Troubleshooting Tests; Main Control Connectors & Pinouts - Whirlpool MAT20CS Manual

TROUBLESHOOTING TESTS

TEST #1: Main Control
This test checks for incoming and outgoing supplies to and
from the main control. This test assumes that proper voltage
is present at the socket/outlet.
1. Unplug washer or disconnect power.
2. Remove console to access main control.
3. Verify that ALL connectors are inserted all the way into the
main control.
4. Plug in washer or reconnect power.
5. With a voltmeter set to AC, connect black probe to J7-3
(Neutral) and red probe to J7-1 (L1).
= represents pin-1
12
FOR SERVICE TECHNICIAN'S USE ONLY
Main Control Board Connectors and Pinouts (Figure 3)
J2
J2-5 OPEN
J2-4 BLK +13VDC
J2-3 GRY -5VDC (CIRCUIT EARTH)
J2-2 PNK RPM INPUT
J2-1 BLU SHIFTER POSITION INPUT

J3
J3-10 BLK TEMP THERMISTOR INPUT (HYBRID)
J3-9 BLK TEMP THERMISTOR EARTH (HYBRID)
J3-8 OPEN
J3-7 OPEN
J3-6 OPEN
J3-5 BLU COLD VALVE (L1)
J3-4 RED HOT VALVE (L1)
J3-3 OPEN
J3-2 OPEN
J3-1 WHT NEUTRAL

J7
J7-3 BLK NEUTRAL
J7-2 GRN CHASSIS EARTH
J7-1 BLK L1
J4-Not Used
Diagnostic
LED
J7-Mains
Lead
J7
J16-Drive Motor/
Drain Motor
 I f line voltage is present, go to step 6.
 I f line voltage is not present, check the AC mains lead
for continuity (See Figure 9).
6. Is the "Diagnostic LED" ON or OFF? (See Figure 3 below
for LED location.)
 O N: (+5 VDC present) continue to step 7.
 O FF: (+5 VDC missing) proceed to step 8.
7. With a voltmeter set to DC, connect black probe to J2-3
(Circuit Earth) and red probe to J2-4 (+13 VDC).
 If +13 VDC is present, main control supplies are good.
 If +13 VDC is not present, go to step 8.
J10
J10-6 RED
J10-5 RED
J10-4 RED
J10-3 RED
J10-2 RED
J10-1 RED

J11
J11-6 BLK
J11-5 BLK
J11-4 BLK
J11-3 BLK
J11-2 BLK
J11-1 BLK

J15
J15-4 RED
J15-3 WHT
J15-2 BLU
J15-1 YEL

J16
J16-7 ORN
J16-6 RED
J16-5
J16-4 WHT
J16-3 LT BLU DRAIN PUMP MOTOR (L1)
J16-2 W/ BLU SHIFTER MOTOR (NEUTRAL)
J16-1 BRN

J2-Shifter J11-Jumper Board
J11 J10
J4
J2
J16
J15
J15-Lid Lock
ROW 4
ROW 5
COLUMN 0
COLUMN 1
COLUMN 2
COLUMN 3
ROW 2
ROW 3
COLUMN 0
COLUMN 1
COLUMN 2
COLUMN 3
LOCK SWITCH
NEUTRAL
LID SWITCH INPUT
LOCK SWITCH SOLENOID (L1)
MOTOR CCW WINDING (L1)
MOTOR CW WINDING (L1)
OPEN
MOTOR (NEUTRAL)
SHIFTER MOTOR (L1)
J10-Temperature
Selector
J3-Temperature
Sensor/Inlet Valves
J3
DO NOT REMOVE OR DESTROY