Confidential
3 - 1 0
(2) Variation of OPC Belt Potential (See Fig.3-11.)
1) The OPC belt is initially biased to -CBV(V).
2) The OPC belt surface is evenly charged to V
0
(V) in the charging process.
3) The potential of the exposure part of the OPC belt is reduced to -VR(V) as it is exposed to
the laser beam in the process of exposing, and an electrostatic latent image is formed on
the OPC belt as the result.
4) Negatively charged toner is moved onto the exposed part of the OPC belt in the
development process due to the difference of potential between -VR(V) (the latent image)
and -DBV(V), and a visible toner image is formed as the result.
5) Negatively charged toner on the OPC belt moves to the transfer drum surface in the
transfer process because the GND potential of the transfer drum is greater than -VR(V) of
the OPC belt.
6) The OPC belt is discharged by the erase lamp.
-CBV
-CBV
-CBV
-CBV
-V0
-V0
-V0
-V0
-V0
-V0
-V0
-V0
-V0
-V0
brother
-V0
-V0
-V0
-V0
-V0
-V0
-V0
-V0
-V0
-CBV
-CBV
-CBV
-CBV
Charging
Laser Diode
Exposing
Blade
K Y M C
Developing
Transfer Belt
Erase Lamp
OPC Belt
-DBV
-CHV
-CBV
OV
OPC Belt Surface
-CBV
-V0
-VR
OPC Charger Roller PU
Dev Roller
-DBV
(M)TONER
-V0
-V0
-V0
-V0
-V0
-V0
-V0
-V0
Latent Image
Toner Image
brother
brother
Fig. 3-11
Summary of Contents for MFC-9420CN
Page 1: ...Confidential FACSIMILE EQUIPMENT SERVICE MANUAL MODELS MFC 9420CN ...
Page 16: ...Confidential CHAPTER 1 PARTS NAMES FUNCTIONS ...
Page 22: ...Confidential CHAPTER 2 SPECIFICATIONS ...
Page 33: ...Confidential CHAPTER 3 THEORY OF OPERATION ...
Page 48: ...Confidential 3 1 4 CBV DBV Fig 3 16 Y M C K Fig 3 17 ...
Page 69: ...Confidential 3 3 5 Fig 3 35 ...
Page 73: ...Confidential 3 3 9 3 Interface Circuit Printer side Fig 3 38 ...
Page 82: ...Confidential CHAPTER 4 TRANSFER OF DATA LEFT IN THE MACHINE TO BE SENT FOR REPAIR ...
Page 85: ...Confidential 4 2 Cover page sample End page sample Fig 4 1 ...
Page 86: ...Confidential CHAPTER 5 DISASSEMBLY REASSEMBLY AND LUBRICATION ...
Page 94: ...Confidential 5 5 5 1 1 AC Cord 1 Disconnect AC cord from the machine Fig 5 1 AC cord Machine ...
Page 175: ...Confidential CHAPTER 6 ADJUSTMENTS AND UPDATING OF SETTINGS REQUIRED AFTER PARTS REPLACEMENT ...
Page 203: ...Confidential CHAPTER 7 CLEANING ...
Page 205: ...Confidential CHAPTER 8 MAINTENANCE MODE ...
Page 213: ...8 6 Confidential Fig 8 2 Scanning Compensation Data List a b c d e f g h i j k l m n q ...
Page 224: ...8 17 Confidential Cover page sample End page sample Fig 8 8 ...
Page 255: ...Confidential CHAPTER 9 ERROR INDICATION AND TROUBLESHOOTING ...
Page 279: ...Confidential 9 23 2 Image failure 1 2 3 4 5 6 7 8 9 10 11 12 13 14 ...
Page 280: ...Confidential 9 24 15 a 15 b 16 17 18 19 20 21 22 23 24 25 Fig 9 1 ...
Page 325: ...App 1 5 Confidential 6 Transfer Unit X X X X X X 7 1 2 3 Location SERIAL NO YEAR MONTH DATE ...
Page 398: ...B Power Supply PCB 100V 127V Confidential ...