Test The Power Paper Stacker - Printronix P9012 Maintenance Manual

Test the Power Paper Stacker

The stacker senses the presence of paper by transmitting a beam of infrared
(invisible) light from the emitter to the light shield. When the emitter is
properly adjusted and the infrared beam is unobstructed, the BEAM LED
will be illuminated. When the beam is obstructed by paper on the rack, the
stacker will halt and the BEAM LED will go out. The paper should then be
removed and the stacker returned to the operating position (i.e., fully raised).
1. Turn on printer power and place the printer off line.
2. Open the rear printer door and locate the power stacker control panel (1).
The LED labeled BEAM (2) on the panel should be lit. If not, the
infrared light beam between the emitter (3) and the light shield (4) is
obstructed, or the emitter is misaligned. To check the alignment of the
emitter:
a. Make sure the beam is not obstructed by anything, such as paper or
b. Locate the emitter protruding through the access hole in the center
c. Observe the BEAM LED on the stacker control panel. The LED
d. If the LED is off, align the emitter by adjusting the three screws (5)
Unscrewing the adjustment screws to the point that they disengage the
emitter causes the emitter to vibrate during printer operation.
3. Press the paper stacker toggle switch "UP." The rack should raise until it
blocks the beam, trips the upper limit switch, or the switch is released.
Press the switch "DOWN" to lower the rack until it trips the lower limit
switch.
4. If the paper stacker does not operate as described above, verify that each
connector is properly installed and that there are no bent pins.
A–18
(Figure A–9)
the rack.
panel.
should light if the emitter is properly adjusted. Since the light beam
is infrared, it is invisible. Therefore, you must check the LED to
make sure the emitter is properly aligned.
with a 7/64–inch Allen wrench.
IMPORTANT
Power Paper Stacker Maintenance