Star Micronics SP500 Series, Technical Manual

Page: 19 / 73

– 16 –
11. Photo-interrupter for old type
(1) Turn off the power switch and disconnect the power
cord from the wall outlet.
(2) Remove the printer mechanism according to the
procedure described in item 2.
(3) Remove
•
Screw
1
•
Detector holder
2
•
Black mark detector board assembly
3
Detach the two hooks on the detector holder.
•
Photo-interrupter
4
Remove the photo-interrupter by using a
desoldering tool with vacuum pump.
Notes for reassembly:
Note the polarity of the Photo-interrupter.
Attach the photo-interrupter
4
to the black mark
detector board assembly
3
using soldering iron, so
that photo sections come left.
(4) After reassembly, adjust the Black Mark Sensor
Alignment. (Refer to the chapter 1)
1
2
3
4
Photo sections
3
4