extend through slots in the rear wall of the cabinet. The buckles are positioned in the center of the red straps. Carefully cut the red straps, and remove the metal buckles. NOTE: Cut the straps as close to the buckles as possible. Discard the buckles.

Figure 1-2

3. Locate the two (2) ½" hex head shipping bolts extending up through the bottom of the base (Figure 1-4). The shipping bolts are near the center of the base toward the front of the washer. Remove both bolts, freeing the tub and suspension. Do not be alarmed should the tub assembly shift when the last bolt is removed. Some shifting of the tub is normal.

Figure 1-1

Figure 1-3

B. Grasp each loose strap individually and

pull the strap to remove it from the cabinet. Discard the strap (Figure 1-2).

2. Tip washer slightly forward. Loosen rear leveling leg lock nuts. Tip washer back slightly to loosen front leveling leg lock nuts (Figure 1-3).

16008373-01 SECTION 1. GENERAL INFORMATION 1-2

Turn on the water and check for leaks (Figure

1-5). Note the H and C designations on the water valve bracket for the Hot and Cold hoses.

Figure 1-4

4. Slide the washer into position and check the levelness and stability of the washer. If necessary, slide the washer out of position to either raise or lower the leveling leg as required to level and stabilize the washer securely on all four legs. Slide the washer back into position to confirm levelness to the floor. When the washer is level, tighten the locking nuts up against the base of the washer. This will secure the leveling legs in place.

5. Install the rubber feet, found in the installation package, on all four (4) legs (Figure

1-3).

6. Pull the drain hose vertically to the drain strap . Then route the drain hose through the drain hose strap on the back of the washer and snap into the plastic hook of the strap.

7. Install gooseneck end of drain hose into drain standpipe. Be sure the connection is not airtight between the drain hose and standpipe. Standpipe must be at least 24" high. 36" height is recommended.

8. Connect inlet hoses to water supply using screen washers (found in the installation package) at faucet connections, with the domed screen facing the faucet. Attach hoses to the faucets and the water valve.

Figure 1-5

NOTE: Accessory inlet hoses are available in various lengths, up to 10 feet.

GROUNDING POLARITY CHECKS

The receptacle used for all Maytag products operating on 120 Volts AC must be properly grounded and polarized.

The power cord should be equipped with a three (3) PRONG POLARIZED GROUNDING PLUG FOR PROTECTION AGAINST SHOCK HAZARD and should be plugged directly into a properly grounded and polarized receptacle.

CAUTION: Do not cut or remove the grounding prong from this plug.

It is the responsibility of the person installing the appliance to ensure it is adequately grounded and polarized at the point of installation. Local conditions and requirements should be taken into consideration. In cases where only a two (2) prong receptacle is available, it is the personal responsibility of the customer to have it replaced with a properly grounded and polarized three (3) prong receptacle (Figure 1-6).

16008373-01 SECTION 1. GENERAL INFORMATION

1-3

Plug power cord into a properly grounded 120 volt AC-approved electrical service. This must be protected by a dedicated 15 amp fuse or circuit breaker.

All grounding and wiring should be performed in accordance with national and local codes.

USE OF ADAPTERS IS NOT RECOMMENDED.

Figure 1-6

SPECIFICATIONS

CAPACITY 3.1 Cubic Feet

ELECTRICAL 120 volt s, 60 Hz; Requi r es 15 am p circ uit b r eaker or fus ed el ect ri cal

supply. Power cord must be connected to a properly grounded and

supply. Power cord must be connected to a properly grounded and pol arized o utlet .

pol arized o utlet .

MOTOR Switched Reluctance Motor controlled by a microprocessor motor

control board. Motor pulley ratio (motor to spinner RPM) 14 to 1.

POWER U SAGE Motor Input : During Wash Tumble - 150 Watts

(Wattage readings taken with no clothes in spinner.)

TU MBL ER SPEED Wash Tumble 47-51 RPM

Rin se Tu m ble 47-5 1 RPM

Rin se Tu m ble 47-5 1 RPM High Speed Spin 800 RPM (± 50 RPM based upon optim um

High Speed Spin 800 RPM (± 50 RPM based upon optim um

WATER USAGE Water pressure should be 20-120 p.s.i. (1.06-8.4 4 kg/cm ) at inlet hose

connection. Total water usage is approximately 25 gallons; varies w ith

connection. Total water usage is approximately 25 gallons; varies w ith cl othe s lo ad. W ater fill in th e spi n b asket w it h no clo thes, m easured

cl othe s lo ad. W ater fill in th e spi n b asket w it h no clo thes, m easured near the rear seam of the spin basket.

near the rear seam of the spin basket. WASH LEVEL 3-4 inches

WASH LEVEL 3-4 inches RINS E LEVEL 4-5 inc hes

RINS E LEVEL 4-5 inc hes

HOSE LENGTHS Four-foot inlet hoses with inlet washers and attaches to water valve.

DIMENSIONS Cab ine t di mens io ns: 27" (68.58c m) W x 27 ½ ” (69.85 cm ) D x 36"

WEIGHT (Approx.) Un car to ned 190lb . (86 kg.) Ap p ro x .

S CREW & BO LT T ORQ UES Bolt, Counter Weight 7in. lbs. (± 3in.lbs)

Drain hose attaches to pump and will accomm odate 36" dr ain stand

Drain hose attaches to pump and will accomm odate 36" dr ain stand pipe.

pipe.

(91. 44cm )H.

Crat ed 200lb . (91 kg) . Ap p ro x .

Bolt, Spin Pulley 30in. lbs (± 3in. lbs)

Bolt, Spin Pulley 30in. lbs (± 3in. lbs) Bolt, Belt Adjuster 90in. lbs (± 10in. lbs)

Bolt, Belt Adjuster 90in. lbs (± 10in. lbs) Screw, Front Baffle 25in. lbs (± 3in. lbs)

Screw, Front Baffle 25in. lbs (± 3in. lbs) Screw, Rear Baffle 18.5in. lbs (± 3in. lbs)

Screw, Rear Baffle 18.5in. lbs (± 3in. lbs) Clam p, Ho ses 15+ in. lb s

Clam p, Ho ses 15+ in. lb s Nuts, Spinner Support 18in. lbs (± 3in. lbs)

Nuts, Spinner Support 18in. lbs (± 3in. lbs) Nuts, Suspension Struts 7in. lbs (± 3in. lbs)

Nuts, Suspension Struts 7in. lbs (± 3in. lbs)

Du ring Rinse Tu m ble - 17 5 Watt s

Du ring Rinse Tu m ble - 17 5 Watt s To p Spin - 80 0 Wa tt s

To p Spin - 80 0 Wa tt s

spin performance.)

