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MX-1800N  ADJUSTMENTS  6 – 29

1) Place a scale on the document table as shown in the figure

below.
Place a scale so that it is in parallel with the scanning direction
and that its lead edge is in contact with the document guide
plate.
Place white paper on the document table so that the scale lead
edge can be seen.

2)

Enter the simulation 50-1 mode.

3) Set RRCA, LEAD, and SIDE to the default values.

4) Perform the image lead edge reference position adjustment.

Touch [CLOSE] key, and shift from the simulation mode to the
copy mode and make a copy in 100% mode and in 200%
mode.
When the adjustment value of RRCA is proper, the lead edge
image from 3.0mm is not copied in either of 100% and 200%
copy scale.
If not, change and adjust the RRCA value.
(Adjust so that the lead edge image from 3.0mm is not copied
in either of different copy magnification ratios.)
Repeat the above procedures until a satisfactory result is
obtained.

5)

Image loss adjustment
When the adjustment item of the image loss below is set to the
default value, it is adjusted to the standard state.
If it is not in the above standard state, or when it is set to a
desired value, change these adjustment items.

Void area: 3.0mm, Image loss: 3.0mm

When the adjustment value is increased, the image loss is
increased. When the adjustment value is decreased, the
image loss is decreased.
When the adjustment value is changed by 1, the image loss is
changed by 0.1mm.

OK

10-key

CLOSE

A:

A㧦 xx

B㧦 xx

C㧦 xx

D㧦 xx

㧧

RRCA

㧧

RRCB-CS12

㧧

RRCB-CS34

㧧

RRCB-LCC

SIMULATION NO.50-01

LEAD EDGE ADJUSTMENT VALUE

xx

0

99

OK

TEST

CLOSE

0

A:

A㧦 xx

B㧦 xx

C㧦 xx

D㧦 xx

㧧

RRCA

㧧

RRCB-CS12

㧧

RRCB-CS34

㧧

RRCB-LCC

SIMULATION NO.50㧙01

LEAD EDGE ADJUSTMENT VALUE

xx

㨇

0 㨪 99 㨉

OK

TEST

0

A

RRCA

Image lead edge position 
adjustment value

Document lead edge reference position (OC)

0 – 99

50

B

RRCB-CS12

Resist motor ON timing 
adjustment

Standard cassette

1 – 99

50

C

RRCB-CS34

Desk 

1 – 99

50

D

RRCB-LCC

LCC

1 – 99

50

E

RRCB-MFT

Manual feed

1 – 99

50

F

RRCB-ADU

ADU

1 – 99

50

G

LEAD

Image loss adjustment

Lead edge image loss adjustment

0 – 99

30

H

SIDE

Side image loss adjustment

0 – 99

20

I

DENA

Void area amount adjustment

Lead edge void area adjustment

1 – 99

30

J

DENB

Rear edge void area adjustment

1 – 99

20

K

FRONT/REAR

FRONT/REAR void area adjustment

1 – 99

20

100%

200%

5mm 10mm

5mm

10mm

Paper lead
edge

Scale image 3.0mm position

LEAD

Image loss 
adjustment 
value

Lead edge 
image loss 
adjustment 

0 – 99

30

3.0 

± 

1.0mm

SIDE

Side image 
loss 
adjustment

0 – 99

20

2.0 

± 

1.0mm

5mm

4

3

2

1

Paper lead edge

Copy area

Maginification ratio: 400%

MX-1800N  ADJUSTMENTS  6 – 30

 

 

This adjustment is required in the following cases:
* When the resist roller section is disassembled.
* When the LSU is replaced or removed.
* When a U2 trouble occurs.
* When the PCU PWB is replaced.
* When the EEPROM on the PCU PWB is replaced.
(Caution)
This adjustment is performed by the user to increase the lead edge
void area to greater than the standard value (3mm) in the printer
mode.

1)

Enter the simulation 50-05 mode.

2) Select the set item E with the scroll key, and enter the value

corresponding to the paper feed tray with A4 (11 x 8.5) paper
in it.

3) Touch [EXECUTE] key.

The adjustment pattern is printed.

4) Measure the distance from the paper lead edge the adjustment

pattern to the image lead edge, and check to confirm that it is
in the standard adjustment value range.
Standard adjustment value: 3.0 

± 2.0mm

If the above condition is not satisfied, perform the following
procedures.

