Epson C 2900 Manual

							5 - 42 Chapter 5   Parts List
Epson AcuLaser C2900NRevision B
Confidential
PL12.4 250 Feeder (Option) (4/5) [Illustration]
MiS05018SA
27
E2
ST2
E2
E2
E2
E1
2
3
5
1 (with 2-13,16,20-27,29-33)
6
78
9
10
11
12
13 31
13
21 16
171819
22
23 33
24 26
25 2029
30
(P4202)
(P4212)
Tray2 NO PAPER
SENSOR PAPER PAHT
SENSOR
32 (with 17-19)
3
4 
						

							5 - 43 Chapter 5   Parts List
Epson AcuLaser C2900NRevision B
Confidential
PL12.4 250 Feeder (Option) (4/5) [List]
Item Parts name
1 CHUTE ASSY TURN (with 2-13,16,20-27,29-33)
2 SHAFT ASSY FEED [Same as PL3.2.2]
3 ROLL CORE MSI [Same as PL3.2.3]
4 ROLL ASSY FEED [Same as PL3.2.4]
5 BEARING EARTH [Same as PL3.2.5]
6 ACTUATOR REGI OUT [Same as PL3.2.6]
7 SPRING REGI OUT [Same as PL3.2.7]
8 ACTUATOR REGI ROLL
9 ROLL ASSY REGI
10 ROLL REGI METAL [Same as PL3.2.10]
11 ACTUATOR REGI IN
12 SPRING ACT REGI [Same as PL3.2.12]
13 SENSOR PHOTO [Same as PL3.2.13]
14 - -
15 - -
16 SPRING STP [Same as PL3.2.16]
17 STOPPER ACT [Same as PL3.2.17]
18 SPRING ACT NP [Same as PL3.2.18]
19 ACTUATOR NO PAPER [Same as PL3.2.19]
20 BEARING M EARTH [Same as PL3.2.20]
21 BEARING EARTH REGI [Same as PL3.2.21]
22 GEAR REGI R [Same as PL3.2.22]
23 GEAR REGI M [Same as PL3.2.23]
24 SPRING REGI R M
25 PLATE EARTH REGI [Same as PL3.2.25]
26 CHUTE UP [Same as PL3.2.26]
27 CHUTE LOW
28 - -
29 SPRING REGI L M
30 BEARING M [Same as PL3.2.30]
31 BEARING R [Same as PL3.2.31]
32 ACTUATOR ASSY NO PAPER (with 17-19) [Same as PL3.2.32]
33 PLATE WEIGHT [Same as PL3.2.33] 
						

							5 - 44 Chapter 5   Parts List
Epson AcuLaser C2900NRevision B
Confidential
PL12.5 250 Feeder (Option) (5/5) [Illustration]
MiS05019SA
2
3
4
56
7
1617
18 8
19
15 16 14
21 (with 2-8,14-18)
1 (with 19,21) 
						

							5 - 45 Chapter 5   Parts List
Epson AcuLaser C2900NRevision B
Confidential
PL12.5 250 Feeder (Option) (5/5) [List]
Item Parts name
1 CASSETTE ASSY 250 OPT (with 19,21)
2 PLATE ASSY BOTTOM [Same as PL2.1.2]
3 SPRING N/F L [Same as PL2.1.3]
4 SPRING N/F R [Same as PL2.1.4]
5 HOLDER ASSY RETARD [Same as PL2.1.5]
6 GUIDE SIDE L [Same as PL2.1.6]
7 GEAR PINION [Same as PL2.1.7]
8 GUIDE SIDE ASSY R [Same as PL2.1.8]
9- -
10 - -
11 - -
12 - -
13 - -
14 LATCH BOTTOM L [Same as PL2.1.14]
15 LATCH BOTTOM R [Same as PL2.1.15]
16 SPRING LATCH B [Same as PL2.1.16]
17 TRAY ASSY EXTENSION [Same as PL2.1.17]
18 HOUSING CASSETTE 250 [Same as PL2.1.18]
19 HANDLE ASSY CST OPT
20 - -
21 TRAY ASSY CST 250 (with 2-8,14-18) [Same as PL2.1.21] 
						

