Dot Diameter Adjustment; Ld1 Offset Adjustment - Konica Minolta 7145 Service Manual

7145 series Field Service Ver.4.0 Mar. 2004
8.5

Dot diameter adjustment

The MPC value can be corrected to change the
image density (dot diameter) by entering a setting.
(Common to copier/printer/fax)
Major cases in which this adjustment is used:
• When you want to change the image density.
• When changing the write unit or TCSB (toner
control sensor board), or when cleaning the
dust-proof glass.
Preparation: The drum cartridge must be set in
advance.
A. Procedure
1. Enter the 36 mode.
2. "36 mode menu screen"
Press the [1. Process adjustment] key.
3. Press the arrow key repeatedly until the "Dot
diameter adjustment" is displayed in the mes-
sage column.
4. "Dot diameter adjustment screen"
Select the set value [-3] to [+3], and press the
[START] key.
According to the value set, the dot diameter is
automatically adjusted.
• Set value: -3 (toward the lighter) to +3 (toward
the darker)
5. Press the [RETURN] key to return to the "36
mode menu screen".
Note:
• When the adjustment is made toward the darker,
the dot diameter becomes thick and the toner
consumption is increased.
8.6

LD1 offset adjustment

The write position of the LD1 laser is adjusted.
This adjustment must be made when replacing the
write unit, drum and/or the developer.
Preparation: The drum cartridge must be set in
advance. The developing unit must be filled with
developer. The L detection adjustment, toner den-
sity adjustment and the dot diameter adjustment
must be completed.
A. Procedure
1. Enter the 36 mode.
2. "36 mode menu screen"
Press the [1. Process adjustment] key.
3. Press the arrow key repeatedly until the "LD1
offset adjustment" is displayed in the message
column.
4. "LD1 offset adjustment screen"
Press the [COPY] key.
5. Select A3 or 11 x 17 size paper, then press the
START button to print the test pattern.
6. Check the test pattern.
Specification: Check to see if the LD1 laser out-
put patterns are uniform as shown in the draw-
ing below and the starting points of the low
density section are matched between the refer-
ence lines.
* Since a single beam is employed for 7235/
7228/7222, the pattern shown as LD2 in the
illustration below is also output by LD1.
LD1 LD2 LD1 LD2 LD1 LD2 LD1 LD2
[1] Reference line
7. If it is not within specification, press the # button
while holding down the
8. "LD1 offset adjustment screen"
Input the offset value through the numeric keys
and press the [SET] key.
• Setting range: -128 ~ +127
1-47
36 MODE
[1]
∗
button.
3