Brother International HL-720 Service Manual - Page 3

Preface, I, Features And Specifications, Theory Of Operation, Disassembly And Reassembly - laser printer

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PREFACE This service manual contains basic information required for after-sales service of the laser printer (here-after referred to as "this machine" or "the printer"). This information is vital to the service technical in maintaining the high print quality and performance of the printer. This service manual covers both HL-720 and HL-730/730Plus. This manual consists of the following chapters: CHAPTER I: FEATURES AND SPECIFICATIONS Features, specifications, etc. CHAPTER II: THEORY OF OPERATION Basic operation of the mechanical system, the electrical system and the electrical circuit, and their timing. CHAPTER III: DISASSEMBLY AND REASSEMBLY Procedures of disassembling and reassembling the mechanical system. CHAPTER IV: TROUBLESHOOTING Reference values and adjustments, troubleshooting for image defects, troubleshooting for malfunctions, etc. APPENDICES: Connection diagrams, PCB circuit diagrams. Note: There are each captions for HL-720 and HL-730/730Plus to divide this manual according to the contents. You can fin the captions under the headings. Please pay attention to them On the other hand, the headings have no captions that means the contents are common to HL720 and HL-730/730Plus. Information in this manual is subject to change due to improvement or re-design of the product. All relevant information in such cases will be supplied in service information bulletins (Technical Information). A thorough understanding of this printer, based on information in this service manual and service information bulletins, is required for maintaining its quality performance and for fostering the practical ability to find the cause of problems.

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PREFACE
This service manual contains basic information required for after-sales service of the laser printer
(here-after referred to as "this machine" or "the printer"). This information is vital to the service
technical in maintaining the high print quality and performance of the printer.
This service manual covers both HL-720 and HL-730/730Plus.
This manual consists of the following chapters:
CHAPTER I:
FEATURES AND SPECIFICATIONS
Features, specifications, etc.
CHAPTER II:
THEORY OF OPERATION
Basic operation of the mechanical system, the electrical system and the electrical
circuit, and their timing.
CHAPTER III:
DISASSEMBLY AND REASSEMBLY
Procedures of disassembling and reassembling the mechanical system.
CHAPTER IV:
TROUBLESHOOTING
Reference values and adjustments, troubleshooting for image defects,
troubleshooting for malfunctions, etc.
APPENDICES:
Connection diagrams, PCB circuit diagrams.
Note:
There are each captions for HL-720 and HL-730/730Plus to divide this manual according to
the contents. You can fin the captions under the headings. Please pay attention to them On
the other hand, the headings have no captions that means the contents are common to HL-
720 and HL-730/730Plus.
Information in this manual is subject to change due to improvement or re-design of the product. All
relevant information in such cases will be supplied in service information bulletins (Technical
Information).
A thorough understanding of this printer, based on information in this service manual and service
information bulletins, is required for maintaining its quality performance and for fostering the practical
ability to find the cause of problems.