Neptune LED Display MAH5500B And 6500A LCD Display MAH7500 Both the LED and LCD models incorporate the same mechanical systems; the major difference between the two models is the electronic control board and display. The LCD version features an interactive liquid crystal display window. Series Numbers: The first 2 characters in a Maytag serial number are used to identify design changes. When ordering parts, the series designation is necessary to ensure the correct part is selected. Example: Serial Number ZY SEE NOTE: Series Neptune

Neptune Model/Serial Number Tag

Neptune Installation Notes Floor stability and proper leveling are extremely important for any Neptune installation, if the floor is not sturdy enough to support the washer properly, or the machine is not properly leveled, the vibration detection system will not allow the machine to reach it’s top spin speed.

Neptune Installation Clearances

Neptune Unpacking Cut two shipping straps Remove straps and cardboard

Neptune Use large flat blade screwdriver to remove two shipping staples. One end of the staple is embedded in the crate and the other end hooks into the washer

Neptune Cut Top Strap The top strap is a one piece strap, cut either side of the buckle and pull the strap completely out

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9 Cutting Lower Straps The lower strap is actually two separate straps. The straps loop around the tub on the left and right sides of the machine. Make sure to cut both sides of buckle and separate straps when you pull them out.

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Neptune Failure to remove the shipping straps completely can result in the straps becoming entangled in the motor and pulley assembly. This can result in odor complaints or failure of the spinner to rotate at designed speed.

Neptune Drain Hose Installation Important installation notes attached to drain hose

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Neptune Door Reversal Remove Two Hinge Screws And Remove Door Remove Two Hinge Covers Hinge Screws

Neptune Changing Hinges Install hinge covers on opposite side Install hinges on opposite side of door Remove screws securing hinges Remove four painted screws covering hinge holes on door

Neptune Hanging Door Check operation of door Install painted screws in opposite hinge holes Install hinge screws Install door

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Neptune Component Location Electronic Control 5500B-6500A-LED 7500A-LCD Component Location Neptune 5500B-6500A-7500A Heater 6500A & 7500A

Neptune Removing Console To remove console, remove two ¼” screws, one on each side of cabinet

Neptune With the two lower screws removed, tilt the console forward and remove four screws holding the metal cover to the console

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Neptune Removing Door Remove the two hinge screws and remove door

Neptune Removing Hinge Covers

Neptune Removing Inner Door Panel To remove inner door panel, remove screws on three sides of door Screws

Neptune Vent Tube and Balance Assembly Vent tube Balance assembly Outlet Inlet

Neptune Check Valve Check valve assembly

Neptune Removing Front Panel Grasp the right and left sides of front panel. Rotate the posts away from the door opening and pull out Lift the front panel off the bottom clips and remove

Neptune Component Identification Unbalance Switch Motor Controller Drain Pump Boot Drain Heater Motor

Neptune Wiring Harnesses Remove the three wiring harnesses

Neptune Removing Motor Controller To remove motor controller: remove two 5/16” screws

Neptune Remove Housing Lift motor controller housing assembly and remove

Neptune Pump motor Drain pump Pressure Switch

Neptune Pressure Switch Pressure switch is mounted on top of drain pump. It’s covered with a plastic bag. Bag removed

Neptune Removing Switch Removing out of balance switch

Neptune Heating Element Thermistor terminals Heater terminals

Neptune Removing Heater To remove heater: Remove heater and thermistor wires Loosen 10mm nut

Neptune Remove Heater

Neptune View of gasket Nut Tightening the 10mm nut causes lower plate to compress the rubber gasket and seal against the tub housing

Neptune Siphon tubes Bleach reservoir Fabric softener Dispenser outlet to tub Dispenser

Neptune Dispenser Dispenser cover must be removed to raise top Remove four Phillips head screws

Neptune Door Release Cord Removing siphon reservoir allows easier access to release cord To release door lock–pull line to left while pulling on the door

Neptune Release Top Remove Two Screws to Pop Top

Neptune Components under top Balance Weight Boot Cable Inertial Unbalance Switch Dispenser Valves Fill Valves Door Lock Assembly Recirculating Hose Side Displacement Switch

Neptune Inlet Hose Water inlet hose from dispenser assembly to tub

Neptune Thermistor - Resistance decreases with temperature rise Inlet water valves

Neptune Caution on rear panel Remove four screws to remove rear access panel

Neptune Pump and Strut View from rear with access panel removed Pressure Switch, drain pump and motor Suspension strut Sump Drain

Neptune Motor and Strut View from rear with access panel removed Drive motor Suspension strut Ribbed motor pulley Drive belt Tub drive pulley

Neptune Removing Motor 2. Remove Bolt 1. Roll off Drive Belt

Neptune Allow the mounting pin to drop out of the motor isolator as you pull the motor out from the front of the machine

