Troubleshooting When Ll Inputs Look Bad; Run Internal Tests 18 And 17; Check 2Nd Lo - HP 8753D Option 011 Service Manual

Figure GOOD8 here.

Troubleshooting When ll Inputs Look Bad

Run Internal Tests 18 and 17

1. Press
PRESET SYSTE
5
o set.
2. Then, when the analyzer nishes test 18, press
linearity test.
If either of these tests F IL, the 10 assembly is probably faulty. This can be con rmed by
checking the 4 MHz signal and substituting the 10 assembly or checking the signals listed in
Table 8-1.

Check 2nd LO

Check the 2nd LO signal. Refer to the \ 12 Reference Check" section of Chapter 7, \Source
Troubleshooting" for analog bus and oscilloscope checks of the 2nd LO and waveform
illustrations.
If the analyzer passes the checks, continue to \Check the 4 MHz REF Signal."
If the analyzer fails the checks, perform the high/low band transition adjustment. If the
adjustment fails, or brings no improvement, replace 12.
8-4 Receiver Troubleshooting
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Figure 8-2. Typical Good Trace
SERVI E MENU TESTS
5
18 1
EXE UTE TEST
5 5
17 1
EXE UTE TEST
5 5
to run the DC
to run the DC
RAFT
3/21/106 15:13