Paper Feed Mechanism; Pf Motor Specifications; Pf Encoder - Epson Stylus Photo RX700 Service Manual

EPSON Stylus Photo RX700

2.2.4 Paper Feed Mechanism

The paper feed mechanism, consisting primarily of the PF Motor, PF Roller Assy and
Paper Eject Rollers (x2), transports the paper from the paper loading mechanism and
ejects it to the front.

2.2.4.1 PF Motor Specifications

Item
Type DC brush motor
Voltage 42 V (DC voltage) ± 5% (voltage applied to the driver)
Armature
26.4Ω ± 10%
resistance
Characteristics
Inductance 16.7mH (1KHz)
Inertia 12.4 gcm
Drive system PWM system, constant-current chopping system
Paper feed direction
Paper Feed Direction Direction of Motor Rotation
Normal
Reverse

2.2.4.2 PF Encoder

Detector specifications
Item
Detection method (SHARP GP1A038CKL)
Supply
3.3 VDC ± 5%
Electrical
voltage
characteristics
Current 16 mA (40 mA MAX) 120Ω
Output waveform Phase A and phase B 2-channel digital output (TTL)
"H" 2.4 V DC min.
Output level
"L" 0.4 V DC max
Resolution 1/180 pulse/inch
Signal detecting element Photo interrupter
Duty ratio 50% ± 20%
Output phase difference 90° ± 54°
Frequency response 20kHz
Operating Principles
Specifications
2
Current
→
CW PF-A PF-B
→
CCW PF-B PF-A
Specifications
Mechanism Operating Principles
CD-R Sensor 1
Detects the position (PG++) of the
Upper Paper Guides
When the Upper Paper
Guides have been
located at the PG++
position, the actuator
moves and the sensor
detects the position.
Upper Paper Guides
Idle Roller Shaft Assy
PF Motor
PF Encoder
PF Roller Assy
Front Paper Eject Roller Shaft
Figure 2-14. Components of Paper Feed Mechanism
Revision A
PE Sensor
Detects the presence of paper.
EJ Frame Assy
PF Roller Holder Support Assy
Rear Paper Eject Roller Shaft
26