IBM 6400 Maintenance Information Manual page 118

Chapter 5
Troubleshooting Other Symptoms
Symptom
Stacker does not stack
properly
-or-
Stacker elevator does
not move
Stacker elevator moves
by itself
118
Table 5. General Symptom List
Corrective Action
1. Check for and remove obstructions preventing elevator
movement.
2. Check for misaligned stacker rails Adjust the stacker rails if they
are not vertical and parallel.
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
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 119.) If the limit
switches are OK, go to the next step.
5. Check the stacker motors. (See page 120.) 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 68, page 376). 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.
1. Power off the printer. Inspect all stacker LEDs for dust, chaff, or
dirt. (See Figure 92 through Figure 94, page 405 through page
409.) 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 92 through Figure 94,
page 405 through page 409.)