4-16
NOTE
Observe the soldering and cleaning pre-
cautions discussed in paragraph 4.2.2
when making board modifications. Circuit
board contamination may degrade card
performance.
Table 4-3
Troubleshooting procedure
Step
Item/component
Required condition
Comments
1
Digital ground P1034, pin 1, 3, 5
All voltages referenced to digital
ground.
2
P1034, pin 9
+5VDC
Card power supply voltage.
3
U101, pin 2
CLOCK pulses
Serial clock pulses.
4
U101, pin 3
DATA pulses
Serial data pulses.
5
U101, pin 7
STROBE pulse
End of relay update sequence.
6
U101-U103, pins 10-18
Low when relay state is changed. High
when relay is not changing state.
Relay driver outputs.
7
U105, pin 2
+54.63mV @ 0
°
C, or +59.23mV
@ +23
°
C
Reference junction output (see para-
graph 4.3.4).
Figure 4-10
Current-limiting resistor locations
HI LO
CH 2
OUT A OUT B
HI LO
CH 3
HI LO
CH 4
HI LO
CH 5
HI LO
CH 6
HI LO
CH 7
HI LO
CH 8
HI LO
CH 9
HI LO
CH 10
HI LO HI LO
Channel 5
Current-limiting
Resistors
Channel 10
Current-limiting
Resistors
unsolder the current-limiting resistors, then solder jumpers
wires in their places. Jumper part number J-3 may be ordered
directly from Keithley Instruments, Inc.
Содержание 2001-TCSCAN
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