Brother MFC-760, Service Manual

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3.2 Printout of Scanning Compensation Data
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Function
The equipment prints out the white and black level data for scanning compensation.
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Operating Procedure
Do not start this function merely after powering on the equipment but start it after carrying out a
sequence of scanning operation. Unless the equipment has carried out any scanning operation,
this function cannot print out correct scanning compensation data. This is because at the start of
scanning operation, the equipment initializes white and black level data and takes in the scanning
compensation reference data.
(1) Press the 0 and 5 keys in this order in the initial stage of the maintenance mode.
The "WHITE LEVEL 1" will appear on the LCD.
(2) The equipment prints out the scanning compensation data list containing the following:
a) White level data for red image (310 bytes)
b) White level data for green image (310 bytes)
c) White level data for blue image (310 bytes)
d) Black level data (4 bytes for red, green, blue, and monochrome images, one byte/color)
e) Dark level offset data (4 bytes for red, green, blue, and monochrome images, one
byte/color)
f) Gain control data (8 bytes for red, green, blue, and monochrome images, two
bytes/color)
g) A/D converter reference level for center value (2 bytes for color and monochrome
images, one byte/color)
h) A/D converter reference level for full range (2 bytes for color and monochrome images,
one byte/color)
(3) Upon completion of recording of the compensation data list, the equipment returns to the
initial stage of the maintenance mode.
NOTE: When the equipment prints monochrome images after monochrome scanning, only the
green data is valid.
NOTE: If any data is abnormal, its code will be printed in inline style, as shown on the next page.
NOTE: Out of eight picture elements of white level data, one byte of the minimum value will be
outputted.