Background Tests And Diagnostic Messages; Table 7-3 Background Tests - Honeywell UDC3500 Product Manual

7.5

Background Tests and Diagnostic Messages

Introduction
This instrument performs ongoing background tests to verify data and memory integrity.
If there is a malfunction, a diagnostic message will be displayed (blinking) in the lower
display.
In the case of simultaneous malfunctions, the messages will appear in sequence in the
lower display. Table 7-3 lists these background tests in order by their priority, the reason
for their failure, and how to correct the problem.
Diagnostic messages may be suppressed (stop the blinking) by pressing the RUN/HOLD
key. The messages will still be available for viewing by pressing the LOWER DISPLAY
key. If the underlying condition has not been corrected, then the next time the instrument
is powered-down/powered-up, the diagnostic message will return.
Lower
Display
RAM test failed at start up.
RAM ERR
Calibration test failed at start up.
CAL ERR
EE FAIL Unable to write to non-volatile
memory. Anytime you change a
parameter and it is not accepted, you
will see EE FAIL.
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Table 7-3 Background Tests

Reason for Failure
UDC3500 Universal Digital Controller Product Manual
How to Correct the Problem
1) Run through STATUS check to determine
the reason for the failure.
2) Run through the STATUS check a second
time to see if the error cleared.
3) Power cycle the instrument. If the message
reappears, replace the instrument.
1) Run through STATUS check to determine
the reason for the failure.
2) Restore factory settings. (See Section 7.7).
3) Power cycle the instrument. If the message
reappears, replace the instrument.
1) Check the accuracy of the parameter and re-
enter.
2) Try to change something else in
configuration.
3) Run through Read STATUS tests to re-write
to EEPROM.
4) Run through the STATUS check a second
time to see if the error cleared. If error did
not clear, then power cycle the instrument. If
the message reappears, replace the
instrument.
Troubleshooting/Service
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