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