Maytag MDB7650AWB, MDB7600AWB, MDB7600AWW, MDB7650AWS, MDB6600AWQ User Manual

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Technical Information- Dishwasher

MDB6600AWB MDB6600AWQ MDB6600AWS MDB6600AWW MDB7600AWB MDB7600AWQ MDB7600AWS MDB7600AWW MDB7650AWB MDB7650AWQ MDB7650AWS MDB7650AWW

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.

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

Specifications MDB6600AW*

MDB7600AW* MDB7650AW*

Power Source

Voltage AC 120 VAC Heavy Wash X X X Amperage (Single Unit) 15 A Normal Wash X X X Frequency 60 Hz Light Wash X X X Motor horsepower 1/3 Rinse Only X X X Receptacle N/A Auto Clean X X X Plug N/A Drying System X X X Dimensions Features Height−overall Width 23 7/8” QuietSeries 200™ X Depth 23 1/2” *ToughScrub™ X X X Weight Un-crated 65 lbs. *Sanitizer X X X

*On selected models only

33 ½” to 35 ¼” QuietSeries 300™ X X

Wash cycles 5 5 5

*Extra Rinse X X X

2/4/6 Hour Delay

1-9 Hour Delay

Control Lock X X X Energy Star X X X Active Vent Dry X X X Finer Filtration X X X Hard Food Disposer Remaining Time Countdown Display 11 Touch Pad Controls

WARNING

Benefits MDB6600AW* MDB7600AW* MDB7650AW*

Start

X X

Start

X X X

Component Specifications

WARNING

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

Illustration Component Test Procedure Results

Dishwasher Motor

CCW rotation only viewed from shaft end.

1/3HP 120V/60hz, 3.2 amps, 3250 RPM Main Wattage, 285 watts Start Wattage, 1115 watts Control Board See Component Specifications/

Measure resistance from ST5 (Motor Common – blue) to ST8

(Motor Main - yellow) ...........................

See Component Specifications/Motor Connections for details.

Membrane Readings for troubleshooting/pin-out instructions.

3 to 4 Ω

Water valve

120V/60hz, 7 watts

1.13 ± .10 gpm at 20120 psi

Measure resistance from J6 Pin 4 Aqua (Float switch) to ST4

Black (Common) .................................

1.1 k Ω (This value assumes the float switch is closed).

Vent wax motor

120V with 1/4" actuation stroke within 60 seconds

Measure resistance from J6 Pin 1 Purple (Vent) to ST4 Black (Common)

1.2 k Ω

Dispenser wax motor

120V with 1/4" actuation stroke within 60 seconds

Measure resistance from J6 Pin 3 Tan (Dispenser) to ST4 Black

(Common) ..........................................

2 k Ω

Component Specifications

WARNING

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

Illustration Component Test Procedure Results

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

Heater/Heating Element

120v/60hz, 650 watts ± 5% in air, 830 watts ± 5% in coldwater

Drain Motor

120v/60hz

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) .....................................

Measure resistance from ST1 Red/Black (Heater) to ST11 White

(Common) ..........................................

Measure resistance from ST6 Gray (Drain) to ST4 Black

(Common) ..........................................

See section “Motor Connections and Diagram” for wiring contacts.

Infinite Ω = Open 0 Ω = Closed

16 Ω (This value assumes the high limit thermostat is closed).

25 Ω

Component Readings/Testing

WARNING

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

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

The LED will 3 times indicating manual test mode is

Normal Wash Flash

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 . The test will cancel 120 seconds after the last keypad is press ed. The display (if ava ilabl e) will show ‘99’ until the remaini ng timeout period is less than 99 seconds. At this point it will countdown until the mode times out, is can celled, or anot her key is presse d. To cancel test, pres s the

Start / Cancel

Press 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 inter val and repeat until this mode is terminated. This mode will repeat. To cancel, press the keypad.

To check control LEDs, enter . If control fails to perform as described, replace control. To check control and components, enter

Field Service Test

fault is detected, determine failure as described i n the . If a load component failure has been diagnosed, proceed to the

Test Manu al Function Test

compon ent as needed.

Note High Current Low Current Motor Error

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.

keypad.

