Sharp SF-1120 - Manual (Page 79)

(3) Check to confirm the lens value specified on the lens value
label.
(4) Insert a screwdriver into hole (P) in the right rear side (paper
feed side) of the optical base plate, and adjust the adjustment
screw. The scale on the zoom base at section Q in the figure
below determines the position of the No. 4/5 mirror cor-
responding to the lens value.
<Example> When the lens value is +1.2, loosen the adjustment
screw and adjust so that the arrow section of the No.
4/5 mirror drive holder points to the zoom base scale at
+1.2.
Turning the adjustment screw clockwise moves the No.
4/5 mirror drive holer arrow section in the (–) direction,
and turning it counterclockwise moves the arrow sec-
tion in the (+) direction.
C. Vertical copy magnification ratio adjustment
Be sure to check that mirror bases A, B and C are in parallel and
that the focus is proper before executing this adjustment.
This adjustment must be performed in the following cases.
• When the lens home position sensor (LHPS) is replaced or its
installation position is changed.
• When the lens is replaced.
• When the mirror base is replaced or its installing position is
changed.
• When the main PWB is replaced.
• When the EEPROM inside the main PWB is replaced.
<Procedure>
(1)
Put a scale on the original table as shown in the figure below.
(2) Make a normal copy (100%) on an A4 (11" × 8 1 ⁄
2 ") paper.
(3) Compare the scale image length and the scale length.
Q
P
No. 4/5 mirror drive
holder arrow section
Zoom
base
(-) direction (+) direction
One scale = 1mm
No.4/5 sdjustment
screw
(shaded portion)
Scale
A4 (11" x 8½")
paper
100 110 120 130 150 140
mm
1/2mm
JAPAN
HARDDENCD
STAINLESS
Shizuoka
100 110 120 130 150 140
mm
1/2mm
JAPAN
HARDDENCD
STAINLESS
Shizuoka
110
10 20
10 20
(When a 100mm scale is used as the original.)
Paper feed direction
Reference Comparison point
Original scale
Copy
7 – 5