IBM 6400 series Maintenance Manual page 98

If the message appears, replace the CMX controller board. Record the
message and return it with defective CMX board.
118 UNDEFINED INTERRUPT
SEE USER'S GUIDE
1. Firmware error on the CMX controller board.
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.
119 TCB CORRUPTED
SEE USER'S GUIDE
1. Task Control Block on the CMX controller board has been corrupted.
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.
120 ACCESS NULL POINTER
SEE USER'S GUIDE
1. The processor tried to access a pointer that contains nothing (null).
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.
121 PAPER NOT AT SPEED
SEE USER'S GUIDE
1. Firmware error on the CMX controller board.
Cycle power. Run the print job again. If the message appears, download
the emulation software again.
2. Cycle power. Run the print job again.
98 Troubleshooting