Optical Path - Gestetner B147 Service Manual

6.6.2 OPTICAL PATH

The laser beams for cyan [C] and yellow [A] are directed to the upper part of the
polygon mirror [B], and those for magenta [E] and black [D] are directed to the
lower part of the polygon mirror. The LD mirrors (see the previous page) deflect the
laser beams for magenta and black towards the lower polygon mirror.
The WTL [F] corrects the main scan line; without this component, the line bends
out towards the middle of the main scan. The central bend of the WTL is adjusted
in the factory.
The speed of the polygon mirror depends on the selected mode (see below).
Resolution
Mode
(dpi)
B/W 600 x 600
(except 1,800 x 600
OHP/Thick
1,200 x 1,200
paper)
Color 600 x 600
1,800 x 600
(except
OHP/Thick
1,200 x 1,200
paper)
600 x 600
OHP/Thick 1,800 x 600
1,200 x 1,200
SM
[D]
[A]
Polygon motor Process line
speed (rpm) speed (mm/s)
21,850 185
29,528 125
29,528 125
29,528 62.5
29,528 62.5
6-39
LASER EXPOSURE
[F]
[B]
B146D522.WMF
Print speed
(ppm)
38
28
28
14
10
B147/B149/B190
[C]
[E]
Remarks
Dual beam
writing