IBM Infoprint 6500-v05 Maintenance Manual page 190

Symptom
Stacker does not stack properly
-or-
Stacker elevator does not move
Stacker elevator moves by itself
Table 5. General Symptom List
1. Power off and unplug the printer.
2. Check for and remove any obstructions preventing elevator movement.
3. Check for misaligned stacker rails Adjust the stacker rails if they are not vertical and parallel.
4. Plug in the printer and power it on. 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.
5. Check the stacker limit switches. (See page 191.) If the limit switches are OK, go to the next step.
6. Check the stacker motors. (See page 192.) If the stacker motors are OK, go to the next step.
7. Remove the paper guide assembly. Disconnect stacker cables from the controller board, stacker
assembly, and the stacker operator panel (see Figure 71, page 474). Check cables for cuts, breaks,
or damaged pins. Check continuity of cables. Replace any cable that is damaged or fails continuity
test. Reconnect all stacker cables to the controller board, stacker, and stacker operator panel.
1. Power off and unplug the printer. Inspect all stacker LEDs for dust, chaff, or dirt. Clean the stacker
LEDs and the sight tubes on the LED mounts.
2. Plug in the printer and power it on. If the stacker elevator moves by itself, replace the stacker LEDs.
Corrective Action
General Symptom List
190