3M 900AST Series - Page 58

3M
™
Advanced Systems Tester 900AST Series
58
Repair
Many apparent failures with the 900AST tester can
be corrected by simple procedures.
Symptom Cause Solution
Unit does not turn on Discharged battery pack Replace batteries
Screen goes blank Battery voltage low Replace batteries
Dark lines across screen Battery voltage low Replace batteries
Error messages Battery voltage low Replace batteries
Inaccurate results Battery voltage low Replace batteries
No results
Test lead broken
Improper connections
Replace test lead
See on-screen hookups
Resistance <999 MOhm
with test leads open
Test leads dirty Clean test leads
Error messages during
Self-Calibration
Test leads not shorted
properly when prompted
Test leads broken
Check connections
Check test leads
If the above solutions do not fix the problem, the
900AST tester may need repair.
Please make a note of the conditions when the
failure occurred and record any error messages that
may have appeared on the screen, then call 3M
Repair Service at 800-426-8688 and select option
2 (in the US or Canada), or call your local 3M
representative in other countries for further details
on repair service.