Sears C110,753900 Service Information
T:F. 26
-
#27
l,lovember
14, 1985
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Depa,rtment
731.A
Tbronto
TECHNICAL
FLASH
SEtrVICE
INFOF]MATION
@AOO
DUSHWASHER
Dd@DE&
z'5-9900,
DEPARTT.IENI 731A _ ISRRY
STDES
KENMORE DISHWASHER
MODEL
753900
DELAY
WASH
TIMER
Model
753900
has
an
eight hour delay
timer
that
is mounted in
the console. See
Figure
1.
This delay
wash timer will delay the
start
of a
selected
dishwasher
cycle
up to
eight hours.
A single-throw
double-pole
switch in the
delay timer controls the start
of
the
dishwasher
cycle. See
Figure
2
for
the
location
of
the delay
timer contacts
in
the
wiring diagram.
When the
DELAY WASH
feature
is
selected, contacts
T
to
W-G
are closed. lf the DELAY
WASH
fea-
ture
is not
selected,
the T
to
W-O contacts
are
closed and the
dishwasher will
start the selected
cycle
immediately.
The
dishwasher uses a Rapid
Advance
Timer.
RAPID
ADVANCE
TIMER
Model
753900
is
equipped
with
a
Rapid
Advance
Timer.
This
timer does
not have a dial
or
knob. There
are actually two
timer
motors.
One
is a standard-speed
motor that
rotates
the
timer
one
full
revolution
in
68
minutes,
while
the
other
motor turns
rapidly.
The
Rapid Advance
motor
simply
serves
to ad-
vance
the
timer cams
to a
predetermined
star'
ting
position.
This starting
position
is
program-
med
through
the
pushbutton
selector
switch
and
various
contacts
in the
timer itself
for
any
given
cycle selection.
This action
is
similar
to a standard
timer
being
manually
advanced
to a SHORT
CYCLE
by the
user
for cycle selection.
The table
in
figure
3
shows
how
the
timer is ad-
vanced through
the cycle
for
any
given
cycle
selection.
Once
the timer
has
advanced
to the
predetermi-
ned
starting
position,
the
electrical circuit
is bro-
ken to the
Rapid
Advance
timer
motor by one
of the timer switches
and
one
of the selector
switches.
The
Rapid
Advance
motor stops
and
the
normal timer
motor takes
over
to
complete
the
selected
cycle.
The timer
is
mounted behind
the access
panel
of the
dishwasher.
To
gain
access
to
the Rapid
Advance
Timer, the
access
panel
must be
removed.
The
timer starts
all cycles,
except the
MlNl
WASH and
ECONO cycle,
at
increment
1
of the
timer.
The
POTS &
PANS
and
NORMAL
WASH cycle
go
through
all
cycles
for
a
complete
360
rotati'
on.
The
RINSE &
HOLD cycle
goes
through
the
first
wash and
rinse
cycles
only. The
RINSE
&
HOLD
cycle
finishes in
increment
14
of
the
timer.
The
Rapid Advance
Motor advances
the
timer
to the
drain cycle
in
increment
39.
When
the
drain cycle
is completed,
the
timer
advances
to the OFF
position.
\
Fifure
2
Figure
1
1
s.F. 26
-
#27
c
CYCLE
SELECTION
POTS
&
PANS
RINSE HOLD
NORMAL
MINI WASH
ECONO
WASH
CANCEL/DRAIN
|
|
Timer
advanced
by clock motor
-l
Timeradvanced
by
R.A.
motor
REMEMBER:
There
is
no
push/pull
switch.
Also, since there
is no
timer
shaft
for
a dial and
knob,
a
square
hole has
been
provided
in
the
cam
shaft to
use for rotating
the
timer through
its
cycles manually.
The
timer cycles are
printed
on
the timer
(Fig.4l
and
there
is a raised
step
on
the
cam shaft that is
a
pointer
to indicate
where
the timer is in
the
cycle.
