Fairbanks H90-5200-A Digital Instrument - Manual (Page 37)

SECTION 4:
TROUBLESHOOTING
A. Troubleshooting
Use Appendix XII for viewing error codes. Should a problem occur, first unplug the
H90-5200-A indicator. Wait a few seconds then repower while observing display. If
problem is not resolved, call your local Fairbanks Service representative.
1. Perform a power-up test. Upon instrument power-up the H90-5200-A will
perform the following tests:
a. RAM Test - The RAM test verifies the operation of the processors external
memory device.
b. Display Test - The display will perform a warm-up sequence. This routine is
designed to test that all display segment lines, digit lines, and annunciator
LEDs, have no defects. This is a passive test and the user must observe the
display throughout the test to check for any anomalies.
c. EEPROM Read -The processor will attempt to retrieve the stored scale
programming data from the EEPROM. This data includes: deadload and span
counts, grad size, capacity, security level, etc.
If the processor detects any out-of-range data, it will repeatedly request data from the
EEPROM until the retrieved data is deemed valid. During this period, the display will
flash “EE Err.”
Very often the problem is with the data itself and not the actual hardware. The two
most common causes are as follows:
1) . A replacement board has just be installed in the instrument and this is a
first-time power-up. Thus, the current EEPROM data might not be
appropriate for the software in use.
2) . You are using a new (or different) software program or revision level than
used at the previous instrument power down. This result is that the new
software might be trying to access data from the wrong areas of memory.
50515 37 Issue #2 4/04