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September 1, 1997
Table 4-4 — Troubleshooting—Defrost Board with Mechanical Time Clock
Voltmeter
Lead Placement
Lead 1
T1 (X1)
1
2
P2,1
3
P2,2
Voltmeter
Lead Placement
Lead 1
1
T1 (X1)
2
P2,1
3
P2,2
T4
4
5
T5
For each remote component, determine its board terminals from the wiring diagram,
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Be sure Board Switch is closed.
Refrigeration Mode
Voltmeter
Reading
Lead 2
T11 (X2)
120
0
T11 (X2)
120
0
T11 (X2)
0
120
Defrost Mode
Voltmeter
Reading
Lead 2
T11 (X2)
120
0
T11 (X2)
120
0
T11 (X2)
120
0
T11 (X2)
120
0
T11 (X2)
120
0
then use standard test procedures.
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Action
Go to 2
Check Power Supply to Board
Go to 3
Check Fuse F1 (5 Amp) – If OK, Board
Failure
End Test
Defrost timer contacts closed – Correct
and reset system
Action
Go to 2
Check Power Supply to Board
Go to 3
Check Fuse F1 (5 Amp) – If OK, Board
Failure
Go to 4
Defrost timer circuit open – Check and
correct
Go to 5
Board Failure
End Test
Board Failure
P/N 401789
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