16008373-01 SECTION 1. GENERAL INFORMATION 1-4

WASHER CONTROLS

The control system in the Neptune horizontal axis washer generally consists of a timer and microprocessor-based machine control. These receive input signals and send output signals to other equipment in the washer, including the motor and motor control, user input switches, user indicator lights, the door latch and lock assembly, water valves, drain pump, unbalance switches, dispenser actuator wax motors, a pressure switch, and a tub light.

The machine control has direct control of these items:

- Motor speed and direction, through signals to the motor control.

- Door lock wax motor.

- Hot and cold water valves, with an input signal from the timer and pressure switch.

- Timer motor.

- On Light.

In general, the timer dial is rotated to a desired setting, selects the cycles options using the option switches, and starts the washer. The machine control reads the inputs from the timer, option switches and pressure switch then send output signals to the motor control and other components based upon those inputs. When the machine control has completed its set of instructions for the specific timer setting, it energizes the timer motor output to advance the timer to the next increment, reads a new set of input signals from the timer, and acts upon them. This continues until the cycle is complete. (See Figure 1-7 & 1-8 for a generic representa-

tion of the Neptune washer control system.)

Prior To Series 17

Figure 1-7

16008373-01 SECTION 1. GENERAL INFORMATION

1-5

Figure 1-8

INPUT DEFINITIONS

DOOR LOCK SWITCH INPUT

When input is present, this is indication the washer door is locked. The machine controller will not command the spinner to spin faster than 50 rpm when the input is not present prior to spin.

END-OF-CYCLE SIGNAL INPUT

The End-of-Cycle Signal Input is energized through a user input switch on the control panel. When this is energized and the cycle has finished, the machine control will sound the End-of-Cycle signal (See End-Of-Cycle Sig-

nal Output).

FABRIC SELECTION INPUTS

The Fabric Selection Inputs are energized through a user input switch on the control panel. The machine control reads these inputs to determine which cycles should be run when the washer is started.

MAX EXTRACT INPUT

The Max Extract Input is energized through a user input switch on the control panel. When input is energized, the machine control will modify the final spin profile to the max extract profile.

Series 17 & Later

NOTE: If the user selects the Hand Washables fabric selection, all spins will follow the Max Extract profile regardless of whether the user selects the Max Extract option.

OUT-OF-BALANCE INPUT

The Out-of-Balance Input Signal is provided by three normally-closed switches wired in sequence. If any of these switches opens due to an out-of-balance condition, the signal will be momentarily lost (See Unbalance Control

System).

PRESSURE SWITCH INPUT

The input signal from the Pressure Switch serves two purposes. It supplies power for the water valves and provides an indication to the machine control as to whether the commanded water level has been reached.

When the timer advances into a cycle sequence that calls for water, power is supplied through the timer to either the wash or rinse level contacts on the pressure switch. When the water level in the tub is below the full level for that setting, the pressure switch circuit is closed, supplying power for the water valves to the machine control. When the water level switch is satisfied, the pressure switch circuit is opened and power for the water valves is no longer passed to the machine control. The

16008373-01 SECTION 1. GENERAL INFORMATION 1-6

machine control interprets this loss of power as an indication that the water level has reached the full level.

When the washer is at the "full" level and the timer is set in a Prewash Tumble, Main Wash Tumble, Light Wash Tumble, or Rinse Tumble increment, the machine control will begin the sequence timing defined for each cycle and fabric selection setting (See Cycle Sequence

Definitions).

During the drain and spin increments after the main wash, first rinse, second rinse, and extra rinse increments, the wash side circuit in the pressure switch is closed. When the water level drains below the wash full level, the circuit will close and energize the pressure switch input. The machine control interprets this signal (not to energize the water valve outputs) to measure how quickly the washer is draining. If the machine control commands a spin speed above 51 rpm before the pressure switch input is energized, it will drop the speed to 0 rpm and hold there until the pressure switch input is energized. An additional delay equal to the length of time elapsed will occur before the pressure switch input is energized. If four minutes elapse without the pressure switch input being energized, the machine control will energize the timer motor output to advance the timer into the next increment and continue with the cycle.

TACH INPUT

The tach input is a feedback signal from the motor control. It provides eight pulses per revolution of the switched reluctance motor. The motor runs at 14 times the speed of the spinner (14:1 belt ratio). The tach input is used for monitoring speed and out-of-balance detection (See Tachometer Circuit Diagnostics).

If the machine control commands a motor speed and direction but does not sense a tach input signal within five seconds, it will disengage the line relay to stop the washer. This generally indicates a locked rotor or a malfunction in the motor control.

If the machine control senses a tach input signal when it is not commanding the motor to run, it will disengage the line relay to stop the washer.

If the machine control commands a coast down from final spin speed but is still receiving a tach input signal after two minutes, it will disengage the line relay to stop the washer.

TEMPERATURE SENSOR INPUT

A thermistor is located in the water valve to monitor the blended incoming water temperature. The machine control uses this input signal to regulate the water temperature with the warm or cold wash or warm rinse temperature selections (See Water Valve Outputs).

START/STOP INPUT

The start/stop input is energized by the momentary Push-to-Start/Stop Switch. If this input is energized when a cycle is in progress, the machine control will disengage the line

TIMER INPUTS

The Timer Input signals are energized through the cams in the timer. The timer operates with a 30 second drive cycle and a 5.8 second advance time (See Timer Input Charts).

relay, both water valve output signals, the door lock wax motor signal, the timer motor output signal, and the on-light output signal. If this input is energized when a cycle is not in progress, the machine control will energize the line relay and begin the cycle sequence as defined by the timer and user input switches

(See Push-To-Start/Line Relay Operation).

