Utax PF 420, Service Manual

Page: 33 / 77

3MH
1-3-10
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. Also speed adjust-
ment for each paper source can be performed in group 2.
Method
Setting
1. Press the start key.
2. Select the group using the image mode selection key.
3. Select the item to be set using the exposure adjustment keys.
: Off, : On
Adjustment
1. Press the interrupt key.
2. Press the start key to output a VTC pattern.
Figure 1-3-6
3. Change the setting value using the zoom +/- keys.
A: Drive motor speed adjustment
Increasing the setting makes the image longer in the auxiliary scanning direction, and decreasing it
makes the image shorter in the auxiliary scanning direction.
B: Polygon motor speed adjustment
Increasing the setting makes the image shorter in the main scanning direction, and decreasing it
makes the image longer in the main scanning direction.
4. Press the start key. The value is set.
Completion
Press the stop/clear key. The screen for selecting a maintenance item No. is displayed.
Maintenance
item No.
Description
Image mode
LEDs Exposure
indicator
Description
Setting
range Initial
setting
Exp. 1 (lit)
Exp. 2 (lit)
Exp. 3 (lit)
Exp. 4 (lit)
Exp. 5 (lit)
Exp. 1 (flashing)
Exp. 2 (flashing) Drive motor speed adjustment
Polygon motor speed adjustment
Eject motor speed adjustment
Drum motor speed adjustment
Eject motor speed adjustment 2
Eject motor speed adjustment 3
Eject motor speed adjustment 4 -5.0 to 5.0
-5.0 to 4.0
-5.0 to 5.0
-5.0 to 5.0
-5.0 to 5.0
-5.0 to 5.0
0.0 to 5.0 0.3
0.7
-0.5
0
0
0
0.5
Exp. 1 (lit)
Exp. 2 (lit)
Exp. 3 (lit) Motor speed adjustment (for paper
feed from MP tray)
Motor speed adjustment (for paper
feed from paper feeder)
Motor speed adjustment
(in duplex mode) -5.0 to 5.0
-5.0 to 5.0
-5.0 to 5.0
-0.1
-0.1
-0.3
Correct values for an A3/Ledger output are:
A = 300
±
1.0 mm
B = 270
±
1.0 mm