Canon NP6085 Service Manual page 117

Figure 3-311 shows changes in the intensity of the scanning lamp in relation to different densities of
originals under normal humidity conditions. If the density of an original is higher (darker) than that of the
Test Sheet and is lower (lighter) than that of a newspaper, the intensity of the scanning lamp is varied
between 'medium' and 'maximum' in terms of copy density notations. If the density of the original is lower
(lighter) than that of the Test Sheet, the scanning lamp is turned ON at the medium intensity; if it is dark-
er than a newspaper, the scanning lamp is turned ON at the maximum intensity for copying.
In low humidity conditions, on the other hand, the scanner is turned ON at the medium intensity if the
density of the original is higher (darker) than that of the Test Sheet; the intensity will be of a specific level
from light to dark (Figure 3-311a). At this time, the application voltage to the primary charging assembly is
lowered to lower the density.
Maximum
Medium
Light
Test Sheet
Figure 3-311a
The settings for this mode in which the intensity is maintained at a specific level in low-humidity condi-
tions and the voltage of the primary charging assembly is varied may be varied in service mode
(PRCC_SEL; ) to suit the user's needs.
5
COPYRIGHT © 1996 CANON INC.
Original
Dark
density
Newspaper
Setting
0 Enabled at all times
1 ON under low humidity conditions
2 Disabled
CANON NP6085 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
Maximum
Medium
Light
Test Sheet
Figure 3-311b
Mode
3. OPERATIONS AND TIMING
Original
Dark
density
Newspaper
3-59