IBM 6400 Series, Maintenance Manual

Page: 129 / 428

129 Troubleshooting
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.
4. Check the stacker limit switches. (See page 129.)
If the limit switches are OK, go to the next step.
5. Check the stacker motors. (See page 130.)
If the stacker motors are OK, go to the next step.
6. 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.
Stacker elevator moves by itself
1. Power off the printer. Inspect all stacker LEDs for dust, chaff, or dirt. (See
Figure 85 through Figure 87, pages 406 through 410.)
Clean the stacker LEDs and the sight tubes in the LED mounts.
2. Power on the printer.
If the stacker elevator moves by itself, replace the stacker LEDs. (See
Figure 85 through Figure 87, pages 406 through 410.)
Stacker limit switch check
NOTE: This procedure tests the motion limit switches at the top and bottom
of the vertical rails. You will usually be referred to this procedure
from other troubleshooting procedures. When you have completed
this procedure, return to the procedure that sent you here.