If the plug-in
a
the CH 2 LED is flashed
times to display a fault code. Each time
2 LED turns on, count
If
CH LED is lit during a
the
2 LED, then the
to the current count accumulated is
which
Refer to
riming diagram in Figure 3-8 for an
LED fault code.
timing diagram illustrates
number 2
OFF
Figure
Sample LED fault code timing diagram.
The
Tests are:
1. ROM Checksum Test
2.
Non-volatile RAM
3.
1.
The ROM Checksum Test
checksum of
of
firm-
ware ROM. This
checksum is then
with a checksum
stored in the ROM. If
checksums do not
fails, and
code is
code is
by
the
the plug-in attempts to
normal operation,
is unlikely that
can function
with a had ROM Checksum.
2.
The non-volatile RAM (NV RAM)
verifies that the NV
is
Since
NV RAM contains calibration information which
undamaged, this test
not alter
data.
If
a failure, then
plug-in reports fault code of 2,
loops
NV RAM Test. The instrument
looping the NV
RAM
until
power is
Until the condition causing
NV
RAM Test to fail is corrected,
mainframe
not
plug-in.
The NV RAM
could
calibration data
in
NV RAM if
is cycled or removed during this test.
corruption occurs,
the
Calconstant Checksum is
as well.
at the
up, the plug-in resets the calibration constants to
ROM
and
reports a plug-in
checksum
during
Power-up
the mainframe/plug-in
is
through
Enhanced Accuracy cycle, the plug-in is
calibrated.
Maintenance-
Service Reference
Summary of Contents for 11A32
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