Ricoh Aficio FT4027, Service Manual

Page: 497 / 685

SM A207/A208/A211 2
No.
Item
(Section to refer to in
the Service Manual)
(A204/A206/A207/
A208/A210/A211)
(A153/A155/A156/
A157/A159/A160)
6 Temperature
Correction
(formally known as the
T/H correction) The elastic gum layer resistance
has been changed. Compared
from the base copiers drum
charge roller, the new charge
roller's elastic gum layer
resistance is smaller, meaning
that the change of resistance
with temperature is less. So at
low temperatures, this new drum
charge roller's charge efficiency
does not decrease, and it is the
same level as for the base
copier at normal temperatures.
This is why the drum rotation
time correction is longer
necessary, as this correction
was applied only at low
temperatures. Pg 1-23 Both the temperature and the
drum rotation time are monitored
to apply corrections to the drum
charge roller during copying and
when making a ID sensor
pattern. Pg 2-24
7 Toner End Recovery The toner end recovery
detection timing has been
changed to eliminate
mis-detection. The toner supply
is divided into two 5second
periods. After each toner supply
period, there is a 2 second
period for toner detection. This
will reduce the chances of a
mis-detection. Pg 1-25 The toner supply and detection
is performed continuously for 10
seconds. Pg 2-60