HP 8753D Option 011 Service Manual page 211

Source Group Troubleshooting ppendix
Troubleshooting Source Problems with the Analog Bus
The analog bus can perform a variety of fast checks. However, it too is subject to failure
and thus should be tested prior to use. You should have done this in Chapter 4, \Start
Troubleshooting Here."
To use the analog bus to check any one of the nodes, press
. Then press
ANALOG BU IN
analog bus node number followed by 2
Menus and Error Messages," for additional information.
Phase Lock Diagnostic Tools
error messages
diagnostic routines
Phase Lock Error Messages
ll phase lock error messages can result from improper front panel connections.
NO IF FOUND: CHECK R INPUT LEVEL
problem. Perform the \ 4 Sampler/Mixer Check."
NO PHA E LOCK: CHECK R INPUT LEVEL
source problem. Perform the \ 4 Sampler/Mixer Check," earlier in this chapter.
PHA E LOCK CAL FAILED
source or receiver failure. Perform the \Source Pretune Correction Constants" routine as
outlined in Chapter 3, \ djustments and Correction Constants." If the analyzer fails that
routine, perform the
\ 4 Sampler/Mixer Check."
means that phase lock was lost or interrupted before the band sweep
PHA E LOCK LO T
ended: a source problem. Refer to \Phase Lock Diagnostic Routines" next to access the
phase lock loop diagnostic service routine. Then troubleshoot the problem by following the
procedures in this chapter.
Phase Lock iagnostic Routines
Perform the following steps to determine at what frequencies and bands the phase lock
problem occurs.
1. Press
RESET SYSTEM
5
automatic phase-locked loop. Normally, when the phase-locked loop detects lock problems,
it automatically aborts the sweep and attempts to recalibrate the pretune cycle. Switching
o PLL UTO defeats this routine.
2. Press to switch on the phase-locked loop diagnostic service mode. In this
PLL DIAG ON
mode, the phase lock cycle and subsweep number are displayed on the analyzer display.
(See \Service Modes Menu" in Chapter 10, \Service Key Menus and Error Messages," for
more information.)
7-34 Source Troubleshooting
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PARAMETER
MEAS
5
. Refer to \ nalog Bus" in Chapter 10, \Service Key
1
5
means no IF was detected during pretune: a source
means the IF was not acquired after pretune: a
means that a calculation of pretune values was not successful: a
ERVICE MENU ERVICE MODE
5
RESET SYSTEM
5 5
ANALOG IN Aux Input
to switch o the
PLL AUTO OFF
ERVICE MENU
and enter the
RAFT
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