Replacing Timing Belt (Ribbon) - SATO 9001226(A) Service Manual

7.8 REPLACING TIMING BELT (RIBBON)

Following long periods of use, a belt may become worn or excessively stretched beyond the printer's
adjustment ability and require replacement. It is at this time that the pulleys should be inspected for damage
or wear.
Before proceeding, switch off the printer and remove the main cover, left housing cover and the top left
1.
housing cover to gain access to the internal (electrical and mechanism) hardware. Refer to Section 7.1
Removal of Housing cover for details.
Unscrew five screws to detach the Main (CONT) PCB bracket from the printer frame. Refer to Section
2.
7.6 Replacing Torque Limiter (Ribbon Unwinder) for details.
Follow step 4 to step 7 of Section 7.5 Replacing Ribbon Feed Roller, Oneway Clutch and Torque
3.
Limiter to remove the Ribbon frame from the printer. Set all the parts aside for reassemble.
Loosen the adjustment screw of tension bracket as shown. Refer to Section 6.19 Adjusting Timing Belt
4.
Tension for details.
IMPORTANT : Do not remove the screws.
Detach the Timing belt 60 S2M 254 (2) from the Gear Pulley_M(54/54) (3) and replace as necessary.
5.
And then remove the Gear Pulley_M(54/54) (3) from the ribbon shaft .
6.
Detach the Timing belt 60 S2M 386 (4) from the Gear Pulley (5).
7.
Detach the Timing belt 60 S2M 322 (6) from the Gear Pulley_K(83/83) (7) and replace as necessary.
8.
Reverse the above procedures for reassembly.
9.
After replacement, adjust the ribbon tension according to the procedure in Section 6.19 Adjusting
10.
Timing Belt Tension .
CAUTION:
A PROPERLY TENSIONED BELT WILL BE JUST ENOUGH TO PREVENT SLIPPAGE.
AN OVERLY TENSIONED BELT WILL EXCESSIVELY INCREASE DRAG ON THEIR
PULLEYS AND INCREASE COMPONENT WEAR.
TG3 Series Service Manual
3
6
7
1
5
Tension
bracket
Section 7: Replacement Procedures
2
4
1
Tension
bracket
Page 7-13