SX™
Service and Maintenance Manual 3-94
960714-02B © 2007 I2407
SECTION 3 – COMPONENT REPAIR
PRINTHEAD CRADLE ASSEMBLY
PRINTHEAD POSITION DRIVE BELT
(con’t)
5. Slide the belt off the transfer shaft pulley, and
replace with the new belt.
6. Reinstall the outside cradle plate, and reinstall
the five screws that hold it in place.
7. Place the motor into the machine, being sure to
orientate the cable receptacle to the top-rear of
the machine. Also be sure the belt is over the
pulley.
8. Reinstall the screws into the motor standoffs
through the slots in the outside cradle plate.
Before tightening into position, be sure to set
the belt tension to a satisfactory level. The
center of belt span should displace about 1/16
th
of an inch when pressed with one finger
perpendicular to the belt travel (Refer to
Machine Adjustments: Checking Belt
Tension
for a more detailed explanation).
9. Reinstall the motor cable.
10. Replace all guards removed in the previous
steps.
PRINTHEAD PRESSURE CAMS
The printhead cams press on the top of the
printhead pressure assembly while imprinting on
the film during operation of the Sharp SX
. The
cams also lift the printhead off the film while
feeding and not printing.
1. Symptoms of cam shaft wear include light print,
higher ribbon usage, and misfeeds with the
ribbon. Visually inspect the cam shafts for
unevenness in the bearing surfaces. The
profile of the cam should be smooth and round.
Flats spots in the cam indicate wear, and
require replacement of the plastic cams.
The printhead pressure cams are adjustment free.
Figure 3-231. Printhead Position Motor Orientation
Cable
Receptacle
TESTING
Always remove electrical power from the
SX
prior to performing any maintenance
on the machine.
WARNING
ADJUSTMENT
Figure 3-232. Cam Bearing Surfaces