Service manual

Page 5-2
Section 5. Mechanical Adjustments
PN 9001080
Rev. A
SATO M-8485Se Standard Print Engine
Service Manual
STEP PROCEDURE
1. Remove the ribbon if installed.
2. Place an empty ribbon core on the ribbon unwind spindle. Attach the free end
of the string to the tension gauge. Fig. 5-1, 5-2
3. Wind the string tightly around the ribbon core in a single layer and in a
clockwise direction. Attach the free end of the string to the tension gauge.
4. Gradually lift the tension gauge, pulling the string to unwind it from the core.
Once the spindle begins to move, the gauge should indicate 600 to 800 grams
of tension. Excessive or insufficient tension must be corrected by adjusting
the ribbon unwind clutch.
To adjust the clutch, loosen the set screw and move the adjust nut CW for
more tension and CCW for less tension. Tighten the set screw and repeat
Steps 3 and 4 until the correct tension is achieved.
Excessive ribbon unwind and rewind tension will result in variable ribbon motion and could
be the cause of print quality problems.
Follow the procedures 5.2.1 and 5.2.2 to verify that the ribbon unwind and rewind tensions
are within specification or if adjustment of either clutch is necessary.
5.2.1 Ribbon Unwind Clutch Adjustment
To adjust the Ribbon Unwind Clutch, perform the following steps:
Required Equipment:  1 Kg Tension Gauge
For 5.2.1 and 5.2.2  Ribbon Core, empty
 String
 12mm Wrench
 #2 Phillips Screw Driver
5.2 Ribbon Clutch Adjustments