Minolta Di551 Service Manual page 315

ADJUSTMENT
*8 Image density selection
These bits set image write laser PWM. Against
exessive density of 100% black color, thick letters
and lines, and excessive toner consumption, the
setting should be made by selecting "light." In
the opposite case, select "dark."
Mode
Darker (255)
Normal (235)
Lighter (215)
Note: There are three DIP switches to change
the image density :
5-0/1(toner concentration threshold),
5-2/3 (laser PWM), and 23-2/3 (toner
density of developer). The priority of
order of these adjustments are as follows:
(1) Laser PWM
(2) Toner density of developer
(3) Toner concentration threshold
*9 Transfer/separation output for plain paper
These bits are used when "- - - -", "Normal",
"Color", "Special" or "Seal" is selected for "Paper
type/special size setting" in the key operator
mode.
When "User paper" is selected with this bit, the
transfer/separation output for the "user paper
setting" made in the 36 mode is applied.
When "No specification" is selected, the output
data by destination and paper size (metric or inch
system) (Japan /metric: 64 g/m
Inch: 20 lb plain paper, Inch area / Inch 20 lb
plain paper, metric: 80 g/m
area / metric: 80 g/m
plain paper) is used.
Mode
No specification
Not used
Not used
Not used
Recycled paper 1 (Japan)
Recycled paper 2 (Inch area)
Recycled paper 3 (Metric area)
User paper
5-3 5-2
0 0
0 1
1 0
2
plain paper,
2
plain paper, Metric
2
plain paper, Inch: 20lb
6-2 6-1 6-0
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
2-18
*10 Transfer/separation output for thick paper
This bit is used when "Thick" is selected for
"Paper type/special size setting" in the key oper-
ator mode to change transfer/separation output,
linear speed, and fixing temperature.
When "No specification" is selected, standard
2
data for 170 g/m or heavier paper is used.
2
• 170 g/m or heavier (TSL OFF) : When toner
is scattered around the image.
• Plain paper : Transfer / separation data for
plain paper of each destination is used to set
only the line speed and fixing temperature for
thick paper. This setting is applied when the
fixing condition is insufficient even though
paper is not so thick.
Mode
No specification
2
170 g/m or more (TSL OFF)
Plain paper
*11 Transfer/separation output for thin paper
This bit is used when "Thin" is selected for "Paper
type/special size setting" in the key operator
mode.
When "No specification" is selected, the output
data by destination (Japan: 52.4 g/m
area: 16 lb, paper, Metric area: 48 g/m
used.
Mode
No specification
2
52.4 g/m paper
2
64 g/m paper
*12 Toner guide roller current correction
When the room temperature causes defect
cleaning, the bias value of the toner guide roller
should be changed to +10 µ A or +20 µ A . If the
original setting value is changed without any
defective cleaning observed, the drum can be
damaged, or the toner may be spilled. In this
case, the use of copier is never recommended.
Mode
Standard
Approx. +10 µ A
Approx. +20 µ A
No correction
6-4 6-3
0 0
0 1
1 0
2
paper, Inch
2
paper) is
6-6 6-5
0 0
0 1
1 0
7-1 7-0
0 0
0 1
1 0
1 1