Neptune Dryer Service manual
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MDG9800
MDE9800
MDE6800
MDG6800
MDE7000
MDE7600
MDG7600
MDE8600
MDG8600
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3-2
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SECTION 9 - DRYER CONTROLS OVERVIEW ......................................................................... 9-1
DRYER CONTROLS OVERVIEW ............................................................................................ 9-1
BASIC CONTROL BOARD PHILOSOPHY FOR BOTH DRYERS ............................................ 9-1
BASIC MACHINE OPERATION ............................................................................................... 9-2
LED DRYER CONTROL SELECTIONS .................................................................................... 9-3
DRYER TEMPERATURE CONTROL ....................................................................................... 9-5
SPECIAL FEATURES ............................................................................................................... 9-6
SERVICE/DIAGNOSTIC MODE .............................................................................................. 9-6
LED DRYER ............................................................................................................................. 9-7
LCD DRYER ............................................................................................................................. 9-9
SYSTEM CHECK ................................................................................................................... 9-10
DIAGNOSTIC/HELP CODES ................................................................................................. 9-10
CONTROL CONFIGURATION MDE/MDG6800, MDG5500 ..................................................... 9-12
SERVICE MODE MDE/MDG6800, MDG5500 ......................................................................... 9-12
MEMBRANE PAD CHECK MDE/MDG6800, MDG5500 ........................................................... 9-12
SYSTEM CHECK MODE MDE/MDG6800, MDG5500 ............................................................. 9-12
DIAGNOSTIC CODES MDE/MDG6800, MDG5500 ................................................................. 9-13
MEMBRANE PAD CONTINUITY CHECKS MDE/MDG6800, MDG5500 ................................... 9-14
SERVICE MODE MDE/MDG7500, MDE/MDG9800 ................................................................ 9-15
USER INTERFACE MDE/MDG7500, MDE/MDG9800 ............................................................. 9-16
MEMBRANE PAD CHECK MDE/MDG7500, MDE/MDG9800 .................................................. 9-16
SYSTEM CHECK MDE/MDG7500, MDE/MDG9800 ................................................................ 9-16
DIAGNOSTIC/HELP CODES MDE/MDG7500, MDE/MDG9800 .............................................. 9-16
MEMBRANE PAD CONTINUITY CHECKS MDE/MDG7500, MDE/MDG9800 .......................... 9-17
SECTION 10 - ELECTRICAL SCHEMATICS ............................................................................ 10-1
MDE3000 ............................................................................................................................... 10-1
MDG3000............................................................................................................................... 10-2
MDE4000AZ, MDE8000AZ .................................................................................................... 10-3
MDE5000AZ .......................................................................................................................... 10-4
MDG7057............................................................................................................................... 10-5
MDG6000, MDG7000 ............................................................................................................ 10-6
MDE6000AZ, MDE7000AZ .................................................................................................... 10-7
MDE4000AY, MDE8000AY .................................................................................................... 10-8
MDE6000AU/AY, MDE7000AY .............................................................................................. 10-9
MDE7057AY ........................................................................................................................ 10-10
MDG4000AW/AX/BW, MDG8000AW/BW ......................................................................... 10-11
MDE5500 ............................................................................................................................. 10-12
MDE5500 (Canada) ............................................................................................................. 10-13
MDG5500............................................................................................................................. 10-14
MDE7500 ............................................................................................................................. 10-15
MDE7500 (Canada) ............................................................................................................. 10-16
MDG7500 ............................................................................................................................. 10-17
MDG6200 ............................................................................................................................. 10-18
MDE7600 ............................................................................................................................. 10-19
MDG7600 ............................................................................................................................. 10-20
MDE7600 (Canada) .............................................................................................................. 10-21
MDE8600 ............................................................................................................................. 10-22
MDE8600 (Canada) .............................................................................................................. 10-23
MDG8600 ............................................................................................................................. 10-24
MDE6200 ............................................................................................................................. 10-25
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Contents
©2000 Maytag Appliances Sales Company
v
MDE6200 (Canada) .............................................................................................................. 10-26
MDE6800 ............................................................................................................................. 10-27
MDG6800 ............................................................................................................................. 10-28
MDE9800 ............................................................................................................................. 10-29
MDG9800 ............................................................................................................................. 10-30
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Contents
©2000 Maytag Appliances Sales Company
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MDE/DG5500 Facia (LED Screen)
MDE/DG7500 Facia (LCD Screen)
PRODUCT SPECIFICATIONS
Same specifications as outlined in service
manual part number 16009968.
