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Epson 2200 Service Manual - Page 50

ASF Paper Feeding Operation

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EPSON Stylus PHOTO 2100/2200 2.2.3.3 ASF Paper Feeding Operation Using the driving force transmitted from the ASF/Pump motor via the DE mechanism, the ASF unit performs the following paper feeding operation. To achieve stable paper feeding operation of the paper feeding mechanism of this product, the double-feed prevention mechanism is installed in the ASF. To prevent paper from dropping into the paper path from the paper setting position in the ASF unit, the Paper return lever returns the paper to within the ASF hopper securely, and the LD roller then starts paper feeding operation. Refer to the following steps for details of the paper feeding operation including that of the double-feed prevention mechanism. 1. At power-on, the ASF/Pump motor rotates in the CCW direction and the ASF home position is detected. Then, the ASF/Pump motor rotates in the CW direction by the specified number of steps, thereby setting the LD roller and Paper return lever in the paper feeding standby position. Refer to [Standby status] in Figure 2-7, "Paper Feeding Operation". 2. When you give a paper feeding command from the PC and press the Paper switch on the panel, the ASF/Pump motor rotates in the CCW direction and the LD roller starts paper feeding. Refer to [Paper feeding status] in Figure 2-7, "Paper Feeding Operation". 3. When the paper is transferred from the ASF unit to the PF roller and detected by the PE sensor, the LD roller stops in the position where the friction of the LD roller is cleared. Refer to [PF roller passing status] in Figure 2-7, "Paper Feeding Operation". 4. Then when you give a print command and press the Paper switch on the panel, the ASF/Pump motor rotates in the CW direction by the specified number of steps, thereby setting the LD roller and Paper return lever in the paper feeding standby position. Refer to [Standby status] in Figure 2-7, "Paper Feeding Operation". LD roller Paper feed roller(Cam) Hopper spring 2 Revision B Pinch roller 3 Return lever Pad Pad spring [Standby status] [Paper feeding status] [PF roller passing status] Figure 2-7. Paper Feeding Operation OPERATING PRINCIPLES Printer Mechanism 50

