Epson 4880 C Service Manual

EPSON Stylus Pro 4400/4450/4800/4880/4880CRevision COperating Principles Printer Mechanism Components 1312.2.4.3  Cutter Solenoid/CR Lock MechanismInstalled on the front of the Carriage Unit, this is a DC solenoid for controlling 
cutter pressure of the cutter used for roll paper cutting.
In addition, the CR Lock Mechanism is used jointly so that when the Carriage 
Unit moves from the printing area further to the right of the capping position 
(CR_Home), the lock activates to prevent Carriage Unit...

EPSON Stylus Pro 4400/4450/4800/4880/4880CRevision COperating Principles Printer Mechanism Components 132PAPER FEED MECHANISM DRIVE
Figure 2-26. Drive Transmission Path
Figure 2-27. Paper Feed Mechanism Drive LayoutFigure 2-28. Paper Feed Mechanism Drive Components
PF Motor
PF Timing Belt
Speed-Reduction Pulley
Sub Roller Drive PF Pulley
Sub Roller Drive Belt
Paper Eject Roller BeltPaper Eject Roller Pulley
Paper Eject Roller
PF Roller
Sub Roller Unit
Sub Roller Drive Pulley
Sub Roller 
Drive BeltSub...

EPSON Stylus Pro 4400/4450/4800/4880/4880CRevision COperating Principles Printer Mechanism Components 133 †PF Motor (DC motor)
With drive from the PF Motor, the grid of the loop scale installed above 
both PF Rollers is read by the Encoder Sensor, and feedback control is 
based on the output pulse. This control maintains high printing precision.
†Suction Fans
Suction Fans are mounted in the center inside the printer. This is designed 
to provide smooth paper feeding (prevents floating) by pulling the...

EPSON Stylus Pro 4400/4450/4800/4880/4880CRevision COperating Principles Printer Mechanism Components 134 †Rear Manual Insertion Sensor
This reverse tension switch sensor (mechanical contact) is mounted at the 
rear surface of the printer. The sensor detects paper being fed from the 
manual insertion slot.
Figure 2-30. Paper Feed Mechanism Sensors
2.2.5.1  ASF Paper Feed MechanismThis printer is equipped with an ASF Unit for feeding cut sheet paper. 
Operating principles of the ASF Unit are described...

EPSON Stylus Pro 4400/4450/4800/4880/4880CRevision COperating Principles Printer Mechanism Components 135ASF PAPER FEED MECHANISM DRIVE
Figure 2-32. Drive Transmission Path
Figure 2-33. ASF Paper Feed Mechanism Drive LayoutFigure 2-34. ASF Paper Feed Mechanism Drive Components
ASF/Pump Motor
Planetary Lever (Spur Gear, 15.2)
Combination Gear, 12, 22.4Combination Gear, 12.8, 36
Spur Gear, 33.6
ASF Unit (Spur Gear, 44.8)Combination Gear, 16.8, 24
Spur Gear, 25.6
Combination Gear, 16.8, 24ASF/Pump Motor...

EPSON Stylus Pro 4400/4450/4800/4880/4880CRevision COperating Principles Printer Mechanism Components 136TRANSMISSION OF DRIVE TO ASF UNIT
1. The DE Lock Lever is moved to the right end by moving the Carriage Unit 
to the right end of the Carriage Shaft.
Figure 2-35. Switching Drive Transmission Path (1)
2. The ASF/Pump Motor rotates by the required step number in the 
counterclockwise direction as seen from the Motor Pinion Gear side.
3. By rotation of the ASF/Pump Motor in the counterclockwise...

EPSON Stylus Pro 4400/4450/4800/4880/4880CRevision COperating Principles Printer Mechanism Components 137 †ASF/Pump Motor (Stepping motor)
When the transmission path is switched to the ASF Unit side by the 
Carriage Unit movement and DE Lock Lever, the ASF/Pump Motor can 
drive the LD Roller.
Movements of the ASF/Pump Motor drive transmission to the ASF Unit side 
are shown below.
Note : Rotation of the motor in the clockwise direction as seen from the Motor Pinion 
Gear is considered clockwise.The...

EPSON Stylus Pro 4400/4450/4800/4880/4880CRevision COperating Principles Printer Mechanism Components 138LIFTER MOVEMENT (RAISING THE HOPPER)
1. When a print command is received from the PC, the LD Roller which has 
been in standby condition first rotates to the paper feed side 
(counterclockwise) by the required step number and then rotates in the 
opposite direction from the paper feed side (clockwise) by the required 
step number to return any paper remaining between the LD Roller and the 
Separation...

EPSON Stylus Pro 4400/4450/4800/4880/4880CRevision COperating Principles Printer Mechanism Components 139 „Skew Correction Mode 2
1. The paper hits against the Gate Roller and Sub Roller. The Gate 
Roller and Sub Roller are stopped at this time.
2. Skew is corrected by the LD Roller pushing forward the unfed 
paper.
4. After feeding the paper, the LD Roller rotates in the counterclockwise 
direction and returns to the standby position.
5. The LD Roller in standby position then rotates in the clockwise...

EPSON Stylus Pro 4400/4450/4800/4880/4880CRevision COperating Principles Printer Mechanism Components 1402.2.6  Paper Eject/Release MechanismThis printer has a paper eject mechanism that switches eject according to the 
paper feed device and media used and has a release mechanism that applies 
pressure/release by the driven roller.
Operating principles of the eject mechanism and release mechanism are 
described below.2.2.6.1  Paper Eject MechanismPAPER MECHANISM DRIVE
Figure 2-38. Drive Transmission...