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Section 1. General Information
© 2000 Maytag Appliances Sales Company
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INPUT/OUTPUT VOLTAGES
LCD Dryer
Description
Connector
Pin Number
Connector
Pin Number
Voltage
Comments
Heater Relay - Internal
(Output)
P1
P2
24 VDC
L1 Board (Input)
BB1(1)
BB2(3)
120VAC
Door must be closed.
Motor (Input)
BB1(2)
BB2(3)
120VAC
Door must be closed.
24 VDC (Input)
BB1(3)
BB1(2)
24VDC
(Electric Dryer Only)
Neutral (Input)
BB2(2)
BB1(1)
120VAC
Heater Relay - External
BB2(1)
BB2(3)
120VAC
Door must be closed.
(Electric Dryer Only)
Door Sense
BB2(3)
BB1(2)
120VAC
Door must be closed.
24 VDC (Input)
BB2(4)
BB1(2)
24VDC
Thermistor
J4(1)
J4(2)
5VDC
Sensor Bar
J4(3)
J4(4)
24VDC
NTC
70o F=10K ohms
150o F=1754 ohms
LED Dryer
Description
16023110
16010279
(16009968-01)
Connector
Pin Number
Connector
Pin Number
Voltage
Comments
Heater Relay - Internal
(Output)
P1
BB1(1)
120VAC
L1 Board (Input)
BB1(1)
BB2(3)
120VAC
Door must be
closed.
Motor (Input)
BB1(2)
BB2(3)
120VAC
Door must be
closed.
Neutral (Input)
BB2(2)
BB1(1)
120VAC
L1 Board (Input)
BB2(1)
BB2(3)
120VAC
Door must be
closed.
Door Sense
BB2(3)
BB1(1)
120VAC
Door must be
closed.
Thermistor
J4(1)
J4(2)
5VDC
NTC
70o F=10K ohms
150oF=1754 ohms
Sensor Bar
J4(3)
J4(4)
24VDC
Section 2. Electrical Components & Testing
© 2000 Maytag Appliances Sales Company
2-7
Membrane Pad Checks
On the MDE/DG5500 dryer you can perform
the Membrane Pad Check with the control
console. (See Section 9: Accessing Service
Mode; Membrane Pad Check)
On both dryers, you can check the membrane pads, by pulling the J7 connector from
the machine control board and locating the
corresponding switch pin numbers in the
ribbon harness.
LCD Dryer
M embrane Pad Pin Number Pin Number
home
J7(3)
J7(5)
favorites
J7(4)
J7(5)
back
J7(3)
J7(6)
start/pause
J7(3)
J7(7)
off
J7(4)
J7(7)
help
J7(4)
J7(6)
LED Dryer
Membrane
Pad
Pin Number Pin Number
sensor dry
J7(12)
J7(13)
time dry
J7(11)
J7(13)
time (+ )
J7(10)
J7(13)
time (-)
J7(9)
J7(13)
Dry Temp (^ )
J7(11)
J7(14)
Dry Temp (v)
J7(10)
J7(14)
Dryness(< )
J712)
J7(14)
Dryness(> )
J7(9)
J7(14)
wrinkle release
J7(11)
J7(15)
press care
J7(9)
J7(15)
air fluff
J710)
J7(15)
start/pause
J7(11)
J716)
signal (-)
J7(12)
J7(15)
off
J7(9)
J7(16)
signal (+ )
J7(12)
J7(16)
16010279
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(16009968-01)
Section 2. Electrical Components & Testing
© 2000 Maytag Appliances Sales Company
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MODELS: MDE/DG5500, 7500
CONSOLE WITH MEMBRANE PAD
5. For reinstallation, reverse the
aforementioned steps.
Warning - Always shut off
electrical power to the
dryer before beginning any
The replacement console assembly consists of
the console, medallion and membrane pad.
