IBM 6400 - Page 96

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Chapter 5 Troubleshooting Display Messages
124 PAPER FIFO
OVERFLOW
SEE USER’S GUIDE
Paper First In First
Out Overflow.
Firmware error on the
CMX controller board.
1. Cycle power. Run the print job again. If
the message appears, download the
emulation software again.
2. 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.
125 PAPER FIFO
UNDERFLOW
SEE USER’S GUIDE
Paper First In First
Out Underflow.
1. Cycle power. Run the print job again. If
the message appears, download the
emulation software again.
2. Run the print job again. If the message
appears, power off the printer. Remove
the paper guide assembly or pedestal top
cover. Make sure connectors P106 and
P107 are fully seated on the CMX
controller board.
3. Check hammer phasing. Try using a
lower phasing value; sometimes this
message indicates too high a hammer
phase value.
4. Power on the printer. Run the print job
again. If the message appears, power off
the printer. Make sure the MPU cable, the
hammer bank logic cable, and the
hammer bank power cable are
undamaged and have good connections.
Replace as necessary. (Refer to
Appendix A.)
5. Power on the printer. Run the print job
again. If the message appears, replace
the shuttle frame assembly.
6. Power on the printer. Run the print job
again. If the message appears, replace
the power supply board.
7. Power on the printer. Run the print job
again. If the message appears, replace
the CMX controller board. Record the
message and return it with defective CMX
board.
Table 4. Message List
Operator Panel
Message
Explanation Corrective Action