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The following hints should help you to identify possible malfunctioning and/or incorrect operation of CMXs. They cannot
be considered as exhaustive of all and any operating conditions you may encounter.
1.
baud rate set to different values on CPU board and IC-2
Action: verify IC-2 jumpers and CPU dip switch settings
2.
the line transient suppressor has been blown out
Action: verify the line suppressor integrity
3.
CMX board line driver faulty
Action: send the board to CDI for verification and maintenance
4.
the fuse is blown out
Action: send the board to CDI for verification and maintenance
5.
Power supply is low - the BT LED (see Figs. 4.1, 5.1 and 6.1) is ON and the board is stuck
Action: verify supply voltage
1.
line is faulty
Action: verify line integrity
2.
Power supply is low - the BT LED (see Figs. 4.1, 5.1 and 6.1) is ON
Action: verify supply voltage
1.
the line is interrupted
Action: verify the line integrity
2.
at least one of the CMXs has the line driver electrically shorted
Action: send the board to CDI for verification and maintenance
1.
Power supply voltage absent or too low
Action: verify power supply voltage
2.
The voltage polarity is inverted
Action: verify the polarity and exchange the poles as necessary
3.
the fuse is blown out
Action: send the board to CDI for verification and maintenance
1.
the I/O LED is permanently OFF
Action: the optoisolator can be damaged. Send the board to CDI for verification and maintenance
E1110A.DOC
11 Troubleshooting
The CMX does not communicate with Supervising center
Irregular or faulty communication
Line fault
The board doesn't turn on
The Inputs/Outputs don't operate properly
Data and design subject to change without notice. Supply subject to availability
© Copyright by CERBERUS AG, CH-8708 Männedorf, Switzerland 1995
TROUBLESHOOTING
01.96
45[51]
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