MOD E L 3562A
SERV I C E
8-8 A4 LOCAL OSCILLATOR
The information in this section should be used to isolate fau lty subblocks i n the A4 Local
Oscillator (LO). All proced u res assume the Fau lt I solation procedures of Section VI I have
been used to determ ine which board has fai led, and the circuit descriptions of Section
VI are u nderstood.
WARNING
Service procedures described in this section are performed with
the protective covers removed and power applied. Hazardous
voltage and energy available at many points can, if contacted, result
in personal injury.
CA UTION
Do not insert or remo ve an y c ircuit board in the H P 3562A with
the line power turned on. Power transients caused by insertion or
removal may damage the circuit boards.
How to Use This Section
Star't
Reh�rence
Verify
Aft��r-Repair
The pri mary troubleshooting method for the LO assem bly is to use
the self-tests to determine which subblocks and possible com ponents
are failing. Signature analysis is then used to troubleshoot the individual
subblocks suspected of fai l ing. Start troubleshooting by using part A,
" Local Oscillator Diagnostics".
For the component locator and schematic refer to Section IX. For the
location of cables and boards refer to figure 4-1 in Section IV.
Use the oscil loscope waveforms in tab le A4-5 to see correct operation
at various test poi nts in the assembly.
Use table A4-6 to determ ine which adjustments and tests need to be
done to com plete instrument service.
Troubleshooting Hints
1 . I f the LO fu nctional tests pass, but the 'Output Sine Check' (7-8, part E ) fa ils, start
troubleshooting with the LO Output Buffer (U54). This output buffer is not tested by
the self-tests.
8-43
Summary of Contents for 3562A
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Page 305: ...c c I O Sequencer S r J Sequence Decoder ...
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