HP 5501A Operating And Service Manual page 232

Table 6-2. Binary Controlled Counter Interface Electronics Systems Troubleshooting (Cont'd)
CHECKOUT PROCEDURE
I
REQUIRED TEST EQUIPMENT
INSTRUMENT TYPE REQUIRED CHARACTERISTICS
Digital Voltmeter
Range: -15V to +15V
+
.01V dc
Logic Probe TTL Level
Oscilloscope
Ability to display signals between
dc and 20 MHz
Individual Circuit Card
Operating and Service
Manuals
MULTI-AXIS PROBLEM
1 . I f same problem exists on all axes, check the following possible error sources
a) Check temperature in the coupler environment.
COUPLER TEMPERATURE SYMPTOMS ACTION
O0 to 40°C None
-
Electronics None
should operate a s
described
Out of range Counters may jump or Ventilate
count erratically enclosure
b) Check voltage on each coupler card.
LOCATION VOLTAGE
+5V Front-edge test point At least +5V
2
.01V on
each card.
C)
Check user software (Refer to Section IV for example Comparator Program.)
d)
Check instruction sequence timing (Refer to 10746 manual.)
e) 10746A Binary lnterface Card
I
I
SYMPTOM
Data LED does not
light when con-
troller sends com-
mand to transfer
data
In normal operation,
Data LED i s dimly
lit (If sampling
continuously.)
POSSIBLE PROBLEM
I
ACTION
1. User software
2. 1/O Cabling
Refer to Section IV
for instruction
sequence.
Verify proper
connections and no
shorting.
3. Controller
malfunction
Run controller
diagnostic.
4. 10746A Mal- Replace or Trouble-
function. shoot 10746A.