16008373-01 SECTION 1. GENERAL INFORMATION

WATER TEMPERATURE INPUTS

The Water Temperature inputs are two separate signals defined by a user input switch on the control panel. The machine control interprets these signals to determine what the water temperature should be for each fill (See

W ater Valve Outputs).

1-7

OUTPUT DEFINITIONS

DOOR LOCKED LIGHT OUTPUT

NOTE: This section applies only to washers

between Series 10 and 16. The "Door Locked" lights on washers from Series 17 and after are controlled by a "Door Locked" light switch.

END-OF-CYCLE SIGNAL OUTPUT

The End-Of-Cycle Signal Output is an internal signal on the machine control between the microprocessor and annunciator. The end-ofcycle signal sounds when a wash cycle is finished and the End-Of-Cycle Input is energized. The end-of-cycle signal sounds as six pulses in a 0.35 seconds on, 0.15 seconds off pattern

(See Timer Input Charts).

The Door Locked Light Output signal powers a 1/3 watt neon indicator lamp on the control panel. This output is first energized when the Door Lock Wax Motor Output is energized. At the end of the cycle, it remains energized for 50 seconds after the Door Lock Switch Input shuts down. This delay allows the wax motor to fully retract and unlock the door.

NOTE: The washer will continue to tumble at the end of cycle until this 50 second delay is elapsed.

DOOR LOCK WAX MOTOR OUTPUT

The Door Lock Wax Motor Output signal powers a wax motor in the door lock assembly. The wax motor extends to drive the door lock system for the washer.

If the washer is started with the timer set in a Prewash Tumble, Main Wash Tumble, or Light Wash Tumble increment, the machine control will wait for three minutes before energizing the Door Lock Wax Motor Output. This delay is not affected by water level. This output remains energized until the end of the cycle.

If the washer is started with the timer set in a Prewash Drain, Bleach Dispense, Spin1, Rinse Tumble, Spin2, or Spin3 increment, the machine control will energize this output immediately.

ON LIGHT OUTPUT

NOTE: This section applies only to washers

from Series 17 and after. The "Door Locked" lights on washers between Series 10 and 16 are controlled by a cam on the timer.

The Door Locked Light Output signal powers a 1/3 watt neon indicator lamp on the control panel. This output is energized when the washer is operating in a wash or spin cycle. Note that the "On" light is not illuminated when the timer is in a delay increment.

TIMER MOTOR OUTPUT

The machine control energizes the Timer Motor Output to allow for variable-length timer increments. If the washer is started with the timer set in a Prewash Tumble, Main Wash Tumble, Light Wash Tumble, or Rinse Tumble increment, the machine control will not begin the cycle sequence timing until the water level reaches the appropriate level. The Timer Motor Output is disengaged during this time.

The machine control will stop the washer by disengaging the line relay if the following occur: 1) The machine control energizes the timer motor until it senses a timer change. 2) The timer motor remains energized for five minutes while the timer inputs change (See

Timer Input Charts).

The machine control will continuously energize the Door Lock Wax Motor Output during the final (Spin 3) sequence until 30 seconds before the washer begins to coast from the final speed.

16008373-01 SECTION 1. GENERAL INFORMATION 1-8

The machine control counts the number of rinses during a normal wash cycle. In the first and second Rinse Tumble increments, the machine control will energize the Timer Motor Output as soon as the Pressure Switch Input is no longer energized, indicating that the water has reached the full level. In the third and fourth (if Extra Rinse is selected) Rinse Tumble increments, the machine control will energize the Timer Motor Output 30 seconds after the Pressure Switch Input is no longer asserted.

The machine control will energize the Timer Motor Output when the timer is set into a Spin1, Spin2, or Spin3 increment 30 seconds before the end of the spin. It will remain energized until the timer inputs change.

TORQUE OUTPUT

The machine control commands motor speed and direction through the Torque Output from the machine control to the motor control. This output is a pulse width modulated (PWM) signal (See Section 2: Machine Control).

circuit opens and de-energizes the Pressure Switch Input on the machine control, which de-energizes the Water Valve Outputs.

The machine control will read the Water Temperature Sensor Input to determine the blended water temperature passing through the water valve. In a warm wash fill, the machine control will first energize both the hot and cold Water Valve Outputs for five seconds then de-energize the cold Water Valve Output and monitor the water temperature. When the Water Temperature Sensor Input passes the warm threshold (approx. 20 K Ohms), the machine control will re-energize the cold output for the remainder of the fill.

In a cold wash fill, the machine control will first energize only the cold Water Valve Output for five seconds. It then energizes the hot Water Valve Output and monitors the Water Temperature Sensor Input until it passes the cold threshold (approx. 44 K Ohms), when it de-energizes the Hot Water Valve Output for the remainder of the fill.

Vcc REFERENCE VOLTAGE OUTPUT

The Vcc Outputs are a reference voltage for many of the signal outputs. On the machine control, the Vcc outputs are 24 VDC referenced to the 120 VAC neutral line.

WATER VALVE OUTPUTS

The machine control determines whether the hot or cold Water Valve Outputs should be energized during each timer increment, but it only gates the power to the water valves, it does not directly provide that power. When the timer is in an increment calling for water, power passes from the timer to the wash or rinse level circuit in the pressure switch. When the water level is below the full level, the pressure switch circuit is closed and the power passes to the machine control. The machine control gates the power to the hot and cold Water Valve Outputs. When the pressure switch senses that the full level is reached, the

If the user selects a warm rinse temperature, the machine control will count the rinses and allow a warm rinse fill only on the third and fourth (if the user also selects the Extra Rinse option) rinses. The first two rinses will be cold only. The machine control does not regulate water temperature during the rinses.

NOTE: If the user chooses the Easy Care/ Perm Press fabric selection, all rinse fills will be cold regardless of whether the user also selected the warm rinse temperature.

16008373-01 SECTION 1. GENERAL INFORMATION

1-9

CYCLE SEQUENCE DEFINITIONS

NOTE: Refer to Section 2: Timer Input Charts

for information on the timing of each cycle sequence.

BLEACH DISPENSE

In a Bleach Dispense increment, the machine control will follow the same tumble pattern and speed as in a Main Wash Tumble increment.

