EPSON Stylus Photo R1900/R2880/R2000/R2000s/SC-P400 Series Revision I
Operating Principles Overview 31
2.1 Overview
This chapter explains the operating principles of the mechanical sections and electrical
circuits in this product. The main components of this product are as follows.
Control circuit board : C698 MAIN
Power supply circuit board : C698 PSB/PSE
Control panel board : C698 PNL
LED board : C698 PNL-B
2.2 Printer Mechanism
Like the conventional model, this product uses DC motors and stepping motors as
power sources. The following table describes the motor types and their applications.
The basic mechanism is almost same as the Stylus Photo R1800.
The schematic diagram below shows the printer mechanism.
Figure 2-1. Printer Mechanism Outline
Table 2-1. Motors
Motor Name Type Applications/Functions
CR Motor
DC motor with
brushes
Used for carriage driving. Makes little noise during
driving. The CR linear scale and CR encoder sensor
are used to control the motor.
PF Motor
DC motor with
brushes
Drives the Paper loading rollers at the time of fixed-
value paper loading or paper feed/eject operation. To
grasp the paper feed pitch, the precision gear surface
is fitted with the PF scale and the PF encoder sensor
is used to control the motor.
APG Motor
DC motor with
brushes
Drives the Carriage Unit at the time of PG setting.
The two APG Sensors are driven vertically to control
the motor.
ASF Motor
4-phase, 48-pole
PM type stepping
motor
Drives the paper feed operation of the ASF. Since
this is a stepping motor, any scales or photo sensors
to know the driving conditions are not required.
Pump Motor
4-phase, 48-pole
PM type stepping
motor
Drives the pump, wiper, etc. of the Ink System. Since
this is a stepping motor, any scales or photo sensors
to know the driving conditions are not required.
Rear Paper
Eject Roller
Front Paper
Eject Roller
Ink Mark
Sensor
PW Sensor
CR Scale
PF Roller
PF Encoder
Sensor
PF Scale
PF Motor
Carriage
Unit
Ink System
Unit
Pump Motor
CD-R Sensor
Carriage
Shaft
APG Sensors
APG Motor
APF Sensor
Timing Belt
CR Encoder
Sensor
LD Roller
Retard
Roller
PE Sensor
ASF Motor
CR Motor
PF Roller
Cover Open
Sensor
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