Mastertech 3100 Operator’s Manual Page B-1
B. IF YOU ARE HAVING A
PROBLEM
If you have a problem using the Mastertech and the program card, first select SELF TEST from the
program card SETUP MENU and perform all of the Self Tests.
This section is intended to help you get back on track if the Mastertech appears to be operating abnormally.
Examples of most of the displays which you might see under abnormal conditions are shown. In addition, the
most likely cause for the condition is given as well as other possible causes and recommendations on how to
isolate or eliminate the problem. If your problem is not isolated or eliminated by using these instructions, see
WARRANTY AND REPAIR INFORMATION in the Introduction section.
BLANK SCREEN WHEN TESTER IS TURNED ON
Most Likely Cause
• Display contrast misadjusted.
• NiCad batteries dead and tester is not receiving power from vehicle.
• Fuse in cigarette lighter plug is blown.
Recommendations
• Adjust tester contrast control.
• Charge NiCad batteries.
• Inspect the tester DC power cable and plug.
• Replace fuse in cigarette lighter plug (see 5: SYMPTOM).
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