CONSOLE REMOVAL
1. Disconnect power to the unit.
2. Remove the four screws securing the
console to the rear cover plate.
Figure 4-10
MICROPROCESSOR BOARD
REMOVAL
1. Disconnect power to the dryer.
2. Remove the console assembly.
3. Carefully remove the membrane pad
harness and other wires from the
microprocessor board.
Figure 4-8
3. Lay a drop cloth across the top cover of the
washer.
4. Grasp the top of the console and gently
rock the top of the console forward away
from the rear console back. Note the
hooked tabs on bottom of the console,
which engage the slots in the top cover.
Figure 4-11
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16010279
(16009968-01)
Figure 4-9
Section 4. Console Assembly
© 2000 Maytag Appliances Sales Company
4-3
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SPECIAL FEATURES
The LCD and LED dryers come with several
new features not available with the earlier
versions of the Neptune dryers. By pressing
a combination of keys, the dryer can be
placed into an Advertising Mode or into a
Service Mode for the service technician.
ADVERTISING MODE
This mode will continuously display the LEDs
on the keyboard or illuminate the touch
screen.
LED Dryer
Pressing the damp dry and sensor dry keys
for 5 seconds will start the washer in the
Advertising mode. No functions will be run
except illuminating the LEDs.
All the LEDs will light within 1.5 seconds in the
following order and repeat: start/pause, signal,
wrinkle prevent, wrinkle release, air fluff, damp
dry, less dry, normal dry, more dry, very dry,
cool down, wrinkle prevent indicator,
temperatures (regular, medium, low, extra low),
sensor dry, time dry, time(+), time(-), 7
segment display.
Enter and exit the advertising mode by using
the same 2 key sequence or unplug the
power cord.
LCD Dryer
This mode will continuously display the touch
screen on the keyboard.
Pressing the favorites and back keys for 5
seconds will start the dryer in the Advertising
mode. No functions will be run except
illumination of the touch screen panel.
While in advertising mode, the display will
cycle through eleven screens. If the touch
screen or any key (except off) is pressed, the
advertising sequence will be interrupted and
the control will go to the Interactive State.
When this occurs, the user is able to navigate
through the control as normal (including
setting favorites, setting preferences, etc.),
but the machine will not be allowed to run a
cycle. The only methods of exiting the
advertising mode is to remove power from
the machine or to press and hold both the
help key and the favorites key for 5 seconds.
The off key will not be active in the service
mode.
After 5 minutes of inactivity in the advertising
mode, the control will time out and return to
advertising mode and the advertising
sequence will begin again. When the control
times out in this manner, any settings or
changes that the user had made while in the
advertising mode will not be remembered.
SERVICE /DIAGNOSTIC MODE
This mode provides service personnel the
ability to verify the operation of the dryer.
The service mode can be implemented in the
middle of any dry cycle. While in the service
mode, the servicer can start special service
tests such as a system check mode,
membrane pad check, display software
revision number and display diagnostic/help
code listings. (See Service Mode Table) The
diagnostic/help code information displayed
provides information about the machine.
16023110
Section 9.
© 2000 Maytag Appliances Sales Company
Dryer Controls Overview
9-6
To aid the service technician, special software
was incorporated into the control boards of
the MDE/DG5500 & MDE/DG7500 dryers. The
software is used to monitor several functions
of the dryer during operation and identify any
abnormalities as they arise. These
abnormalities can be monitored in the
Service Mode and the board will list
previously identified failures as either a Help
or a Diagnostic code.
The Diagnostic codes are identified when the
severity level of the abnormality detected is
higher and service may be required.
Both code lists are stored in separate
permanent memories with a maximum of
nine codes per list.
NOTE: Due to the various differences
in the two dryer control systems, the
following pages will focus first on the
LED dryer then the LCD dryer.
LED DRYER
Accessing Service/Diagnostic Mode:
Pressing down the damp dry and time (-) keys
for 5 seconds places the machine in the
diagnostic mode.
