Ricoh SAVIN D0AP Service Manual page 621

CPM Down Control
This machine employs several CPM down modes to maintain the quality of printed images and
to optimize and protect the operation of the machine
High-Temperature CPM Down
When paper narrower than the width of the heated surface of the hot roller passes through the
fusing unit, the amount of unabsorbed heat at the ends of the hot roller causes the fusing unit to
become abnormally hot. As soon as the machine detects such a rise in temperature, it will lower
throughput and then regulate the high temperature inside the fusing unit.
After printing continuously more than 60 seconds, the fusing thermistor (TH1) starts to check
the temperature at one-second intervals. Based on these temperature readings the machine
will determine the appropriate CPM down level. The CPM down levels are described below.
Level
Large Size Paper
(Feed Edge>182mm)
35 ppm
Normal 100%
CPM Down 1 100%
CPM Down 2 100%
CPM Down 3 23%
Low-Temperature CPM Down
SM
CPM Down Rate
Medium Size Paper
(148<Feed Edge<182mm)
43 ppm 35 ppm
100%
85%
70%
28% 23%
7-59
Small Size Paper
(Feed Edge<148mm)
43 ppm 35 ppm
100%
80%
60%
28% 23%
D0AP/D0C4/D0C5/D0C6/M0BQ/M0D1
Image Fusing
43 ppm
28%