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Canon LBP 2460 Service Manual - Page 242

VI. MALFUNCTION TROUBLESHOOTING, not causing a faulty connection.

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CHAPTER 4 VI. MALFUNCTION TROUBLESHOOTING The printer driver tester is necessary for executing the malfunction troubleshooting outlined in this section. It is used to monitor failures of the printer, sensor and actuator operations. When performing the corrective actions described below, the following precautions should be taken; • when measuring the voltage at a specified terminal of a connector, check that the connector is not causing a faulty connection. • before handling PCBs, be sure to touch a metal part of the printer to discharge static energy, as it can cause damage to the PCBs. • the laser/scanner unit cannot be adjusted in the field, so do not attempt to disassemble it. Prepare the printer driver tester for executing the troubleshooting malfunctions described in this section. 4 - 28

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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VI. MALFUNCTION TROUBLESHOOTING

The printer driver tester is necessary for executing the malfunction troubleshooting outlined in

this section.

It is used to monitor failures of the printer, sensor and actuator operations.

When

performing the corrective actions described below, the following precautions should be taken;

•

when measuring the voltage at a specified terminal of a connector, check that the connector is

not causing a faulty connection.

•

before handling PCBs, be sure to touch a metal part of the printer to discharge static energy,

as it can cause damage to the PCBs.

•

the laser/scanner unit cannot be adjusted in the field, so do not attempt to disassemble it.

Prepare the printer driver tester for executing the troubleshooting malfunctions described in

this section.

CHAPTER 4

4 - 28