150 Chadwick-Helmuth Company, Inc.
Chapter 6 - Maintenance
Internal short circuit Remove the connector end plate and carefully
inspect internal wires for damage (see
Section 6.3.7.2 “Disassembly” on page 143).
Problem: Display Too Light
Contrast incorrectly
adjusted
Adjust the contrast by using the two keys to the
right of the screen.
The -12V power
short-circuited
Remove any damaged cables and try again.
Inspect connectors for visible damage.
Unit too cold 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.
Problem: Unit Not Responding to Certain Keys
Keyboard connector
loose, offset, or
damaged
Adjust the contrast by using the two keys to the
right of the screen.
Keyboard failure Return the unit to the factory for repair.
Problem: Unit Repeatedly Turning Off Unexpectedly
Battery end plate
loose
Check the battery end plate for excessive
looseness; some play is normal. Adjust the
spring(s) on the battery contact PCB assembly,
or replace the battery end plate.
Battery voltage low Replace or recharge the batteries.
Terminals in battery
end plate PCB
corroded and/or dirty
If the terminals on the battery end plate PCB
are discolored or corroded, clean them with a
pencil eraser.
Possible Cause Corrective Action (Continued)
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