							Confidential
CHAPTER
6
Principles of Operation 
						

							Chapter 6  Principles of Operation
Chapter 6  Principles of Operation  CONTENTS
Epson AcuLaser C2900N Confidential
1. Printing Process .......................................................................................................... 6 - 1
1.1 Summary of Printing Process ........................................................................................................... 6 - 1
1.2 Schematic Diagram for Printing Processes ...................................................................................... 6 - 2
1.3 Description of Printing Process Techniques ..................................................................................... 6 - 3
1.3.1 Charge ...................................................................................................................................... 6 - 3
1.3.2 Exposure ................................................................................................................................... 6 - 4
1.3.3 Development ............................................................................................................................. 6 - 6
1.3.4 Transfer (Drum to Paper) .......................................................................................................... 6 - 9
1.3.5 Cleaning (DRUM).................................................................................................................... 6 - 11
1.3.6 Fusing ..................................................................................................................................... 6 - 12
1.3.7 Cleaning (Transfer ASSY) ...................................................................................................... 6 - 13
1.3.8 Waste Toner Collection........................................................................................................... 6 - 14
2. Paper Path................................................................................................................. 6 - 15
2.1 Paper Path ...................................................................................................................................... 6 - 15
2.2 Layout of Paper Path ...................................................................................................................... 6 - 16
2.3 Feeding from Paper Tray ................................................................................................................ 6 - 17
2.3.1 Multiple Sheet Feed Prevention .............................................................................................. 6 - 18
2.4 Feeding from Single Sheet Inserter (SSI) ....................................................................................... 6 - 19
2.5 Feeding in Registration Section ...................................................................................................... 6 - 20
2.5.1 Lead-edge Registration........................................................................................................... 6 - 21
2.6 Transfer/Fusing/Exit ........................................................................................................................ 6 - 22
2.7 Feeding in Duplex Section .............................................................................................................. 6 - 23
3. Functions of Major Functional Components .............................................................. 6 - 24
3.1 Paper Tray ...................................................................................................................................... 6 - 24
3.1.1 Major functions........................................................................................................................ 6 - 24
3.2 Paper Feeder .................................................................................................................................. 6 - 26
3.2.1 Major functions........................................................................................................................ 6 - 26
3.3 SSI & Regi Assy.............................................................................................................................. 6 - 28
3.3.1 Control of paper size ............................................................................................................... 6 - 31
3.3.2 Paper detection by the Regi Sensor .......................................................................................6 - 31
3.4 Transfer Belt & Fuser Unit .............................................................................................................. 6 - 32
3.4.1 Major functions........................................................................................................................ 6 - 32
3.5 ROS ASSY...................................................................................................................................... 6 - 34
3.5.1 Major functions........................................................................................................................ 6 - 34
3.6 TONER CARTRIDGE & DISPENSER ............................................................................................ 6 - 36
3.6.1 Major functions........................................................................................................................ 6 - 36
3.7 Drum Cartridge ............................................................................................................................... 6 - 37
3.7.1 Major functions........................................................................................................................ 6 - 37
3.8 Drive................................................................................................................................................ 6 - 39
3.8.1 Major functions........................................................................................................................ 6 - 39
3.9 Electrical ......................................................................................................................................... 6 - 42
3.9.1 Major functions........................................................................................................................ 6 - 42
3.9.2 Data Flow ................................................................................................................................ 6 - 44
3.10 Duplex ........................................................................................................................................... 6 - 45
3.10.1 Major functions...................................................................................................................... 6 - 45 
						

