Alignment Of Vertical Print Lines In Monochrome And In Two Colors And Adjustment Of Head Skew (Function Code 65); Alignment Of Vertical Print Lines In Monochrome And In Two - Brother MFC4820C Service Manual

7.5.13 Alignment of Vertical Print Lines in Monochrome and in Two Colors and Adjustment of Head
Skew (Function code 65)
Function
This function allows you to align vertical lines printed in the forward and backward direction of
the carriage and adjust the head skew.
If the print head unit or driver PCB is replaced with a new one, you need to make the adjustment
given in this section.
NOTE: If the print head unit is replaced with a new one, you need to make other adjustments in
addition. Refer to Chapter 6, Section 6.1.2, "Adjusting the print head unit" flowchart.
Operating Procedure
(1) Press the 6 and 5 keys in this order in the initial stage of the maintenance mode.
The equipment displays the "MAINTENANCE 65" on the LCD and prints two sheets of
check patterns as shown on the next page.
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On the 1st sheet, two sets of vertical alignment check patterns in monochrome are printed for
500 dpi and 1200 dpi, each of which consists of #1 through #9 blocks. If the vertical
alignment is ON, #5 block (each in the 600 dpi and 1200 dpi printouts) shows vertically
aligned lines.
On the 2nd sheet, a set of vertical alignment check patterns in two colors is printed, which
consists of #1 through #3 blocks. Also a set of head skew check patterns (-2/1200 through
2/1200) is printed.
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The "600DPI NO. (1-9)" appears on the LCD.
(2) On the 1st sheet, check the printed vertical alignment check patterns for 600 dpi in
monochrome and find which number block shows full alignment. If the block is other than #5,
enter that block number by using the numerical keys.
The "1200DPI NO.(1-9)" appears on the LCD.
(3) For 1200 dpi, perform the same operation as in step (2).
The "KC-YM ADJ[1-3]" appears on the LCD.
(4) On the 2nd sheet, check a set of printed vertical alignment check patterns (#1 through #3) in
two colors and find which number block shows full alignment. Enter that block number by
using the numerical keys.
(5) Check a set of head skew check patterns (-2/1200 through 2/1200) and find which number
block shows full alignment. According to the block number, adjust the eccentric bushing
(white part which supports the print head unit on the carriage rail) as follows:
If the most aligned print is:
-2/1200
-1/1200
0/1200
1/1200
2/1200
The equipment automatically returns to the initial stage of the maintenance mode.
NOTE: If #1 or #9 block is fully aligned so that you press the 1 or 9 key in the above procedure,
then go back to step (1) to confirm that #5 block becomes aligned.
Rotate the eccentric bushing:
to the rear by 2 position markers
(No change)
(No change)
(No change)
to the front by 2 position markers
7 -2 2