HP 5501A Operating And Service Manual page 227

Table 6-2. Binary Controlled Counter Interface Electronics Systems Troubleshooting (Cont'd)
e) 10746 Binary lnterface card.
SYMPTOM POSSIBLE PROBLEM ACTION
Data LED does 1. User software Refer to Section
not light when IV for instruction
controller sends sequence.
command to trans-
fer data 2. 1/O cabling Verify proper
connections and no
shorting.
3. Controller mal- Run controller
function diagnostic
4. 10746 mal- Replace or trouble-
function shoot 10746.
f) Check I/O cabling from controller to coupler.
g) If all the reference or measurement LED indicators on 10760A counter cards do not light
when power is applied :
ACTION LOCATION RESULT SUBSEQUENT ACTION
Verify presence 10760A front- Signal If LED is extin-
of reference edge present guished, trouble-
and measure- shoot 10760A
ment signals
with oscillo- Measurement Signal Troubleshoot
scope. Signals Signal: Pins absent receiver or
are square 18,20 cabling.
waves
Reference : Signal If LED extinguished,
pins 22,24 present troubleshoot 10760A
Signal Troubleshoot laser
absent head or cabling.
PROBLEM EXISTS BUT NOT O N ALL AXES
2. If the system is multi-axis but the problem is not present on all axes, substitute known good
components to isolate the problem system component. The following may also apply:
I
a) Check user software (refer to Section IV for example program).
b) Check voltage on each coupler card.
LOCATION VOLTAGE
+5V Front-edge test point At least +5V
+
.0lV
on each card.