Confidential
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3. The laser beams reflected by the reflection mirror go straight toward the exposure drum below
it, then expose the exposure drum.
The area exposed to the laser beam is the image to be printed. The surface potential of the
exposed area is reduced, forming the electrostatic image to be printed.
Developing
Developing causes the toner to be attracted to the electrostatic image on the drum so as to
transform it into a visible image.
The developer consists of a non-magnetic toner. The developer roller is made of conductive
rubber and the supply roller (which is also made of conductive sponge) rotate against each other.
The toner is charged and carried from the supply roller to the developer roller. The toner adheres
to the developer roller and is conveyed to the exposure drum at an even thickness controlled by the
blade. The toner is nipped between the developer roller and the drum and developed onto the
latent image on the drum. The electrostatic field between the drum and the developer roller, which
is DC-biased from the high-voltage power supply, creates the electrostatic potential to attract toner
particles from the developer roller to the latent image area on the drum surface.
1 Cycle of drum
Surface
potential (V)
+897
+400
+150
Drum
sleeve
0
Time
1
2
3
(a)
(b)
1 Primary charging
2 Laser beam exposure and developing
3 Transfer the image to paper
(a) Unexposed area
(Non image area)
(b) Exposed area
(Image area)
Supply roller
Blade
Developer roller
Exposure drum
Corona wire
Transfer roller
Summary of Contents for DCP-7010
Page 1: ...Confidential FACSIMILE EQUIPMENT SERVICE MANUAL MODELS MFC7420 7820N DCP7010 7020 7025 ...
Page 14: ...Confidential CHAPTER 1 PARTS NAMES FUNCTIONS ...
Page 20: ...Confidential CHAPTER 2 SPECIFICATIONS ...
Page 44: ...Confidential CHAPTER 3 THEORY OF OPERATION ...
Page 64: ......
Page 65: ...Confidential CHAPTER 4 TRANSFER OF DATA LEFT IN THE MACHINE TO BE SENT FOR REPAIR ...
Page 68: ...Confidential 4 2 Cover page sample End page sample ...
Page 69: ...Confidential CHAPTER 5 DISASSEMBLY REASSEMBLY AND LUBRICATION ...
Page 150: ...Confidential CHAPTER 6 ADJUSTMENTS AND UPDATING OF SETTINGS REQUIRED AFTER PARTS REPLACEMENT ...
Page 154: ...Confidential CHAPTER 7 CLEANING ...
Page 156: ...Confidential CHAPTER 8 MAINTENANCE MODE ...
Page 164: ...8 7 Confidential Scanning Compensation Data List a b c d e f g h i j k l m n q ...
Page 172: ...8 15 Confidential Configuration List ...
Page 178: ...8 21 Confidential Cover page sample End page sample ...
Page 187: ...Confidential CHAPTER 9 ERROR INDICATION AND TROUBLESHOOTING ...
Page 321: ...A NCU PCB MFC7420 U S A and CANADA models Confidential ...
Page 322: ...A NCU PCB MFC7820N U S A and CANADA models Confidential ...
Page 323: ...A NCU PCB MFC7420 EUROPE models Confidential ...
Page 324: ...A NCU PCB MFC7820N EUROPE models Confidential ...
Page 325: ...B Power Supply PCB 100V U S A and CANADA models Confidential ...
Page 326: ...B Power Supply PCB 200V EUROPE models Confidential ...
Page 327: ...December 04 SM FAX036 2 8C5A03 Printed in Japan ...