IBM 6400 series Maintenance Manual page 76

017 STACKER JAM
CHECK STACKER Message
1. Paper is bunching above the elevator or the paper motion detector is not working
properly.
Remove the paper jam.
2. Power off the printer. Check that the wheel of the stacker paper motion detector
rests against the rear brace of the paper throat. Also make sure the wheel rotates
freely on its axle.
If necessary, gently bend the brace toward the paper motion detector
wheel until the wheel contacts the brace. Clean the stacker paper motion
detector.
3. Power on the printer. Operate the power stacker. (Refer to the Operator's Guide .)
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
Tighten pulley setscrews and/or replace damaged components as
necessary.
4. 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.)
Replace any cable that is damaged or fails continuity test. Reconnect all
stacker cables to the CMX controller board, stacker, and stacker control
panel.
018 STACKER FULL
CHECK STACKER Message
1. Status message: the power paper stacker is full.
Unload the stacker.
2. Check the stacker limit switches. (See page 129.)
If the limit switches are OK, go to the next step.
3. Power off the printer. Remove the paper guide assembly. Disconnect stacker
cables from the CMX controller board, stacker assembly, and the stacker control
76 Troubleshooting