Confidential
9-48
I-24
Uneven Density (Right & Left)
Phenomenon
The optical density is different between the right and left side of the printed image.
Main Causes
(1) The amount of toner in the toner cartridge PU is short.
(2) The retract operation of the toner cartridge PU is not properly done.
(3) The belt of the toner cartridge PU is deformed.
(4) The belt of the transfer unit is deformed.
(5) The transfer roller ASSY PU is not properly installed.
(6) The back cover ASSY PU is deformed.
(7) The back cover ASSY PU is not locked sufficiently
(8) The dustproof glass of laser ASSY PU is stained.
Fig. 9-24
Countermeasures
(1) Replace the toner cartridge PU.
(2) Check the toner retract clutch PU.
(3) Replace the belt cartridge PU.
(4) Confirm the proper installation of the transfer roller ASSY PU.
(5) Replace the transfer roller ASSY PU.
(6) Ensure to lock the back cover ASSY PU.
(7) Replace the back cover ASSY PU.
(8) Clean the laser ASSY PU.
(9) Replace the laser ASSY PU.
Toner cartridge PU
(K, Y, M, C)
Laser ASSY PU
Belt cartridge PU
Transfer unit PU
Transfer belt
Back cover ASSY PU
Содержание MFC-9420CN
Страница 1: ...Confidential FACSIMILE EQUIPMENT SERVICE MANUAL MODELS MFC 9420CN ...
Страница 16: ...Confidential CHAPTER 1 PARTS NAMES FUNCTIONS ...
Страница 22: ...Confidential CHAPTER 2 SPECIFICATIONS ...
Страница 33: ...Confidential CHAPTER 3 THEORY OF OPERATION ...
Страница 48: ...Confidential 3 1 4 CBV DBV Fig 3 16 Y M C K Fig 3 17 ...
Страница 69: ...Confidential 3 3 5 Fig 3 35 ...
Страница 73: ...Confidential 3 3 9 3 Interface Circuit Printer side Fig 3 38 ...
Страница 82: ...Confidential CHAPTER 4 TRANSFER OF DATA LEFT IN THE MACHINE TO BE SENT FOR REPAIR ...
Страница 85: ...Confidential 4 2 Cover page sample End page sample Fig 4 1 ...
Страница 86: ...Confidential CHAPTER 5 DISASSEMBLY REASSEMBLY AND LUBRICATION ...
Страница 94: ...Confidential 5 5 5 1 1 AC Cord 1 Disconnect AC cord from the machine Fig 5 1 AC cord Machine ...
Страница 100: ...Confidential 5 11 5 1 5 Side Cover LR 1 Remove the screw and then remove the side cover LR Fig 5 8 Side cover LR Screw ...
Страница 172: ...Confidential 5 83 CIS unit 2 Side cover L Hole Main PCB CIS unit CIS flat cable Document scanner Insert ...
Страница 173: ...Confidential 5 84 FB motor 3 Side cover L Hole Hole Main PCB Document scanner FB motor FB motor harness Insert ...
Страница 175: ...Confidential CHAPTER 6 ADJUSTMENTS AND UPDATING OF SETTINGS REQUIRED AFTER PARTS REPLACEMENT ...
Страница 203: ...Confidential CHAPTER 7 CLEANING ...
Страница 205: ...Confidential CHAPTER 8 MAINTENANCE MODE ...
Страница 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 ...
Страница 224: ...8 17 Confidential Cover page sample End page sample Fig 8 8 ...
Страница 255: ...Confidential CHAPTER 9 ERROR INDICATION AND TROUBLESHOOTING ...
Страница 279: ...Confidential 9 23 2 Image failure 1 2 3 4 5 6 7 8 9 10 11 12 13 14 ...
Страница 280: ...Confidential 9 24 15 a 15 b 16 17 18 19 20 21 22 23 24 25 Fig 9 1 ...
Страница 325: ...App 1 5 Confidential 6 Transfer Unit X X X X X X 7 1 2 3 Location SERIAL NO YEAR MONTH DATE ...
Страница 398: ...B Power Supply PCB 100V 127V Confidential ...
Страница 399: ...B Power Supply PCB 240V Confidential ...
Страница 428: ...SM FAX045 5CS101 6 Printed in Japan ...