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(3) Remove the original reference plate and the right upper side
cabinet, and remove the original table glass.
(4) Move the exposure plates a, b, c, and d in arrows directions A
and B to adjust exposure. Moving the plates in the direction of
arrow A makes the copy darker, and moving in the direction of
arrow B makes the copy lighter.
A
A
B
B
Exposure adjustment
plate b
Exposure adjustment
Exposure adjustment
plate a
plate c
(Example) If the half tone copy is as shown below, move the
exposure adjustment plate a in the direction of
arrow B to balance exposure.
Paper
discharge
direction
Half-tone copy
(5) After adjustment, set the original table glass. Make a copy to
check uniformity of copy density. If the copy exposure is not
uniform, repeat procedures (1) – (5).
K. Copy lead edge adjustment
a. This adjustment is performed to provide the maximum effective
copy size, proper void area, improve separation in the photocon-
ductor section, fusing section, and reducing dirt in the fusing
section pawls.
b. This adjustment must be performed in the following cases.
•
When the mirror home position sensor (MHPS) is replaced or
its installing position is changed.
•
When the mirror base is replaced.
•
When the resist roller and the resist roller clutch are replaced.
•
When the main control PWB is replaced.
•
When the ADF is installed or disassembled.
•
When the original guides L and R are removed and the glass
is removed.
<Adjustment procedure>
* The copy lead edge adjustment is performed with simulation 50-
01 and 50-02.
When the copy lead edge adjustment is made with simulation 50-
01:
In this simulation, the following keys and the display section have
special functions.
Reduction key: Makes the magnification ratio 50%.
Enlargement key: Makes the magnification ratio 200%.
•
% key:
Pressing the % key changes A → b → c → d → A → sequen-
tially, and the set value corresponding to the display is dis-
played on the copy quantity display.
A: RRC-A set value
b: RRC-B set value
C: Lead edge void amount set value
d: Rear edge void amount set value
A
B
Exposure adjustment
plate d
Exposure
insufficient
7 – 13
(The value displayed before pressing the % key is stored in the
memory by pressing the zoom up key.)
Display section:
During execution of the simulation, the RRC-A value is displayed
on the copy quantity display.
Top digit:
Displays A, b, C, d.
Lower two digits: Displays RRC-A value, RRC-B value, or void
area value.
<Adjustment procedure>
(1) Put a scale on the original table.
Scale
(2) Press keys as follows:
C → ë → 0/◊ → ë → 5 →
0/◊ → PSW → 1 → PSW
Simulation 50-01 is executed and the ready lamp lights up.
The previously set value (1 – 99) is displayed. (RRC-A content)
(3) Set values A and B to zero, and make copies at 100% and
200%.
0/◊ → 0/◊ → % key →
•
0/◊ → 0/◊ → PSW (A copy at 100% is made.)
Enlargement key → (Lens shift, ready) → PSW (A copy at
•
200% is made.)
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