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• Adjustments for printing
Make the following adjustments after setting the ribbon cassettes and paper.
(1)
Adjusting the position of the dot sensor
Print characters and check the darkness of the upper and the lower part of characters. If the darkness is
not equal, adjust the position of the dot sensor.
E
(a)
......-Light
(b) ...... Upper part is light, move
the dot sensor to right.
E
unit
(c) ...... Lower part is light, move
it to left.
(b)
E
Black and white
-
-
dot sense PH wire (c)
(b)
Black and red
dot sense LED wire
(c) "Light
Figure 18
(2)
Adjusting the printing start position with the carrier unit and the home sensor
i)
The gaps between the carrier unit and the home sensor
Gaps A and B should be about 0.5 mm, with B smaller than C. The gaps can be adjusted by
twisting oblique line part of the earth plate (L).
A
\',\\\
\'
Home sensor unit
, Carrier unit
Figure 19
Earth plate (L)
Black and blue,
home sense
LED wire
ii)
Adjustment for aligning the start position of printing
(Connect TP1 and TP2 of PCB unit to oscilloscope)
Yellow and black,
home sense
PH wire
Adjust the position of the home sensor unit so that the falling- edge of the home sensor pulse
can be within the permissible range of the dot sensor pulses.
21
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