Press Keys
Special Test/ Function
wrinkle
release
Diagnostic Codes
dryer
temp(^ )
Sequences up the
help/diagnostic code list
dryer temp(v)
Sequences down the
help/diagnostic code list
time (-)
Displays Software Revision
Number
very dry(< )
View current cycle
temperature (Co )
start/pause
Start or pause cycle running
but rem ain in Diagnostic
mode
Diagnostic Codes:
When a problem with the dry system is
detected a diagnostic code is assigned and
logged into the control board memory. An
assigned diagnostic code indicates the dryer
may need to be serviced. The control board
will not log mulitple same codes per cycle,
however, it will log as many diagnostics as
possible for the machine to continue running.
See the diagnostic code table for specific
actions or references to where the proper
action is defined. (See page 15)
Accessing Diagnostic Codes
After the machine is in the diagnostic mode,
a ‘d’ will display and let the technician know
they are in the diagnostic mode. Pressing the
wrinkle release key will access the diagnostic
codes.The diagnostic codes can be viewed by
using the temperature (^) & (v) keys.
SPECIAL TESTS
The following table lists the various tests
available while in the Service Mode, which
can be accessed by pressing the following
keys:
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Section 9.
© 2000 Maytag Appliances Sales Company
Dryer Controls Overview
9-7
The down arrow key will sequence down the
list one each time it is pushed with no wrap.
The first time the down arrow key is pushed
the display will sequence to the next code
logged. The last code being displayed being
the oldest code. The up arrow will sequence
up the list one code each time it is pushed
until it reaches the top code. If there are no
diagnostic codes available, ‘00‘ will be
displayed for the diagnostic code.
There will be no multiple occurrences of
either a diagnostic code or help code generated in the same cycle reported on the list.
But if the same code occurs in repeated
cycles, it will be registered.
This mode will allow the various inputs and
outputs to be controlled and viewed by the
technician by pressing individual keys. If no
activity is seen for 5 minutes after a key is
depressed, the control will reset back to the
normal mode. If no further activity is seen
after an additional 5 minutes the washer will
turn off. The following table lists the various
functions based upon on keys being depressed.
Key Pressed: Function Performed
sensor dry
Enable sensor dry circuit.
(sense dry LED) When short
circuit is detected across the
sensor bars the norm al dry
LED will turn on.
start/ pause
Cycles the motor relay
on/off. When the motor is
running the start/pause LED
is on.
To clear the diagnostic code list press
wrinkle prevent and very dry (>) for 5
seconds while viewing the list.
If motor is running, cycles
the heater/gas valve on/off.
dry temp(^ )
When the heater is regular
temp LED is on.
very dry(< )
System Check Mode
While in diagnostic mode, pressing the damp
dry and signal (+) keys for 2 seconds, will
put the dryer into the system check mode.
"SC" will display.
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View current cycle
temperature (Co )
Membrane Pad Check
While in system check mode, pressing the
damp dry and sensor dry keys for 5 seconds,
will start a membrane pad switch test.
The membrane check involves turning all the
embedded LED on the membrane pad on.
All the LED’s can be toggled off by pressing
the key associated with the LED. To exit the
test at any point, press the damp dry (>) &
sensor dry keys again for 5 seconds or press
the off key to exit diagnostic mode.
Section 9.
© 2000 Maytag Appliances Sales Company
Dryer Controls Overview
9-8
User Interface Test:
LCD DRYER
upper
left
Accessing Service Mode
Press and hold the back and help keys for 5
seconds to start the Service Mode.
User Interface
Test
upper
right
Touch the four corners and center of the touch
screen in any order.
center
lower
left
Pressing the Service Mode keys again, will
take the machine out of the Service Mode.
Service Mode
user interface test
diagnostic codes
1...
2...
3...
4...
system check
exit user
interface test
lower
right
This will check the touch screen. The service
technician is prompted to “Touch the four
corners and center of the touch screen in any
order." When each area is pressed, the
display will reverse image. If all areas are
sensed, the control will display “Touch screen
test passed." If any area(s) is not sensed
within 5 seconds, the technician will be
prompted to “Touch the area(s) not
highlighted." If the area can still not be
sensed within 5 seconds, the control will
display “Touch screen test failed." In either
case scenario, the screen will step to the next
screen to check the membrane switches.
exit service mode
User Interface
Test
The Service Mode screen lists four different
touch panels; user interface test (membrane
switch test), system check, diagnostic codes
and exit service mode. Pressing any of the
touch screens will activate a different screen
dedicated to that function.
