Dishwasher — Technical Information
ADB3500AW*, MDBM755AW*, MDB7751AW*, MDB8751AW*,
MDB8951AW*
•
Due to possibility of personal injury or property damage, always contact an authorized technician for servicing or
repair of this unit.
•
Refer to Service Manual 16021814 for detailed installation, operating, testing, troubleshooting, and disassembly
instructions
CAUTION
All safety information must be followed as provided in Service Manual 16021814.
!
WARNING
To avoid risk of electrical shock, personal injury, or death, disconnect power to dishwasher before servicing.
!
Benefits
ADB3500AW*
MDBM755AW* MDB8751AW* MDB8951AW*
MDB7751AW*
Wash cycles
Heavy Wash
Normal Wash
Quick Wash
Light Wash
Insta Wash
Auto Clean
Rinse Only
5
X
X
X
4
X
X
6
X
X
5
X
X
X
X
X
X
X
X
X
X
X
X
X
Features
Sound package
QuietSeries™
200
QuietSeries™
300
QuietSeries™
400
Sofsound III™
High Temp
Wash
Electronic
Controls
X
X
X
X
X
X
X
X
Sanitizer
Sensor clean
X
X
X
X
X
X
X
100% Filtered wash Micro-Fine Plus Micro-Fine Plus Micro-Fine Plus
Water Filtration
Delay Start
water
2,4 or 6 Hour Delay
Filtration
2,4 or 6 Hour
Delay Start
X
Filtration
1-9 Hour Delay 1-9 Hour Delay
Filtration
Start
X
Start
X
Start
X
Energy Star
Hard Food
Disposer
Child lockout
Touch Pad
Controls
X
X
X
X
7
X
X
X
X
10
12
13
Silverware
Location
Low rinse aid
indicator
Wash
Compartment
Wash
Compartment
Wash
Compartment
In door
X
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Component Specifications
WARNING
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!
Illustration
Component
Test Procedure
Results
Dispenser wax motor
Measure resistance from J6 Pin 3
Tan (Dispenser) to ST4 Black
(Common) .........................................
120V with 1/4"
2 k Ω
actuation stroke
within 90 seconds
Limit Thermostat
Close on Temperature drop @ 149°F
± 7°F (Temp) .......................................
Open on Temperature drop @ 164°F
± 4°F (Temp) .......................................
0 Ω
= Closed
Infinite Ω = Open
Sensor/Thermistor
10KΩ ± 3% at 77°F and 2.4 k Ω ±
6.5% at 140°F
J5 pin 1 - Orange (Temp) to J5 Pin 4 -
Red (Neutral) ....................................... Infinite Ω = Open
0 Ω
= Closed
Heater/Heating
Element
Measure resistance from ST1
Red/Black (Heater) to ST11 White
(Common) ...........................................
16 Ω
120v/60hz, 650 watts
± 5% in air, 830 watts
± 5% in 90°F water
(This value assumes the high limit
thermostat is closed).
Drain Motor
Measure resistance from
ST6 Gray (Drain) to ST4 Black
(Common) ...........................................
120v/60hz
45 watts
25 Ω
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Component Readings/Testing
WARNING
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!
Manual Function Test
A Manual Function Test may be started by pressing the Heated Dry key
5 times followed by the Start key within 8 seconds.
Field Service Test
A Field Service Test may be started by pressing the Heated Dry key 6 times
followed by the Start key within 8 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:
KEY
Hi Temp Wash
Delay
Function
Wash Motor
Water Inlet Valve
Heating Element
LED
Hi Temp Wash
Delay
SECONDS
FUNCTIONS / ACTIVE LOADS
Vent Wax Motor / Water Valve
Thermistor check / Turbidity Sensor check &
calibration - no loads active.
Wash Motor / Vent Wax Motor / Dispenser
Wax Motor
106
5
Heated Dry
Heated Dry
Cycles Select / Normal
First Press
Second Press
Third Press
No Action
Dispenser
Drain Pump
Heavy Wash
Normal Wash
Light Wash / China Crystal
120
180
120
4
Wash Motor / Heater / Vent Wax Motor
Drain Pump
Water Valve
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 times out, is cancelled,
or another key is pressed. To cancel test, press the Start / Cancel keypad.
The time for the Thermistor check / Turbidy Sensor check & calibration may
vary slightly.
The Field Service Test will not repeat. The Heavy Wash LED will Flash during
the test mode. All Indicator lights (except Heavy Wash) will illuminate. If the
dishwasher door is opened during the test, the test sequence will pause, and
resume when the door is closed. To cancel the test, press the Start / Cancel
keypad.
Diagnostic Tips
To check control LED’s and components, enter Field Service Test. If control
,
fails to perform sequence as described, and a fault is detected, determine
failure as described in the Field Service Test. If a load component failure has
been diagnosed, proceed to the Manual Function Test. To check individual
load components for proper operation, enter Manual Function Test. Follow
test procedure as described. Repair or replace component as needed.
The control has been designed to test the Sensor Memory, and Motor. During
,
the Field Service Test, if a fault has been detected, the test will abort any time
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
started. The (Delay / Delay 2 hr) LED and one of the following:
Note: The High Current or Low Current Motor Error may be detected during
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.
