Instruction manual

The Procedures
43
Replace the hammer bank cover assembly if it is bent or damaged.
4. Check the platen gap. If the gap is too small, it can inhibit ribbon
movement.
Adjust the platen gap.
5. Power off the printer. Remove the paper path or pedestal top cover.
Disconnect P106 and P107 from the CMX controller board. Check the
resistance of LRIB M in P106 and RRIB M in P107. (Refer to the Main
Wire Harness Test Tables in Appendix A.)
If ribbon motor resistance is not correct, replace the motor. If the
resistance is correct, disconnect the ribbon motor cables from the
motors and check continuity. Replace a cable if it fails the continuity
test.
6. Power on the printer. Run a diagnostic print test.
If the RIBBON STALL message appears, replace the CMX controller
board. Record the message and return it with the defective board.
48V PWR FAIL* Message
1. 48 Volt Power Failed: an internal power failure. Power off the printer.
Remove the paper path or pedestal top cover. Check that power supply
connector P101 is fully seated in connector J101 on the CMX controller
board.
Connect power supply connector P101 to J101 on the CMX controller
board.
2. If the printer has the expansion-CT board, check the adapter connection
to the CMX controller board.
Make sure the 60-pin expansion adapter is correctly seated in the
CMX controller board and the CT board.
3. Power on the printer.
If the message appears, replace the hammer bank logic cable
assembly (P108) and the power cable assembly (P105). (Refer to
Appendix A.)
4. Power on the printer.
NOTE: If the message appears, replace the power supply board.
5. Power on the printer.
If the message appears, replace the CMX controller board. Record
the message and return it with defective CMX board.
6. Power on the printer.
If the message appears, replace shuttle frame assembly.
ACCESS NULL PTR* Message
1. Access Null Pointer. The processor tried to access a pointer that contains
nothing (null).