Troubleshooting When All Inputs Look Bad - Agilent Technologies 8753ES Option 011 Service Manual

Troubleshooting When All Inputs Look Bad

Run Internal Tests 18 and 17
1. Press
Preset System
run the ADC offset.
2. Then, when the analyzer finishes test 18, press
ADC linearity test.
If either of these tests FAIL, the A10 assembly is probably faulty. This can be confirmed by
checking the 4 MHz signal and substituting the A10 assembly or checking the signals
listed in Table 8-1 on page
Check 2nd LO
Check the 2nd LO signal. Refer to
oscilloscope checks of the 2nd LO and waveform illustrations.
• If the analyzer passes the checks, continue to
• If the analyzer fails the checks, perform the
page 3-45. If the adjustment fails, or brings no improvement, replace A12.
Chapter 8
SERVICE MENU
8-9.
"A12 Reference Check" on page 7-12
"High/Low Band Transition Adjustment" on
Troubleshooting When All Inputs Look Bad
TESTS EXECUTE TEST
18 x1
EXECUTE TEST
17 x1
"Check the 4 MHz REF Signal,"
Receiver Troubleshooting
to
to run the
for analog bus and
next.
8-7