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Possible Cause
EPROM chip loose
or damaged
Keyboard ribbon
cable loose or offset
Internal short circuit
Problem: Display Too Light
Contrast incorrectly
adjusted
The -12V power
short-circuited
Unit too cold
Problem: Unit Not Responding to Certain Keys
Keyboard connector
loose, offset, or
damaged
Keyboard failure
Problem: Unit Repeatedly Turning Off Unexpectedly
Battery end plate
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Chapter 6 – Maintenance
Corrective Action
than 130° F) the display may not be able to be
adjusted brightly enough to read. Remove the
unit from heat.
Remove the shield (see Section 6.3.7.2
"Disassembly") and check the EPROM chip
for looseness, position, and/or damage. The
main PCB may have to be removed for
closer inspection.
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").
Adjust the contrast by using the two keys to
the right of the screen.
Remove any damaged cables and try again.
Inspect connectors for visible damage.
If the unit has been exposed to low
temperatures (less than 0° F), the display may
not be able to be adjusted dark enough to read.
Move the unit to a warmer place.
Adjust the contrast by using the two keys to
the right of the screen.
Return the unit to the factory for repair.
Check the battery end plate for excessive
13841 Rev A
241
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