Service Information
6-18
Troubleshooting procedure
Table 6-6 summarizes multiplexer-digital I/O card trouble-
shooting.
Table 6-6
Troubleshooting procedure
Step
Item/component
Required condition
Comments
1
GND pad
All voltages referenced to digital ground
(GND pad).
2
Q100, pin 2
+6VDC
Relay voltage.
3
U101, pin 16
+5VDC
Logic voltage.
4
R135
+15VDC
Relay bias voltage.
5
Q100, pin 3
+3.5VDC*
Regulated relay voltage.
6
U110, pin 6
IDCLK pulses
During power-up only.
7
U110, pin 5
IDDATA pulses
During power-up only.
8
U106, pin 7
STROBE pulse
End of relay update sequence.
9
U106, pin 2
CLK pulses
During relay update sequence only.
10
U106, pin 3
DATA pulses
During relay update sequence only.
11
U105-U109, pins 10-18
Low with relay energized; high
with relay de-energized.
Relay driver outputs.
*+3.5VDC present at +V pad under steady-state conditions. This voltage rises to +5.7VDC for about 100msec when relay configuration is changed.
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