SOUARE
HOIE
Legend:
Figure 4
WA - Wetting
Agent Dispenser
DD
-
Detergent
Dispenser
TH - Thermostatic Hold
F Fill Valve
D
Drain
-
#27
To
advance the
timer
manually,
place
a screwdri-
ver
in
the
square
hole
and
turn
it
clockwise to
the
desired
position.
PUSH
TO START
SWITCH
The momentary Push
to Start
Switch
is used
to
start the
cycle after a
pushbutton
selection has
been
made.
A circuit is
completed through
the
door
switch
contacts
BK to T-BK
and
timer
contacts
WP to
GY-P to the Rapid
Advance Timer Motor.(Fig.5)
The
timer
will automatically
advance to the
se-
lected
cycle.
L-
'
E-'-1--2|
'--_
-)
o,,
Figure 3
o:
o.of\
-
-.\l-i/
t
I
I
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f
,l
#]
2
CYCLE SEOUENCE
tutt
ct0cttYrst
H
o
T.F. 26
Figure
5
DOOR SWITCH
The door switch
is
a SingleThrow
Double-Pole
sruitch.
With the
door closed, contact
is made between
BK
and T-BK
providing
a current
path
to the
ti-
mer
and
Push to Start Switch.
(Fig.
6)
Figure
6
At
the
end of the cycle
(increment
67
on the
timer sequence
chart) when the
door is opened,
a
circuit
is
completed
through contacts BK
to R
to the
Rapid
Advance
Motor.
The
Rapid Advance
Motor
advances
the
timer
to
increment 68
(OFF).
This
will
turn the Clean
Light
OFF.
(Fig.7)
Figure
7
The Clean Light
is energized
through
timer
con-
tacts T-BK to R-BK
and
Pushbutton
Switch con-
tacts R-BK
to GY-G.
Timer contacts T-BK
to R-BK are
closed
in
increment 67
only.
(Refer
to
timer sequence
chaft).
Note:
The
Clean Light
remains
"ON"
until the
door is opened.
r.F. 26
-
#27
INDICATOR
LIGHTS
DELAY LIGHT
The
Delay Light
is
ON
when
the delay
timer
op-
tion is selected. The
light remains
on
until the
dishwasher
starts
in
the
selected
cycle.
The
Delay light
is energized through
delay timer
switch contacts
T-WG.
See
Figure
2.
WASH LIGHT
The Wash Light
is
ON
during
the wash
cycles un-
til the
last wash-drain, timer increment
27.
The
Wash
Light
is ener(
'zed
through
timer
switch 32.
RINSE LIGHT
The
Rinse Light
is
ON
during the
2
final
rinses,
timer increments 29
-
40.
The Rinse Light
is
energized through
timer switch 23.
DRY LIGHT
The
Dry
Light
is
ON
during the HEATED dry
cycle, but
will
NOT
be
on if
the
Econo Air Dry
option is
selected.
When
this
selection
is made,
pushbutton
contact B is closed and when timer
switch 24 closes
in increment 41, it energizes the
Rapid Advance
Timer
Motor to advance the
ti-
mer to the
Clean
Light
position
in
increment
65.
CLEAN
LIGHT
The Clean Light
comes
ON
in timer increment
65.
The
light is
energized
through
timer contacts
T
-
R-BK
and
pushbutton
switch
contact Z.
When
refering
to
the
pushbutton
selector switch
chart
you
will
note that
contact
Z is
closed
when
the
following
cycles are selected:
Mini Wash,
Econo Wash,
Normal Wash and
Pots
and
Pans.
The Clean
Light
will NOT be
on when
the
Rinse
Hold
cycle
is selected.
The Clean
Light
remains
on until the dishwasher
door
is opened. With the
door open, door switch
contacts
BK
-
R are closed. A circuit
is
comple-
ted
through timer
contacts
R
-
GY-P
(reset
clean
light)
to
the
Rapid
Advance
motor,
which ad-
vances
the
timer to
increment
68
(Off
Position),
opening
the circuit to th€ clean
ligtlt.See
Fig. 7.
3
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