DELAY

During a Delay increment, the door Lock Wax Motor Output, Door Locked Light Output (Series 17 and later only), Motor Torque Output, "On" light (Series 10 to 16 only), and Water Valve Outputs are de-energized. Note that the Delay indicator is energized through a cam on the timer.

EXTRA RINSE

When the user selects the Extra Rinse option, the spin increment following the third rinse will follow the Spin2 cycle sequence. The Timer Motor Output will be energized 60 seconds prior to the end of the spin cycle sequence and will remain energized to advance the timer through the "Off" increment into the Rinse Tumble increment.

washers only) will de-energize and the Endof-Cycle Signal will sound if the user had selected the End-of-Cycle Signal option.

LIGHT WASH TUMBLE, MAIN WASH TUMBLE, and RINSE TUMBLE

The machine control will tumble the washer at the pattern and speed defined by the Fabric Selection Inputs (See Cycle Review). Each tumble will start only after the previous tumble has completely stopped. The machine control will reverse the tumble direction after each pause. The machine control will continue to tumble the washer until the timer inputs change.

In a Light Wash Tumble or Main Wash Tumble increment, the machine control will de-energize the line relay if the washer continues to tumble for 29 minutes. This would only occur if the timer were to stall (See Section 1:

Timer Motor Output and Section 2: Timer Input Chart).

PREWASH DRAIN

During a prewash drain increment, the washer will tumble at the same speed and in the same pattern as in the Prewash Tumble increment for the fabric selection. The Door Lock Wax Motor Output will be energized during this increment (See Prewash Tumble).

If the Extra Rinse option is not selected, this spin will follow the Spin3 cycle sequence and the Timer Motor Output will be energized 30 seconds prior to the end of the final spin.

IDLE

The Idle increment follows the final spin increment in each cycle. If the Door Lock Switch Input is energized when the timer advances into the Idle increment at the end of the cycle, the machine control will tumble the washer until 50 seconds after the Door Lock Switch input is no longer energized. This allows time for the Door Lock Wax Motor to fully retract. At this time, the Door Lock Light Output (washers between Series 10 and 16 only) or the "On" Light Output (Series 17 and later

16008373-01 SECTION 1. GENERAL INFORMATION 1-10

PREWASH TUMBLE

When the timer is set into a Prewash Tumble increment, the machine control will tumble at 51 rpm in the following tumble pattern:

Cycle Tumble-Pause Pattern Cotton/Sturdy 6 sec. - 24 sec. Easy Care/Perm Press 6 sec. - 24 sec. Delicates 6 sec. - 24 sec. Hand Washables 3 sec. - 27 sec.

In a Prewash Tumble increment, the machine control will de-energize the line relay if the washer continues to tumble for 15 minutes. This would only occur if the timer were to stall

(See Section 1: Timer Motor Output and Section 2: Timer Input Chart).

MISCELLANEOUS

Door Latch Switch Monitoring

At the end of a cycle, when the timer advances into the Idle increment, the machine control will keep the line relay energized until it loses power when the door latch switch opens. This guards against the switch contacts welding closed. In this condition, the machine control will limit what additional cycles can be run before the door is opened as follows:

Washers between Series 10 and 16

The machine control will allow the washer to restart only if the user sets the timer into a Rinse Tumble or Spin3 increment.

Washers from Series 17 and Later

The machine control will allow the washer to restart in any setting. After that cycle completes, the user must open the door before the machine control will allow a third cycle to start.

Door Lock/Spin Control

control will energize the timer motor output until the timer inputs change so the washer can proceed with the cycle.

At the end of spin sequence, if the door lock switch input is de-energized before the washer drops below 91 rpm, a hardware circuit on the machine control will interrupt the torque output signal, which forces the motor control to 0 rpm, and energize the door lock wax motor circuit to lock the door. This hardware circuit will keep the door lock wax motor circuit energized until the door lock switch input signal is energized.

Redistribution

The machine control commands a distribution profile speed ramp from 0 rpm to 85 rpm at the beginning of each high speed (above 100 rpm) spin. When the washer reaches 85 rpm, the machine control monitors the Tach Input to determine if the speed varies through one revolution of the spinner basket. If it senses a high enough variation in speed (suggesting an out-of-balance condition in the clothing load), it will drop the spinner speed to 0 rpm and force a short reverse tumble to redistribute the clothing load before resuming the spin. If any of the out-of-balance switches trip and open the out-of-balance input circuit at a speed below 500 rpm, the machine control will also drop the speed to 0 rpm and force the reverse tumble to redistribute the clothing load.

When the machine control begins a spin increment, it will not command spin speed above 51 rpm unless the door lock switch input is energized. At the start of a spin increment, the machine control will drop the speed to 0 rpm then tumble until the switch is energized. At that point, it will restart the spin sequence. If the door lock switch is not energized after 2 minutes of tumbling, the machine

16008373-01 SECTION 1. GENERAL INFORMATION

1-11

16008373-01 SECTION 1. GENERAL INFORMATION 1-12

The following rules determine the maximum number of redistribution attempts that will be allowed in each spin step before the machine control skips the step and continues with the spin profile (See Section 2: Unbalance Con-

trol System).

STOPPING THE WASHER

1. With the washer running, power is supplied to the machine control and washer from gray wire no. 26 through the line relay.

2. When the user presses the push-to-start button, a signal is sent to the machine control through red wire no. 28 telling the washer to shut down.

3. The machine control opens the internal logic switch which de-energizes the line relay.

4. When the user releases the push-to-start button, power is removed from the machine control and washer (Black wire no.

27).

STARTING THE WASHER

1. With the door closed, press the push-to start switch.

2. The red no. 28 wire sends a signal to the machine control to start running.

3. 120 VAC is supplied to the machine control board through black wire no. 27.

4. The machine control closes an internal switch to energize the line relay.

5. When the push-to-start button is released, power remains supplied to the machine control and the washer from gray wire no. 26 through the line relay.

