Maintenance
TROUBLESHOOTING
Table
6-17.
Circuitry
Tested
by
the
Analog
Self-Tests
CIRCUITRY
TESTED
EST
NUMBER
1
2
3 4 5
6
7 8
9
10 11
12
13 14 15
16
17 18
19
20
21
DC:
K3O 1
TIH:
Amplifier
I
OHMS:
I
Protection
AC:
...
U802
U803
0.0
If a problem occurs in the keyboard/display area, the
Finally,
as
in most processor-based systems, there are
instrument may appear to
be
totally inoperative even when
communication links between the various parts of the
the measurement circuitry is still functional. The heading
system. Specifically, in the
8840A,
there is
a
bus interface
Digital Controller Troubleshooting provides detailed
between analog and digital control circuits and a guard-
instructions on locating problems in the displaykeyboard
crossing interface between logic circuits which may
be
system.
separated by large potentials. Failures in these links can
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