Maytag MED5920TW0 Manual

TECH SHEET - DO NOT DISCARD
WARNING
Electrical Shock Hazard
Disconnect power before
servicing.
Replace all parts and
panels before operating.
Failure to do so can result
in death or
electrical shock.
IMPORTANT
Electrostatic Discharge (ESD)
Sensitive Electronics
Do not open package until it is time to
install the electronic board.
ESD problems are present everywhere.
ESD may damage or weaken the
electronic board. The new board may
appear to work well after repair is
finished, but failure may occur at a later
date due to ESD stress.
Use an anti-static wrist strap. Connect
wrist strap to green ground connection
point or unpainted metal in the
appliance
-OR-
Touch your finger repeatedly to a green
ground connection point or unpainted
metal in the appliance.
Before removing the part from its
package, touch the anti-static bag to a
green ground connection point or
unpainted metal in the appliance.
Avoid touching electronic parts or
terminal contacts; handle electronic
board by edges only.
When repackaging failed electronic
board in anti-static bag, observe above
instructions.
FOR SERVICE TECHNICIAN'S USE ONLY
DIAGNOSTIC GUIDE
Before servicing, check the following:
Make sure there is power at the wall
outlet.
Has a household fuse blown or circuit
breaker tripped? Time delay fuse?
Is dryer vent properly installed and
clear of lint or obstructions?
All tests/checks should be made with
a VOM (volt-ohm-milliammeter) or
DVM (digital-voltmeter) having a
sensitivity of 20,000 Ω per volt DC or
greater.
Check all connections before
replacing components. Look for
broken or loose wires, failed terminals,
or wires not pressed into connectors
far enough.
A potential cause of a control not
functioning is corrosion on
connections. Observe connections
and check for continuity with an
ohmmeter.
Connectors: Look at top of connector.
Check for broken or loose wires.
Check for wires not pressed into
connector far enough to engage metal
barbs.
Resistance checks must be made with
dryer unplugged or power
disconnected.
LESS DRY TEST
Begin with a fully assembled, empty dryer
with clean lint screen. Be sure dryer is
connected to a known good power source.
1. Set the following configuration:
Door - must be closed
Timer - Less Dry
Temperature switch - High
End of Cycle Signal switch - On
2. Press the Push to Start (PTS) switch.
After approximately 16 seconds, the
Timer will start to advance to the Off
position. If this function does not occur,
proceed to the Diagnostic Test.
DIAGNOSTIC TEST
This diagnostic test allows factory/service
personnel to test and verify all inputs to the
electronic control. The basic operation of this
test is to notify the operator with an audible
beep every time the status of an input to the
control changes state.
This test is performed with a fully assembled
dryer, connected to a known good power
source.
Activating the Test Mode
1. Set the following configuration:
Door - must be open
Temperature switch - Air Fluff
End of Cycle Signal switch - On
Timer - Timed Drying or Sensor Drying
selection
2. Turn the Wrinkle Prevent switch from Off
to On three times within a five second
period. A single beep, a pause, then a
single beep will sound to indicate that the
test mode is activated.
NOTE: If any of these initial conditions are
not satisfied, the control will not enter the
test mode.
Test Mode Functionality
When the control is in test mode, every input
change of state will result in an audible beep
(with the exception of the End of Cycle Signal
switch). This includes:
Door switch
Moisture Sensor (short/open Sensor
will result in a beep)
NOTE: A moistened finger or damp
cloth may also be used.
Temperature switch
Wrinkle Prevent switch
Push to Start (PTS) switch (with the
door switch closed)
Timer (any cam input change will result
in a beep)
NOTE: Timer will advance during test.
If any of the inputs do not result in a beep,
proceed to the corresponding component
tests, beginning on page 4.
PART NO. W10114943A
PAGE 1