							Chapter 6  Principles of Operation
Chapter 6  Principles of Operation  CONTENTS
Epson AcuLaser C2900N Confidential3.11 250 Paper Tray ............................................................................................................................. 6 - 46
3.11.1 Major functions 250 Paper Tray ............................................................................................ 6 - 46
3.11.2 Major functions (Paper Feeder) ............................................................................................ 6 - 47
4. Operation Modes ....................................................................................................... 6 - 49
4.1 Operation Modes ............................................................................................................................ 6 - 49
5. Control ....................................................................................................................... 6 - 50
5.1 Control of Paper Size ...................................................................................................................... 6 - 50
5.2 ROS Light Quantity Control ............................................................................................................ 6 - 50
5.3 Process Control .............................................................................................................................. 6 - 51
5.3.1 Potential Control ..................................................................................................................... 6 - 51
5.3.2 Toner Density Control ............................................................................................................. 6 - 52
5.3.3 High Area Coverage Mode ..................................................................................................... 6 - 52
5.3.4 Admix Mode ............................................................................................................................ 6 - 52
5.3.5 ADC Sensor Adjustment ......................................................................................................... 6 - 52
5.4 Color Registration Control............................................................................................................... 6 - 53
5.5 Fuser Unit Control ........................................................................................................................... 6 - 54
5.5.1 Fuser Unit temperature control ............................................................................................... 6 - 54
5.5.2 Cooling down .......................................................................................................................... 6 - 54
5.5.3 Sensor Warm-up ..................................................................................................................... 6 - 54
6. Drive Transmission Route ......................................................................................... 6 - 55
6.1 DRIVE ASSY MAIN ........................................................................................................................ 6 - 55
6.2 DRIVE ASSY MAIN and DRIVE ASSY SUB DRIVE ...................................................................... 6 - 58
6.3 TONER DISPENSER (Y, M, C, K).................................................................................................. 6 - 63
6.4 DRIVE ASSY SUB .......................................................................................................................... 6 - 65
6.5 DRIVE ASSY DUP .......................................................................................................................... 6 - 69
6.6 MOTOR ASSY SUB........................................................................................................................ 6 - 71 
						

							6 - 1 Chapter 6   Principles of Operation
Epson AcuLaser C2900NRevision B
Confidential
1. Printing Process
1.1 Summary of Printing Process
This printer is a Full-color laser printer which applies the principle of an electrophotographic recording 
system. The tandem system comprising the four color photoconductor drum of yellow, magenta, cyan 
and black (Y, M, C and K) creates the toner image.
Printing processes of this printer is composed of the basic steps as follows.
(1) Charge: ............................. Drum surface is charged with electricity.
(2) Exposure: ......................... Image unit is exposed to laser beams.
(3) Development: ................... Image is developed with toner.
(4) Transfer: ........................... Four-color finished toner image on the Drum is transferred onto the 
paper.
(5) Cleaning: .......................... Remaining toner on the drum is collected.
(6) Fusing: .............................. Toner on the paper is fixed by heat and pressure.
(7) Cleaning: .......................... Remaining toner on the belt is collected.
MiS06001SA
to Transfer ASSY Drum Cartridge 
						

							6 - 2 Chapter 6   Principles of Operation
Epson AcuLaser C2900NRevision B
Confidential
1.2 Schematic Diagram for Printing Processes
Outline of printing processes is shown in the figure below.
MiS06002SA
ROS
[(2)Exposure]Drum Cartridge
[(1)Charge]
[(3)Development]
[(4)Transfer]
[(5)Cleaning]
FUSER UNIT
[(6)Fusing]
Transfer ASSY
[(4)Transfer]
[(7)Cleaning]: 
Laser beam
: Paper transfer 
						

							6 - 3 Chapter 6   Principles of Operation
Epson AcuLaser C2900NRevision B
Confidential
1.3 Description of Printing Process Techniques
1.3.1 Charge
In the charging process, the drum surface rotating at a constant speed is charged uniformly with nega-
tive electricity by the discharge from BCR (Bias Charge Roll).
This process is performed in parallel for yellow, magenta, cyan and black colors.
- BCR (Bias Charge Roll)
The BCR is kept in contact with the drum and rotates following the rotations of the drum. The BCR 
is a conductive roll that uniformly and negatively charges the drum surface with the negative volt-
age applied by the HVPS.
-Drum
The drum surface is uniformly and negatively charged with DC bias voltage.
The drum surface consists of a photoreceptor (which is an insulator in the dark and a conductor in 
the light) backed with a conductor.
- Cleaning Roll
The Cleaning Roll contacts with the BCR to remove the toner from it.
Wsb06003KA
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