Whirlpool 72972 Tech Sheet

TECH SHEET - DO NOT DISCARD
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.
Damp Dry Test
Begin with an empty dryer and clean lint
screen.
1. Set the following configuration:
Timer - DAMP DRY
Fabric Care/Temperature switch -
COTTON / TOWELS HIGH
Wrinkle Guard switch - OFF
Signal switch - HIGH
Door - must be closed
FOR SERVICE TECHNICIAN'S USE ONLY
2. Press the Push To Start (PTS) switch. After
approximately 16 seconds, the Timer will
start to advance to the OFF position, and
the "End of Cycle" signal will sound. If one
or more of these functions do not occur,
proceed to the Factory Test.
Factory Test
The Factory Test allows factory/service person-
nel to test and verify all inputs to the Even Heat
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.
Activating the Test Mode
1. Set the following configuration:
Door - must be open
Fabric Care/Temperature switch -
AIR FLUFF
Signal switch - HIGH
Timer - TIMED DRY or AUTO MOISTURE
SENSING PLUS selection
2. Turn the Wrinkle Guard switch from OFF to
ON three times within a five second period.
A double beep, pause, triple beep will
sound to indicate that the factory 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 the Factory Test mode,
every input change of state will result in a beep
(with the exception of the Signal switch). This
includes:
Door switch
Moisture Sensor (short/open Sensor will
result in a beep). The Moisture Monitor
lights cycle through each change of
→ →
state. (Wet Damp Cool Down
Wet, etc.) NOTE: A moistened finger or
damp cloth may also be used.
Fabric Care/Temperature switch
Wrinkle Guard 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, pro-
ceed to the following component tests.
Timer Test
Perform the Factory Test to determine that the
timer motor advances (should run continu-
ously).
To determine if the Even Heat Control is send-
ing the required pulse sequences to the timer
motor:
1. Set the Volt/Ohmmeter to read up to
120VAC.
2. Place the probes at PT01 and P1-1 on the
Even Heat Control.
3. Operate the dryer in the TIMED DRY cycle.
Meter should read ON 7 sec., OFF 113
seconds.
Remove the wires from timer terminals to com-
plete this test.
Reference
contact
continuity
to Timer -
BK.
Timer Encoding Table
TIMED DRY MODE
TIMER TIMED
CONTACTS DRY
W to BK O
R to BK X
V to BK O
BU to BK X
AUTO MOISTURE SENSING PLUS MODE
TIMER MORE
CONTACTS DRY
W to BK X
R to BK O
→ →
Off
V to BK X
BU to BK X
O = OPEN
PAGE 1
COOL WRINKLE
OFF
DOWN GUARD
O O O
X O O
X X O
X X O
NORMAL DAMP WRINKLE
OFF
DRY DRY GUARD
X O O O
O O O O
O O X O
X X X O
X = CLOSED
PART NO. 3979119