5)

Select the adjustment target of the paper feed mode adjust-
ment item DENC with the scroll key.

6)

Change the adjustment value.
Enter the adjustment value and touch [OK] or [EXECUTE] key.
When [EXECUTE] key is touched, the adjustment pattern is
printed.
When the adjustment value is increased, the distance from the
paper lead edge to the image lead edge is increased. When
the adjustment value is decreased, the distanced is
decreased.
When the set value is changed by 1, the distance is changed
by about 0.1mm.

Repeat the procedures 4) – 6) until the condition of 4) is satisfied.

 

(1) Note before execution of the copy color balance/density
adjustment
* After completion of this adjustment, the printer color balance/

density adjustment must be executed.

* Requisite conditions before execution of the copy color balance/

density adjustment

Before execution of the copy color balance/density adjustment,
check to insure that the adjustments which affect the copy color
balance/density adjustment have been completed.
The importance levels of them are shown below.

EXECUTE

EXECUTE

0

A:

A㧦xxx

B㧦xxx

㧧

DEN-C

㧧

DEN-B

SIMULATION NO.50-05

LEAD EDGE ADJUSTMENT VALUE (PRINTER)

xxx

1 99

OK

TEST

EXECUTE

CLOSE

C㧦xxx

㧧

FRONT/REAR

D㧦xxx

㧧

MULTI COUNT

0

A:

A㧦xxx

B㧦xxx

㧧

DEN-C

㧧

DEN-B

SIMULATION NO.50-05

LEAD EDGE ADJUSTMENT VALUE (PRINTER)

xxx

1 99

OK

TEST

EXECUTE

CLOSE

C㧦xxx

㧧

FRONT/REAR

D㧦xxx

㧧

MULTI COUNT

End of print

A

DEN-C

Printer print image lead edge adjustment

1 – 99

30

3.0 

± 2.0mm

D

MULTI COUNT

Print quantity

1 – 999

1

—

E

PAPER

MFT

Cassette select

Manual feed

1 – 6

1

2 (CS1)

CS1

Cassette 1

2

CS2

Cassette 2

3

CS3

Cassette 3

4

CS4

Cassette 4

5

LCC

LCC

6

F

DUPLEX

YES

Duplex print select

Select

0 – 1

0

1 (NO)

3.0±2.0mm

MX-1800N  ADJUSTMENTS  6 – 31

(The following items affect the copy color balance/density
adjustment, and must be checked and adjusted before execu-
tion of the image quality adjustments.)
1) The following adjustment items must be adjusted properly.

2) The set values of the following simulations must be set to the

default values.

3) The following items (correction functions) of SIM 44-1 must be

set to ENABLE (default).

(The following items affect the copy color balance/density
adjustment, but it is not required to adjust them frequently.
When, however, a trouble occurs, check and adjust them.)
1)

The following items must be adjusted properly.

(Relationship between the servicing job contents and the copy
color balance/density adjustment)
Note that the preliminary jobs before execution of the copy color
balance/density adjustment depend on the machine status and the
servicing conditions.
Follow the flowchart of the copy color balance/density adjustment
procedures depending on the actual conditions.
There are following four, major cases.
1)

When installing the machine.

2)

When the periodic maintenance is performed.

3)

When a repair, an inspection, or a maintenance is performed.
(When a consumable part is replaced.)

4)

When a repair, an inspection, or a maintenance is performed.
(Without replacement of a consumable part)

ADJ 
5

Image density 
sensor, image 
registration 
sensor 
adjustment

ADJ 
5A

Color image sensor calibration

44-13

ADJ 
5B

Color image density sensor, 
black image density sensor, 
image registration sensor 
adjustment

44-2

ADJ 
6

Image skew adjustment (LSU (writing) unit)

64-1/61-4

ADJ 
7

OPC drum 
phase 
adjustment

ADJ 
7A

OPC drum phase adjustment 
(Auto adjustment)

50-22

ADJ 
7B

OPC drum phase adjustment 
(Manual adjustment)

44-31

ADJ 
10

Image 
registration 
adjustment 
(Print engine 
section)

ADJ 
10A

Image registration adjustment 
(Main scanning direction, sub 
scanning direction) (Auto 
adjustment) 

50-22

ADJ 
10B

Image registration adjustment 
(Main scanning direction) 
(Manual adjustment)