Neptune Be careful not to damage the rear housing of the motor when servicing New motor and controller introduced on the 6500A – incorporated in the 5500B and 7500A model lines series 88 and newer

Neptune Motor and controller used on 5500B and 7500A prior to series 88

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Neptune Door Lock Assembly Door catch Actuator Button Light bulb

Neptune Removing door lock Remove two 5/16” screws and remove door lock assembly

Neptune Removing Front Shroud After removing door lock assembly the front shroud can be removed

Neptune Remove screws holding metal support bracket and remove bracket

Neptune Boot and Cable Removing or replacing boot cable

Neptune Removing Cable Grasp cable end with needle nose and spring hook with suspension spring tool

Neptune Unhooking Spring

Neptune Spring Unhooked Expand spring to to hook or unhook

Neptune Removing Baffles Remove two T-20 Torx screws Removing baffles

Neptune Removing nut Three ½” nuts secure the tub to the spinner support Torque nuts to 18ft lbs.

Neptune Remove three ½” nuts, profile washers and spinner supports

Neptune Removing Spinner Assembly

Neptune Spinner Support A plastic washer is installed between the spinner support and the tub

Neptune Plastic Washer TubSpinner support Plastic washer

Neptune Remove pulley Torque to ft. lbs.when reassembling

Neptune Removing Support With the spinner drive pulley removed, remove the spinner support

Neptune Journal area “O” Ring Spinner support shaft Replace the “o” ring and lubricate journals when servicing Use PN# Molykote

Neptune View of seal with spinner support removed Remove sleeve Remove sealView of bearing with seal removed

Neptune New seal kit contains a seal insertion tool. Use tool to press seal into into housing. Part # of tool only is

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Neptune Bead on tub cover Lip on gasket Bead lip

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Neptune Start at 6 o’clock position and work both sides to top

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Neptune Display window Display Window Cycle Pads

Neptune Option Pads MAH6500A

Neptune Start Pause Pad Start/Pause Pad Initially depressing the start pad starts the unit, depressing the pad a second time will pause the operation

Neptune Temperature Selector Water Temperature Selector Up Arrow Down Arrow

Neptune Fabric Selection Pads Fabric Selector-matches the proper wash action for each fabric type

Neptune Troubleshooting The 10 most common Neptune Consumer complaints: 1. Won’t fill 2.Leaking 3.Wet clothes 4.Noisy 5.Wrong water temperature 6.Won’t start 7.Over sudsing- Tub full of suds 8.Won’t tumble 9.Won’t unlock 10. Will not lock

Neptune LED Control LCD Control LCD Washer Control Board LED Washer Control Board  Software revisions have been made – you might notice slight differences between old and new product. Always supply the correct serial number when ordering replacement parts  Located in the control console.  Location of the Pin connectors is different between the LED and LCD models Note: The electronic control board is the most often misdiagnosed component on the Neptune product. Returns indicate that less than 20% of the boards are defective. Electronic Controls

Neptune Electronic Control Inputs and Outputs Inputs To Control Board Outputs to Load Components Door Lock Solenoid Door Unlock Solenoid Electronic Control Board Door Latch Switch Door Lock Switch Touch PadsUnbalance Switches Water ValvesPumpHeater 6500A and 7500A Motor Sensor Resistance 6500A &7500A Pressure Switch Tub Light Motor Controller

Neptune Technical Data Sheet Technical data sheet located in console

Neptune Consumer Help Codes LED Models The electronic control may automatically display codes to help the consumer better understand what is occurring with the washer. The following information is located in the User Guide. The meaning of the code is explained as well as the recommended solution.

Neptune Service Mode  The service mode provides service personnel the ability to verify the operation of the washing machine. The service mode can be initiated in the middle of any wash cycle.  While in the service mode the technician can implement special service tests such as:  * service cycle  * user interface check  * quick spin  * control system diagnostic mode  Diagnostic codes and additional help codes can be accessed and the information will be displayed in the control window.  Accessing the Service Mode: (LED DISPLAY, 5500B or 6500A)  Depressing the delicates and heavy soil keys for 3 seconds places the machine in the service mode.  The display on the will indicate “00”

Neptune Special Tests Chart

Neptune Diagnostic Codes When a problem with the wash system is detected a diagnostic code is assigned and logged into the control board memory with the last cycle count at which it occurred. The initiation of a diagnostic code indicates the washer needs to be serviced. The control board will allow as many diagnostics as possible for the machine to continue running. In some cases, when the washer shuts down, a code will be displayed in the control window until the consumer selects the off key. See the diagnostic code table for specific actions or references. Accessing Diagnostic Codes After the electronic control board is in the service mode, pressing the presoak key will display a “d” in the window and illuminate the LED above the presoak key

Neptune Service Help Codes When the washer operates differently than designed, a help code is initiated and stored in the control memory. Unlike customer help codes, which are displayed automatically, these codes can only be accessed in the service mode. The severity of the irregularity indicated by a help code is generally less than that of a diagnostic code. Help codes can be useful in diagnosing mechanical failures as well as improper machine use and intermittent operation. Accessing Service Help Codes Place the washer in the service mode and then press the stain cycle key. “h” will be displayed in the window and the LED above the stain cycle key will illuminate.

