8114A Service Guide
Optocoupler
Check for a signal output at TP201,
TP204, and TP205 while
varying the output amplitude. In the state of rest (not varying the
output amplitude) there is
VFL present.
Amplifier
The specified output amplitude range is internally divided into 6
ranges. Eighteen hybrids are necessary to cover the amplitude range.
There are four hybrid groups, each controlled by a DAC. Different
hybrid groups are active or switched off
in
the amplitude ranges.
Following table shows in which amplitude range which output voltage
is
present at, which
5-11.
4.99 v
0.0 v
0.0 v
1.06 V
0.0 v
5.00 v
0.0 v
0.0 v
0.71 v
0.71 v
7.99 v
0.0 v
0.0 v
1.12 v
1.13 v
8.00 v
0.0 v
0.57 v
0.0 v
0.0 v
15.99 v
0.0 v
1.12 v
0.0 v
0.0 v
16.00 V
0.62 V
0.0 v
0.62 V
0.0 v
29.99 v
1.15 v
0.0 v
1.15 v
0.0 v
30.00 v
0.71 v
0.71 V
0.71 v
0.71 v
50.05 v
1.17 v
1.17 v
1.18 v
1.18 V
5.18 Troubleshooting
