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TESTING THE ELECTRONIC
CONTROLS
To test the electronic control, turn the
unit on and allow it to proceed to the
point of failure. Follow the control panel
disassembly instructions, as previously
detailed, to access the electronic control
for testing. Leave the wiring harness
plugged into the rear board connector.
A voltmeter can now be used at the rear
of the wiring harness plug, in combina-
tion with the washer schematic, to con-
firm proper circuitry through the elec-
tronic control.
EXAMPLE
To test the electronic control on a unit
that will not fill with hot water the
_
'
initial step will be to place the volt-
meter leads between wire terminal
#2 and wire terminal #4. If the cir-
cuit is closed, there is nothing wrong
with the electronic control.
If the circuit is not closed, leads placed
between wire terminal #1 and wire termi-
nal #2 (L 1) should verify a closed circuit
and confirm power to the electronic
control.
After verification, leads placed between
wire terminal #1 and wire terminal #14
(hot valve) should also show a closed
circuit if the electronic control is function-
ing properly.
NOTE:
Terminal identification at the
rear of the wiring harness plug is made
easier by using the three
(3)
flat sided
terminal holes for orientation.
IMPORTANT - - - - - - - - - - ,
Because of the complexity of the
electronic control package, no
attempt should be made to service
it in the field. Instead, should an
electronic control be
diagnosed
as
malfunctioning,
replace the Control
Shield and Electronic Assembly as
a unit.
WATER LEVEL SWITCH
The water level switch on the Electronic
Control Washer is snap locked to the
control shield, beside the speaker assem-
bly.
The water level switch is operated by a
column of air that becomes trapped in the
pressure switch hose. This hose is con-
nected between the diaphragm section of
the switch and the air bell, which is lo-
cated on the lower portion of the tub. As
water enters the tub, a small amount
enters the pressure switch hose trapping
air in the hose. As the water level in-
creases in the tub, the column of air
becomes compressed and exerts pres-
sure on the water level switch diaphragm.
When the proper water level is reached,
the diaphragm actuates single pole,
double throw switches in the water level
switch assembly.
The water level switch is quite sensitive
and requires very little air pressure to
activate it at the maximum fill position.
Therefore, it is most important that the
hose connections to the switch dia-
phragm and air bell nipple be airtight, as
the smallest air leak will cause erratic
operation.
16007667
SECTION 10. ELECTRONIC CONTROL MODEL
10-9
©1996 Maytag Corporation
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