Touch screen test passed.
Press the 6 members switches in any order.
home
favorites
back
help
start/pause
off
The diagnostic codes listed are the last four
codes assigned by the dryer.
exit user
interface test
After 5 minutes of inactivity in Service Mode,
the dryer will exit Service Mode and return to
the state just prior to Service Mode. If a
service test is being run, the control will
remain in Service Mode until 5 minutes of
inactivity has occurred at the end of this
cycle.
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This test checks the membrane switches on
the console pad.
The screen displays the status of the touch
screen test that was just performed. The
Section 9.
© 2000 Maytag Appliances Sales Company
Dryer Controls Overview
9-9
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DRYER CONTROLS MDE/MDG6800, MDG5500
Control Configuration
This Trouble Shooting guide illustrates how the software
works with the 13 and 15 key membrane switches. The
section on Accessing Diagnostic Codes includes
instruction for use with older control boards.
Key Press
Special
Test/Function
Start or pause
cycle running but
remain in
diagnostic mode.
Start/Pause
13 Key Membrane
System Check Mode
While in Service Mode, pressing the
Air Fluff and Signal (+) - 13 Key Membrane
or
Air Fluff and Signal (+) - 15 Key Membrane
keys for 3 seconds, will put the dryer into the System
Check mode and "SC" will display. The following table
lists the various functions based on the keys being
pressed.
15 Key Membrane
System Check Mode Table
Key Pressed:
Sensor Dry
Service Mode
This mode provides Service Personnel the ability to
verify the operation of the dryer.
The Service Mode can be implemented in the middle of
any dry cycle. While in the Service Mode, the
Technician can start special diagnostic tests such as a
System Check Mode, Membrane Pad Check, Display
Software version number and display diagnostic/help
code listings.
Enter Service Mode:
Press Air Fluff and Time (^) - 13 Key Membrane.
or
Air Fluff and Time (+) - 15 Key Membrane.
keys for 3 seconds, or until a beep is heard. The
machine will now be in Service Mode and “d” will be
displayed.
Exit Service Mode
Press the OFF key to exit Service Mode or repeat the
Air Fluff and Time (+) sequence.
Diagnostic Tests
The following table lists the various tests available while
in the Service Mode, which can be accessed by
pressing the following keys:
Key Press
Special
Test/Function
Display list of
Wrinkle release
diagnostic codes.
Then press
To sequence thru
Temperature (^) - 13 Key
the diagnostic
or
and help codes.
Dry Temp (^) - 15 Key
Time (v) - 13 Key
or
Time (-) - 15 Key
Sensor Dry Level (^) - 13
Key
or
Very Dry (<) - 15 Key
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Display revision
number
View current
cycle temperature
in Celsius
Start/Pause
Temperature (^) - 13 Key
or
Dry Temp (^) - 15 Key
Sensor Dry Level (^) - 13
Key
or
Very Dry (<) - 15 Key
Function
Performed
Enable sensor
dry circuit (sense
dry LED) when
short circuit is
detected across
the sensor bars
the normal dry
LED will turn on.
Cycles the motor
relay on/off.
When the motor
is running the
start/pause LED
is on.
If motor is
running, cycles
the heater/gas
valve on/off.
When the heater
is regular temp
LED is on.
View current
cycle temperature
in Celsius.
Membrane Pad Check
The membrane check turns all the embedded LED’s on.
All the LED’s can then be toggled off by pressing the
key associated with the LED.
While in System Check Mode, pressing the
Air Fluff and Sensor Dry - 13 Key
or
Air Fluff and Sensor Dry - 15 Key
keys for 2 seconds, will start a Membrane Pad Switch
Test. To exit the test at any point, press the same keys
again for 2 seconds or press the OFF key to exit
Service Mode.
Section 9.
© 2000 Maytag Appliances Sales Company
Dryer Controls Overview
9-12
MDE/MDG6800, MDG5500
Diagnostic Codes
The Diagnostic Codes are identified when the severity
level of the abnormality detected is higher and service
may be required.
