Maytag MGD6500MBK Technical Manual page 24

➢ If the test doesn't complete by touching the moisture sensor, continue
with step 3.
3. Unplug dryer or disconnect power.
4. Remove console to access the machine electronics.
5. Access the moisture sensor wires and disconnect the 3-wire moisture
sensor connector. See pages 42 and 43 for moisture sensor access.
6. Access the ACU and remove connector J13 from the circuit board.
Check the wire harness for continuity between J13 and the moisture
sensor connector.
➢ If there is continuity, go to step 7.
➢ If there is no continuity, replace the main harness.
7. Measure the resistance across the outermost contacts of the connector
that includes the two MOVs.
➢ If a small resistance is measured, clean the two metal moisture strips
inside the drum.
➢ If a small resistance is measured after cleaning, replace the sensor
harness.
➢ If a small resistance is not measured, go to step 8.
8. Measure the resistance across each of the outermost contacts and the
center terminal (ground connection).
➢ If a resistance less than infinity is measured, replace the sensor harness.
9. If the moisture sensor diagnostic test passes, check the outlet thermistor:
TEST #4a, page 22.
10. If the preceding steps did not correct the problem, replace the ACU.
TEST #6: HMI
This test is performed when any of the following situations occurs during the
"Button Activation & Encoder Test" or no sound is heard after the End of the
Cycle and MUTE option is OFF.
3 None of the LEDs turn on.
3 Some buttons do not respond.
3 No beep sound is heard.
None of the LEDs turn on:
1. Unplug dryer or disconnect power.
2. Remove console to access the ACU and HMI.
3. Visually check that ALL ACU connectors are inserted all the way into the
ACU.
4. Visually check that ALL HMI connectors are inserted all the way into the
HMI.
5. If all visual checks pass, perform
verify supply voltages.
➢ If supply voltages are present, replace the HMI.
➢ If supply voltages are not present, replace the ACU.
6. Reassemble all parts and panels.
7. Plug in dryer or reconnect power.
8. Perform the "Button Activation & Encoder Test" (see
repair.
24
FOR SERVICE TECHNICIAN'S USE ONLY
page
Test #1: ACU Power Check, 18
page 12) to verify
Some buttons do not respond:
1. Unplug dryer or disconnect power.
2. Remove console to access the ACU and HMI.
3. Replace the HMI.
4. Reassemble all parts and panels.
5. Plug in dryer or reconnect power.
6. Perform the "Button Activation & Encoder Test" (see
repair.
No beep sound is heard:
1. Verify that the MUTE option is OFF.
2. Unplug dryer or disconnect power.
3. Remove console to access the ACU and HMI.
4. Visually check that ALL ACU connectors are inserted all the way into the
ACU.
5. Visually check that ALL HMI connectors are inserted all the way into the
HMI.
6. If all visual checks pass, perform Test #1: ACU Power Check, page 17,
to verify supply voltages.
- If supply voltages are present, replace the HMI.
- If supply voltages are not present, replace the ACU.
7. Reassemble all parts and panels.
8. Plug in dryer or reconnect power.
9. Perform the "Button Activation & Encoder Test,
TEST #7: Door Switch
Functionality is verified when opening the door turns on the drum light.
Closing the door should turn off the drum light.
If the preceding conditions are not met:
1. Unplug dryer or disconnect power.
2. Remove console to access the machine electronics.
3. Check that the wires between the door switch and ACU are connected.
(Refer to wiring diagrams on pages 26, 27 and 28).
➢ If the connections are good, replace the wire and door switch assembly
and retest.
➢ If wire and door switch assembly have been replaced and dryer still does
not start, replace the ACU.
4. Reassemble all parts and panels.
5. Plug in dryer or reconnect power.
6. Verify that the dryer will start with the door closed, and that it stops when
the door opens.
TEST #8: Water Valve
(on some models)
Activate Service Test Mode (see
Mode Chart (see page
See figure 11.
NOTE: Refer to strip circuit on
If no water is sprayed into the drum during steam cycles:
1. Inside the drum, unscrew the water nozzle.
2. Inspect nozzle opening for residue buildup;clean and replace it.
➢ If no water is sprayed in the drum:
1. Verify that water is connected and turned on.
2. Unplug dryer or disconnect power.
, to
3. Remove console to access the machine electronics.
page
page 12). Advance to Step 3 in Service Test
13). Verify that water is being sprayed into the drum.
page 26 to diagnose water valve.
page 12) to verify
12, to verify repair.