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Possible Cause
Contrast incorrectly
adjusted
The 12V power
short-circuited
Batteries installed
incorrectly
Battery terminals in
the end plate
corroded and/or dirty
Battery power too
low
Keyboard ribbon
cable loose or offset
Internal short circuit,
battery wire pinched
Internal power
connectors offset or
damaged
One or both fuses
opened
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Chapter 6 – Maintenance
Corrective Action
Adjust the contrast by using the two keys to
the right of the screen. If the display turns
dark, but no text is visible during the
adjustment, see "Problem: Display Dark or
Darkening".
Remove any damaged cables and try again.
Inspect connectors for visible damage.
Remove the batteries and check the installation
polarity against the pictured instructions inside
the hand grips on the chassis.
If the terminals on the battery end plate PCB
are discolored or corroded, clean them with a
pencil eraser.
Install fresh batteries.
Remove the shield (see Section 6.3.7.2
"Disassembly") and check the ribbon cable
for looseness, position, and/or damage.
Remove the connector end plate and carefully
inspect internal wires for damage (see
Section 6.3.7.2 "Disassembly").
Check internal connectors for position,
looseness, and/or damage.
With an ohmmeter, check the resistance across
each fuse (one each on the two battery contact
PCB assemblies). Resistance must be less than
1. Replace any bad fuse (Ref. No. F1).
Continue to inspect the instrument for the
cause of fuse tripping. This cause could be a
13841 Rev A
239
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