GSE Scale Systems - 271
Chapter 29 Troubleshooting Technical Reference Manual
SECTION - 29.12
the calibration data for the A/D should be transferred
from the unit which the A/D was taken into the unit
where the A/D now resides.
Alternatively the A/D calibration procedure may be
performed on the unit with the replacement A/D
converter.
In order to transfer the A/D calibration data from one
unit to another, simply write down the values shown on
the display for parameters P61110 through P61122 on
the unit that the A/D was taken.
If it is desired that the unit that received the replacement
A/D maintain its calibration to a scale base, then next
write down the values displayed at P61105 and P61107
on that unit.
Next enter the P61110 - P61122 values recorded from
the scavenged 574 into the 574 being repaired.
Finally, again if the scale base calibration is to be
maintained, re-enter the values previously recorded for
parameters P61105 and P61107.
The parameters listed above are for scale #1setup.
29.12 Trouble-Shooting
DATA TRANSMISSION: If a data transmission
of any weight-related numeric data such as Gross, Net or
Tare, is sent as dashes, an overload or underload
(negative overload) condition was in effect. Remove the
cause of the overload (or underload) and repeat the
transmission. Check also the setup of parameters P204
and P209.
DISPLAYED WEIGHT: If an overload or underload
occurs due to an electrical overstress (EOS) normally due
to lightning or ESD discharge, then press the
<CLR> key. The message "wait 1" will appear for about
1 second. The A/D converter will then be reset and the
system should again be functional. If not, power down
for a few seconds. If the unit still does not work properly
after power-up, check the load cell or platform wiring. If
okay, permanent damage may have occurred, most likely
at U1, the A/D converter. The instrument amplifier is
built into the same chip with the A/D, this portion of the
device could be faulty.
Component Layout: Refer to Figure 45 Main Board
PC746B Component Layout.
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