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Troubleshooting procedure
Table 4-3
summarizes scanner card troubleshooting steps. Refer to the schematic diagram
and component layout drawings at the end of
Section 5
for component locations.
WARNING
Lethal voltages are present within the Model 2000. Some of the procedures
may expose you to hazardous voltages. Observe standard safety precautions
for dealing with live circuits. Failure to do so could result in personal injury
or death.
CAUTION
Use care when removing relays from the PC board to avoid pulling traces
away from the circuit board. Before attempting to remove a relay, use an
appropriate de-soldering tool, such as a solder sucker, to clear each mounting
hole completely free of solder. Each relay pin must be free to move in its
mounting hole before removal. Also, make certain that no burrs are present
on the ends of the relay pins.
NOTE
To avoid contamination, which could degrade card performance, always handle the
card only by the side edges and covers. Do not touch edge connectors, board surfaces,
or components on the card. Also, do not touch areas adjacent to electrical contacts
on connectors.
Table 4-3
Troubleshooting procedure
Step
Item/component
Required condition
Comments
1
2
3
4
5
6
Digital ground P1034,
pin 1, 3, 5
P1034, pin 9
U101, pin 2
U101, pin 3
U101, pin 7
U101-U103, pins 10-18
+5VDC
CLOCK pulses
DATA pulses
STROBE pulse
Low when relay state
is changed.
All voltages referenced to digital
ground.
Card power supply voltage.
Serial clock pulses.
Serial data pulses.
End of relay update sequence.
High when relay is not changing
state. Relay driver outputs.
4-14
Service Information
Summary of Contents for 2000-Scan
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Page 13: ...1 General Information General Information ...
Page 17: ...2 CardConnections andInstallation CardConnec tionsandInstal lation ...
Page 35: ...3 Operation Operation ...
Page 58: ...3 24 Operation Section 3 Page 24 Tuesday July 8 2003 2 30 PM ...
Page 59: ...4 Service Information Service Information ...
Page 73: ...5 Replaceable Parts Replaceable Parts ...
Page 76: ...5 4 Replaceable Parts ...
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