Star Micronics LC-8521, Technical Manual

Page: 39 / 124

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1. Adjustment of Gap Between Print Head and Platen
(1) Remove the upper case unit and ribbon holder [1] according to the procedures described in chapter 4. (Fig. 3-1)
(2) Install rear angle
[2]
. (Drive the screw tightly while pushing down rear angle.)
(3) Set adjust lever [3] to the second position from the bottom. (Fig. 3-1)
(4) Adjust the head gap at the specified left, right and center positions (three places [4] ). (Fig. 3-2)
*Measure the gap between platen
[4]
and Print head
[5]
using a gauge
[6]
. (Fig. 3-3)
*Gap adjustment values : 0.30 to 0.35mm.
*Left, Right positions : Use adjust bushing L, R
[7]
to adjust the gap. (Fig. 3-4)
*Center position : Use gap adjustment assy [8] to adjust the gap. (Fig. 3-5)
*Adjust sequenc (six) : Left
→
Right
→
Center
→
Left
→
Center
→
Right
(5) Loosen rear angle [2]
(6) Install the ribbon holder
[1]
, rear angle
[2]
and upper case.
Fig. 3-1 Mechanism Fig. 3-2 Positioning the carriage unit
Fig. 3-3 Gap measurement Fig. 3-5 Gap adjustment assy
Ribbon holder [1]
Second
Ajust lever [3]
Adjust gear
Adjusting busing R [7]
Adjusting busing L [7]
Rear angle [2]
Gap adjustemet assy [8]
Carriage unit
Roller angle unit
(right) (center) (left)
Frame
(R)
Frame
(L)
Adjust position
Head gap
0.30~0.35mm
Platen [4]
PF roller
Gauge [6]
Print head [5] gap
+ –
L
gap
+ –
R
Frame holder unit
Rear angle assy
Fig. 3-4 Adjusting bushing