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Canon LBP 2460 Service Manual - Page 124

Second Feed Pick-up System

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CHAPTER 2 4. Second Feed Pick-up System On completion of the side registration adjustment, the CPU turns ON the duplex feed clutch (CL21). The CPU turns OFF CL21 approx. 1.0 second (1.9 seconds for wide and narrow paper types) after detecting the leading edge of the paper at the duplexing unit paper sensor (PS21). The CPU then stops the paper at the second-pass pick-up wait position and waits for second-pass pick-up command to be input from the printer. On receival of these commands the CPU controls the feeding speed of the switchback motor (SMT21) according to the paper feed speed of the printer. Following this CL21 is turned ON and the paper is fed into the printer. 2 - 78

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

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CHAPTER 2

2 - 78

Second Feed Pick-up System

On completion of the side registration adjustment, the CPU turns ON the duplex feed clutch

(CL21).

The CPU turns OFF CL21 approx. 1.0 second (1.9 seconds for wide and narrow paper

types) after detecting the leading edge of the paper at the duplexing unit paper sensor (PS21).

The CPU then stops the paper at the second-pass pick-up wait position and waits for second-pass

pick-up command to be input from the printer.

On receival of these commands the CPU controls the feeding speed of the switchback motor

(SMT21) according to the paper feed speed of the printer.

Following this CL21 is turned ON and

the paper is fed into the printer.