Ricoh LDD250, Service Manual

Page: 431 / 459

PRINTING AND PRESSURE CYLINDER
SM 6-109 C262/C265
Detailed
Des
cription
s
6.9.9 PRINT PRESSURE ADJUSTMENT MECHANISM
Mechanism
The print pressure adjustment mechanism adjusts the print pressure to the correct
value for the current temperature and speed of printing. This is done to prevent
changes in image density.
The print pressure adjustment motor [A] turns the print pressure adjustment cams
[B]. The cams adjust the support springs [C] to change the print pressure.
There are 6 pressure settings, as shown below. The print pressure HP sensor [D]
detects the print pressure home position (this is pressure level 2). The print
pressure position sensor [E] detects the print pressure levels; to do this it monitors
the notches in the disk.
Very low
Less than
15ºC
Low
15
～
19 ºC
Normal
19
～
25 ºC
High
25 ～ 29 ºC
Very high
More than
29ºC
Trial 5 3 1 1 1
30 rpm 5 0 - - -
60 rpm 3 1 1 1 0
75 rpm 4 3 2 1 0
90 rpm 5 4 3 2 1
105 rpm 6 5 3 3 2
120 rpm 6 5 4 4 3
135 rpm 6 6 5 4 3
Printing pressure
6: Strongest, 0: Weakest
C262D107.WMF
[A]
[B]
[C]
[D]
[E]
[C]