Operation - Konica Minolta BIZHUB 750 Service Manual

Theory of Operation Ver1.0 Aug.2005
26.1.2

Operation

A. Cooling fan /1 (FM1) control
(1) Purpose
To exhaust around the drum and the fusing section.
(2) ON timing
• While in the warm-up, turns ON (rotates at a low speed) in accord with the drum motor (M2).
• While in the idle, turns ON at all times.
• While in the print, rotates at a high speed in accord with M2, and rotates at a low speed a specified period
of time after completion of the print.
(3) OFF timing
• While in the warm-up, turns OFF in accord with M2.
• After completion of the warm-up, does not turn OFF until the power switch (SW2) is turned OFF.
B. Polygon cooling fan (FM2) control
(1) Purpose
To cool down around the polygon motor (M15) and the write section.
(2) ON timing
• Turns ON (rotates at a low speed) in accord with the polygon motor (M15).
• While in the warm-up and during idling, turns ON (rotates at a low speed) at all times.
• While in the print, rotates at a high speed in accord with the fusing motor (M4) and rotates at a low speed
when the drum motor (M2) turns OFF.
(3) OFF timing
After completion of the warm-up, does not turn OFF until the power switch (SW2) is turned OFF.
C. Transfer/separation suction fan (FM3) control
(1) Purpose
To exhaust around the transfer/separation corona unit and the conveyance section.
(2) ON timing
• While in the warm-up and the print, turns ON in accord with the drum motor (M2).
(3) OFF timing
• While in the idle, turns OFF at all times.
• While in the warm-up and the print, turns OFF in accord with the turning-OFF of M2.
D. Developing suction fan (FM4) control
(1) Purpose
To collect toner scattered from the developing unit into the developing suction filter.
(2) ON timing
• While in the warm-up and the print, turns ON in accord with the drum motor (M2).
(3) OFF timing
• While in the idle, turns OFF at all times.
• While in the warm-up, in the print and after completion of print, turns OFF in accord with the turning-OFF of
M2.
26. OTHERS
99