SX
™
Service and Maintenance Manual 3-1 960714-02B © 2007 I2407
SECTION 3 – COMPONENT REPAIR
ELECTRICAL COMPONENTS
PRESSURE JAW AND FILM FEED
MOTOR CONTROLLERS
The Sharp SX
TM
bagger uses stepper drive
technology to precisely control the movement of
various mechanical systems. This section will
describe how to service the two TM4500 stepper
drive units. These units control the Pressure Jaw
and Film Feed motors.
1. Remove the four screws holding the Load
Plate, set screws and Load Plate aside (Figure
3-1).
2. Locate the two identical stepper drives inside
the Sharp SX
TM
Bagger. The Pressure Jaw
drive is on the left and the Film Feed drive is on
the right (Figure 3-2).
3. Locate the fuse on the defective unit (Figure 3-
3).
4. Set your Digital Volt/Ohm Meter (DVOM) to test
for continuity.
5. With the red probe, make contact with the
metal on one side of the fuse and with the
black probe make contact with the other side of
the fuse (Figure 3-3).
6. If your DVOM indicates that there is no
continuity, replace the fuse.
Note: A blown fuse can be an indication of a
larger problem. If you continue to blow fuses,
test the stepper motors and power
connections.
TESTING
Figure 3-3. Fuse Probe Locations
Figure 3-1. Load Plate Screws
Figure 3-2. TM4500 Drive locations
Pressure
Jaw
Film
Feed
Always remove electrical power from the
SX
prior to performing any maintenance
on the machine.
WARNING