Sharp MX 3501N - Color Laser - Copier, Service Manual

Page: 66 / 448

MX3500N ADJUSTMENTS 6 – 21
4) Check the rough adjustment and the fine adjustment print pat-
tern positions of each color.
The visually highest color density section is regarded as the
center, and used as the measurement value.
(If the fine adjustment print pattern is positioned in the range of
0
±
1 for the fine adjustment reference pattern scale, the
adjustment is not required.)
If the above condition is not satisfied, select the color mode
adjustment item A – C to be adjusted with the scroll key, and
change the adjustment value to adjust.
Repeat procedures 3) – 4) until a satisfactory result is
obtained.
For measurement of the shift amount and calculation of the
adjustment value, refer to the table below.
(Measurement of the shift amount and calculation of the
adjustment value)
a) Measurement of the shift amount
* Measurement of the fine adjustment pattern
The visually highest color density section is regarded as
the center, and used as the measurement value of the
shift amount.
(Example)
The measurement value of the figure is "7."
* Measurement of the rough adjustment pattern
Check that the color line is positioned in the plus direc-
tion or in the minus direction and judge the polarity from
that.
The center black line mark is scaled as 0, the first line
mark as 20, the second line mark as 40, the third line
mark as 60. The interval between the rough adjustment
marks corresponds to 20.
(Example)
In the case of the figure, it is between 20 – 40 of the
plus polarity, and the measurement is "20."
A: Rough adjustment pattern
B: Fine adjustment pattern
C: Adjustment range
The shift amount is calculated from the adjustment ref-
erence position for each of the three adjustment items A
– C.
Measurement value: –27 (= –20 – 7)
Measurement value: 27 (= 20 + 7)
Rough adjustment
print pattern check: Check that the rough adjustment print pattern is at
the center for the rough adjustment reference
pattern.
Fine adjustment
print pattern check: Check that the fine adjustment print pattern is at the
center for the fine adjustment reference pattern.
Display/Item Content
Adjustment
value range Default
value
A CYAN Image registration adjustment
value (Sub scanning
direction) (Cyan) 1 – 199 100
B MAGENTA Image registration adjustment
value (Sub scanning
direction) (Magenta) 1 – 199 100
C YELLOW Image registration adjustment
value (Sub scanning
direction) (Yellow) 1 – 199 100
-20
C
A
B
20
C
A
B