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V. Pick-up/feed System

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CHAPTER 2 V. PICK-UP/FEED SYSTEM A. Outline Presence of paper on the multi-purpose tray is detected by the multi-purpose tray paper sensor (PS1301), and presence of paper in the upper and lower cassettes is detected by the cassette paper-out sensor (PS1207 or PS1208). If the cassette pick-up motor (SMT1) in the paper pick-up unit rotates for cassette feeding, pick-up roller, feed roller 1, and separation roller turn to feed a sheet of paper into the printer. If the manual feed clutch (CL3) in the manual feed pick-up unit engages for manual feeding, the manual feeding pick-up roller turns and feeds a sheet of paper from the multi-purpose tray into the printer. The paper is controlled by the registration roller so that the leading edge of the toner image on the photosensitive drum matches the leading edge of the paper. The paper is fed, transferred, then separated from the drum, fed to the fixing unit, and delivered onto the face-up or face-down tray. There are four photointerrupters (PS1, PS2, PS1402, and PS1403) on the paper path for sensing paper reaching or passing through each area. If the paper does not reach or clear each sensor within the pre-set time, the microprocessor on the DC controller assumes a paper jam has occurred and notifies the video controller. 2 - 42

Section	Page
PREFACE	5
CONTENTS	7
CHAPTER 1	11
I. FEATURES	13
II. SPECIFICATIONS	15
III. SAFETY INFORMATION	19
IV. PARTS OF THE PRINTER	20
V. INSTALLATION	26
VI. MAINTENANCE AND SERVICING BY THE CUSTOMER	35
VII. OPERATION	37
CHAPTER 2	45
I. BASIC OPERATION	47
II. ENGINE CONTROL SYSTEM	50
III. LASER/SCANNER SYSTEM	72
IV. IMAGE FORMATION SYSTEM	78
V. PICK-UP/FEED SYSTEM	88
VI. OVERALL CONTROL SYSTEM	106
VII. OPTION CONTROL SYSTEM	110
VIII. ENVELOPE FEEDER	113
IX. DUPLEXING UNIT	117
X. PAPER DECK	127
CHAPTER 3	141
I. EXTERNALS	143
II. DRIVE SYSTEM	152
III. PAPER TRANSPORT SYSTEM	154
IV. EXPOSURE SYSTEM	163
V. ELECTROSTATIC IMAGING/DEVELOPING/CLEANING SYSTEM	164
VI. FIXING SYSTEM	166
VII. ELECTRONIC COMPONENTS	174
VIII. ENVELOPE FEEDER	181
IX. DUPLEXING UNIT	187
X. OPTION CONTROLLER	194
XI. PAPERDECK	195
CHAPTER 4	213
I. MAINTENANCE AND SERVICING	215
II. TOOLS	219
III. MEASUREMENT AND ADJUSTMENT	228
IV. INITIAL CHECK	232
V. IMAGE DEFECTS	233
VI. MALFUNCTION TROUBLESHOOTING	242
VII. PAPER FEEDING TROUBLESHOOTING	265
VIII. LOCATION OF ELECTRICAL PARTS/FUNCTION	272
IX.VARIABLE RESISTORS, LEDS, TEST PINS, JUMPERS, AND SWITCHES ON PC BOARDS	287
X. LIST OF LUBRICANTS, CLEANERS	296
APPENDIX	297
I. GENERAL TIMING CHART-1/2	299
GENERAL TIMING CHART-2/2	300
II. GENERAL CIRCUIT DIAGRAM-1/3	301
GENERAL CIRCUIT DIAGRAM-2/3	302
GENERAL CIRCUIT DIAGRAM-3/3	303

Match case Limit results 1 per page

V. PICK-UP/FEED SYSTEM

A. Outline

Presence of paper on the multi-purpose tray is detected by the multi-purpose tray paper sensor

(PS1301), and presence of paper in the upper and lower cassettes is detected by the cassette

paper-out sensor (PS1207 or PS1208).

If the cassette pick-up motor (SMT1) in the paper pick-up unit rotates for cassette feeding,

pick-up roller, feed roller 1, and separation roller turn to feed a sheet of paper into the printer.

If the manual feed clutch (CL3) in the manual feed pick-up unit engages for manual feeding,

the manual feeding pick-up roller turns and feeds a sheet of paper from the multi-purpose tray

into the printer.

The paper is controlled by the registration roller so that the leading edge of the toner image on

the photosensitive drum matches the leading edge of the paper.

The paper is fed, transferred,

then separated from the drum, fed to the fixing unit, and delivered onto the face-up or face-down

tray.

There are four photointerrupters (PS1, PS2, PS1402, and PS1403) on the paper path for

sensing paper reaching or passing through each area.

If the paper does not reach or clear each sensor within the pre-set time, the microprocessor on

the DC controller assumes a paper jam has occurred and notifies the video controller.

CHAPTER 2

2 - 42