TROUBLESHOOTING
E1110A.DOC
Data and design subject to change without notice. Supply subject to availability
© Copyright by CERBERUS AG, CH-8708 Männedorf, Switzerland 1995
01.96
45[51]
11 Troubleshooting
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.
The CMX does not communicate with Supervising center
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
Irregular or faulty communication
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
Line fault
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
The board doesn't turn on
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
The Inputs/Outputs don't operate properly
1.
the I/O LED is permanently OFF
Action:
the optoisolator can be damaged. Send the board to CDI for verification and maintenance
