HP 8562E, Service Manual

Page: 304 / 482

11. Monitor pin 7 with an oscilloscope or logic probe. This is the strobe
for the A5 IF assembly.
12.
Press and check that pulses occur when toggling between LVL settings of
-10 and -20
13. Monitor pin 9 with an oscilloscope or logic probe. This is the
strobe for the A4 log amplifier/Cal oscillator assembly.
Press and check that pulses occur when toggling between and
Refer to function block K of A3 Interface Assembly Schematic Diagram in the
HP 8560 E-Series Spectrum Analyzer Component Level Information.
Interface strobe select generates the various strobes used by circuits on the A3 Interface
Assembly. Table 8-10 and Table 8-11 are the truth tables for demultiplexers
and
Table Demultiple Truth Table
Selected Output Line IA1
Pin 15, LSCAN-KBD
L
Pin 14, H
Pin 13, L
Pin 12,
H
Pin 11, L
Pin 10
H
Pin 9, LTIMER
L
Pin 7,
H
Table 1. Demultiple
Selected Output Line
Pin 15, LSENSE-KBD
L
Pin 14, LINT-PRIOR
H
Pin 13, LADC-DATA1
L
Pin 12, LDAC-DATA0 H
Pin 11, HCNTR-LDO
L
Pin 10, H
Pin 9, L
Pin 7, LADC-REGO H
IA2 IA3
L L
L L
H L
H L
L H
L H
H H
H H
:er Truth Table
IA1 IA2
L L
L L
H L
H L
L H
L H
H H
H
H
8-30 Section