Check The R, , And B Inputs - HP 8753D Option 011 Service Manual

Check the R, , and B inputs

Good inputs produce traces similar to Figure 8-2 in terms of atness. To examine each input
trace, do the following:
1. Connect the equipment as shown in Figure 8-1. (The thru cable is HP part number
8120-4781.)
Figure SETUP8 here.
2. Check the atness of the input R trace by comparing it with the trace in Figure 8-2.
ote The R trace will be 20 dB lower than the and B trace due to the attenuator
on the R input. The atness of the trace, however, should resemble that of the
and B input traces.
Press
PRESET EAS
5 5
3. Check the atness of the input trace by comparing it with the trace in Figure 8-2.
Press .
EAS
A
5
4. Check the atness of the input B trace by comparing it with the trace in Figure 8-2.
Move the input cable to the B input and press
If none of the input traces resembles Figure 8-2, continue with \Troubleshooting When
ll Inputs Look Bad."
If at least one input trace resembles Figure 8-2, continue with \Troubleshooting When
One or More Inputs Look Good."
RAFT
3/21/106 15:13
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Figure 8-1. Equipment Setup
SCALE REF
R AUTO S ALE
5
.
.
B
Receiver Troubleshooting 8-3