50-20

ADJ 
10C

Image registration adjustment 
(Sub scanning direction) 
(Manual adjustment)

50-21

46-1

A – U

50

46-2

A – L

50

46-10

A – O

500

46-16

A – O

500

HV

Normal operation high-
density process control YES/
NO setting

Normal 
(Inhibit: 1: NO)
Highlighted 
(Allow: 0: YES)

Allow

HT

Normal operation half-tone 
process control YES/NO 
setting

Allow

TC

Transfer output correction 
YES/NO setting

Allow

MD VG

Membrane decrease grid 
voltage correction YES/NO 
setting

Allow

MD LD

Membrane decrease laser 
power voltage correction 
YES/NO setting

Inhibit

MD EV

Membrane decrease 
environment grid voltage 
correction YES/NO setting

Allow

MD DL

Membrane decrease 
discharge light quantity 
correction YES/NO setting

Allow

MD DL EV

Membrane decrease 
environment discharge light 
quantity correction YES/NO 
setting

Inhibit

TN_HUM

Toner density humidity 
correction YES/NO setting

Allow

TN_AREA

Toner density area correction 
YES/NO setting

Allow

TN_LIFE

Toner density life correction 
YES/NO setting

Normal 
(Inhibit: 1: NO)
Highlighted 
(Allow: 0: YES)

Allow

TN_COV

Toner density print rate 
correction YES/NO setting

Allow

TN_PROCON

Toner density process control 
correction YES/NO setting

Allow

TN_ENV

Toner density environment 
correction YES/NO setting

Allow

TN_DRIP

Toner density correction, 
unconditional supply YES/
NO setting

Allow

TN_SPEND

Toner compulsory 
consumption mode YES/NO 
setting

Allow

PHT

1Pixel half-tone process 
control correction YES/NO 
setting

Inhibit

AR_AUTO

Auto resist adjustment YES/
NO setting

Allow

AR_ERROR

Error check YES/NO setting 
during auto resist adjustment

Allow

DM_PHASE

Drum phase alignment YES/
NO setting

Allow

SENSITIVITY

Toner density correction 
YES/NO setting

Inhibit

PRT_HT

Half tone process control 
printer correction feedback 
Enable/Disable setting

Allow

ADJ 1

Developing doctor gap adjustment

ADJ 2

Developing roller main pole position adjustment

ADJ 4

High voltage 
adjustment

ADJ 
4A

Main charger grid voltage 
adjustment

8-2

ADJ 
4B

Developing bias voltage 
adjustment

8-1

ADJ 
4C

Transfer voltage adjustment

8-6

ADJ 12

Scan image focus adjustment (CCD unit position 
adjustment)

MX-1800N  ADJUSTMENTS  6 – 32

The necessary work items for each condition are marked with "

∗

."

START

㧝

Process correction is forcibly

performed. (SIM 44-6)

Execute the half tone image

correction. (SIM 44-26)

Check the copy color balance/density.

(Manual operation) Text/Printed photo mode

(Test chart UKOG-0162FCZZ/

UKOG-0283FCZZ is used.)

Are the copy

color balance and density

at satisfactory

levels?

No

Is the CCD replaced?

Yes

Set the ST chart

(UKOG-0280FCZZ) on

the original table.

Perform ADJ 20A

CCD gamma adjustment.

SIM 63-3 (Normal document mode)

Enter the SIM 63-03

mode and press the

EXECUTE key.

Check the copy color balance/density.

(Manual operation) Text/Printed photo mode

(Test chart UKOG-0162FCZZ/

UKOG-0283FCZZ is used.)

(to Next page)

No

Yes

(to Next page)

: Standard adjustment flow

After

replacing

OPC drum

After

replacing

developer

drum

After

replacing

transfer belt

After

replacement
of the image

density sensor

After cleaning

scanner

(reading)

section

When in

install/repair/check

(without replacing

consumable parts)

OPC drum counter clear

24-7

∗

Developer counter clear

24-5

∗

ADJ 5A

Color image density sensor
calibration

44-13

∗

ADJ 7

OPC drum phase adjustment

50-22 (44-31)

∗

ADJ 6

Image skew adjustment
(LSU (writing) unit)

64-1/61-4

ADJ 10

Image registration adjustment
(Print engine section)

50-22 (50-20/
50-21)

Simulation

Work item

JOB No

∗

∗

When in repair, check/maintenance (with replacing consumable parts)