
The Procedures
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Reseat the twinax host data cable connection and the twinax I/O
cable connection at the expansion-CT board.
2. Disconnect the twinax auto-termination cable from the printer or from the
last device on this twinax port. Test the cable for the resistances shown in
the Main Wire Harness Test Tables in Appendix A.
If resistances are not correct, replace the twinax auto-termination
cable.
3. Connect the power cord to the printer. Power on the printer. Send a print
job to the printer.
If the message appears, replace the twinax cable.
4. Send a print job to the printer.
If the message appears, go to Communications Failures, page 88.
INVALID COMMAND Message
1. The printer detects a twinax protocol communications error and reports
the error. Power off the printer. Disconnect the AC power cord from the
printer. Check the twinax host data cable and twinax I/O cable connection
at the expansion-CT board.
Reseat the twinax host data cable connection and the twinax I/O
cable connection at the expansion-CT board.
2. Disconnect the twinax auto-termination cable from the printer. Test the
cable for the resistances shown in the Main Wire Harness Test Tables in
Appendix A.
If resistances are not correct, replace the twinax auto-termination
cable.
3. Connect the power cord to the printer. Power on the printer. Send a print
job to the printer.
If the message appears, replace the twinax cable.
4. Send a print job to the printer.
If the message appears, go to Communications Failures, page 88.
LO DRV. SHORT* Message
1. Lower Driver Short. Circuit(s) on the hammer bank or in the hammer bank
power cable are shorted to ground.
Cycle power. If the message appears, press CLEAR. If message
does not clear, replace the hammer bank logic cable and the hammer
bank power cable.
2. Power on the printer.
If the message appears, replace the shuttle frame assembly.
3. Power on the printer.
If the message appears, replace the CMX controller board. Record
the message and return it with defective CMX board.
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