Burst Counter
Test the burst counter circuits using the following procedure:
1 . Set up the HP 81 12A up as follows:
PER
1 µs
Mode
E.BURST
DTY
503
BUR
1024
2. Switch off the HP 81 12A
3. Desolder wire W3 on the control board A2 and resolder it to the
"test" position. This pulls BURST
ON
low via R105.
4. Connect Al U201 pin 10 to ground.
5. Switch on the HP 81 12A and check that error number E52 is
displayed.
6. Press
7. Press the
button
8. Check the TTL logic levels at the burst acceptors UlOO and UlOl
as follows:
Table 1 0.6·2.
Signal
Pin
Level
BNl UlOO Pin 2
L
BN2
U lOO Pin 5
L
BN3 UlOO Pin 6
L
BN4 U lOO Pin 9
L
BN5 UlOO Pin 12
L
BN6 UlOO Pin 15
L
BN7 UlOO Pin 16
L
BN8
U lOO Pin 19
L
BN9
UlOl Pin 2
L
BNlO UlOl Pin 5
L
B N l l UlOl Pin 6
9.
Using an oscilloscope and ECL- and TTL-logic probes you
can test the burst- counter waveform and timing data against
Figure 10.6-3.
1 0.6-6 Servicing the Burst Control Circuit
Summary of Contents for 8112A
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