Printronix P7000 Series Maintenance Manual page 90

Chapter 3
Troubleshooting Display Messages
Table 4. P7000 ASCII (Spool) Error Messages List
Displayed Message
INVALID COMMAND
LO DRV. SHORT*
90
Explanation
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 CT board.
Lower Driver Short.
Circuit(s) on the hammer
bank or in the hammer bank
power cable are shorted to
ground.
Solution
1. Reseat the twinax host data cable
connection and the twinax I/O
cable connection at the 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 209.
1. 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
controller board. Record the
message and return it with the
defective board.