Maytag 111990" Automatic Dryers Service Manual page 16

NOTE: This amount of time is for
Regular Fabrics on a Less Dry setting.
A setting of Normal Dry or More Dry
will add more time before the dryer
shuts off. If the dryer does not shut off,
then the problem is in the electronic
control assembly.
Sensor Assembly
1. Disconnect power supply.
2. Remove front panel.
3. Remove wires going to the sensor
bars.
4. Check with ohmmeter to make sure
there is NO continuity across the
sensor bars. If you have continuity
across the sensor bars the capacitor
cannot build a charge, it will contin-
ually bleed off.
CAUTION
Always disconnect power supply
before making continuity or
resistance checks.
5. Check to make sure the sensor bar
(the one not connected to cabinet
ground) is not shorted to cabinet
ground. If this sensor bar has a
leakage path to cabinet ground, the
capacitor cannot build a cllarge and
will continually bleed off. Use
ohmmeter to
~heck
from sensor bar
to cabinet ground.
Electronic Control Assembly
If dryer does not go into cool-down and
shut off with the sensor disconnected
the problem is in the electronic control
assembly. While the dryer is running,
observe the neon bulb on the electronic
control (printed circuit board). When
the capacitor reaches approximately 72
volts, the neon bulb "fires" (flashes),
the SCR conducts, the relay coil is
energized and the contacts in the relay
close.
If neon bulb "FIRES" but timer does
not advance (timer motor is not ener-
gized):
1. Check relay coil for continuity or
resistance.
A. Disconnect power supply.
B. Remove BK and BR wires from
relay (refer to electrical wiring
diagram).
C. Attach meter leads across these
terminals and complete check. If
checking resistance, you should see
about 2200 ohms of resistance. No
continuity, replace relay.
2. Check continuity across contacts
O-BK to RD in relay. When closed,
this set of contacts is used to keep
the coil energized.
A. Disconnect power supply.
B. Remove wires O-BK and RD
from relay.
CAUTION - - - - - - - - - - - - - - - - - - - - - - - - - - ,
Always disconnect po~er supply before making any continuity checks or
resistance readings.
ED/GD401 1090
SECTION 2. ELECTRICAL - MECHANICAL TROUBLESHOOTING
2-4