IBM 6400 series Maintenance Manual page 104

If the message appears, replace the CMX controller board. Record the
message and return it with defective CMX board.
137 SHUTTLE INVALID COMMAND
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.
138 SHUTTLE INVALID PARAMETER
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.
139 SHUTTLE OVERSPEED
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. Remove the shuttle cover. Remove the paper guide assembly or the pedestal top
cover. Make sure the MPU cable is not pinched. (Refer to Appendix A,
Interconnection Diagram, page 295.)
Check the resistance of MPU in P107. (Refer to the Main Wire Test
Tables, page 297.) Replace the MPU if it fails the test.
3. 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.
104 Troubleshooting