CHAPTER 4 IMAGE FORMATION SYSTEM
4–22
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©
1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Figure 4-209 shows changes in the developing DC bias in relation to the density of different
originals. If the density of the original is higher (darker) than the Test Sheet and lower (lighter)
than a newspaper, the developing DC bias will vary between F5.0 and F7.5 in terms of Copy
Density lever position.
If the original is lighter than the Test Sheet, copies are made at an F5.0 equivalent (-270 V);
if it is darker than a newspaper, on the other hand, copies are made at an F7.5 equivalent (-400
V).
Figure 4-209
Figure 4-210
Density of original
DarkerLighter
Developing bias DC (V)
Test Sheet Newspaper
F5.0 equivalent
F7.5 equivalent
F5.0F7.5