Push-To-Start Relay Operation

PUSH TO START SWITCH

LINE RELAY

MACHINE CONTROL BOARD

120 VAC POWER FRO M MACH INE CONT ROL BOARD

INTERN AL LOGI C SWITCH

120 VAC LINE (When door is

closed)

GY 26

BK 27

RD 28

120 VAC Line To Timer & Motor Co ntrol Board

NO

COM

Figure 1-8

CYCLE REVIEW

Main Wash Time/Total Cycle Time - Minutes (See Notes).

N on-M ax Extract Cotton/ Sturdy

Heavy W ash 23 .0 /4 9. 0 20 .0 /4 5.5 20/46.5 Not A pplicable

Normal Wash 17 .0 /4 3. 0 14 .0 /3 9.5 14.0 /4 0.5 No t A pplicable

Light/Quick Wash

Fin al Sp in (RPM /M i n )

Max Extract Cycles Cotton/ Sturdy

Heavy W ash 23 .0 /4 6. 0 20 .0 /4 1.5 2 0 .0 /4 2. 0 20 .0 /4 3 .0

Normal Wash 17 .0 /4 0. 0 14 .0 /3 5.5 1 4 .0 /3 6. 0 14 .0 /3 7. 0

Light/Quick Wash

Fin al Sp in (RPM /M i n )

11 .0 /3 7.0 8.0/33.5 7.0/34 .5 Not A pplicable

800/3.5 60 0/3.0 500/4.5 No t A pplicable

11 .0 /3 4.0 8.0/29.5 8 .0 /3 0.0 8 .0 /3 1.0

800/4.0 60 0/3.5 500/5.0 500/5.0

Easy Care/ Perm Press Delicates

Hand Washables

Notes:

1. The main wash times listed include 2 minutes of bleach fill and tumble time.

2. The total cycle times are approximate and will vary based on water fill times, due to types of clothing loads, available water pressure and the time for the door lock system to retract at the end of the cycle.

3. The main wash time is affected significantly if the machine control detects an excessive amount of suds. The washer will go into a suds reduction routine, consisting of a series of additional rinse and partial drain cycles to reduce the suds present (See Troubleshooting &

Diagnosis - Clothes Wet at End of Spin).

Tumble Pattern - Number of seconds tumbling/Number of seconds of pause between tumbles.

Cotton/ Sturdy Easy Care/

Perm Press

7/3 5/ 3 6/2 4 3/27

De licates Hand W ashab les

16008373-01 SECTION 1. GENERAL INFORMATION

1-13

GENERAL COMPONENT EXPLODED VIEW

16008373-01 SECTION 1. GENERAL INFORMATION 1-14

SECTION 2. ELECTRICAL COMPONENTS & TESTINGSECTION 2. ELECTRICAL COMPONENTS & TESTING

SECTION 2. ELECTRICAL COMPONENTS & TESTING

SECTION 2. ELECTRICAL COMPONENTS & TESTINGSECTION 2. ELECTRICAL COMPONENTS & TESTING

ELECTRICAL TEST EQUIPMENTELECTRICAL TEST EQUIPMENT

ELECTRICAL TEST EQUIPMENT

ELECTRICAL TEST EQUIPMENTELECTRICAL TEST EQUIPMENT

The equipment required to service Maytag products depends largely upon the conditions you encounter. Locating a malfunction will

DescriptionDescription

Description

DescriptionDescription

Analog Test Meter 200 00005

Digital Test Meter 20001001

Clamp-On Ammeter 20000002

AC Voltage Sensor 20000081

Analog Test MeterAnalog Test Meter

Analog Test Meter

Analog Test MeterAnalog Test Meter can be used to check for open or closed circuits, measure resistance, AC and DC volts, and temperature.

often require the use of electrical testing equipment such as:

Part NumberPart Number

Part Number

Part NumberPart Number

Clamp-On AmmeterClamp-On Ammeter

Clamp-On Ammeter

Clamp-On AmmeterClamp-On Ammeter can be used to detect shorts. Overloads on the circuit breaker or fuse can be traced to either the washer or circuit breaker by checking the washer current draw.

AC Voltage SensorAC Voltage Sensor

Digital Test MeterDigital Test Meter

Digital Test Meter

Digital Test MeterDigital Test Meter can be used to check for open or closed circuits, measure resistance, AC and DC volts, and temperature.

16008373-01 SECTION 2. ELECTRICAL COMPONENTS & TESTING

AC Voltage Sensor

AC Voltage SensorAC Voltage Sensor can be used to alert you if AC voltage is present so proper safety precautions can be observed. The tip of the sensor will glow bright red if voltage is between 110-600 volts AC.

2-12-1

2-1

2-12-1

ELECTRICAL TESTS

Water Valve Test

Warning - Always shut off electrical power to the unit 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.

Voltage Checks

Generally, these checks will consist of taking readings at the wall receptacle to determine the availability of voltage to the product. Voltage checks on individual components of a product are not recommended due to the possibility of electrical shock. Component part testing is best accomplished through continuity checks with an Appliance Test Meter

(See Electrical Test Equipment).

NOTE: Use of the meter on voltage higher than the indicated range may cause permanent damage to the meter. To prevent damage, first select the highest range and then lower the range for readings which fall within the lower scale.

Set up meter for use as follows:

1. Turn selector knob to desired meter function and appropriate range.

2. Plug black lead into socket marked black (-).

Check the water valve for electrical continuity. This check should be made with the elec-

trical supply disconnected from the washer.

Remove the wire harness from the water valve terminals and place the ohm meter probes on the terminals of the water valve. The water valve solenoid coil should have a resistance between 500-1000 ohms. If no ohms are shown on the display of the electrical test meter, the solenoid coil has an open winding and the valve should be replaced. The thermistor in the water valve changes in resistance in direct relationship to water temperatures. To monitor the performance of the thermistor, run a partial hot water fill and check the ohm resistance of the thermistor circuit. Then, run a cold water fill and measure the resistance again. There should be a notable difference in the resistance readings. To check the ohm resistance, pull the P2 wire harness connector off the machine control and locate the P2(5) and P2(6) leads in the connector (Figure 2-3).

Wax Motor Check - Door Lock Mechanism

Check the wax motor for proper resistance.

