Printronix P7000 Series Maintenance Manual page 194

Chapter 3
Troubleshooting Other Symptoms
Symptom
Stacker "chatters" at upper or
lower limit
194
Table 6. General Symptom List
1. Power off the printer. Unload paper. Open the rear cabinet
door and check that stacker motion is not obstructed by
the control panel cable or other obstruction. Remove
obstruction or reroute the stacker control panel cable as
necessary.
2. Verify that the stacker rails are vertical and parallel. Adjust
the stacker rails if necessary: they must be vertical and
parallel.
3. Move the elevator up and down by hand and check that
the limit switches are being tripped at the highest and
lowest limits of elevator travel.
4. 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.
Solution