Keithley 7037, Instruction Manual

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Service Information
6-14
Troubleshooting procedure
Table 6-4 summarizes relay-digital I/O card troubleshooting.
Table 6-4
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 configurat on is changed.