Maytag Epic MED/GD9600S, Техническое образование

Страница: 58 / 75

6-1
DIAGNOSTICS
DIAGNOSTICS AND TROUBLESHOOTING
IMPORTANT
Electrostatic Discharge (ESD)
Sensitive Electronics
ESD problems are present everywhere. ESD
may damage or weaken the electronic con-
trol board. The new control assembly 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 pack-
age, 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 control board
by edges only.
• When repackaging failed electronic con-
trol board in anti-static bag, observe above
instructions.
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
or DVM having a sensitivity of 20,000 ohms
per volt DC or greater.
• Check all connections before replacing com-
ponents. Look for broken or loose wires,
failed terminals, or wires not pressed into
connectors far enough.
• The most common cause for control failure is
corrosion on connectors. Therefore, discon-
necting and reconnecting wires will be nec-
essary throughout test procedures.
• Connectors: Look at top of connector. Check
for broken or loose wires. Check for wires not
pressed into connector far enough to en-
gage metal barbs.
• Resistance checks must be made with power
cord unplugged from outlet.
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.
WARNING