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Chapter 3 Troubleshooting Display Messages
8.5V POWER FAIL *
8.5 Volt Power Failed.
Internal power failure.
1. Cycle power. If the message
appears, replace the power
supply board.
2. Power on the printer. If the
message appears, replace the
controller board. Record the
message and return it with
defective board.
3. Power on the printer. If the
message appears, replace the
shuttle frame assembly.
15 COMM CHECK
Communication Check: a
message that appears in the
CT emulation meaning the
line is not active on a twinax
interface.
1. Power off the printer. Check/
reseat the twinax host data cable
connection and 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 Appendix A. If
resistances are not correct,
replace the twinax auto-
termination cable.
3. Power on the printer. Send a print
job to the printer. Verify that all
other devices on the twinax line
are working properly. (Refer to
line problem determination
procedures, as recommended by
the host system.)
4. If the message is gone, the host
has reestablished communication
with the printer. If all other twinax
devices work properly and the
message still appears, replace
the expansion-CT board. Record
the message and return it with
defective board.
Table 2. Message List
Message Explanation Solution
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