Service manual

EPSON Stylus COLOR 480 Revision B
Operating Principles Overview 36
2.1.4 Paper Feeding Mechanism
The paper feeding mechanism consists of Paper feed motor (PF motor), PF roller,
Paper eject roller, Star wheel roller, and so on. The paper feeding mechanism feeds
paper loaded from ASF using the PF roller and Paper Eject Roller & Star wheel roller.
For this mechanism, the PF motor mentioned in the right Table 2-2 is used on this
product.
The drive of the PF motor is transfer to the PF roller and the Paper Eject Roller as
following Figure 2-7. Following shows you how to transfer the PF motor drive to the
PF roller and the Paper Eject Roller.
o PF motor drive transmission path
PF Motor Pinion Gear (CW) → Combination Gear 8.4, 21.6 (CCW) → Combination Gear
9.6, 33.6(CW)
→ Spur Gear 15 (PF roller)(CCW) → Spur Gear 34.2 (CW) → Spur gear 15
(CCW)
Table 2-2. PF Motor Specifications
Figure 2-7. Paper Feeding Mechanism
Paper loaded from ASF is advanced by the following roller.
o Paper feed roller & Paper guide roller (assembled on the Top Frame) → Paper
eject roller & Star wheel roller (assembled on the Paper eject frame).
Additionally, the top & end of the paper is detected with the HP/PE/IC sensor.
In case the PE sensor dose not detect the paper in the paper loading sequence, the
printer detects the “Paper out error”. If the paper is detected after complete the paper
eject sequence, the printer detects the “Paper jam error”.
Item Description
Motor type 4-Phase/ 48-Pole PM Stepping motor
Drive voltage +42 V +/ - 5% (DRV IC voltage)
Coil Resistance 10 Ω +/ - 10% (per phase)
Inductance 10.5 mH +/ - 20%(1kH 1Vrms)
Driving method Bi-Polar drive
Driver IC LB1845
Top view
Paper Eject RollerPaper Feed Roller
PF Motor
Right side view
HP/PE/IC Sensor
Spur Gear 15
(PF Roller)
Combination
Gear 12.6, 18.4
Spur Gear 15.2
Spur Gear 34.2
Combination Gear 9.6,33.6
Combination Gear 8.4, 21.6
PF Pinion Gear
Change
Lever
Spur Gear 35.2
Combination
Gear 22.4, 32
Combination Gear 11.2, 32.4
Star Wheel
Spur Gear 15
Paper Guide
Roller
Non paper
Feeding Paper
PE Sensor Lever
Paper
HP/PE/IC
Sensor
Low signal High signal