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Service Information
Table 4-3
Troubleshooting procedure
Step
Item/component
1
Digital ground P1034, pin 1, 3, 5
2
P1034, pin 9
3
U102, pin 2
4
U102, pin 3
5
U102, pin 7
6
U102-U104, pins 10-18
4-10
Required
condition
Comments
All voltages referenced to digital ground.
+5VDC
Card power supply voltage.
CLK pulses
During relay update sequence only.
DATA pulses
During relay update sequence only.
STR pulse
End of relay update sequence.
Low with relay
Relay driver outputs. Low with relay energized,
high with relay de-energized.
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