Section	Page
FRONT MATTER	1
CONTENTS	6
CHAP 1-PRODUCTION DESCRIPTION	8
Overview	9
Basic Specifications	10
Specification Outline Comparison	10
Paper Specification	15
Printing Area	17
Ink Type-based Medium Compatibility Specifications	23
Release Lever	25
Functions	26
Control Panel	26
Switches	26
Indicators	26
Switch Functions	26
Default Setting Selection Function	28
Special Setting Mode Function	29
Status Printing	30
Panel Operation for Roll Paper Printing	31
Panel Operation for CD-R Printing	33
Panel Operation for Thick Paper Printing	33
Panel Operation in Roller Cleaning Mode	34
Indicator Display in Normal Mode	35
Error Status	36
Casing Specifications	37
Accessories	37
Environment Specification Items	38
CHAP 2-OPERATING PRINCIPLES	39
Overview	40
Printer Mechanism	40
Carriage Mechanism	41
Print Mode	44
Paper Feeding Mechanism	48
Paper Loading Mechanism	54
Ink System Mechanism	58
Ink Sequence	60
Paper Cutter Mechanism	63
Power-On Sequence	65
Electrical Circuitry Operating Principles	66
Power Supply Circuit Operating Principle	67
C387MAIN Circuit Operating Principle	68
CHAP 3-TROUBLESHOOTING	69
Overview	70
Error Indications and Fault Occurrence Causes	70
Troubleshooting	78
Superficial Phenomenon-Based Troubleshooting	104
EEPROM Data Analysis	114
CHAP 4-DISASSEMBLY AND ASSEMBLY	115
Overview	116
Precautions	116
Tools to Be Used	117
Screw List	118
Pre-Shipment Checks	119
Disassembly	120
Removing the Housings	121
Removing the Board Assembly	127
Removing the Waste Ink Pads	131
Removing the ASF Unit	132
Removing the Paper Eject Unit	140
Removing the Paper Eject Roller B	144
Removing the Printhead	146
Removing the Carriage Guide Shaft B	149
Removing the Carriage Guide Shaft A and Carriage Unit	152
Removing the Ink System Unit	158
Removing the Release Lever Shaft	159
Removing the Sensors	161
Removing the Motors	168
Removing the DE Unit and ASF/Pump Motor	171
Removing the PF Roller	175
Removing the Paper Eject Roller Shaft A	179
Removing the PF Roller Support	181
Disassembling the Cutter Unit	182
Fitting the Protective Materials	186
CHAP 5-ADJUSTMENT	187
Adjustment Items and Overview	188
Servicing Adjustment Item List	188
Priority of Adjustment Items	193
Replacement Part-Based Adjustment Priorities	194
Required Jigs, Tools and Like	196
Adjustments	197
Servicing Program Usage Outline	197
Head ID Input Function	199
CR motor drive torque dispersion measurement	199
PG Adjustment	200
Head Angular Adjustment	204
CR Tooth Skip Prevention Mechanism Adjustment	206
PF Adjustment	206
PW Sensor Adjustment	207
Bi-D Adjustment	208
Pixel Shift Adjustment	209
Cut Position Adjustment	210
USB ID Input	210
IEEE-1394 ID Input	211
First dot position adjsutment (Left/Right Margin Adjustment)	211
A3+ Photo Quality Ink Jet Paper 2 Print Pattern Printing Function	212
A4 Plain Paper print check pattern	213
CHAP 6-MAINTENANCE	214
Overview	215
ROM Replacement	215
Cleaning	215
Service Maintenance	216
Lubrication	217
CHAP 7-APPENDIX	226
Connector Summary	227
Connectors and Pin Layouts	227
EEPROM Address Map	231
Exploded Diagram	236
Parts List for EPSON Stylus Photo 2100	248

Match case Limit results 1 per page

EPSON Stylus PHOTO 2100/2200

Revision B

OPERATING PRINCIPLES

Printer Mechanism

2.2.3.3

ASF Paper Feeding Operation

Using the driving force transmitted from the ASF/Pump motor via the DE mechanism,

the ASF unit performs the following paper feeding operation.

To achieve stable paper feeding operation of the paper feeding mechanism of this

product, the double-feed prevention mechanism is installed in the ASF. To prevent

paper from dropping into the paper path from the paper setting position in the ASF

unit, the Paper return lever returns the paper to within the ASF hopper securely, and the

LD roller then starts paper feeding operation. Refer to the following steps for details of

the paper feeding operation including that of the double-feed prevention mechanism.

At power-on, the ASF/Pump motor rotates in the CCW direction and the ASF

home position is detected. Then, the ASF/Pump motor rotates in the CW direction

by the specified number of steps, thereby setting the LD roller and Paper return

lever in the paper feeding standby position. Refer to [Standby status] in Figure 2-7,

"Paper Feeding Operation".

When you give a paper feeding command from the PC and press the Paper switch

on the panel, the ASF/Pump motor rotates in the CCW direction and the LD roller

starts paper feeding. Refer to [Paper feeding status] in Figure 2-7, "Paper Feeding

Operation".

When the paper is transferred from the ASF unit to the PF roller and detected by

the PE sensor, the LD roller stops in the position where the friction of the LD roller

is cleared. Refer to [PF roller passing status] in Figure 2-7, "Paper Feeding

Operation".

Then when you give a print command and press the Paper switch on the panel, the

ASF/Pump motor rotates in the CW direction by the specified number of steps,

thereby setting the LD roller and Paper return lever in the paper feeding standby

position. Refer to [Standby status] in Figure 2-7, "Paper Feeding Operation".

Figure 2-7. Paper Feeding Operation

LD roller

Paper feed

roller(Cam)

Pad

Hopper spring

Return

lever

Pad spring

[Standby status]

[Paper feeding status] [PF roller passing status]

Pinch roller