GE WSXH208T, Technical Service Manual, Page: 23 / 51

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of reduction gears and a crank and pawl assembly.
The fast cam controls the reversing tumble action of
the drum by reversing the polarity of the DC voltage
to the drive motor. It also signals the electronic
speed control through codes that the polarity is
changing and the electronic speed control should
stop the drive motor, allow the timer to change
polarity, then resume motor rotation. The slow cam
controls the timing and functions of the other compo-
nents within the washer system (i.e. pump, water
valves, etc.).
The timer also interfaces with the dispenser system
and defines when to dispense detergents, bleaches,
and fabric softeners. The shaft has a cross shaped
feature that mates with a matching feature on the
dispenser cam. The dispenser cam profile is de-
signed to match the program set within the timer.
Timer Operation During Wash Mode
The timer has four wash cycles that may be chosen
(Pre-Wash, Regular Wash, Permanent Press, and
Knits and Delicates). Only the Regular wash has two
different starting points, the first provides for a longer
wash for heavier soiled clothes and the second for
normally soiled clothes.
If the timer dial is set to the start of Pre-Wash,
Permanent Press, Knits and Delicates, or the second
start position of Regular Wash, the timer will wait for
the water level pressure switch to be satisfied before
agitating the clothes load. Only in the first starting
position of the Regular Wash cycle will the timer
allow the clothes to tumble while the water is filling
the tub.
To understand the timing sequence of the fast cam
during agitation, let's look at an example of what
happens during a Regular wash cycle beginning at
the second starting position. The slow cam sets up
the water temperature switch to provide hot, warm or
cold wash water by closing contacts 6A and 8B, it
provides part of the agitation code (code A) to the
electronic speed control by closing contact 9A, and it
sets up the to operate on the long field winding by
closing contact 13A.
The fast cam rotates one full revolution every 200
seconds (3.33 minutes). Every 16.67 seconds the
cam opens fast cam contact 24B for 3.33 seconds.
This interrupts the agitation signal code (code D) to
the electronic speed control. The electronic speed
control then turns off the drive motor. During this
OFF time, fast cam contact 21 will switch from 21A
to 21B and contact 23 will switch from 23A to 23B to
reverse the polarity of the DC motor voltage to the
drive motor. At the end of the 3.33 second time
period, fast cam contact 24B closes, returning the
5. Pull hinge arm out of slot in front panel and remove
hinge.
6. Reverse procedure to reassemble.
DOOR SAFETY SWITCH ASSEMBLY (Door Lock)
To Remove or Replace Door Safety Switch:
1. Disconnect washer from electrical supply.
2. Remove top panel.
3. Pull loose right side of bellows from front to access
switch assembly.
4. If necessary, to provide enough slack to gain
access to switch assembly, remove timer wiring
harness wire ties from their anchoring points (3)
inside front corner of cabinet. Wire ties are most
easily released by using a small 7/32" box end
wrench. Press the wrench over the expandable part
of the wire tie to compress, and while compressed,
pull to remove. It may be helpful to remove lower
service panel for better access also.
5. Remove switch assembly mounting screws and
remove wires from switch, solenoid, and PTC.
6. Reverse procedure to reassemble.
TIMER
The timer interfaces with the electronic speed control
unit and the drive motor, and performs the following
functions:
1. Provides AC power to the electronic speed control
unit.
2. Reverses the direction of the DC drive motor, by
reversing the polarity on the motor brushes.
3. Controls the entire timing sequence during the
cycle selected.
TIMER OPERATION
The timer works with the electronic speed control in a
"Master / Slave" type relationship. The timer (or
master) tells the electronic speed control what to do
and when to do it, and the electronic speed control
controls the motor speed functions such as ramp-up
and speed monitoring.
The timer is an interval timer like previous timers but
the step times can be various lengths (i.e. 3.3, 50,
100, 146.7, 150, etc.) versus fixed. This allows the
timer to be more flexible. The entire agitation portion
of the wash cycle can be contained in one step and
not spread over many steps.
The timer contains two sets of cams that drive
switches, and four cams that are used to count time.
The cams are driven by the timer motor through a set