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Chapter 3 Troubleshooting Display Messages
ACCESS NULL PTR*
Access Null Pointer: The
processor tried to access a
pointer that contains nothing
(null).
1. Cycle power. Run the print job
again. If the message appears,
download the emulation software
again (page 150).
2. Cycle power. Run the print job
again. If the message appears,
replace the controller board.
Record the message and return it
with defective board.
ACTIVATE LOST
The printer detects a twinax
protocol communication
error and reports the error.
1. Power off the printer. Disconnect
the AC power cord from the
printer. 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 112.
A TO D OVERRUN*
Analog to Digital Overrun.
The analog-to-digital
converter overflowed.
Cycle power. Run the print job again.
If the message appears, replace the
controller board. Record the message
and return it with defective board.
Table 2. Message List
Message Explanation Solution
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