Extra Rinse

. To check individual load components for proper operation, enter

. Follow test procedure as described. Repair or replace

: The or may be detected during

Manual Function Test

Start

Heavy Wash Normal Wash Light Wash Rinse Only

Sanitize Heated Dry

Wash Motor Drain Motor Wate r Val ve Soap Di spenser (cycle once) Rinse Aid (cycle twice) Ven t Heating Element

Normal Wash

Sales Floor Demo Mode

Start / Cancel

Diagnostic Tips

Sales Floor Demo Mode

. If control fails to perform sequence as described, and a

Field Service Test

Manual Function

Membrane Readings

(Front Only Controls)

Connector Heavy Wash Normal Wash Light Wash Rinse Only Auto Clean Start / Cancel Delay Heated Dry Sanitize Tough Scrub Tough Scrub Plus Extra Rinse Model ID Jumper

An unpressed switch will read as an open circuit. A pressed switch will read as 10 k ohms. * On select models

J1 J1 J1 J1 J1 J1 J1 J1 J1 J1 J1 J1 J1

Heater¹ Wash Motor Drain Motor Vent Wax Motor Dispenser Wax Motor Wat er Val ve ² Thermi stor

Notes:

1. This valu e assumes t he high limit thermost at is closed.

2. This valu e assumes the floa t switch is closed.

3. Results a re approximate values.

Measure Between

Pin 9 - Pin 5 Pin 9 - Pin 6 Pin 9 - Pin 7 Pin 9 - Pin 8 Pin 10 - Pin 5 Pin 10 - Pin 6 Pin 10 - Pin 7 Pin 11 - P in 5 Pin 11 - P in 6 Pin 11 - P in 7 Pin 10 - Pin 8 Pin 11 - P in 8 Pin 12 - Pin 7

Measure between: ST1 (Heater) - ST11 (Dlb Neutral) ST5 (Motor Common) - ST8 (Motor Main) ST6 (Drain) - ST4 ( Dlb Li ne) J6 Pin 1 (Vent) - ST4 (Dlb Line) J6 Pin 3 (Disp) - ST4 (Dlb Line) J6 Pin 4 (Inlt) - ST4 (Dlb Line) J5 Pin 1 (Temp) - J5 Pin 4 (Neutral)

Load Readings

A Field Service Test may be started by pressing the key 5 times followed by the 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:

SECONDS

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

The Fi eld Service Test will not repeat. The LED will during the test mode. Indicator lights (except and the Display) wil l 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 keypad.

The control has bee n 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 Memory / S oftwa re Che ck

started. The LED and one of the following:

* On se lect models ** On units with Front Controls only, this will be the LED on units with

Top & Front Controls, this will be the LED

Auto Clean Heavy Wash Normal Wash Light Wash Rinse Only Quick Wash Heated Dry Sanitize Extra Rinse Tough Scrub Plus 160° Wash Model ID Jumper Start / Cancel Delay

An unpressed switch will read as an open circuit. A pressed switch will read as 10 k ohms. * On select models

Start

106

120 180 120

. A will occur immediately after the test is

(See Note )

See Component Info

Field Service Test

FUNCTIONS / ACTIVE LOADS

Vent Wax Motor/Water Valve Thermi stor check/Turbidity Sensor check & cali brati on - no load s acti ve. Wash Motor/Vent Wax Motor/Dispenser Wax Motor Wash Motor/Heater/Vent Wax Motor Drain Pump Wate r Val ve

Heavy Wash

Start / Cancel

Heavy Wash

Heavy Wash Flash

Turbidity Sensor Rinse Only Thermistor Heavy Wash

- high current - LED

Motor Normal Wash

- low current - LED

Motor Light Wash Memory Failure Heated Dry

- failure - LED

- LED

Delay

Clean ,

Membrane Readings

(Front & Top Controls)

Measure Between

Pin 10 - Pin 5 Pin 9 - Pin 5 Pin 9 - Pin 6 Pin 9 - Pin 7 Pin 9 - Pin 8 Pin 10 - Pin 6 Pin 11 - Pin 5 Pin 11 - Pin 6 Pin 11 - Pin 8 Pin 10 - Pin 7 Pin 10 - Pin 8 Pin 12 - Pin 8 Pin 9 - Pin 5 Pin 9 - Pin 6

Result

16 ohms

3 to 4 ohms

25 ohms

1.2 k ohms 2 k ohms

1.1 k ohms

Connector

J1 J1 J1 J1 J1 J1 J1 J1 J1 J1 J1 J1 J3 J3

Electrical Diagnostics

WARNING

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

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

Use the "Manual Function Test" [as described on the electrical schematic sheet (6 918139)] to

check components before

Pin # 1 2 3 4 5 6 7 8 Pin # 1 2 3 4 Stake Lug 11 10 9 8 7 6 5 4 3 2 1

OR RD RD AQ PU BK PU TN AQ

opening the door to perform continuity testing or replacing parts.

J5 J6

2.4K* +/- 6.5% @ 140

(1.2K**)

10K* +/- 3% @ 77

*Vent WM

connector unplugged)***

Resistance Check Points and Values

Thermistor (thru harness only with

*** 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.

still warm from being energized during testing.

** 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

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

* Select Models Only.

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

> 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.

Disp. WM

(2K**)

Circuit Board

must be closed)

Water Val ve

(float switch

(1.1K**)

WH WH

before performing any resistance or

Always

YL GY BU BK BK RD

Drain Motor

(25**)

be closed)

(High limit t'stat must

(14.5 - 16.5**)

Heater

Wash Motor

(3 - 4**)

continuity checks.

remove power to the unit

Motor Connectivity

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

WARNING

Wire harness Connection plug

Blue (Co mmo n)

Yellow

(Main)

Green

(Gro und)

(Start)

Red

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.

