5-1
COMPONENT TESTING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.
Refer to page 4-5 for the procedure for ac-
cessing the thermistor.
1. Unplug refrigerator or disconnect power.
2. Disconnect the thermistor connector from
the wiring harness.
3.
Set the ohmmeter to the R x 10 scale.
4. Touch the ohmmeter test leads to the
connector pins. The meter should indi-
cate as shown in the chart.
NOTE: If the resistance of the thermistor is
normal, perform the following voltage test.
5.
Set the voltmeter to read a maximum
voltage of 10 volts DC.
6.
Connect power to the refrigerator and al-
low it to enter the “cooling” mode.
THERMISTOR
Before testing any of the components, per-
form the following checks:
Control
failure can be the result of corro-
sion on connectors. Therefore, disconnect-
ing
and reconnecting wires will be neces-
sary throughout test procedures.
A
ll tests/checks should be made with a
VOM or DVM having a sensitivity of 20,000
ohms-per-volt DC, or greater.
•
•
C
heck all connections before replacing
components, looking for broken or loose
wires, failed terminals, or wires not pressed
into connectors far enough.
Resistance checks must be made with pow-
e
r cord unplugged from outlet, and with wir-
i
ng harness or connectors disconnected.
Unless stated otherwise, make all resis-
t
ance checks by disconnecting the compo-
n
ent connector at the Central Control Unit
(CCU).
•
•
•
TEMP RESISTANCE TEMP RESISTANCE
(°F) Ω (APPROX.) (°F) Ω (APPROX.)
–5 25900-27500 45 5930-6300
0 22100-23500 50 5190-5510
5 18900-20000 55 4550-4830
10 16200-17200 60 4000-4240
15 13900-14800 65 3520-3730
20 12000-12800 70 3100-3300
25 10400-1
1000 75 2740-2910
30 8990-9550 80 2430-2580
32 8750 85 2160-2290
35 7800-8290 90 1920-2030
40 6800-7220
7. With the thermistor disconnected and the
refrigerator in the cooling mode, touch
the voltmeter test leads to the thermistor
main harness connector pins. The me-
ter
should indicate approximately 5 volts
DC.
If the voltage is not present, check for
a thermistor output at the main control
board (see page 5-8).
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