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Possible Cause
a short circuit
Problem: EPROM Checksum Error
EPROM chip loose
(13590-2 only)
EPROM failure
Conductive debris
loose in unit
Problem: Memory Bad Error
Internal short circuit
Problem: Unit Not Retaining Memory/Date/Time
Memory retention
capacitor failing
Problem: No Vibration Signal
Wrong channel
selected
Cable damaged
Connector damaged
Internal connections
loose or damaged
Sensor bad
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Chapter 6 – Maintenance
Corrective Action
Remove the shield (see Section 6.3.7.2
"Disassembly") and check the EPROM (the
large socketed chip) for looseness, position,
and/or damage. The main PCB may have to
be removed for closer inspection.
Replace the EPROM or return it to the factory
for repair.
Internally inspect the unit for loose debris, for
example, a screw.
Inspect the unit for loose internal debris.
Return the unit to the factory for repair.
Check to make sure the sensor cable is
connected to the correct channel.
Inspect the cable for damage, short circuits,
bent pins, and/or opens.
Inspect connectors for damage and/or bent
pins.
Remove the connector end plate (see
Section 6.3.7.2 "Disassembly"). Inspect the
unit for loose connectors, pinched and/or
broken wires.
Check the sensor with the Model 11 Calibrator
or return the sensor to the factory for
13841 Rev A
243
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