Neptune

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Neptune
LCD Display MAH7500
LED Display MAH5500B And 6500A
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 74
903713ZY  
SEE NOTE
Series



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Model/Serial Number Tag
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Installation Notes

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• 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 its top spin speed.

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Installation Clearances
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Unpacking
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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
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Cut Top Strap
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Cutting Lower Straps
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Warning!
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.
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Drain Hose Installation
Important installation notes attached to drain
hose
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Door Reversal
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Changing Hinges
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Hanging Door
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Component Location
Electronic Control 5500B-6500A-LED 7500A-LCD
Component Location Neptune 5500B-6500A-7500A
Heater 6500A 7500A
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Removing Console
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Removing Door
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Removing Hinge Covers
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Removing Inner Door Panel
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Vent Tube and Balance Assembly
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Check Valve
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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
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Component Identification
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Wiring Harnesses
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Removing Motor Controller
To remove motor controller remove two 5/16
screws
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Remove Housing
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Pressure Switch
Bag removed
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Removing Switch
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Heating Element
Thermistor terminals
Heater terminals
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Removing Heater
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Remove Heater
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View of gasket
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Dispenser
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Dispenser
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Door Release Cord
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Release Top
Remove Two Screws to Pop Top
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Components under top
Fill Valves
Balance Weight
Dispenser Valves
Inertial Unbalance Switch
Recirculating Hose
Boot Cable
Door Lock Assembly
Side Displacement Switch
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Inlet Hose
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Inlet water valves
Thermistor - Resistance decreases with
temperature rise
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Caution on rear panel
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Pump and Strut
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Motor and Strut
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Removing Motor
1. Roll off Drive Belt
2. Remove Bolt
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Allow the mounting pin to drop out of the motor
isolator as you pull the motor out from the front
of the machine
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Door Lock Assembly
Door catch
Light bulb
Actuator Button
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Removing door lock
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Removing Front Shroud
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Remove screws holding metal support bracket and
remove bracket
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Boot and Cable
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Removing Cable
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Unhooking Spring
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Spring Unhooked
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Removing Baffles
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Removing nut
Torque nuts to 18ft lbs.
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Removing Spinner Assembly
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Spinner Support
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Plastic Washer
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Removing Support
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New seal kit contains a seal insertion tool.
Use tool to press seal into into housing.
Part of tool only is 22004082
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Display window
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Option Pads
MAH6500A
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Start Pause Pad
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Temperature Selector
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Troubleshooting

• The 10 most common Neptune Consumer complaints
• 1. Wont fill
• Leaking
• Wet clothes
• Noisy
• Wrong water temperature
• Wont start
• Over sudsing- Tub full of suds
• Wont tumble
• Wont unlock
• Will not lock

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Electronic Controls

• 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.
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Electronic Control Inputs and Outputs
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Technical Data Sheet
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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.

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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
• Ø      service cycle
• Ø      user interface check
• Ø      quick spin
• Ø      control system diagnostic mode
• Diagnostic codes and additional help codes can be
  accessed and the information will be displayed in
  the control window.
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• 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

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Special Tests Chart
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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
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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.
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Board Output Test

• At times it is to the technicians 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.

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Output Test Chart
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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.

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Input Test
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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.

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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.
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Quick Spin Test
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Membrane Pad Check

• The membrane check involves turning all the
  embedded LEDs on the membrane off except for the
  wrinkle free keypad. All the LEDs 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

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Troubleshooting

• Referencing Ground vs. Neutral
• Control Board Input and Output Chart

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Schematic
6500A
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Troubleshooting Diagnostic Codes

• Low Voltage Reference Points
• Diagnostic Codes

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Circuit Board
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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 gt 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.

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Troubleshooting Motor Drive System

• Machine Control Output Test
• Motor and Motor Control Test
• Jumper Cord Test

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JP4 disconnected
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• ANY QUESTIONS?