IBM 6400 Series - Page 94

94 Troubleshooting
101 UPPER DRIVER SHORT
1. Hammer driver circuits on the CMX controller board are shorted to ground.
Cycle power. If the message appears, press Stop. If the message does
not clear, replace the hammer bank logic cable and the hammer bank
power cable assemblies.
2. Power on the printer.
If the message appears, replace the CMX controller board. Record the
message and return it with the defective board.
3. Power on the printer.
If the message appears, replace the shuttle frame assembly.
102 LOWER DRIVER SHORT
1. Circuit(s) on the hammer bank or in the hammer bank power cable are shorted to
ground.
Cycle power. If the message appears, press Stop. If the message does
not clear, replace the hammer bank logic cable and the hammer bank
power cable.
2. Power on the printer.
If the message appears, replace the shuttle frame assembly.
3. Power on the printer.
If the message appears, replace the CMX controller board. Record the
message and return it with the defective board.
105 HAMMER COIL <number> OPEN
1. Electrical malfunction of one or more hammer coils.
Cycle power. If the message appears, replace the shuttle frame
assembly.
2. Power on the printer. Run a print test.
If the message appears, replace the CMX controller board. Record the
message and return it with the defective board.