HP 8562E, Руководство по обслуживанию

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A3 Assembly Control Circuits
A digital control problem will cause the following three steps to fail.
1. On the spectrum analyzer, press 7, 0, and
2. A click should be heard after pressing in step 1, unless was previously set to
70
3. Press 1, 0, and Another click should be heard. If no clicks were heard, but the
value displayed on the CRT changed, the digital control signals are not operating
properly.
Refer to function block N of A3 Interface Assembly Schematic Diagram in the
HP 8560 E-Series Spectrum Analyzer Component Level Information.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Press on the spectrum analyzer, and set the controls as follows:
Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Single
Monitor pin 3 (LRF-STB) with an oscilloscope or logic probe. This is the
for the Al5 RF Assembly.
strobe
Press and PANEL and check that pulses occur when toggling between
MHz and EXT.
Monitor pin 5 with an oscilloscope or logic probe. This is the strobe for
the Al4 frequency control assembly.
Press and check that pulses occur when toggling between settings of
10 and 20
Monitor pin 7 (LIF-STB) with an oscilloscope or logic probe. This is the strobe for
the A5 IF assembly.
Press and check that pulses occur when toggling between REF LVL settings of
-10 and -20
Monitor pin 9 (LLOG-STB) with an oscilloscope or logic probe. This is the strobe
for the log amplifier on the A4 assembly.
Press and check that pulses occur when toggling between and
To check the Address and Data Lines, place a jumper from and to
pin 20 V).
Check that address lines through A7 and data lines DO through D7 are all TTL high.
If any address or data line is low, press (LINE) to turn spectrum analyzer off and disconnect
the W2 control cable from
Press (LINE) to turn spectrum analyzer on. Ignore any
error messages.
8-28 Section