20-6.Cpm Control - Minolta Di450 Service Manual

20-6. CPM Control
The CPM (copies/minute) control is provided to keep good fusing performance even in
multi-copy cycles and with the system power sourced from a single power outlet.
1. Overview
The Fusing Roller surface temperature goes down in a multi-copy cycle, resulting in
degraded fusing performance.
↓
CPM is decreased.
↓
A greater interval results between sheets of paper, which gives time for the Fusing Roller
surface temperature to increase and recovers good fusing performance.
↓
The normal CPM is set again.
2. Details
• During the CPM control, the copier provides a greater interval between scan motions and
between sheets of paper, with the system speed remaining unchanged.
• The CPM control is usually activated if a multi-copy cycle is run immediately after the
power has been turned ON in the morning when the Fusing Rollers remain cool.
• In times other than early morning, the Fusing Roller is heated from the inside and, even
with a multi-copy cycle run, the CPM control is not readily activated.
• It can, however, be activated even at times other than early morning, when heavyweight
2
(g/m ) paper or large-size paper is used.
Normal
45 or 55 copies/minute
Multi-Copy Cycle Immediately After Warm-Up in Early morning.
Start Key ON
(°C)
190
180
140
0
Paper Size
A4C
CPM Control (40 copies/minute)
Normal CPM
Changes in Upper Fusing Roller Surface Temperature
Changes in Lower Fusing Roller Surface Temperature
Multi-Copy Cycle
M-75
CPM Control
40 copies/minute
Copy Cycle Completed
4002M602AA
(Time)