Ricoh A151 Field Service Manual page 269

MAJOR DIFFERENCES BETWEEN THE A202/A203 AND
A151/A152.
The following table lists the major differences between the A202/A203 series
and the A151/A152 series. A "Model Cross Reference Table" can be found in
the Specifications Section of the service manual.
No. Item
Process Control
Grid Voltage for
Image Density
Control
1
Grid Voltage for
Toner
2
Drum Residual
Voltage (V
R
Detection and
3
Correction
Drum Wear
Correction
4
Optics
Optics Cooling
Fan
1
Development
Development
Bias Circuit
1
Toner Supply
Toner Supply
Mechanism
1
SM
A202/A203
Depends on the
Standard image density
grid voltage and the auto
image density factor.
Depends on the standard
ID sensor grid voltage.
The drum residual
) voltage (V ) detection
R
and drum residual
voltage (V ) correction
R
have been eliminated.
The drum wear
correction has been
eliminated,
The optics cooling fan is
installed for both A202
and A203 copiers.
The bias feed back circuit
is mounted inside the
power pack.
A toner supply motor is
used to add toner to the
development unit.
Depends on the factors
shown on the left, and
also the drum residual
voltage (V
factor.
Depends on the standard
ID sensor grid voltage
and the drum wear
correction factor.
The optics cooling fan is
installed on the A152
copier only.
The bias feed back signal
is sent from the power
pack to the main board to
control the development
bias voltage.
A toner supply clutch is
used to add toner to the
development unit.
1
A151/A152
) detection
R


A202/A203