This check should be made with the electrical supply disconnected from the washer. Re-

move the wire harness from the wax motor terminals and place the ohm meter probes on the terminals of the wax motor. The wax motor should have a resistance of approximately 1900 ohms at room temperature. To check wax motors through console, see section:

Machine Control page 2-5.

3. Plug red lead into socket marked red (+).

4. Place test leads into receptacle to determine voltage available.

16008373-01 SECTION 2. ELECTRICAL COMPONENTS & TESTING

2-2

Timer & Console SwitchesTimer & Console Switches

Timer & Console Switches

Timer & Console SwitchesTimer & Console Switches

The timer is located in the control console on the back. It is composed of a series of switches driven by an electric timer motor. The timer motor rotates a pinion gear which then rotates internal cams. As the cams rotate, they lift and drop various switch contacts which ride on the cam. The internal switches provide cycle sequence or step inputs to the machine control to control the pump, dispenser wax motors, delay light, ON light and timer motor .

The timer wire harness connector can be pulled and the individual contacts for the various circuits can be checked with an ohm meter. As illustrated, timer contact for the drain pump is 14T

(Figure 2-1).(Figure 2-1).

(Figure 2-1).

(Figure 2-1).(Figure 2-1).

CC

C

TTTCC

TT

Figure 2-2Figure 2-2

Figure 2-2

Figure 2-2Figure 2-2

BB

B

BB

motor windings. The following chart can be used for checking other components via the timer wire harness connector.

Figure 2-1Figure 2-1

Figure 2-1

Figure 2-1Figure 2-1

Y ou can identify the wire for the drain circuit

(Figure 2-2)(Figure 2-2)

(Figure 2-2)

(Figure 2-2)(Figure 2-2)

by tracing down the side of the connector to contact 14, and across to align with column T.

Contact 8B in the connector is a direct contact to the neutral leg of the timer . When an ohm meter probe is placed into the 14T connection and the other probe is placed into 8B, an ohm reading of the complete drain circuit can be performed. The drain circuit should have a resistance of approximately 18 ohms. This is the resistance reading of the pump

Description Connector Connector Ohms

Pump Motor

Bleach Wax Motor

Softener Wax Motor

Timer Motor

Timer Input ChartsTimer Input Charts

Timer Input Charts

Timer Input ChartsTimer Input Charts

14T 10B 18

2B 10B 950-1100

2T 10B 950-1100

10T 10B 5000

As stated previously, the machine control board receives inputs from the timer monitor where the timer is in the cycle. The machine control board accomplishes this by routing four circuits through the timer. Two of the circuits (1A & 1B) are supplied with 120 V AC and the other two circuits (2A & 2B) are 24 VDC. The voltages for the four circuits is shown on the timer chart of the electrical schematic enclosed in the washer console.

16008373-01 SECTION 2. ELECTRICAL COMPONENTS & TESTING

2-32-3

2-3

2-32-3

Software in the machine control board specifically monitors the timer input circuits to determine where the timer is in all the wash cycles and will rapidly advance the timer to OPEN and break contacts in the timer. The timer is solely used as an off-board set of relay switches. Note: The timer motor is hard wired to timer cams 10T and 10B in the

timer.

TIMER 1A

(120 VAC)

CYCLE SEQUENCE

PREWASH TUMBLE 0 1 1 0 PREWASH DRAIN 1 1 1 0 MAIN WASH TUMBLE 0 1 0 0 LIGHT WASH TUMBLE 1 1 0 0 BLEACH DISPENSE 1 0 1 0 RINSE TUMBLE 1 0 0 1 SPIN 1 0 0 1 0 SPIN 2 0 0 0 1 SPIN 3 0 1 0 1 EXTRA RINSE 1 1 0 1 DELAY 1 0 0 0

PK19/P7(8)

TIMER 1B

(120 VAC) YL16/P7(7)

TIMER 2A

(24 VDC) PU17/P3(3)

TIMER 2B

(24 VDC) BU18/P3(5)

IDLE 0 0 0 0

Key: 0 = Input Signal Not Asserted 1= Input Signal Asserted

There are conditions under which the machine control will shut the cycle down if the timer does not advance.

- During Extra Wash/Prewash: If the timer inputs do not change away from Prewash Tumble for 15 minutes, the machine control will open the line relay.

- During Main Wash: If the timer inputs do not change for 29 minutes, the machine control will open the line relay.

- During any increment when the machine control energizes the timer motor until it sees the timer inputs change: If the timer inputs do not change for 5 minutes with the timer motor continuously energized, the machine control will open the line relay.

These varying delays are to allow the washer to progress through several increments where the timer inputs normally do not change. In these cases, the machine control energizes the timer motor for 30 seconds, which is its advance time. It does not look for a timer input change.

16008373-01 SECTION 2. ELECTRICAL COMPONENTS & TESTING

2-4

Machine ControlMachine Control

Machine Control

Machine ControlMachine Control

The machine control microprocessor board is located in the control console, mounted to the rear panel. The board receives input from the timer , door latch and lock switches, and unbalance and selector switches on the console. It also communicates with the motor control board to facilitate the various cycles and drive the motor for optimum perfor mance. Torque and speed of the motor are monitored through the motor control board.

Prior to Series 17Prior to Series 17

Prior to Series 17

Prior to Series 17Prior to Series 17

Figure 2-3Figure 2-3

Figure 2-3

Figure 2-3Figure 2-3

Series 17 and AfterSeries 17 and After

Series 17 and After

Series 17 and AfterSeries 17 and After

Figure 2-3bFigure 2-3b

Figure 2-3b

Figure 2-3bFigure 2-3b

Both incoming and exiting voltage are 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 any loose connections or open circuits by disconnecting the power supply and performing continuity checks of individual circuits.

Line Relay Connector Comm (Gray wire), L1 output is Line Relay Connector Comm (BlackLine Relay Connector Comm (Gray wire), L1 output is Line Relay Connector Comm (Black

Line Relay Connector Comm (Gray wire), L1 output is Line Relay Connector Comm (Black

Line Relay Connector Comm (Gray wire), L1 output is Line Relay Connector Comm (BlackLine Relay Connector Comm (Gray wire), L1 output is Line Relay Connector Comm (Black wire).wire).

wire).

wire).wire).

