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Maytag mdb8600awb Service Manual Page 4

Maytag dishwasher service manual.
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Component Readings/Testing
!
WARNING
To avoid risk of electrical shock, personal injury, or death, disconnect power to dishwasher before servicing,
unless testing requires power.
Manual Function Test
Field Service Test
A Manual Function Test may be started by pressing the
Normal Wash
key
A Field Service Test may be started by pressing the
Heavy Wash
key 5 times
5 times followed by the
Start
key within 6 seconds.
followed by the
Start
key within 6 seconds. This test must be performed with
clean water to insure proper sensor performance.
The
Normal Wash
LED will
Flash
3 times indicating manual test mode is
active. Specific keypads will turn on or off a component as follows:
"88" will appear in the display (if available*) and the following sequence of
events will occur:
Heavy Wash
Wash Motor
Normal Wash
Drain Motor
SECONDS
FUNCTIONS / ACTIVE LOADS
Light Wash
Water Valve
106
Vent Wax Motor/Water Valve
Rinse Only
Soap Dispenser (cycle once)
5
Thermistor check/Turbidity Sensor check &
calibration - no loads active.
Rinse Aid (cycle twice)
120
Wash Motor/Vent Wax Motor/Dispenser Wax Motor
Sanitize
Vent
Heated Dry
Heating Element
180
Wash Motor/Heater/Vent Wax Motor
120
Drain Pump
4
Water Valve
When a component is activated by pressing a specific keypad, the LED above
the keypad will be
On
. The test will cancel 120 seconds after the last keypad is
pressed. The display (if available) will show '99' until the remaining timeout
period is less than 99 seconds. At this point it will countdown until the mode
Time frame for Thermistor/Turbidity Sensor check & calibration may vary
times out, is cancelled, or another key is pressed. To cancel test, press the
slightly.
Start / Cancel
keypad.
The Field Service Test will not repeat. The
Heavy Wash
LED will
Flash
during
the test mode. Indicator lights (except
Heavy Wash
and the Display) will
Sales Floor Demo Mode
illuminate per Sales Floor Demo Mode. If the dishwasher door is opened
Press
Extra Rinse
keypad 5 times within 6 seconds. The LEDs will illuminate
during the test, the test sequence will pause, and resume when the door is
in a progressive order until all are lit. All LED's will stay on for 1 second then all
closed. To the cancel test, press the
Start / Cancel
keypad.
go off simultaneously. The display (if available) will begin at '50' and sequence
down to '0' at a 1 second interval and repeat until this mode is terminated. This
The control has been designed to test the Sensor Memory and Motor. During
mode will repeat.
the Field Service Test, if a fault has been detected, the test will abort any time
To cancel, press the
Start / Cancel
keypad.
after the motor current has been checked and 2 or more LED's will begin to
Flash
. A
Memory / Software Check
will occur immediately after the test is
Diagnostic Tips
**
started. The
(See Note )
LED and one of the following:
To check control LEDs, enter
Sales Floor Demo Mode
. If control fails to
perform as described, replace control. To check control and components, enter
Turbidity Sensor
- failure -
Rinse Only
LED
Field Service Test
. If control fails to perform sequence as described, and a
Thermistor
- failure -
Heavy Wash
LED
fault is detected, determine failure as described in the
Field Service Test
. If a
Motor
- high current -
Normal Wash
LED
load component failure has been diagnosed, proceed to the
Manual Function
Motor
- low current -
Light Wash
LED
Test
. To check individual load components for proper operation, enter
Manual
Memory Failure Heated Dry
-
LED
Function Test
. Follow test procedure as described. Repair or replace
component as needed.
* On select models
** On units with Front Controls only, this will be the
Clean
LED on units with
,
Note
: The
High Current
or
Low Current Motor Error
may be detected during
Top & Front Controls, this will be the
Delay
LED
a wash cycle selected by a consumer. If this happens, the control will go into a
30 second auto restart mode and shut down if the unit is not able to restart the
motor.
Membrane Readings
Membrane Readings
(Front & Top Controls)
(Front Only Controls)
Connector
Measure Between
Connector
Measure Between
Heavy Wash
J1
Pin 9 -
Pin 5
Auto Clean
J1
Pin 10 - Pin 5
Normal Wash
J1
Pin 9 -
Pin 6
Heavy Wash
J1
Pin 9 -
Pin 5
Light Wash
J1
Pin 9 -
Pin 7
Normal Wash
J1
Pin 9 -
Pin 6
Rinse Only
J1
Pin 9 -
Pin 8
Light Wash
J1
Pin 9 -
Pin 7
Auto Clean
J1
Pin 10 - Pin 5
Rinse Only
J1
Pin 9 -
Pin 8
Start / Cancel
J1
Pin 10 - Pin 6
Quick Wash
J1
Pin 10 - Pin 6
Delay
J1
Pin 10 - Pin 7
Heated Dry
J1
Pin 11 - Pin 5
Heated Dry
J1
Pin 11 - Pin 5
Sanitize
J1
Pin 11 - Pin 6
Sanitize
J1
Pin 11 - Pin 6
Extra Rinse
J1
Pin 11 - Pin 8
Tough Scrub
J1
Pin 11 - Pin 7
Tough Scrub Plus
J1
Pin 10 - Pin 7
Tough Scrub Plus
J1
Pin 10 - Pin 8
160° Wash
J1
Pin 10 - Pin 8
Extra Rinse
J1
Pin 11 - Pin 8
Model ID Jumper
*
J1
Pin 12 - Pin 8
Model ID Jumper
*
J1
Pin 12 - Pin 7
Start / Cancel
J3
Pin 9 -
Pin 5
Delay
J3
Pin 9 -
Pin 6
An unpressed switch will read as an open circuit.
A pressed switch will read as 10 k ohms.
An unpressed switch will read as an open circuit.
* On select models
A pressed switch will read as 10 k ohms.
* On select models
Load Readings
Measure between:
Result
Heater¹
ST1 (Heater) - ST11 (Dlb Neutral)
16 ohms
Wash Motor
ST5 (Motor Common) - ST8 (Motor Main)
3 to 4 ohms
Drain Motor
ST6 (Drain) - ST4 (Dlb Line)
25 ohms
Vent Wax Motor
J6 Pin 1 (Vent) - ST4 (Dlb Line)
1.2 k ohms
Dispenser Wax Motor
J6 Pin 3 (Disp) - ST4 (Dlb Line)
2 k ohms
Water Valve²
J6 Pin 4 (Inlt) - ST4 (Dlb Line)
1.1 k ohms
Thermistor
J5 Pin 1 (Temp) - J5 Pin 4 (Neutral)
See Component Info
Notes:
1. This value assumes the high limit thermostat is closed.
2. This value assumes the float switch is closed.
3. Results are approximate values.
16023220
4
May 2004
©2004 Maytag Services

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