Roper TOP-MOUNT REFRIGERATOR Specifications download pdf (Page 86)

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.

TYPICAL TESTING PROCEDURES

1 2

Testing Timer

Motor and

Switch

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Roper TOP-MOUNT REFRIGERATOR Specifications Page 86