Maytag MHW9000YW0 Mode D'emploi page 16

FOR SERVICE TECHNICIAN'S USE ONLY
11. Run the "Quick Diagnostic Test" on page
6. IMPORTANT: Door must be closed and
locked to run motor.
12. When the test shows "C05 & C08" on the
display, the motor is powered and line voltage
from the CCU should be present across pins
1 & 2 of connector MS2.
 If line voltage is present, replace the MCU.
 If line voltage is not present, replace the CCU.
13. Unplug washer or disconnect power.
14. Reassemble all parts and panels.
15. Perform the "Quick Diagnostic Test"
on page 6 to verify repair.
TEST #4: Door Lock System
Perform the following test if "Door Status"
does not change under Component Activation
on page 7.
1. Check lid lock mechanism for obstruction
or binding. Repair as necessary.
2. Unplug washer or disconnect power.
3. Remove top panel to access machine
electronics.
4. Visually check that the DL3, DLS2, and
DCS3 connectors are inserted all the way into
the CCU. Refer to CCU diagram on page 13.
 If visual check passes, go to step 5.
 If any of the connectors are not inserted
properly, reconnect and retest door lock.
5. Referring to the chart below, disconnect the
specified connectors from the CCU. With an
ohmmeter, verify resistance values listed in the
chart. NOTE: To measure the door lock switch in
the "locked" position, plug in washer or reconnect
power. Press the POWER button, select any
cycle, and then press and hold the START button
for 3 seconds. Actuation of the door lock solenoid
should be heard. At that point, unplug the washer
and disconnect DLS2 from the CCU and measure
resistance across pins 1 & 2.
DOOR LOCK RESISTANCE
Component Resistance
Door Closed = Continuity
Door Switch
Door Open = Open Circuit
Lock Coil = 50–200
Door Lock
Coils
Lock Coil = 50–200
Door Lock Locked = Continuity
Switch Unlocked = Open Circuit
 If resistance values are good, go to step 6.
PAGE 16
Contacts
Measured
DCS3-1 DCS3-3
DL3-1 DL3-2
Ω
DL3-2 DL3-3
Ω
DLS2-1 DLS2-2
 If any of the measurements do not match the
values shown in the chart, check the harness
of the suspected component between the
CCU and door lock mechanism for continuity.
 If the harness and connections are
good, replace the door lock mechanism.
IMPORTANT: To minimize risk of damage
to door lock/switch wires, remove the door
lock mechanism screws before removing
the front panel.
6. If the preceding steps did not correct the
lock problem, replace the CCU and retest door
lock mechanism.
 Unplug washer or disconnect power.
 Replace the CCU.
 Reassemble all parts and panels.
 Perform the "Quick Diagnostic Test"
on page 6 to verify repair.
TEST #5: Drum Light
Perform the following test if the "Drum Light"
does not turn On or Off under Component
Activation on page 7.
1. Depending on brand, press or press and hold
the drum light button on the console until the
LCD screen acknowledges the drum light is on.
 If the LCD does not confirm the button
press, replace the UI.
 If the LCD confirms the button press,
go to step 2.
2. Unplug washer or disconnect power.
3. Remove the top panel to access CCU
and user interface (UI).
4. Verify the drum light connector (P13) is
securely connected to the UI. See Figure 12,
page 14.
5. Check harness and connections between
the drum light and the UI.
 If the connections are OK, go to step 6.
 If not, repair or replace as needed.
6. Unplug the drum light connector (P13)
from the UI.
7. Plug in washer or reconnect power.
8. Press, or press and hold the drum
light button on the console until the LCD
acknowledges the drum light is on.
9. With a multimeter set to milliamps, measure
the current across UI connector P13, pins 1
DO NOT REMOVE OR DESTROY