Neptune Board Output Test At times it is to the technician’s advantage if they can energize certain components as they see fit instead of when the machine wants to. The Board Output Test can be used to activate any of (the different components in the machine. This can greatly accelerate the testing procedure. If component does not turn on,suspect poor wiring connections or failed component. This test will turn on a specified output with a press of a key. All outputs will be turned off after 10 minutes, unless another output is selected. Accessing Board Output Test While in the service mode, press the rinse key.

Neptune Output Test Chart KEYFunction Performed Cotton SturdyEnergizes Hot Water valve Wrinkle FreeEnergizes Cold Water Valve DelicatesEnergizes Bleach Valve Hand WashEnergizes Fabric Softener Valve PresoakEnergizes Drain Pump Stain Cycle Energizes Motor Control 120 VAC supplied to motor controller, motor does not run. Extra RinseUnlock Door ( pulse every 2 seconds) Max Extract Lock Door ( pulse every 2 seconds) (Lock Light Illuminates)

Neptune Board Input Test A common method of checking switches and controls is to make a resistance measurement of the circuit. Neptune control boards have the ability to report back the state of switches and other inputs to the board. Use of the Board Input test enables a technician to diagnose certain failures in a very short period of time. When in the service mode. Press the hand wash keypad.The Board input test allows the service technician to check the logic information supplied to the control board.

Neptune Input Test

Neptune Quick Service Cycle Pressing the Delicates key will start a quick service cycle. Enter the service mode Press the Delicates keypad The following sequence of events will occur automatically when connected to water: 1. Energize the cold water and bleach valves. Fill to low level, and then turn cold and bleach valves off. 2. Energize the hot water and fabric softener valves. Fill to high level, then turn all valves off. 3. Lock the door if not locked. 4. Tumble 5. Turn the drain pump on. 6. Spin to 800 rpm using default rate 7. End Spin and coast down 8. Unlock the door when the RPM is zero. 9. Display ‘PA’ continuously for 10 seconds.

Neptune Quick Spin Test While in the service mode, pressing the spin key will start the washer in the quick spin mode. The following are the Quick Spin test steps 1. Door Locks 2. Spin to 350 rpm and holds for 6 seconds 3. Spin to 550 rpm and hold for 6 seconds 4. Spin to 600 rpm and hold for 6 seconds 5. Spin to 650 rpm and hold for 6 seconds 6. Spin to 800 rpm and hold for 6 seconds 7. Spin to 1000 rpm and hold for 6 seconds Pressing the Spin key again during the Quick Spin Test will cause the current speed to be held indefinitely. Pressing the Spin key again will revert back to original sequence.

Neptune Quick Spin Test Speed rangeDisplayed as 0-99 rpm rpm 2 digit speed X 10 Speed in excess of 1000 rpm Letter and digit A = >1000 but <1100 B = >1100 but <1200 C = >1200 but < nd digit = tens Examples: A2 = 1020 rpm B6 = 1160 rpm

Neptune Membrane Pad Check The membrane check involves turning all the embedded LED’s on the membrane off except for the wrinkle free keypad. All the LED’s can be toggled by pressing the key associated with the LED. At any point, if there are 5 seconds of inactivity, the test will stop without any display Accessing the Membrane Pad Check Enter the service mode. Press the Wrinkle free keypad While in the service mode, pressing the Wrinkle Free key will start a membrane pad switch check

Neptune Troubleshooting Referencing Ground vs. Neutral Control Board Input and Output Chart

Neptune Schematic 6500A

Neptune Troubleshooting Diagnostic Codes Low Voltage Reference Points Diagnostic Codes

Neptune Circuit Board

Neptune Troubleshooting Door Lock Circuit The door lock can be verified by putting the washer into the service mode and manually locking and unlocking the door mechanism through the control panel. Note: The relay on the control board for the for the door lock mechanism is disabled if the motor control board indicates the spinner speed is > 7 rpm. 1. Place the washer in the service model 2. Advance to the Board output test and press Max Extract to lock the door and Extra Rinse to unlock the door.

Neptune Troubleshooting Motor Drive System Machine Control Output Test Motor and Motor Control Test Jumper Cord Test

Neptune JP4 disconnected Remove JP4 connector and follow instructions on technical data sheet for motor and controller test JP4 connector

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