SX™
Service and Maintenance Manual 3-56
960714-02B © 2007 I2407
SECTION 3 – COMPONENT REPAIR
FILM FEED ASSEMBLY
PHOTOELECTRIC SENSOR
Some of the procedures in this section require that
the electrical power to the machine remain ON.
The photoelectric sensor is located behind the front
finger plate below the film feed drive roller. This
sensor detects the edge of the bag when the film
feed drive roller is reversed, thus stopping the
reverse motion of the film. There are three steps
involved in testing the photoelectric sensor.
- Ensure machine power is on.
1. Check the photo sensing eye to ensure the
sensing beam is illuminated. The sensing
beam is the red light visible from the front of
the machine. If the red sensor beam is not on,
either the sensor is faulty or there is no power
to the electric eye. Remove the frame guard
(see Figure 3-144) and follow the wires from
the sensor to the terminal block/breakout
module and ensure the wires are making a
positive connection with the terminals. If the
connections are good, the sensor is faulty and
needs replacement.
2. With the cradle cover open, locate the two
indicator lights on the left-hand side of the
sensor. The lower light should be illuminated
green. Pass your hand in front of the eye
(within 1 inch of the front finger plate) while
watching the indicator lights. The upper light
should illuminate orange when the sensor is
activated. If it does not, the sensor is faulty
and needs replacement.
3. Remove the frame guard by removing the six
screws shown in (figure 3-144). Locate the
PLC. Watch the indicator light on the PLC
labeled “X2” and watch to see if it turns on
when the sensor is activated. If it does not, the
sensor wires are faulty and the sensor needs
replacement.
TESTING
USE EXTREME CAUTION WHILE SERVICING
A MACHINE WHILE POWER IS APPLIED.
UNEXPECTED MACHINE STARTUP CAN
CAUSE SERIOUS INJURY.
WARNING
DO NOT ATTEMPT TO SERVICE THE
MACHINE DURING NORMAL OPERATION.
KEEP HANDS AND ARMS CLEAR OF
MOVING PARTS.
WARNING
WHILE TESTING ELECTRICAL
COMPONENTS WITH POWER APPLIED TO
THE MACHINE, USE PROPER
TROUBLESHOOTING TECHNIQUES TO
AVOID ELECTRICAL SHOCK.
WARNING
Figure 3-144. Frame Cover Screws
Figure 3-145. The PLC
PLC ‘X2’
Input