Turbidity Sensor - failure - Hi Temp Wash LED
Thermistor - failure - Heavy Wash LED
Motor - high current - Normal Wash LED
Motor - low current - Light Wash LED
Memory Failure Heated Dry LED
-
Membrane Readings
(All Models)
* On select models
Connector
Measure Between
Pin 9 - Pin 5
Pin 9 - Pin 6
Heavy Wash
Normal Wash
Light Wash / China Crystal / Gentle Wash
Quick
Rinse Only
*
*
J1
J1
Membrane Readings
(Front & Top Controls)
/
*
J1
J1
J1
J1
J1
J1
Pin 9 - Pin 7
Pin 9 - Pin 8
Pin 10 - Pin 5
Pin 11 - Pin 5
Pin 11 - Pin 6
Pin 11 - Pin 8
Measure Between
Pin 10 - Pin 6
Pin 10 - Pin 7
Pin 10 - Pin 8
Pin 11 - Pin 7
Pin 12 - Pin 8
Pin 9 - Pin 5
Connector
*
Insta Wash
Tough Scrub Plus / Super Scrub / Power Scrub
160° Wash
Tough Scrub / Extra Wash / Hi Temp
*
J1
J1
J1
J1
J1
J3
J3
Auto Clean / Sensor Clean
*
*
Heated Dry
*
Sanitize
*
*
Hi Temp Wash
Model ID Jumper
Start / Cancel
Delay
*
(Front Only Controls)
Pin 9 - Pin 6
Connector
Measure Between
Pin 9 - Pin 5
(Top Only Controls)
Cycle Select
Start / Cancel
Delay
*
J1
J1
J1
J1
J1
J1
J1
Pin 10 - Pin 6
Pin 10 - Pin 7
Pin 10 - Pin 8
Pin 11 - Pin 7
Pin 12 - Pin 5
Pin 12 - Pin 7
Measure Between
Pin 10 - Pin 6
Pin 10 - Pin 7
Pin 10 - Pin 8
Pin 11 - Pin 7
Pin 12 - Pin 6
Pin 13 - Pin 12
Pin 13 - Pin 14
Connector
J1
J1
J1
J1
J1
J1
J1
Insta Wash
*
Tough Scrub Plus / Super Scrub / Power Scrub
*
Tough Scrub Plus / Super Scrub
*
Tough Scrub / Extra Wash / Hi Temp
Insta Wash
Model ID Jumper
*
160° Option
*
Tough Scrub / Extra Wash / Hi Temp
*
*
Model ID Jumper
Start Cancel
Delay
*
An unpressed switch will read as an open circuit.
A pressed switch will read as 10k
* On select models
.
Load Readings
Measure Between
ST1 (Heater) - ST11 (Dlb Neutral)
ST5 (Motor Common) - ST8 (Motor Main)
ST6 (Drain) - ST4 (Dlb Line)
Result
16
3 to 4
Heater¹
Wash Motor
Drain Motor
25
Dispenser Wax Motor
Water Valve²
Thermistor
J6 Pin 3 (Disp) - ST4 (Dlb Line)
J6 Pin 4 (Inlt) - ST4 (Dlb Line)
J5 Pin 1 (Temp) - J5 Pin 4 (Neutral) See Component Info
2k
1.1k
Notes:
1. This value assumes the high limit thermostat is closed.
2. This value assumes the float switch is closed.
3. Results are approximated values.
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Electrical Diagnostics
WARNING
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!
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Control Definition
WARNING
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!
Designed to provide a
longer cycle for
Designed to auto
washing items with
select the number
heavy food soils.
of fills and length
water usage is 8
of wash times
gallons.
based on soil
level of dish
load. Water
usage ranges
from 3 to 8
Designed to wash
loads containing
dishes with normal
amounts of food
gallons.
soils. Water usage
ranges from 3 to
6 gallons.
Delays the start of
the dishwasher
based on user
selection.
Designed for light
food soils. The
cycle ends with
a rinse and does
not include drying.
water usage is 4
gallons.
This option improves drying
results by turning the heating
element on and off during the
dry portion of the cycle.
Rinses dishes being
This option monitors
cycles for sanitization.
held until the dishwasher
is full, and another cycle
is selected. This cycle
helps reduce the
potential for developing
odors. Water usage
is 2 gallons.
This option raises
Temperature in the
Final rinse to 160° F
Light Wash- Designed to wash loads containing dishes that are lightly soiled Water usage is 5 gallons.
Insta Wash-
Auto Clean-
Designed to wash loads containing dishes that are lightly soiled Water usage is 5 gallons.
Designed to auto select the number of fills and length of wash times based on soil level of dish load.
Water usage ranges from 3 to 8 gallons.
Tough Scrub- This option adds fills, heat and/or wash time to the wash cycle.
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Control Definition/Motor Connectivity
WARNING
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!
Wire harness
Connection plug
(Start)
Green
(Ground)
Yellow
(Main)
Blue(Common)
1/3HP
120V/60hz, 3.2 amps, 3250 RPM
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Cycle Chart
WARNING
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!
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Wiring Diagram
WARNING
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!
OVERLOAD
MAIN
GROUND
START
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