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TYPICAL TESTING PROCEDURES
Electromechanical Defrost Timer
The Defrost Timer Motor and Switch can be tested in Electromechanical Defrost Timers.
To Test the Timer Switch:
1. Disconnect the wiring harness plug from the defrost timer.
2. Rotate the timer cam until you hear a click. (This puts it in the defrost cycle.)
3. Set a volt-ohm meter on Rx1 scale.
4. Place the probes of a VOM on the terminals 1 and 2. The VOM should read continuity.
5. Rotate the timer cam until it clicks a second time. (Just a few degrees back to the cooling
cycle.)
6. Place the probes of a VOM on the 1 and 4 terminals. The VOM should read continuity.
To Test the Timer Motor:
1. Set volt-ohm meter on Rx10K scale.
2. Place the probes of a VOM on the 2 and 3 terminals.
a) On Mallory timers, the VOM should read between 6K and 9K ohms.
b) (Set volt-ohm meter to highest setting) On Paragon timers, the VOM should momen-
tarily deflect and then show infinity. NOTE: Paragon timers have a capacitor in series
with the timer motor. These must be checked like a capacitor.
1
2
4
3
80
Testing Timer
Motor and
Switch
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