Code
Description
Trigger
Action Taken
2
Thermistor Open
Sensed
The
thermistor
resistance is
very high
3
Door Circuit
Failure
4
Possible motor
transistor error
Invalid state
for more
than 256
milliseconds
If either
motor
transistor is
seen open or
shorted
during
startup
Check for:
- Low ambient
temperature in
room (Below
50oF/10oC).
- Outside vent
damper is stuck
open in
wintertime.
Loose or open wire
terminals
Check for:
- Loose or open wire
terminals in Door
Sense circuit.
Check for:
- Loose
connections in
motor circuit.
- Run System
Check Mode
and check the
motor relay
function.
- If relay
functions,
disregard the
diagnostic
code.
If relay does not
function, replace
machine control
board.
5
6
Not Used
Non Volatile
Memory
8
Stuck Key
When a problem with the dryer is detected a Diagnostic
Code is assigned, and can be displayed. The Control
Board will not log multiple same codes per cycle;
however, it will log as many Diagnostics as possible for
the machine to continue running.
Accessing Diagnostic Codes with 13 Key Membrane
Press Air Fluff and Time (^) to enter Service Mode.
Press the Wrinkle Release key to access the
Diagnostic Codes. Scroll through the Diagnostic Codes
by pressing the Temperature (^) key. The first time the
key is pressed the newest code will be displayed. Each
additional key press shows the next code. Once all the
codes have been displayed a “d” is displayed and the
process repeats. If there are no Diagnostic Codes
available, “00” will be displayed for the Diagnostic Code.
Accessing Diagnostic Codes with 15 Key Membrane
Press Air Fluff and Time (+) to enter Service Mode.
Press the Wrinkle Release key to access the
Diagnostic Codes. Scroll through the Diagnostic Codes
by pressing the Temperature (^). The first time the key
is pressed the newest code will be displayed. Each
additional key press shows the next code. Once all the
codes have been displayed a “d” is displayed and the
process repeats. If there are no Diagnostic Codes
available, “00” will be displayed for the Diagnostic Code.
There will be no multiple occurrences of either a
diagnostic code or help code generated in the same
cycle reported on the list. But if the same code occurs in
repeated cycles, it will be registered.
Clearing Diagnostic Codes
To clear the diagnostic code list press
Problem
Detected
with integrity
of
parameters
stored in
EEPROM
memory.
A key is
sensed to be
pressed
more than
75 seconds,
the key shall
be assumed
to be stuck.
Disregard
Run membrane pad
check and replace
console w/membrane
pad if necessary.
Air Fluff and Wrinkle Release - 13 Key
or
Air Fluff and Wrinkle Release - 15 Key
for 3 seconds while in diagnostic mode.
Diagnostic Codes
Code
Description
1
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Dryer Thermistor
Short Sensed
Trigger
Action Taken
The
thermistor
resistance is
very low,
with a
temperature
> 175
degrees.
Check for:
Clogged lint
screen.
Restricted
vent system.
Failed thermistor.
Section 9.
© 2000 Maytag Appliances Sales Company
Dryer Controls Overview
9-13
MDE/MDG6800, MDG5500
Membrane Pad Continuity Checks
Note: Unplug connector and touch probe of meter to the
appropriate pin numbers. Meter will show infinity on
open keys and continuity on closed keys.
