HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 • Printed in USA
Revised August 1, 1996 P/N 340272A
4 - 27
Troubleshooting—Defrost Board with Fibertronic Time Clock
Be sure Branch Board Switch is Closed.
Refrigeration Mode
Test Result Action
1 From the Time Clock Branch Board System OK to Branch Board
force the Branch into Defrost Yellow LED Go to 5
Defrost Mode. (Refer lights
to Defrost Clock 1000 Manual)
Branch Board Consult Defrost Clock 1000 Manual
Defrost Yellow LED to test up to Q2 Input on the
does NOT light Branch Board - if OK, Go to 2
Branch Board Verify Clock Terminal and
Defrost Yellow LED Branch Board for match.
lights for a diff e r e n t Consult Defrost Clock 1000 M a n u a l
Branch Board for correction procedures
Voltmeter Voltmeter Action
Lead Placement Reading
2 T1 (X1) T11 (X2) 120 Go to 3
0 Check Power Supply to Board
3 P2,1 T11 (X2) 120 Go to 4
0 Check Fuse F1 (5Amp) - If OK,
Board Failure
4 P2,2 T11 (X2) 120 Go to 5
0 If Jumper J4 open, closed; if closed
Board Failure
5 T4 T11 (X2) 120 Go to 6
0 Board Failure
6 T5 T11 (X2) 120 End Test
0 Board Failure
For each remote component, determine its board terminals from the wiring diagram,
then use standard test procedures.
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