Technical Information- Dishwasher

JDB4000AWB JDB4000AWQ JDB4000AWS JDB4000AWW MDB5600AWB MDB5600AWQ MDB5600AWS MDB5600AWW

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.

!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, unless testing requires power.

Component Specifications

!WARNING

To avoid risk of electrical shock, personal injury, or death, disconnect power to dishwasher before servicing, unless testing requires it.

1/3HP

120V/60hz, 3.2 amps, 3250 RPM

Main Wattage, 285 watts

Start Wattage, 1115 watts

Control Board See Component Specifications/ Membrane Readings for troubleshooting/pin-out instructions.

Component Specifications

!WARNING

To avoid risk of electrical shock, personal injury, or death, disconnect power to dishwasher before servicing, unless testing requires power.

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

A Manual Function Test may be started by pressing the Normal Wash key 5 times followed by the Start key within 6 seconds.

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:

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 times out, is cancelled, or another key is pressed. To cancel test, press the

Start / Cancel keypad.

Sales Floor Demo Mode

Press Extra Rinse keypad 5 times within 6 seconds. The LEDs will illuminate in a progressive order until all are lit. All LED???s will stay on for 1 second then all 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 mode will repeat.

To cancel, press the Start / Cancel keypad.

Diagnostic Tips

To check control LEDs, enter Sales Floor Demo Mode. If control fails to perform as described, replace control. To check control 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.

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.

Membrane Readings

(Front Only Controls)

An unpressed switch will read as an open circuit. A pressed switch will read as 10 k ohms.

* On select models

Field Service Test

A Field Service Test may be started by pressing the Heavy Wash key 5 times followed by the Start key within 6 seconds. This test must be performed with clean water to insure proper sensor performance.

???88??? will appear in the display (if available*) and the following sequence of events will occur:

Time frame for Thermistor/Turbidity Sensor check & calibration may vary slightly.

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 illuminate per Sales Floor Demo Mode. If the dishwasher door is opened during the test, the test sequence will pause, and resume when the door is closed. To the cancel test, press the Start / Cancel keypad.

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 (See Note**) LED and one of the following:

Turbidity Sensor - failure - Rinse Only LED

Thermistor - failure - Heavy Wash LED

Motor - high current - Normal Wash LED

Motor - low current - Light Wash LED

Memory Failure - Heated Dry LED

*On select models

**On units with Front Controls only, this will be the Clean LED, on units with Top & Front Controls, this will be the Delay LED

Membrane Readings

(Front & Top Controls)

An unpressed switch will read as an open circuit. A pressed switch will read as 10 k ohms.

* On select models

Load Readings

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.

WARNING

disconnect to dishwasher before servicing,

Circuit Board

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!

Electrical Diagnostics

powerTo avoid risk of electrical shock, personal injury, or death, unless testing requires power.

To check continuity from ends of power leads to control board through door switches

(A white plastic latch must be inserted in the latch assembly for this test.)

2> With one ohm meter lead connected to the white (neutral) power lead, you should have continuity at stake lugs 10 & 11.

> With one ohm meter lead connected to the black (line) power lead, you should have continuity at stake lugs 3 & 4, and pin # 8 on connector J5.

3Perform the resistance checks on the component(s) in question at the locations shown on the chart.

* Select Models Only.

** Nominal value for ohms of electrical resistance of component only. These values will vary slightly due to the additional resistance of the wire harness. Greater variation can occur if the component is still warm from being energized during testing.

*** A resistor in the control board wired in parallel will result in an approximate reading of 4.0 k ohms with connector J5 plugged in.

Wash Motor

(3 - 4**)

Heater (14.5 - 16.5**) (High limit t'stat must be closed)

Always remove power to the unit

before performing any resistance or

continuity checks.

5

May 2004 ??2004 Maytag Services

Motor Connectivity

!WARNING

To avoid risk of electrical shock, personal injury, or death, disconnect power to dishwasher before servicing, unless testing requires power.

Wire harness

Connection plug

Blue (Common)

Yellow(Main)

Green (Ground)

Red (Start)

1/3HP

120V/60hz, 3.2 amps, 3250 RPM

Wiring Diagram

!WARNING

To avoid risk of electrical shock, personal injury, or death, disconnect power to dishwasher before servicing, unless testing requires power.

WH

(N)BK

KEY

W IRES NO T CON NECTED

WIRES CONNECTED

These parts are present on models with 3 racks.

! WARNING

Cycle Chart

To avoid risk of electrical shock, personal injury, or death, disconnect power to dishwasher before servicing, unless testing requires power.

Available Options:

Extra Rinse - This option adds an additional fill between the main wash and the final rinse for an additional 5 minutes of unheated rinse.

Tough Scrub - This option overrides the sensor???s decision to skip cycle functions.

Tough Scrub Plus - This option is the same as Tough Scrub but the main wash temp check is boosted to 145??F.

Temperature Options (Available on select models)

Sanitize: If the Sanitize option is available for a given cycle, it forces a temp check at the end of the main wash, a 154??F temp check prior to the rinse aid dispense in the final rinse and adds an additional 5 minutes of rinse before the rinse aid dispense.

160?? Wash: If the 160?? Wash option is available for a given cycle, it forces a 160??F temp check prior to the rinse aid dispense in the final rinse.

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