M
AVTMTTR25 Rev C April 2008
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Troubleshooting
The Troubleshooting Guide, Table 5-1, is arranged to help you evaluate the
reasons for TTR25 test set malfunction. The table lists possible TTR25 test set
malfunctions which may be encountered during operation and lists possible
causes. Electronic circuit repairs should not be attempted in the field. Refer to
Repair section. Refer to Appendix B for a list of spare parts.
Table 5-1 Troubleshooting Guide
MALFUNCTION POSSIBLE CAUSE
Display stays blank after POWER
switch is turned on.
Battery is discharged.
Contrast potentiometer not adjusted.
Defective display or electronics.
Any error message on the screens See ERROR MESSAGES section
Test results erratic
Defective test leads (open circuit, poor connection).
Problem in test specimen (poor connection).
Problem in TTR25 measuring circuit.
Incorrect connection of leads.
Incorrect marking of a transformer.
Defective transformer.
Can not obtain printout when printer is
connected.
Printer power not turned on.
Printer battery discharged.
Problem in TTR25 printer interface electronics.
Printer cable is defective or is a null-modem cable.
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