2BT
1-4-9
Maintenance
Description
item No.
U053
Performing fine adjustment of the motor speed
Description
Performs fine adjustment of the speeds of the motors.
Purpose
Used to adjust the speed of the respective motors when the magnification is not correct.
Method
Press the start key.
Setting
1. Select the item by lighting a copy exposure indicator using the copy exposure adjustment keys.
2. Change the setting using the zoom +/– keys.
Copy exposure indicator Description
Setting range
Initial setting
Exp. 1
Drive motor speed adjustment
–7.0 to +7.0
0
Exp. 3
Polygon motor speed adjustment
–5.0 to +2.0
0
Drive motor speed adjustment (unit: %)
Increasing the setting makes the image longer in the auxiliary scanning direction, and decreasing it makes
the image shorter in the auxiliary scanning direction.
Polygon motor speed adjustment (unit: %)
Increasing the setting makes the image longer in the main scanning direction and shorter in the auxiliary
scanning direction; decreasing the setting makes the image shorter in the main scanning direction and
longer in the auxiliary scanning direction.
3. Press the start key. The value is set.
Test copy mode
While this maintenance item is being performed, a VTC pattern shown below is output in test copy mode.
Correct values for an A4/8
1
/
2
"
×
11" output are:
A
= 260
±
2.6 mm
B
= 180
±
1.8 mm
A
B
Figure 1-4-1
Adjustment
1. Press the size select key. The machine enters the test copy mode.
2. Press the start key. Output an A4/8
1
/
2
"
×
11" VTC pattern.
3. Measure
A
and
B
on the VTC pattern (Figure 1-4-1), and perform the following adjustments if they are
different from the correct sizes:
A
: Drive motor speed adjustment
B
: Polygon motor speed adjustment
Completion
Press the stop/reset key at the screen for selecting an item. The indication for selecting a maintenance item No.
appears.
