Operation; 2Nd Transfer Roller Pressure/Retraction Control - Konica Minolta magicolor 1690MF Service Manual

Theory of Operation Ver. 1.0 Nov. 2008

14.3 Operation

14.3.1

2nd transfer roller pressure/retraction control

• In color printing, the toner image of each color of toner is transferred to the transfer belt
(thus a total of four times to cover the four colors of toner). Pressure/retraction control
with respect to the transfer belt is therefore provided for the 2nd transfer roller.
• In the standby state, the 2nd transfer roller is in a position retracted from the transfer belt.
• The pressure/retraction operation is performed by the Transport motor (M1), 2nd image
transfer pressure/retraction solenoid (SD4), and the pressure/retraction clutch.
• When the 2nd image transfer pressure/retraction solenoid (SD4) is energized, drive from
the Transport motor (M1) is transmitted to the pressure/retraction clutch.
A. Pressure sequence
1. Drive from the Transport motor (M1) is transmitted to the drive gear.
2. Rotation of the drive gear is transmitted to the Pressure/retraction clutch.
3. When the 2nd image transfer pressure/retraction solenoid (SD4) is energized, the
Pressure/retraction clutch rotates a half turn. This moves the Pressure slider.
4. When the Pressure slider is moved, ribs on the Pressure slider push up the 2nd
transfer assy.
5. When the 2nd transfer assy is pushed up, the 2nd transfer roller is pressed up
against the transfer belt.
2nd image transfer pressure/retraction solenoid (SD4)
Pressure slider
14. 2nd transfer section/ media separation
Ribs
Pressure/retraction clutch
2nd transfer assy
A034T2C535AA
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