IBM 6400 series Maintenance Manual page 77

panel (see Figure 61, page 380). Check cables for cuts, breaks, or damaged
pins. Check continuity of cables. (See Appendix A.)
Replace any cable that is damaged or fails continuity test. Reconnect all
stacker cables to the CMX controller board, stacker, and stacker control
panel.
019 STACKER FAULT
CHECK STACKER Message
NOTE: This message is triggered when the elevator cannot reach either the
1. Power on the printer. Operate the power stacker. (Refer to the Operator's Guide .)
Check for obstructions preventing elevator movement.
Remove obstructions.
2. Operate the power stacker. While the stacker is operating, check that:
a) all motors are operating
b) the paddles are rotating
c) the elevator moves smoothly and without obstruction
d) the timing belts are undamaged and the belt pulleys are not slipping
e) the extension springs are attached and undamaged (not bent or stretched)
f) the drive rollers are not damaged
g) the constant force springs are tightly mounted and undamaged
Tighten pulley setscrews and/or replace damaged components as
necessary.
3. Check for misaligned stacker rails
Adjust the stacker rails if they are not vertical and parallel.
4. Check the stacker limit switches. (See page 129.)
If the limit switches are OK, go to the next step.
5. Disable the power stacker unit under the Printer Control menu. (Refer to the
Setup Guide .)
If the message occurs, replace the CMX controller board.
6. Power off the printer. Remove the paper guide assembly. Disconnect stacker
cables from the CMX controller board, stacker assembly, and the stacker control
panel (see Figure 61, page 380). Check cables for cuts, breaks, or damaged
pins. Check continuity of cables. (See Appendix A.)
Troubleshooting
top or bottom position switch before timing out.
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