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Table 5-6
Troubleshooting procedure
Step
Item/component
1
Ground
(P2001, pins 3, 4, 15, 16)
2
K100-K178 even-numbered
relays, pins 1 and 2
3
U104, pin 8
4
U104, pin 5
5
U104, pin 6
6
U100, pin 7
7
U100, pin 2
8
U100, pin 3
9
U100-U103, U105,
pins 10-18
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Required condition
+6VDC
+5VDC
IDCLK pulses
IDDATA pulses
STROBE pulse
CLK pulses
DATA pulses
Low with relay energized; high
with relay de-energized.
Service Information
Comments
All voltages referenced to digital ground.
Relay voltage.
Logic voltage.
During power-up only.
During power-up only.
End of relay update sequence.
During relay update sequence only.
During relay update sequence only.
Relay driver outputs.
5-17
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