Kyocera Mita DC-1560, Service Manual

Page: 53 / 289

1AF
1-3-18
Exposure control for manual exposure and photo modes
The halogen lamp light intensity for manual exposure and photo modes is calculated from
the data obtained by running simulation 24.
Light intensity value
1-2
0
1-3 1-4 1-5 1-6 1-7 1 2 3 4 5 6
7 7-1 7-2 7-3 7-4 7-5 7-6
Manual exposure mode
Photo mode
Exposure scale (Exp.)
Drum potential
680 V DC
Drum potential 850 V DC
Drum potential
680 V DC
Figure 1-3-14 Exposure gradient setting
• Exposure control for manual exposure mode
The gradient between Exp. 1-2 and Exp. 7 is determined from the halogen lamp light
intensity values for Exp. 1, Exp. 4 and Exp. 7 set in simulation 24. For exposure settings Exp.
7-1 and above the drum potential is set 170 V below the normal level and the light intensity
is reduced since the intensity at such high exposure levels cannot be increased by simply
increasing the halogen lamp control voltage. The amount of exposure for the high settings
between Exp. 7-1 and Exp. 7-6 is determined by the halogen lamp light intensity value for
Exp. 7-1 set in simulation 24 and the gradient between Exp. 4 and Exp. 7.
• Exposure control for photo mode
The drum potential is set 170 V below the normal level and the halogen lamp light intensity
value is set low for photo mode.
The halogen lamp light intensity value for photo-mode Exp. 4 is determined by running
simulation 24. The light intensity for manual-mode Exp. 1-4 is used as the value for photo-
mode Exp. 1, which determines the gradient between Exp. 1 and Exp. 4 for photo mode.
Similarly, the light intensity for manual-mode Exp. 7-3 is used as the value for photo-mode
Exp. 7, which determines the gradient between photo-mode Exp. 4 and Exp. 7.