Rockwell Automation 2755-DM9, -DM9E High Speed Decoder - Manual (Page 134)

Chapter 9
Maintenance and Troubleshooting
9–4
Refer to Table 9.A for troubleshooting. It is impossible to list every possible
malfunction. If a problem occurs that is not listed in the troubleshooting
table, refer the problem to your A–B service representative.
Problem Probable Cause(s) Corrective Action(s)
Decoder POWER indicator does not
light and scan head does not operate. Decoder is not turned on.
No incoming power.
Improper connection to power
source.
Input power fuse is blown.
Faulty power cord.
Turn decoder on.
Verify power source.
Check connections.
Replace input power fuse.
Replace power cord.
Scan head PWR ON indicator does
not light. Decoder POWER indicator
is lit. Cable connection between
scan head and decoder is
loose.
Defective cable between
scan head and decoder.
Defective scan head.
Check cable connections.
Replace cable.
Refer to scan head user’s manual.
No communication between decoder
and programming terminal. Communication parameters of
programming terminal and
decoder do not match.
Incorrect CRT type selected
on CRT type select screen .
Incorrect CRT setup.
Improperly connected cable.
Improperly fabricated cable.
Check that baud rate, parity, and number of
stop bits match.
Review section of this manual on the CRT
select screen and select your type of terminal.
Verify setup using Appendix A.
Check cable connections.
Verify setup using Appendix A.
No communication between decoder
and a host device. Host/Decoder communication
parameters do not match.
Improperly connected cable.
Improperly fabricated cable.
Check setup screen #1 and verify that correct
communication parameters are set. If
incorrect, change parameters, SAVE
configuration, and reset the decoder.
Check connections.
Verify connections using Chapter 6.
Troubleshooting