HP 8560A

ADC/lnterface Section
The ADC/Interface Section includes the AlAl Keyboard, AlA RPG (rotary pulse
generator), and A3 Interface assemblies.
Table 7-l lists signal versus pin numbers for control
cable W2.
Troubleshooting Using the TAM
......................................................
.7-4
Automatic Fault Isolation
...........................................................
..7- 4
Keyboard/RPG Problems
............................................................
..7- 7
Keyboard Interface
.................................................................
..7- 7
RPG Interface
.....................................................................
..7- 8
Triggering Problems
.................................................................
..7- 9
Flatness Control (RF Gain
DACs)
...................................................
.7-11
A3 Assembly’s Video Circuits
.......................................................
..7-12
Log Offset/Log Expand
.............................................................
7-14
Video MUX
.......................................................................
..7-15
Video Filter
.......................................................................
..7-15
Video Filter Buffer Amplifier
......................................................
..7-16
Positive/Negative Peak Detectors
...................................................
7-17
Peak Detector Reset
..............................................................
..7-18
Rosenfell Detector..................................................................
7-18
ADC MUX
.........................................................................
7-19
Variable Gain Amplifier (VGA)
.....................................................
7-21
Track and Hold
.....................................................................
7-21
A3 Assembly’s ADC Circuits
.......................................................
..7-22
ADC Control Signals
..............................................................
..7-22
ADC Start/Stop Control
...........................................................
.7-23
ADC ASM
.........................................................................
.7-24
ADC
...............................................................................
.7-24
Ramp Counter
....................................................................
..7-25
A3 Assembly’s Control Circuits
.....................................................
..7-26
Analog Bus Drivers
...............................................................
..7-26
Analog Bus Timing
...............................................................
..7-27
Interface Strobe Select
............................................................
..7-28
ADC/lnterface Section 7-1