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

Page: 60 / 448

MX3500N ADJUSTMENTS 6 – 15
3) Set A4 (11 x 8.5) paper in the paper feed tray selected in pro-
cedure 2).
4) Press [EXECUTE] key.
The adjustment pattern is printed.
5) Check the adjustment pattern image position.
Measure the dimension of the void area in the front and the
rear frame direction of the adjustment pattern, and check that
all the following conditions are satisfied.
RV: REAR VOID AREA
FV: FRONT VOID AREA
RV + FV
≤
4.0mm
RV = 2.0
±
2.0mm
FV = 2.0
±
2.0mm
If the above conditions are not satisfied, execute the proce-
dures below.
6) Select the paper feed mode adjustment item (B – H) to be
adjusted with the scroll key.
7) Change the adjustment value.
Enter the adjustment value and press [OK] or [EXECUTE] key.
When [EXECUTE] key is pressed, the adjustment pattern is
printed.
When the adjustment value is increased, the adjustment pat-
tern is shifted to the front frame side. When it is decreased, the
adjustment pattern is shifted to the rear frame side.
When the set value is changed by 1, the shift distance is
changed by about 0.1mm.
Repeat procedures 3) – 7) until the conditions of procedure 5)
are satisfied.
In case a satisfactory result cannot be obtained by repeating
the above procedures, perform the following procedure.
8) Loosen the paper feed tray off-center adjustment screws (2
pcs.) at the center section of the lift plate of the paper feed tray,
and change the gear unit position in the front/back frame direc-
tion. Repeat the adjustment procedures from 4).
ADJ 10
Image registration adjustment
(Print engine section)
This adjustment must be executed in the following cases:
* When the LSU (writing) unit is replaced.
* When the LSU (writing) unit is removed from the main unit.
* When the color image registration mistake in the main scanning
direction occurs.
* When the color image registration mistake in the sub scanning
direction occurs.
* When the unit is installed or when the installing place is changed.
* When maintenance is executed. (Replacement of the OPC drum,
the OPC cartridge, the transfer unit, the transfer belt, etc.)
* When [ADJ8] print engine image magnification ratio (BK) (main
scanning direction) is performed.
* When U2 trouble occurs.
* When the PCU PWB is replaced.
* When EEPROM on the PCU PWB is replaced.
Note before adjustment
(Before execution of this adjustment, all the following adjustments
must have been completed.)
* Image skew adjustment (LSU (writing) unit)
* Print engine image magnification ratio adjustment (BK) (Main
scanning direction) (Print engine section)
H ADU Print off-center adjustment
value (ADU)
Note: Before execution of
this adjustment, check to
insure that the adjustment
items A – G have been
properly adjusted. If not,
this adjustment cannot be
made properly. 1 – 99 50
I MULTI COUNT Print quantity 1 – 999 1
J PAPER MFT Paper feed
tray select Manual paper
feed tray 1 – 6 1 2 (CS 1)
CS 1 Paper feed
tray 1 2
CS 2 Paper feed
tray 2 3
CS 3 Paper feed
tray 3 4
CS 4 Paper feed
tray 4 5
LCC LCC 6
K DUPLEX YES Duplex
print select Selected 0 – 1 0 1 (NO)
Display/Item Content
Set
range
Default
value