Membrane
Pad
Pin Number
Pin Number
Sensor dry
Time dry
Time(^) 13 Key
Time(+) 15 Key
Time(v) 13 Key
Time(-) 15 Key
Temperature (^) 13 Key
Dry Temp(^) 15 Key
Dry Temp (v) 15 Key
Sensor Dry Level 13
Key
Very Dry (<) 15 Key
Damp Dry (>) 15 Key
Wrinkle Release
Wrinkle Prevent
Air Fluff
Start/Pause
Signal(v) 13 Key
Signal(-) 15 Key
Off
Signal(^) 13 Key
Signal(+) 15 Key
J7(12)
J7(11)
J7(10)
J7(13)
J7(13)
J7(13)
J7(9)
J7(13)
J7(11)
J7(14)
J7(10)
J7(12)
J7(14)
J7(14)
J7(19)
J7(11)
J7(9)
J7(10)
J7(11)
J7(12)
J7(14)
J7(15)
J7(15)
J7(15)
J7(16)
J7(15)
J7(9)
J7(12)
J7(16)
J7(16)
J7 Connector
P1
J3
BB1
BB2
J4
Ribbon
Harness
Pin No. 1
Description
Heater Relay Internal
Output
LI Board (input)
Motor
(input)
Neutral (input)
Door Sense
Thermistor
Sensor Bar
1602311016023110
Connector
Pin Num
P1
Connector
Pin Num
BB1(1)
Voltage
BB1(1)
BB1(2)
BB2(3)
BB2(3)
120VAC
120VAC
BB2(2)
BB2(3)
J4(1)
BB1(1)
BB1(1)
J4(2)
120VAC
120VAC
5VDC
J4(3)
J4(4)
24VDC
Comments
120VAC
Door must be closed.
Door must be closed
Door must be open
NTC
70 F = 10K ohms
150 F = 1754 ohms
Section 9.
© 2000 Maytag Appliances Sales Company
Dryer Controls Overview
9-14
MDE/MDG7500, MDE/MDG9800
Service Mode
This mode provides Service Personnel the ability to
verify the operation of the dryer.
The Service Mode can be implemented in the middle of
any dry cycle. While in the Service Mode, the
Technician can start special diagnostic tests such as a
System Check Mode, Membrane Pad Check, Display
Software version number and display diagnostic/help
code listings.
blue jeans
towels
return without
making changes
Removing A Favorite Cycle
If the consumer wants a favorite cycle removed, see
below:
sensor dry
time dry
Air fluf
(no heat)
more cycles
favorites
bl
Yes
No
Making changes
Enter Service Mode:
Press Help and Back Keys for 3 seconds or until a
beep is heard.
Exit Service Mode
Press the OFF key or Exit Service Mode on the display
exit Service Mode. After 5 minutes of inactivity in
Service Mode, the machine will exit Service Mode and
return to the state just prior to where the user first
entered Service Mode.
create a
favorite
1602311016023110
edit a
favorite
delete a
favorite
Section 9.
© 2000 Maytag Appliances Sales Company
Dryer Controls Overview
9-15
MDE/MDG7500, MDE/MDG9800
User Interface
Enter User Interface and follow the directions on screen.
This test will check the Membrane Pads and Touch
Screen. The Membrane Pad and Touch Screen Test
must be completed in approximately 10 seconds or a
failure will be shown on the display.
System Check Cycle Running
If the dryer is already running a cycle and the system
check is activated, then the screen will display the
status of all the outputs and inputs to the control board.
cancel cycle: This will stop the current cycle.
exit system check: This will exit the system check
screen and revert back to the previous screen shown on
the display panel.
To toggle outputs,
press PAUSE and select output below
Membrane Pad Test
After passing the Touch Screen Test a Membrane Test
will be performed.
This will check the Membrane Switch and display the
status of the Touch Screen Test that was just
performed. The user will be prompted to press the
following 5 membrane switches in any order” (i.e. home,
favorites, back, help and start/pause). The sixth key
(i.e. off) should not be pressed. Pressing the off key will
shut down the machine. If all keys are pressed,
“Membrane switch test passed” will be displayed. If any
key(s) are not pressed within 5 seconds, the user will be
prompted to “Touch the key(s) that are not highlighted”.
If key(s) again are not pressed within 5 seconds, the
display will show which key(s) failed.
Output Status
motor on
heat on
sensor circuit enabled
Input Status
damp dry sensed
normal dry sensed
short circuit sensed
door closed
drum temperature
ambient temperature
cancel cycle
exit system
check
Diagnostic/Help Codes
Displays all the diagnostic codes and how many cycles
ago the codes occurred.
Displays all the help codes and how many cycles ago
the codes occurred.
Displays the current software version.
Displays the cycle count.
System Check Cycle Not Running
System checks can be performed whether the dryer is
in a dry cycle or not. If the dryer is not in a dry cycle, the
display screen will allow the technician to toggle various
components On/Off. The screen will also display the
current status of the component inputs to the control
board.
