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WARNING
POWER IS ALWAYS PRESENT AT THE POWER SWITCH AND TRANS-
FORMER, AND DC VOLTAGE IS PRESENT WHENEVER THE POWER
CABLE IS CONNECTED TO THE AC POWER LINES. THE POWER
CORD MUST BE DISCONNECTED FROM THE INSTRUMENT TO
REMOVE ALL POWER FROM THE INSTRUMENT.
8-6. Capacitors inside the instrument may still be charged even if the instrument has been disconnected from
its power source.
8-7. CIRCUIT DESCRIPTIONS
8-8. The circuit descriptions of the HP 5334B Counter are divided according to functional blocks. The descrip-
tion of each block is presented in two parts. First, an overall explanation is given of the particular section
(Theory of Operation, paragraphs 8-70 through 8-101). And, second, a more detailed component-level descrip-
tion is provided (Detailed Theory of Operation, paragraphs 8-102 through 8-279).
8-9. TROUBLESHOOTING
8-1 0. General
8-11. Troubleshooting for the HP 5334B is designed to help the service technician find the component causing
the instrument to to fail. To accomplish this, two types of troubleshooting methods are used: (1) Signal Tracing,
and (2) Signature Analysis.
8-12. Signal Tracing
8-13. This type of troubleshooting employs the traditional methods of using a voltmeter and oscilloscope to
measure signal amplitude and observe waveforms. The bulk of the troubleshooting information provided here
uses signal tracing.
8-1 4. Signature Analysis
8-15. Signature Analysis is a simple method of verlfylng the operation of digital circuitry. When properly used,
signature analysis can detect extremely subtle hardware faults. Signatures must identically match those given in
the Signature Analysis section which follows Signal Tracing. If everything is working correctly, signatures will all
match exactly. If they do not match, by even one digit, something is wrong.
8-16. With the Counter's internal signature analysis routine, the signature analyzer's test probe is used to check
nodes in the circuit under test. The signature analyzer converts the signals at the node into a four digit "signa-
ture", which it displays: The signature is then compared to the corresponding one from the printed list of signa-
tures. These two signatures must be identical.
8-17. Signature analysis can be performed more efficiently if the following considerations are kept in mind:
a. Make sure that every step is performed as described in the setup procedure. That is, make sure that
the clock, start, and stop connections and triggering are correct.
b. Double check that the signatures are being taken at the correct node.
c. Make sure that the signature analyzer probe is making good contact with the pin being checked.
Oxidation on pins can cause invalid signatures due to poor contacts.
HP
5334B
-
Service Manual
8-2
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Table of Contents
Troubleshooting
