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Chapter 4 Troubleshooting Display Messages
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 CMX
controller board. Record the message and
return it with defective CMX board.
BUFFER OVERRUN The print buffer has overflowed
on a serial interface. The
printed output may contain
random * (asterisk) characters.
Make a configuration printout.
1. Verify that the printer matches the
host serial interface configuration
settings for Data Protocol, Baud
Rate, Data Bits, Stop Bits, Parity,
Data Terminal Ready, and Request
to Send. Set printer serial interface
parameters to match those of the
host.
2. Send a print job to the printer. If the
message appears, go to
Communications Failures, page
83.
CLEAR PAPER JAM Paper jam.
1. Inspect the paper path for jams.
Clear jams. Load paper.
2. Press PAPER ADVANCE several
times and check that forms feed
without erratic motion, noise, or pin-
hole damage. If forms do not feed, go
to Paper feeds poorly, page 77.
If forms feed, go to step 3.
3. Press VIEW once and check that
forms move up. Make sure the forms
thickness lever is not set too tightly.
4. Press VIEW again and check that the
forms thickness lever rotates and the
paper moves down. If the forms
thickness lever does not rotate and/or
the paper does not move down, refer
to Reverse paper feed: platen does
not open, page 79.
5. Check the paper tension between the
tractors. Adjust the right tractor so
that it does not pull paper too tightly
or leave it too loose. The right tractor
should hold the paper under “slight”
tension.
6. Inspect the ribbon mask for bends or
deformation. Replace if damaged.
7. Check anddjust the platen open belt.
Replace the belt if it is damaged.
Table 2. Message List
Message Explanation Solution
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