Electronic Assemblies - Removal Or Replacement - Maytag Commercial MHN30PD Manual

FOR SERVICE TECHNICIAN ONLY - DO NOT REMOVE OR DESTROY
Be sure to perform the Diagnostic Tests before replacing the
system components.
Pump Motor Continuity Test
Pins
1 to 2
Motor Continuity Test
1. Unplug washer or disconnect power.
2. Disconnect the wire harness from the motor and measure the
resistance of the motor. Use the following table:
Pins
1 to 2
2 to 3
1 to 3
Transformer Connector
Primary (Black to black) 220 ohms
White to white 3 ohms
Green to green 1.2 ohms
Water Temperature Sensor
1. Unplug washer or disconnect power.
2. Disconnect the wire harness from the water temperature sensor
and measure the resistance of the sensor. Use the following table.
An abnormal condition is an open circuit. This reading can be
taken from the cable attached to the CCU terminal TH2.
Temperature
32°F (0°C)
86°F (30°C)
104°F (40°C)
122°F (50°C)
140°F (60°C)
158°F (71°C)
203°F (96°C)
Cycle Temperature Selections
Cycle
WHITES . . . . . . . . . . . . . . . . . . . . .Hot = 116.6°F (47°C)
COLORS . . . . . . . . . . . . . . . . . . .Warm = 95°F (35°C)
BRIGHTS . . . . . . . . . . . . . . . . . . . .Cold = Tap Temp.
PERM. PRESS . . . . . . . . . . . . . . . . .Warm = 95°F (35°C)
DELICATES AND KNITS . . . . . . . . . . . . .Warm = 95°F (35°C)
QUICK CYCLE . . . . . . . . . . . . . . . . .Warm = 95°F (35°C)
PART NO. W10340707A
Results
Normal = approx. 106
Abnormal = Infinity
Results
Normal = approx. 6.45
Abnormal = Infinity
Results
35.9 k
9.7 k
6.6 k
4.6 k
3.2 k
2.3 k
1 k
Wash Temp. (all rinses are COLD)
Water Valve Locations
CCU Wire Harness Connector Table
Unplug washer or disconnect power before taking ohm measurements.
Terminal Component
RP2 Wax Motor
DLS2 Door Locked Switch Continuity:
Locked/Unlocked
DL3 Door Lock Coil
Locked or Unlocked
SET2 Temperature
Sensor
DP2 Drain Pump
DCS3 Door Switch
DI6 Hot Inlet Valve #1
VCH7 Cold Inlet Valve #2
Cold Inlet Valve #3
IF2 RFI/UIC Transformer
PS8 Pressure Switch
**The number 1 pin has been marked on the bottom part of the connector.
**An infinity measurement occurs when the multimeter does not detect an ohm reading.
Manually Unlocking the Door Lock System
1. Unplug washer or disconnect power.
2. Remove the toe kick panel.
3. Reach up along the inside of the front and locate the bottom
of the latch assembly.
4. At the bottom of the latch assembly is a tear-drop shaped tab.
5. Gently pull the tab down about 6 mm (1/4") or until a click is heard.
ELECTRONIC ASSEMBLIES -
REMOVAL OR REPLACEMENT
IMPORTANT: Electrostatic (static electricity) discharge may cause
damage to electronic control assemblies. See page 1 for details.
NOTE: Be sure to perform the Diagnostic Tests before replacing the
control board.
PAGE 14
Hot Inlet
Cold Inlet
Valve #1 Valve #2
H
( ) Ohm Abnormal Pin
Value Value Connectors* Coding
1.2k Infinity** 1, 2
at 25°C
1, 2
door locked.
No Continuity:
door unlocked.
750 Infinity** 1, 3 door lock
3, 5 door unlock
Varies with Infinity** 1, 3
temperature
changes.
See above.
106 Infinity** 1, 3
Continuity 1, 2
at door close.
No continuity
at door open.
3.55k Infinity** 1, 3 (hot
valve #1)
3.55k , Infinity** 1, 3 (cold
either coil (or more than valve #2)
10% lower 5, 7 (cold
or higher) valve #3)
0 Infinity** 1, 2
(or more than
10% lower
or higher)
Infinity** for all Continuity at any 1, 2
except 4, 6 switch except 3, 4
with no water 4, 6 with no 4, 5
in tub water in tub 4, 6
Cold Inlet
Valve #3
Wire
1
1
1
1
1
1