HP 5501A Operating And Service Manual page 229

Table 6-2. Binarv Controlled Counter Interface Electronics Systems Troubleshooting (Cont'd)
DATA ERRORS
3.
lncorrect display or printout results when the measurement optics are displaced a known distance
SYMPTOM CAUSE ACTION
No movement in- Coupler interface
1. Replace or trouble-
dicated on all card not placing shoot 10746, or
measurement axes instructions on I/O from coupler
coupler backplane to controller.
System mal- 10760A counter 1. Using logic probe,
functions in ex- fails to receive verify 10760A is re-
tended reso- extended reso- ceiving extended reso-
lution. (e.g., lution command or
lution command (U47 (9)
laser readings resolution cir- on 10760 should be a
are 6 or 10
cuitry i s mal- TTL high if in extended
times greater functioning. Can resolution).
or less than also be software
known measured error. 2. If command not
distance)
received, check proper
command decoder output
on 10760 with logic
probe.
3. Replace interface
card.
4. If command received
verify 10760A is cor-
rectly jumpered for
desired resolution.
5. Replace 10760A
card.
Correct position 1 . Incorrect See Section V for
data
i s
output grounding. grounding considerations.
but in the wrong
format.
(i.e. least sig- 2. Incorrect I/O Check I/O cabling.
nificant data cabling.
sent in the first
data word transmitted.
No movement in- 10760A malfunction If possible, sub-
dicated on one stitute 10760A from
but not all axes. other axis.