NOTE:NOTE:

NOTE:

NOTE:NOTE:

Connector P5 is Neutral input and L1 input is the Connector P5 is Neutral input and L1 input is the

Connector P5 is Neutral input and L1 input is the

Connector P5 is Neutral input and L1 input is the Connector P5 is Neutral input and L1 input is the

To check voltages from the board, turn timer dial to a wash cycle and press the start/off button. This will activate the L1 relay board and apply power on the machine control.

16008373-01 SECTION 2. ELECTRICAL COMPONENTS & TESTING

2-52-5

2-5

2-52-5

FUNCTION

MACHINE CONTROL BOARD TERMINAL/WIRE

VOLTAGEAPPROX. (When Activated)

TIMER CONTACT

Permanent Press

(Fabric Switch)

Delicates

(Fabric Switch)

Hand Wash

(Fabric Switch)

Cotton/Sturdy

(Fabric Switch)

Signal ON/OFF

(Options Switch)

Extra Rinse

(Options Switch)

Max Extract

(Options Switch)

Push To Start Switch

(When pressed)

Unbalance Control

P5 (WH11) P3/2 (PK 37) 24 VDC Not Involved

P5 (WH11) P3/6 (OR 38) 24 VDC Not Involved

P5 (WH11) P3/8 (BR 39) 24 VDC Not Involved

P5 (WH 11) P5 (WH 11) P5 (WH 11)

P5 (WH 11) P2/1 (PU 21) 24 VDC - ON

P5 (WH 11) P7/8 (PK 19) 120 VAC 12B, 6B,8T

P5 (WH 11) P2/3 (YL 20) 24 VDC Not Involved

P5 (WH 11) P1/3 (RD 28) 120 VAC Not Involved

P5 (WH11) P2/4 (OR 40) 24 VDC Not Involved

P3/2 (PK 37) P3/6 (OR 38) P3/8 (BR 39)

0 VDC 0 VDC 0 VDC

0 VDC - OFF

Not Involved

Door Lock - Spin P3 (1) P3/7 (YL 36) 24 VDC Not Involved Motor Control &

Machine Control Hot Water Valve P5 (WH11) P7/1 (OR7) 120 VAC or

Cold Water Valve P5 (WH11) P7/2 (BU 9) 120 VAC or

Door Lock Wax Motor

Bleach Wax Motor

Softener Wax Motor

Delay Light P5 (WH11) Not Involved 120 VAC 4T On Light

(Series 17)

P5 (WH11) LINE RELAY COM

(BK 27 or BK1)

P5 (WH11) P7/4 (BR 14) 120 VAC Not Involved

P5 (WH11) Not Involved 120 VAC 2T

P5 (WH11) Not Involved 120 VAC 2B

P5 (WH11) P7/5 (RD 3) 120 VAC Not Involved

120 VAC Not Involved

Not Involved

500-1000 Ohms

Not Involved

500-1000 Ohms

16008373-01 SECTION 2. ELECTRICAL COMPONENTS & TESTING

2-6

DRIVE MOTORDRIVE MOTOR

DRIVE MOTOR

DRIVE MOTORDRIVE MOTOR

The drive motor is a switched reluctance type motor. The basic operating principle of the switched reluctance motor is direct magnetic attraction between the stationary electromagnetic coils (stator) and a specially configured rotor or armature comprised of stacked plates or laminations mounted on a center shaft. The shape of these laminations are characteristic of the switched reluctance motor. The rotor, when viewed from the end of the rotor, has "teeth" much like a gear . These "teeth", or pole pieces, are pulled as the result of direct current power through the stator coils.

(Figure 2-4)(Figure 2-4)

(Figure 2-4)

(Figure 2-4)(Figure 2-4)

. The rotor is

The following illustration shows the motor terminals for each of the coils involved. The letters with positive and negative symbols indicate the motor phase circuitry of the terminals.

Motor Harness Connector

Figure 2-5Figure 2-5

Figure 2-5

Figure 2-5Figure 2-5

Figure 2-4Figure 2-4

Figure 2-4

Figure 2-4Figure 2-4

Multiple stator coils are positioned around the rotor and are connected in three different phased "sets" of paired coils.

Magnetic attraction causes the rotor poles to turn toward the coils. The electronic motor control board switches the magnetic field off as the rotor pole piece approaches; then, turns on another set of coils further ahead. It is this switching action of motor phases that determines direction and rotational speed of the rotor (and shaft). The motor control board changes the 120 V AC voltage line input to 170 VDC, and distributes the current phases to the stator coil sets in sequence to the drive motor.

Refer to section titled identification of A, B and C terminal/harnesses

(Figure 2-6). (Figure 2-6).

(Figure 2-6).

(Figure 2-6). (Figure 2-6).

for harness identification.

MOTOR CONTROL BOARDMOTOR CONTROL BOARD

MOTOR CONTROL BOARD

MOTOR CONTROL BOARDMOTOR CONTROL BOARD

The motor control board r eceives 120 VAC voltage from the line cord and distributes DC voltage to the drive motor. The motor control converts the voltage from single phase to 3 phase for the drive motor .

Another purpose of the motor control is to monitor the drive motor speed through a tachometer circuit linking the motor control board to a tachometer on the drive motor. This is a 3-wire circuit comprised of a Black, Blue and White wire harness. Failure of this circuit will cause the motor to start jerking in place or accelerate rapidly for up to 5 seconds. This occurs whenever the tachometer in the drive motor is trying to locate the proper shutter and sensor sequence. For example, if the tachometer signal is lost from the motor control to the machine control just prior to spin, the motor will ramp up for 5 seconds then stop.

Also, see the wiring schematic

Motor ControlMotor Control

Motor Control

Motor ControlMotor Control

for board

16008373-01 SECTION 2. ELECTRICAL COMPONENTS & TESTING

2-72-7

2-7

2-72-7

16008373-01 SECTION 2. ELECTRICAL COMPONENTS & TESTING

2-82-8

2-8

Motor & Motor ContrMotor & Motor Contr

Motor & Motor Contr

ol Tol T

ol T

estest

est

1. Set the timer knob into the delay increments.

2 . Press the push-to-start switch to start the

washer in the delay mode. Confirm the delay light is ON.

