HP 8562E, Руководство по обслуживанию

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13. Check that address lines through A7 and data lines DO through D7 are all high. If
all address and data lines are high, suspect a fault either in W2 or one of the other four
assemblies which connect to W2.
14. If any address or data line is low, check the appropriate input of either (data lines)
or (address lines).
15. If a data line input is stuck low, check the data bus buffer. If an address line input is
stuck low, check and the A2 controller assembly.
16. If the appropriate input is high or toggling between high and low, suspect a failure in
either (data lines) or (address lines).
17. Remove jumpers.
Refer to function block P of A3 Interface Assembly Schematic Diagram in the
HP 8560 E-Series Spectrum
Analyzer Component
Level Information.
Analog bus timing (ABT) generates the strobes for the A4, A5, A14, and Al5 assemblies.
The Al4 frequency control assembly also requires a qualifier for its strobe, LVFC-ENABLE.
and provide a 2 delay between the time HANA-BUS goes high and the
enable line to demultiplexer goes low.
1. Press on the spectrum analyzer and set the controls as follows:
Center frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...300 MHz
Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2. Check that pin 1 goes low approximately 2 after pin 3)
goes high.
3. If is absent, check for pulses on ABT pin 2 and IA10
pin 5).
4. If pin 1 is not delayed 2 from HANA-BUS, check for the presence of the
1 MHz HBADC-CLKO.
5. If pin 1 is not delayed 2 from HANA-BUS and HBADC-CLKO is correct,
suspect a fault in either or
6. Press and set the controls as follows:
Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
..SINGL E
7. Monitor pin 3 (LR-STB) with an oscilloscope or logic probe. This is the strobe
for the Al5 RF assembly.
8. Press and PANEL and check that pulses occur when toggling between
and EXT.
9. Monitor pin 5 (LF-STB) with an oscilloscope or logic probe. This is the strobe
for the Al4 frequency control assembly.
10. Press [AMPLITUDE) and check that pulses occur when toggling between settings of
10 and 20
Section 8-29