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Chapter 6 – Maintenance
Possible Cause
Spring is loose and
only making
intermittent contact
Installation Error
Unstable Vi be Input
Problem: Display Dark or Darkening
Contrast incorrectly
adjusted
The 12V power
short-circuited
Unit too hot
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Corrective Action
pinched wire, incorrectly installed batteries,
conductive debris, an external cable short, and
so on.
Battery contact PCB assembly springs must be
clean and tight. If looseness is a problem, the
eyelet that holds the spring must be re-pressed
or the assembly replaced.
Incoming pickup Signal is out of Range.
Ensure target tape "dwell" is long enough for
installation parameters.
If low speed RPM is OK but signal is lost as
speed is increased, make tape wider in beam or
photocell.
RPM fluctuations exceed unit screening.
Cable bad - replace/repair cable.
Nearby frequency competing with target
frequency check Spectrum for nearby peaks.
Wind causing unstable vibes. Move out of
variable wind areas like left side of hangars,
beams, etc.
Intermittent cable - fix cable
Bad sensor - replace sensor
Sensor loose in bracket
Adjust the contrast by using the two keys to
the right of the screen.
Remove any cables and try again. Inspect
connectors for visible damage.
If the unit has been exposed to heat (greater
13841 Rev A
240
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