Enter Service Mode by Pressing Help and Back Keys
for 3 seconds or until a beep is heard.
toggle motor
toggle heater (if
motor is running)
toggle sensor
circuit
1602311016023110
exit system
check
Section 9.
© 2000 Maytag Appliances Sales Company
Dryer Controls Overview
9-16
MDE/MDG7500, MDE/MDG9800
Code
cycle count
xxxx
8
Description
Stuck Key
Trigger
Action Taken
A key is
sensed to be
pressed
more than
75 seconds,
the key shall
be assumed
to be stuck.
Run membrane pad
check and replace
console w/membrane
pad if necessary.
Membrane Pad Continuity Checks
exit diagnostic/
help codes
Diagnostic Codes
Description
Code
1
Dryer Thermistor
Short Sensed
2
Thermistor Open
Sensed
3
Door Circuit
Failure
4
Possible motor
transistor error
5
6
Not Used
Non Volatile
Memory
1602311016023110
clear
help codes
Trigger
Action Taken
The
thermistor
resistance is
very low,
with a
temperature
> 175
degrees.
The
thermistor
resistance is
very high
Check for:
Clogged lint
screen.
Restricted
vent system.
Failed thermistor.
Invalid state
for more
than 256
milliseconds
If either
motor
transistor is
seen open or
shorted
during
startup
Problem
Detected
with integrity
of
parameters
stored in
EEPROM
memory.
Note: Unplug connector and touch probe of meter to the
appropriate pin numbers. Meter will show infinity on
open keys and continuity on closed keys.
Membrane
Pad
Pin Number
Pin Number
Home
Favorites
Back
Start/Pause
Off
Help
J7(3)
J7(4)
J7(3)
J7(4)
J7(3)
J7(4)
J7(5)
J7(5)
J7(6)
J7(7)
J7(7)
J7(6)
Check for:
- Low ambient
temperature in
room (Below
50oF/10oC).
- Outside vent
damper is stuck
open in
wintertime.
Loose or open wire
terminals
Check for:
- Loose or open wire
terminals in Door
Sense circuit.
Check for:
- Loose
connections in
motor circuit.
- Run System
Check Mode
and check the
motor relay
function.
- If relay
functions,
disregard the
diagnostic
code.
If relay does not
function, replace
machine control
board.
Disregard
Section 9.
© 2000 Maytag Appliances Sales Company
Dryer Controls Overview
9-17
MDE/MDG7500, MDE/MDG9800
Description
Heater Relay Internal
Output
LI Board (input)
Motor
(input)
Neutral (input)
Door Sense
Thermistor
Sensor Bar
1602311016023110
Connector
Pin Num
P1
Connector
Pin Num
BB1(1)
Voltage
BB1(1)
BB1(2)
BB2(3)
BB2(3)
120VAC
120VAC
BB2(2)
BB2(3)
J4(1)
BB1(1)
BB1(1)
J4(2)
120VAC
120VAC
5VDC
J4(3)
J4(4)
24VDC
Comments
120VAC
Door must be closed.
Door must be closed
Door must be open
NTC
70 F = 10K ohms
150 F = 1754 ohms
Section 9.
© 2000 Maytag Appliances Sales Company
Dryer Controls Overview
9-18
16023110
9-19
16023110
16023110
16023110
16023110
16023110
16023110
16023110
16023110
16023110
16023110
16023110
16023110
16023110
16023110
16023110
16023110
16023110
16023110
16023110
16023110
(Canada)
16023110
16023110
(Canada)
16023110
16023110
16023110
16023110
MDE6800
16023110
16010297
(16009968-02)
Section 10.
© 2000 Maytag Appliances Sales Company
Wiring Diagrams
10-27
MDG6800
16023110
16010297
(16009968-02)
Section 10.
© 2000 Maytag Appliances Sales Company
Wiring Diagrams
10-28
MDE9800
16023110
16010297
(16009968-02)
Section 10.
© 2000 Maytag Appliances Sales Company
Wiring Diagrams
10-29
MDG9800
16023110
16010297
(16009968-02)
Section 10.
© 2000 Maytag Appliances Sales Company
Wiring Diagrams
10-30
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