Troubleshooting guide

Central
Control Unit
(CCU)
The Central
Control Unit is located at
the top
rear
of the
washer
and is
enclosed in a control box.
(Fig.
2-1 1) There
are
no
serviceable
parts
inside
the control box.
lf
diagnostic tests
indicate
any component of the
CCU
is
defective, the entire
control
box
must
be
replaced.
The
CCU receives input lrom
the touchpad/LED assembly
and directly
controls the dispenser, drain
pump,
water inlet
valves,
door
locking
and unlocking solenoids,
and
heating
element relay. The
CCU
monitors
the
pressure
switch,
flow-
meter,
temperature sensor and
door
lock
switches.
The
CCU sends the customer
selection
input
to the
Motor
Control Unit for
proper
motor operation.
Motor
Gontrol Unit
(MCU)
The Motor
Control Unit is located is inside
a
plastic
control
box located in
the
lower front
corner of the washer cabinet.
(Fig.
2-12) The control box is shown with
the access
door
open.
The MCU
operates the drive motor
at
varying
speeds
and
direction based on inputs received
by the CCU to complete
the cycle selected. The MCU also monitors
a tachomeler
on the motor
to confirm that the drive motor is
operating
at
the
proper
speed and direction.
Drive Motor
The
drive motor is a three-phase
asynchronous
induction
type
that operates at
various
speeds and direction based on
input
voltages and frequencies. A
tachometer on the
motor
shaft sends
a
feedback
signal to the
Motor
Control Unit
indi-
cating the rotation
speed and direction.
Fig.
2-11
Fig.2-12
Fig.2-13
2-7