Troubleshooting Tests - Maytag MED6400TQ0 Manual

TECH SHEET - DO NOT DISCARD
Figure 2. Component locations.

TROUBLESHOOTING TESTS

NOTE: These checks are done with the dryer
unplugged or disconnected from power.
TEST #1 Supply Connections
This test should only be done after
confirming proper voltage at the outlet.
1. Unplug dryer or disconnect power.
2. Remove the cover plate from the back of
the dryer. See figure 3.
Cover Remove Screw
Plate
Figure 3. Remove the cover plate.
3. Make sure the power cord is securely
fastened to the terminal block.
FOR SERVICE TECHNICIAN'S USE ONLY
11
4. With an ohmmeter, check for continuity
between the neutral (N) terminal of the
plug and the center contact on the
terminal block. See figure 4.
Power Cord Terminal Block
Plug
N
COM
Figure 4. Plug-to-terminal connections.
If there is no continuity, replace the
power cord and test the dryer.
If there is continuity, go to step 5.
5. In a similar way, check which terminal of
the plug is connected to the left-most
contact on the terminal block and make a
note of it. This will be L1 (black wire) in
the wiring diagram. See figure 4 above
and wiring diagram, page 4.
When this is found, go to step 6.
If neither of the plug terminals have
continuity with the left-most contact of
the terminal block, replace the power
cord and test the dryer.
6. Access the machine control electronics
without disconnecting any wiring to the
control board. See Accessing &
Removing the Electronic Assemblies,
page 11.
7. With an ohmmeter, check for continuity
between the L1 terminal of the plug
(found in step 5) and P9-2 (black wire) on
the machine control board. See figure 15,
page 11.
If there is continuity, go to step 8.
If there is no continuity, check that
wires to the terminal block are
mechanically secure. If so, replace the
main wire harness and test the dryer.
8. Check for continuity between the neutral
(N) terminal of the plug and P8-3 (white
wire) on the machine control board.
If there is continuity, go to step 9.
If there is no continuity and the
mechanical connections of the wire are
secure, replace the main wire harness.
9. Visually check that the P5 connector is
inserted all the way into the machine
control electronics.
10. Visually check that the user interface
assembly is properly inserted into the
front console.
11. If both visual checks pass, replace the
user interface assembly.
12. Plug in dryer or reconnect power.
13. Perform the Console Buttons and
Indicators Diagnostic test, page 1, to
verify repair.
14. If indicators still do not light, the
machine control electronics has failed:
Unplug dryer or disconnect power.
Replace the machine control
electronics.
Plug in dryer or reconnect power.
L1
Perform the Console Buttons and
Indicators Diagnostic test, page 1 to
verify repair.
TEST #2 Machine Control
Power Check
This test is used to determine if power is
present at the machine control electronics.
NOTE: The drum light is controlled by the
machine control on all models.
1. Plug in dryer or reconnect power.
2. Open the door.
If the drum light illuminates, then
power is present at the machine
control. Go to TEST #6, page 10.
If the drum light fails to illuminate,
do not assume the machine control
electronics needs replacement.
Several conditions may cause the
drum light not to illuminate, including
a bad bulb. If the drum light does not
illuminate, go to TEST #1, at left.
PAGE 6
PART NO. W10114194A