3. Check for 120 VAC between the L and N terminals (black wire no.27 and white wire no. 13) on the motor control board. If not present, check wiring between the machine control and the motor control boards.

4 . Unplug the washer power cord. Test cord

to the same board terminals.

5. Remove JP4 Interface connector wire harness on front end of motor control board.

6. Plug the washer power cord into a 120 V AC power source. The motor control will immediately execute a test routine and the motor should run, rotating the spinner at 50 rpm.

6.

If the motor runs,If the motor runs,

If the motor runs, and the spinner rotates

at the proper RPM speed, the problem lies outside of the motor and motor control circuit. Disconnect power to the washer and reconnect the JP4 Interface connector to the motor control.

7.

If the motor does not run:If the motor does not run:

If the motor does not run:

A. Check the 10-amp fuse located on the control board, either visually or with an ohm meter . If bad, completely replace motor control/wire harness assembly

(Figure 2-6).(Figure 2-6).

(Figure 2-6).

Figure 2-6Figure 2-6

Figure 2-6

B. If the fuse is functioning, visually check the six semiconductors on the heat sink for any damage. If damaged, replace motor control/wire harness assembly complete and check motor windings for damage

(See Drive Motor). (See Drive Motor).

(See Drive Motor).

Replace motor if

necessary

(Figure 2-6) (Figure 2-6)

(Figure 2-6)

..

.

C. If fuse and semiconductors show no visible damage, perform the motor phase test.

8. Unplug the washer power cord and replace motor control board connector JP4 when finished.

Motor Phase TMotor Phase T

Motor Phase T

estest

est

It is possible for the motor to still run under light loads when one of the phases of the motor is nonfunctional. One possible symptom would be a "growling" noise from the motor . Torque is decreased when the motor is out of phase. This could result in a customer complaint that the load is not spinning out properly or it does not tumble consistently with a large load

(See Section 3: T(See Section 3: T

(See Section 3: T

rr

r

ouble-ouble-

ouble-

shooting).shooting).

shooting).

To gain access to the motor control board terminals (Figure 2-6):

windings check (See Motor Windings

Check).

1. Disconnect power to the washer prior to

testing.

2. Remove the two screws securing the motor control assembly to the base. Unsnap the two twist-lock wire ties restraining the motor to the motor control board harness base.

3. Remove the green ground wire, line & neutral wires and the JP4 connector from the motor control board.

4. Carefully lift the front end of the motor control board to disengage the rear locking tabs from the slots in the base. Slowly drag the motor control board, with motor harness attached, toward the front of the washer and place in front of the washer.

5. Remove the screw securing the splash shield covering the face of the motor control board. Pivot the splash shield with top screw in the motor control board metal frame, allowing the plastic shield to become an electrical shield between the motor control board and the base.

6. Reconnect the ground wire, line 1 and neutral wires. Leave the JP4 connector off the board (Figure 2-6).

10. Check Phase B by disconnecting the white or red wire at the motor control board. If the motor operates with a slight growling sound, phases A and C are operating correctly. Reconnect phase B and test with phase A disconnected. If the motor does not run properly, phase A or C is not functioning. Perform the motor windings check (See Motor Windings Check).

Motor Windings Check

1. Disconnect power to the unit.

2. Remove each pair of phase wires from the motor control and perform an ohm check of each wire leading to the motor. Each wire pair should show 2-3 ohms resistance

(Figure 2-5).

2. There should be no continuity between any of the terminals and the frame of the motor.

3. Check that all six motor terminals are secure and at the same height in the connector housing. Replace motor if terminals are pressed into the motor.

7. Place the timer knob into the delay increments.

8. Plug the power cord into the wall socket and press the push-to-start button.

tor onto the motor. Reassemble the drip shield cover onto the motor control.

5. Reposition the motor control into the washer when finished. Make sure the two screws and the twistlock wire ties are fas-

4. Remount the six-position motor connec-

9. Check Phase C by disconnecting the yel-

tened properly to the wire harness.

low or orange wire at the motor control board. If the motor operates with a slight growling sound, phases A and B are operating correctly. Reconnect phase C and test with phase B disconnected. If the motor does not run properly, phase A or B is not functioning. Perform the motor

16008373-01 SECTION 2. ELECTRICAL COMPONENTS & TESTING

2-9

PHASE WIRE COLORS MOTOR CONDITION RESULT/SOLUTION

C Yellow or Orange Runs

Does Not Run

B White or Red Runs

Does Not Run

A Black or Blue Runs

Does Not Run

TT

achometer Cirachometer Cir

T

achometer Cir

TT

achometer Cirachometer Cir

The tachometer system of the motor is comprised of a plastic wheel, called a shutter , and an optical sensor mounted to the end of the motor shaft under the plastic endbell covering of the motor . The edge of the shutter resembles a "picket fence" with different size "pickets." The pattern consists of six different "pickets" which are repeated eight times. An optical sensor is mounted to one side of the shutter and monitors the "pickets" as they pass through the sensor .

cuit Diagnosticscuit Diagnostics

cuit Diagnostics

cuit Diagnosticscuit Diagnostics

(Figure 2-9).(Figure 2-9).

(Figure 2-9).

(Figure 2-9).(Figure 2-9).

The shutter is

-Phases A&B are operating correctly. (Check Phase A and B)

-Phase A or B is non-functional. (See Step 10)

-Phases A&C are operating correctly. (Check Phase A and C)

-Phase A or C is non-functional. (See Step 10)

-Phases B&C are operating correctly. (Check Phase B and C)

-Phase B or C is non-functional. (See Step 10)

Figure 2-9Figure 2-9

Figure 2-9

Figure 2-9Figure 2-9

As the "pickets" pass through the sensor field, signals are generated and transmitted to the motor control board through the tachometer wire harness

16008373-01 SECTION 2. ELECTRICAL COMPONENTS & TESTING

(Figure 2-10 and 2-11).(Figure 2-10 and 2-11).

(Figure 2-10 and 2-11).

(Figure 2-10 and 2-11).(Figure 2-10 and 2-11).

Figure 2-10Figure 2-10

Figure 2-10

Figure 2-10Figure 2-10

2-102-10

2-10

2-102-10