MOD E L 3562A
S E RVICE
8-11 3 A9, FAST FOURIER TRANSFORM (FFTJ PROCESSOR
The information in this section should be used to isolate fau lty subblocks on the FFT board.
A l l proced u res assume that you have used the fau lt isolation proced u res in Section V I I
to determ ine that this board has failed and that you have read and understand the circuit
descriptions in Section V I .
WARNING
Service procedures described in this section are performed with
protective covers removed and power applied. Hazardous voltages
in these circuits can ca use personal injury if contacted.
CA UTION
Do not insert or remo ve any circuit board in the HP 3562A while
power is on. Power transients caused by insertion or removal may
cause damage to circu its on the board being changed or on other
boards.
How to use this section
Start
Procedure
Reference
Aft.er-Repai r
To troubleshoot the FFT board, use the FFT diagnostic tests to further
isolate the prob lem. Circuit descriptions in Section VI p rovide the
backgrou nd for u nderstand ing how the FFT board circu its work.
Once the problem has been local ized to a block of c i rcu its, one of
the three digital signatu re analysis (DSA) tests shou ld be used to
troubleshoot individual circu its. Waveforms are provided in table A9-7
to demonstrate the correct appearance of the DSA clock and start/stop
signals.
Refer to Section IX for the component locator and schematic. Refer
to figure 4-1 in Section IV for the location of cables and boards.
Use table A9-8 to determ ine which adjustments and tests need to be
done to complete instru ment service.
TfClubleshooting Hints
1 . The FFT status L E Ds shou ld be O FF d u ring normal operation. They are not used to
service the board.
2. A major portion of the FFT process is add ressing. Be s u re you u nderstand which parts
of the circuit are part of the add ressing block. Refer to the b lock d iagrams in the circu it
descriptions in Section V I .
8-1 05
Содержание 3562A
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Страница 149: ...IODEL 3562A R1 0 A22 Board Location Key Figure 3 1 7 Analog source component locator A30R 1 0 ADJUSTMENTS 3 21 3 22 ...
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Страница 213: ...r A1 a pQWERSuP PLY I 03562 66518 REV A REV 8 8MPOUT 58 58 FRONT REAR P ANEL ii O N ...
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Страница 305: ...c c I O Sequencer S r J Sequence Decoder ...
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Страница 425: ...L_ FAULT ISOLATION Instrument Operational Figure 7 1 3 SELF TEST Sequence MODEL 3562A STOP Enter failure in r t be 7 61 ...
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