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1.5.2 Printing Density Change
VT2100/VT2130/VT2150
Circuit in Line mode:
lm3geSlgnd
I
Shading DtatonJon
I
13
I
Vs
Memory Correction
1~1
I
VII
I
Signrll
I
Setectof1
Oupu
BlackData
COrrecttOrr
t
I
I
I
I
I
I
m
I
Convener
I
I
I
I
VL
UJF
k—-———
—a
I
c)
4blt
Image
Signal
Gate
I
t
o
4bit
Image
signal
<
'- : -
"
Salactof3
5
73%
30
A
CNS06-2
67*A
50
B
CN606-3
3
>
47*A
60
Prkmlng
c
CN606-5
1
Danalty
CN606-1
2
S.w.
1.7V
cm
Ap
Convanw
SW ON
CN606
(Terminal
No.)
-*
-~
-~
Selector 3
MANUAL
1
1-2
H
H
L
COM-3
MANUAL 2
2-3
H
L
H
COM–5
Standard
—
H
H
H
COM-1
MANUAL 3
4-5
L
H
H
COM-6
The printing density can be changed by the printing density switch when in the
line mode. This switch changes the threshold level to 47 %, 67 %, or 73 % of
the white level,
The selected threshold level enters port
VL
while the shading distortion
corrected image signal enters port
VH
of the A/D mnverter.
In manual printing density mode (Dark, Darker, and Lighter), the A/D converter
outputs either all "H" BAD signals (4 bit) or all "L" BAD signals (4 bit). This is
determined by the LUF signal
When the image signal is lower than the threshold level, the LUF signal is
output from the A/D converter to make all BAD signals "H". Then the image
signal is output as a black.
When the image signal is higher than threshold level, LUF signal is not output.
Then the BAD signals are all "L".
2-7
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