DOOR SWITCH

(LI)

DOOR SWITCH

(N)

KEY

WIRES NOT CONNECTED

WIRES CONNECTED

RD BK

THERMOSTAT

RD BK

HEATER

BK BU

RD BK

BU YL

YLBU RD

MAIN

OVERLOAD

WASH MO TOR

MOTOR

CAPACITOR

START

GROUND

NOTE: SOME WIRES HAVE STRIPES. STRIPED WIRES ARE LABELED WITH THE SOLID COLOR FIR ST AND THE S TRIPE COLOR SECOND.

(TERMINA L

BOX)

(TUB SHIE LD)

CIRCUIT BOARD

WH AQ

DRAIN

MOTOR

(HINGE)

EXAMPLE: A RED WIRE WITH A BLACK STRIPE WOULD BE LABELED

FLOAT

SWITCH

WATER VALVE

VENT

DISPENSER

RDAQ

OR PU RDAQ

SENSOR & THERMIST OR

COLOR CODE

AQ AQUA BK B LACK BU BLUE BR BROWN GY G RAY GN GRE EN OR ORA NGE PK P INK PU PURPLE RD RED TN TAN WH WHITE YL YELLOW

Component Information

120V / 60hz, 3.2 amps, 3250 RPM Main wattage, 285 watts Start wattage, 1115 watts

1.13 ± .1 0 gpm at 20 - 120 psi

Element 120V / 60hz, 650 wat ts ± 5% in air

830 watts ± 5% in cold water

Close at 149° ± 7°F (6 5.0° ± 3.9°C) Open at 164° ± 4° F (73. 3° ± 2.3 °C)

10k ohms ± 3% at 77°F (25°C) and

2.4k ohms ± 6.5% at 140°F (60°C)

actuation stroke within 90 seconds Detergent & Ri nse Aid - 120V incremental duty with ¼” actuation stroke within 90 seconds

185°F(85°C), 15µf + 10% / -5%

These part s are present o n

models with 3 racks.

Wash Motor 1/3 HP motor,

Water Valve 120V / 60hz, 7 watt s

Heatin

Limit Thermostat SPST ¼” terminal switch

Thermistor Resis tance a nd tol erance:

Wax Motors Vent - 12 0V continuous duty ¼”

Capacitor 300V / 50 - 60hz

Drain Motor 45 watts

Cycle Chart

WARNING

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

Notes

1. All times are approx imate.

2. Temperature checks force a maximum 20 minu te heating dela y to reach th e desired tempera ture.

3. The c ycle definition gives the minimum and maximum possible cycle lengths. Actual cycle length and executed cycle functions will vary based on the sensor input.

4. Fill l ength var ies betwe en differ ent models .

Auto Clean

Temperature Options (Available on select models)

Sanitize Sanitize

160° Wash 160° Wash

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

Available Options:

Extra Rinse

Tough Scrub

Tough Scrub Pl us Tough Scrub

: If the opti on is available for a given cycl e, 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 dis pense.

- This option overrides the sensor’s decision to skip cycle functions.

- This option is the same as but the main wash temp check is boosted to 145°F.

AUTO CLEAN CYCLE

(131 Minutes - max)

(97 Minutes - min)

- This option adds an additional fill between the main wash and the fi nal rinse for an additional 5 minutes of unheated rinse.

1:46 max

1:36 min

FILL

WASH

PRE

8:00

DRAIN

2:20

SKIP? SKIP? SKIP? SKIP?

1.46 max

1:36 min

DISP

DET

HEATED

WASH

26:00

WASH

2:00

CHECK

TEMP

140°F

DRAIN

2:00

1:46 max

1:36 min

RINSE

10:00

PRE

DRAIN

2:00

1:46 max

1:36 min

FILL

RINSE

10:00

PRE

DRAIN

2:00

1:46 max

1:36 min

RINSE

10:00

HEATED

RINSE

10:00

Available Options:

Extra Rinse

Tough Scrub

Tough Scrub Pl us Tough Scrub

- This option is the same as but the main wash temp check is boosted to 145°F.

HEATED

FILL

HEATED

FILL

HEATED

FILL

HEATED

HEAVY WASH CYCLE

(131 minutes - max)

(130 Minutes - min)

- This option adds an additional fill between the main wash and the fi nal rinse for an additional 10 minutes of heated rinse.

- This option adds and additional 5 minutes of heated wash to the pre-wash, an additio nal 12 minutes of heated wash to the main wash and an additional 5 minutes of heated rinse to the second pre-rinse.

1:46 max

1:36 min

FILL

WASH

PRE

8:00

DRAIN