8-43
Confidential
[ 3 ]-3 DBV Tune Up (Code 45-3)
Function
This function is used when it is required to adjust the image density. The adjustment is
implemented by changing the developing bias voltage of each color, and it is changeable by
±7 steps from the standard value “0”.
Always implement the operation when replacing the engine control board.
Operating
Procedure
(1) Select NVM Tune UP with using the
4
or
5
key in the initial stage of the factory mode.
After selecting, press the
6
key.
The “45 NVM TUNE UP /
▲
2 3 4 5 6 7 8 9 A B C D E F G” appears on the LCD.
(2) Select “3” with using the
4
or
5
key and press the
6
key.
The “45 DBV TUNE UP /
►
Y / M / C / K” appears on the LCD.
(3) Select the color to be adjusted with using the
4
or
5
key and press the
6
key.
(4) Select the optional number with using the
4
or
5
key and press the
6
key.
The adjusted value is written into the NVRAM.
The value can be adjusted by ±7 steps.
(5) Press the
3
key so that the display is returned to the message described in Step (12).
When adjusting other colors, repeat Step (3) to (5).
(6) Press the
3
key again, and the machine returns to the initial stage of the factory mode.
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 ...