Detection Of A New Fusing Unit; Ppm Control - Konica Minolta bizhub c450 Service Manual

20. Fusing section
20.3.5

Detection of a New Fusing Unit

• When a new Fusing Unit is installed in the machine, the life counter is automatically
cleared through the machine's capability of detecting a new Fusing Unit.
• The new unit is detected when the Power Switch is turned ON or the Right Door is
opened and closed.
20.3.6

PPM control

• PPM (printed pages/min.) control is provided to ensure the condition of one power outlet
for one system and, at the same time, good fusing performance during continuous paper
feeding.
• Only the Heating Roller Heater Lamp is preferentially turned ON during a print cycle. In a
continuous print cycle, therefore, the surface temperatures of the Heating Roller and
Fusing Pressure Roller decrease, resulting in the fusing performance of the printed
image being degraded. Fusing performance is therefore estimated based on the surface
temperature of the Pressure Roller. The printed pages/min value is decreased according
to the paper length and system speed, thereby achieving the intended level of fusing per-
formance of the printed images (toner).
A. Plain paper
• When the surface temperature of the Fusing Pressure Roller is a predetermined temper-
ature or less with the machine interior temperature at 18ÅãC or less, PPM (printed
pages/min) is decreased.
System Speed Paper Length (mm)
216 or less
217 to 297 inclusive
215 mm/sec
Color print
298 to 381 inclusive
382 to 432 inclusive
216 or less
165 mm/sec
217 to 297 inclusive
Monochrome
298 to 381 inclusive
print
382 to 432 inclusive
B. Color OHP
• Different types of PPM control are provided according to the mode, regardless of the
interior temperature or the Pressure Roller surface temperature during the print cycle.
• The control does not cover the monochrome mode and any paper size other than A4 and
Letter.
Mode
OHP continuous paper feed mode
OHP + OHP Interleave mode *1
*1: PPM control is provided only when OHP transparencies are fed through the machine for
OHP + OHP Interleave.
96
Theory of Operation Ver. 1.0 Mar. 2005
Printed pages/min (PPM) when the Fusing Pressure Roller
temperature is decreased
Standard tempera-
ture
45
34
27
24
35
26
21
19
Printed pages/min (PPM) of A4 and Letter
8
5
135 °C or less 125 °C or less
40
30
24
21
31
23
18
17
36
27
21
19
28
21
17
15