GE WSXH208T, Техническое обслуживание руководство, Страница: 24 / 51

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agitation code (code D) to the electronic speed
control. The electronic speed control then turns the
drive motor ON again. This "reversing" process
continues, with the fast cam contacts switching back
and forth, for the duration of the wash time remaining
in the wash cycle.
The fast cam profile is designed to tumble the
clothes load 1 time CW, 1 time CCW, 2 times CW, 2
times CCW as viewed from the front of the machine.
During the first few tumble sequences, the drum may
rotate in the same direction three or four times before
changing directions. This is normal. A special cam
within the timer must cycle through a sequence
before it "unlocks" the reversing protection arm built
in the timer. This feature ensures that the drive
motor is not allowed to turn ON in the opposite
direction if it were coasting down from a high speed
spin and the timer was advanced into an agitation
cycle.
Timer Operation During Spin Mode
To understand the timing sequence of the timer
during spin, let's look at an example of what happens
during a Regular wash cycle before the timer ad-
vances into the first spin. The slow cam sets up the
water temperature switch to provide cold rinse water
by closing contacts 6B and 8A, the electronic speed
control spin code and door lock thermal safety delay
device (PTC) is turned on by closing contact 4B, the
pump is turned on by closing contact 7B, and the
motor is set up to operate on the long field winding
by closing contact 13A.
The timer has three different rinse phases. Within
each phase the timer agitates, drains, and spins. The
timer basically provides a signal code to the elec-
tronic speed control and lets it control the motor
motion.
In the rinse phase, the timer calls for an impulse
spin, where two short ramp-ups and spins occur. The
timer closes slow cam contacts 4B and 9A sending
the signal to the electronic speed control to generate
these spins.
In the second rinse, the timer calls for a normal ramp
up and spin speed at 450 rpm. The timer disables the
fast cam and closes direction contacts 21A and 23A
with a reversing protection lever that ensures the
contacts are closed at all times during spin. The
drive motor is also set up to operate on the long field
winding by closing contact 13A.
In the third spin, the spin is a two part spin. The
timer closes direction contacts 21A and 23A, and set
the drive motor to operate on the long field winding
by closing contact 13A. After 200 seconds of
spinning at 450 rpm, timer contact 13A switches over
to 13B energizing the drive motor's tapped field
winding and disabling the long field winding. Slow
cam contact 9B closes sending the signal to the
electronic speed control to accelerate the drive motor
to 850 rpm.
Within the middle of the second rinse phase (Regular
and Permanent Press only) is an Extra Rinse cycle.
The slow cam will try to enable the pump by closing
slow cam contact 7A. If the Extra Rinse switch is set
to the YES or ON position, the pump will turn on and
discharge the water for 50 seconds. The timer will
then fill the tub with water and resume agitation. If
the Extra Rinse switch is set to the NO or OFF
position, the timer will signal the electronic speed
control to gently tumble the clothes load by closing
slow cam contacts 9B and 24B.
At the end of the wash cycle the timer pause for 50
seconds to allow the spin tub to coast down to a
complete stop. During this time, the timer disables
all the electronic speed control code signals, and
releases the door lock thermal safety delay device
(PTC). At the end of 50 seconds, the timer will close
slow cam contact 4A energizing the cycle signal
buzzer for 3.3 seconds then advance into the Stop
position of the timer.
To Test the Timer
If the timer is suspected of faulty operation, check
the washer's timer cycle chart and electrical sche-
matic diagram.
1. Let the timer advance or index forward to the
portion of the cycle in question. Use the TIMER
DIAGNOSTIC AID located on page 26 or 44 to
assist in locating correct increment.
2. If a component controlled by the timer fails to
function as the timer advances through the
cycle, check for voltage at the timer terminal.
See the appropriate wiring diagram. If voltage is
supplied to the component, check the compo-
nent as described in this section.
3. Disconnect power to washer and check continu-
ity through timer contacts.
4. If the timer contacts fail to close in the sequence
shown in the timer chart, or are burned (have
resistance measurable with an ohmmeter),
replace the timer.
To Remove or Replace Timer:
1. Disconnect the washer from electrical supply.