i Confidential
PREFACE
This service reference manual contains basic information required for after-sales service of
the laser printer (hereinafter referred to as "the machine"). This information is vital to the
service personnel to maintain the high printing quality and performance of the machine.
This service reference manual covers the HL-4040CN/4040CDN/4050CDN/4070CDW
machines.
This manual consists of the following chapters:
REFERENCE 1: SPECIFICATIONS
Provides specifications of each model, which enables you to make a comparison of the
different models.
REFERENCE 2: THEORY OF OPERATION
Gives an overview of the printing mechanisms as well as the sensors, actuators, and
control electronics. It aids in understanding the basic principles of operations as well as
locating defects for troubleshooting.
APPENDIX 1: TONER CARTRIDGE WEIGHT INFORMATION
APPENDIX 2: REFERENCES
APPENDIX 3: GLOSSARY
Information in this manual is subject to change due to improvement or redesign of the
product. All relevant information in such cases will be supplied in service information
bulletins (Technical Information).
A thorough understanding of this machine, based on information in this service reference
manual and service information bulletins, is required for maintaining the print quality
performance and for improving the practical ability to find the cause of any problems.
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