5
b
t
4-1
INTRODUCTION
Section
IV
SECTION
IV
SYSTEM
TROUBLESHOOTING
4-2 This section contains
a
diagnostic procedure
for determining the faulty instrument in the 3721A/
3720A System when
a
system failure occurs.
Before troubleshooting the System, check that the
3721A is functioning correctly by carrying out the
Performance Check given in Section Ill of the
3721A Service Manual. Although covering most
faults likely to occur in practice, the System
troubleshooting procedure
is
not intended
as
an
infallible method for every possible trouble. For
faults not covered here please contact your nearest
Hewlett-Packard Service Office. Addresses are given
at
the back of this manual.
4-3
USING TROUBLESHOOTING SECTION
4-4 Paragraph 4-12 gives the settings for the
controls on the 3721A and 3720A required before
starting to troubleshoot the System. Except where
indicated in the appropriate Flow, these settings
should be maintained throughout the troubleshoot-
ing procedure.
4-5 When there
is
a
fault in the System and the
problem area is unknown, start
at
Flow A and work
through to Flow D to isolate the faulty instrument.
When the problem area is known refer to the
appropriate Flow. Table 4-1
lists
the Flow charts.
Table 4-1
Flow
charts
Flow
Problem Area
A Control faults
B
Display Sensitivity faults
C
Data Transfer faults
D Other Transferred Signals faults
NOTE:
When there
is
a
fault in the System and
it
occurs
only
when displaying Modulus, Log Mod
and/or Phase, then the fault
is
in the 3720A.
4-6 When carrying out System troubleshooting
the rear panel connector wiring details are available
for reference in Section
V
of this manual.
4-7 Once the fault has been localised to one of
the instruments refer to Table 4-2 for the approp-
riate action to be taken.
Table 4-2 3721 A/3720A
System
repair procedure
Faulty
Instrument
Action
3721A Correlator
1554914 Interface Accessory
(Assembly and Cable)
3720A Spectrum Display
Refer to 3721A Service Manual
Refer to 15549A Operating and Service Manual
Return 3720A to your nearest Hewlett-Packard Service
Office for repair
4-
1
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