HP 5501A Operating And Service Manual page 240

Table 6-4. English/Metric Pulse Output Electronics System Troubleshooting (Cont'd)
MULTI-AXIS PROBLEM
1. If same problem exists on all axes, check the following possible error sources:
a) System does not work (control LED'S on the10763A's should bedimly lit when system iscycling).
SYMPTOM CAUSE ACTION
Upon sending 1. "Start" circuitry 1. Check wiring of
"start" pulse malfunction switch to send
system does not "start" pulse.
start.
Must send a
2. Control not passed
2. Check switch and
start pulse! between 10763A jumper settings
cards (apparent by on 1076314 card.
control LED lit o n (Should corres-
only "master" card.) pond to table
5-2, Section V.)
3. Large deadpath 3. Check OPC line
will result in long on backplane
initialization (see Table 4-1,
cycle (>20 seconds). Section IV),
Each 1076314 must using TTL Logic
initialize its own Probe. This line
axis before
it
should be cycling
passes control to high and low.
another 10763A.
4. If OPC is cycling
properly, prob-
lem is probably a
defective 10763A.
5. If OPC is not
cycling properly,
problem can be a
defective 10760A.
Overflow error 10760A counters trying Switch normal/
is flagged after to count i n wrong reverse jumper on
moving the op- direction (negatively) 10760A card.
tics
a
short
distance in the
positive direction.
Laser not pro- 1. System not 1. Disconnect con-
viding feedback starting (see troller and hook
information to the previous page). up freq. counter.
controller. (See Table 6-4a, 6-4b)
2. Controller not
(Indicated by recognizing output 2. Jumper 10763 for
the controller pulses from elec- testing (See
not appearing to tronics. table 6-4c).
receive data from
the laser elec- 3. Look at output
tronics.) pulse count.
(See test a).