Black Over Print - Gestetner B147 Service Manual

4.6.4 BLACK OVER PRINT

Black Over Print prevents unexpected white lines from appearing when black
letters or lines are printed with color background. You can enable or disable this
feature from the printer driver (default: disabled).
When it is enabled, Black Over Print has the following unpleasant side effects:
• Crispness may deteriorate because the black toner spreads out.
• More toner is consumed.
• The background color may be seen through black letters or lines.
Black Over Print Disabled
Black lines and color background are
printed as follows:
1. The color toner (for example,
magenta [B] and yellow [A] toner)
is transferred on the paper [C].
Some space [D] is left blank for
the black toner.
2. The black toner [E] is transferred
in the blank space.
If the line position of the black toner
is not correct, an unexpected white
line [F] appears.
Black Over Print Enabled
Black lines and color background are
printed as follows:
1. The color toner (for example,
magenta [B] and yellow [A] toner)
is transferred on the paper [C].
2. The black toner [D] is transferred
on the color toner.
Even if the line position of the black
toner is not correct, an unexpected
white line does not appear.
SM
TROUBLESHOOTING GUIDE
[D]
1
M
1
M
1 1
M
[F]
M
1
M
1
M
4-81
[A]
Y Y [B]
M
[C]
Y Y
K M
[E]
Y Y
K M
B146T920.WMF
[A]
[B]
Y Y Y
M M
[C]
[D]
K
Y Y Y
M M
K
Y Y Y
M M
B146T921.WMF
B147/B149/B190