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MX-M1204  MX-M904/M1054/M1204 (MAIN UNIT)  2 – 17

7)

Select [FACTORY] target, and press [EXECUTE] key. 

When the gray balance is customized with the manual gray
balance adjustment (SIM 67-25) according to the user's
request and the gray balance is registered as the service tar-
get with SIM 67-27, if the gray balance is adjusted to that gray
balance, select the [SERVICE] target. 

The printer gray balance adjustment (step 1) is automatically
performed and the gray balance check patch image is printed
out. 

If there is any streak or unclear print on the printed check pat-
tern, check the print engine for any problems.

8)

The initial setting menu of the halftone image correction is dis-
played. 

Press [OK] key. 

The initial setting of the halftone image correction is per-
formed.

9)

Wait until [EXECUTE] key is displayed. 

When it is displayed, press it. 

The halftone image correction is performed.

10) When "COMPLETED THIS PROCEDURE" is displayed, the

adjustment operation is completed. 

Cancel SIM46-74.

NOTE: The adjustment result becomes valid only when the

both adjustments in the copy mode and in the printer
mode are completed. 
For example, if the copy gray balance adjustment
(automatic adjustment) is performed and the simula-
tion is canceled, the adjustment result is invalid.

11) Check the copy gray balance and density. 

(Refer to the item of the copy gray balance and density check.) 

When the gray balance and the density are unsatisfactory after
the automatic adjustment by selecting the factory target in pro-
cedure 4), execute the manual gray balance adjustment
(ADJ11C (2)). 

Also when the service target is selected in procedure 4) to exe-
cute the automatic adjustment and a satisfactory result is not
obtained, perform the manual gray balance adjustment (ADJ
11C (2)).

12) Check the printer gray balance and density. 

(Refer to the item of the printer gray balance and density
check.) 

If a satisfactory result on the gray balance and the density is
not obtained with the automatic adjustment, execute the man-
ual adjustment (SIM 67-25) (ADJ 11E (2)). 

Also when the service target is selected in procedure 7) to exe-
cute the automatic adjustment and a satisfactory result is not
obtained, perform the manual gray balance adjustment (ADJ
11E (2)). 

If the gray balance or density is not in the satisfactory level
even after execution of the automatic and manual adjustments,
there may be another cause. 

Troubleshoot the cause, repair or perform necessary works,
and repeat the adjustment from the beginning.

Check that the following operations are normal.

Print the various setup data and the adjustment data (list) with
SIM22-6 and keep the data.

• In case of a memory problems, if the data is not kept, all the

adjustments must be made again.

• If the data is kept, the setup values and the adjustment values

can be entered without adjustments, shortening the servicing
time.

Q

O P

N

M

L

K

J

I

H

G

F

E

D

C

B

A

Bk

1) The max. density section is not blurred.

2) Patch C or D is very slightly copied.

3)

The patch density is identical between patches or not reversed.
The patch density is changed gradually.

High density

Low density

Key-in (operation panel)

Display (operation panel)

Paper feed 
operation

Hand feed

Paper tray

Paper size detection

Originals size 
detection

Original table 
mode

DSPF mode

DSPF 
operation/
duplex 
operation

S-S mode

D-S mode

S-D mode

D-D mode

Bookbinding operation

When the finisher is installed

Stapling operation

When the finisher is installed

Grouping operation

When the finisher is installed

Sorting operation

When the finisher is installed

MX-M1204  MX-M904/M1054/M1204 (MAIN UNIT)  2 – 18

1)

If the following options are installed, remove all of them from
the machine.

• Large capacity tray

• Inserter

• Finisher

• High capacity stacker

• Curl correction unit

• Relay unit

• Paper feed system option

2)

Remove the following consumable parts from the machine.

• Paper

• Toner cartridge

• Development cartridge

3)

Lock the following sections.

• Scanner (Optical section)

• Paper cassette lift plate

4)

Attach the protection material to the position shown below. 

• Use the "packing material for fixing the separation pawls"

which was removed when unpacking.

NOTE: Since the hard disk drive is built in the machine, refrain

from vibrations or shocks to the machine when in transit.

MX-M1204  Dehumidifying heater kit  3 – 1

MX-M1204

Service Manual

 

Heater kit HER200

DKIT-0406FCZZ

WH PWB

CPWBF1569FCE2

1

Supporter SPLSN-6

LSUPP0118FCPZ

5

WH harness

DHAI-4075HCPZ

1

Heater SW

QSW-C9294QCZZ

1

Heater SW label Pa EX

TLABZ5256FCZZ

1

SCN dehumidifier heater 230V

RHETP0148FCPZ

1

For SCN heater mounting

Snap band

LBNDJ0071FCZZ

2

For SCN heater mounting

Screw (M3 x 4cap, black)

LX-BZ0324FCPZ

2

For SCN heater mounting

Edge saddle, black

LBSHC0161FCZZ

1

For SCN heater mounting

Main unit cassette heater (240)V

RHETP0150FCPZ

2

For main unit heater mounting

Heater mounting plate

LPLTM6089FCZZ

2

For main unit heater mounting

T heater cover

PCOVP1654FCZ2

2

For main unit heater mounting

Heater cover sheet

PSHEZ5012FCZZ

2

For main unit heater mounting

Heater harness sheet

PSHEZ5135FCZZ

2

For main unit heater mounting

Screw (M3 x 6S)

XHBS730P06000

7

For main unit heater mounting
(For dehumidifier heater unit: x6, For 
cassette 4 heater: x1)

High temperature caution label

TLABZ5217FCZZ

1

For main unit heater mounting

High temperature caution mark label

TLABZ4900FCZZ

1

For main unit heater mounting

Screw (M4 x 8S)

XHBS740P08000

1

For cassette 3 heater mounting

LCC (A4) heater kit

DKIT-0437FC11 (200V series)
DKIT-0437FC12 (200V series)

Heater harness (Ex200V North America)

DHAI-5199FCPZ

1

Heater harness (Ex200V Europe)

DHAI-5200FCPZ

Snap band

LBNDJ0043FCP1

1

AC cord fixer

LFIX-0016FCZZ

1

Connector cover A

PCOVP2149FCZZ

1

Connector cover B

PCOVP2150FCZZ

1

Heater (200V series)

RHETP0121FCZZ

1

Screw (M4 x 8K)

XBPS740P08K00

1

Screw (M3 x 4)

XHBS730P04000

1

Screw for EL connector

LX-BZ1119FCZZ

1

Screw (M4 x 28K)

XBPS740P28KS0

2

Screw (M3 x 20)

XBBS730P20000

3

Screw (M4 x 8)

XHBS740P08000

1

Nut (M3 = 2.4)

XNES730-24000

3

LCC (A3) heater kit

DKIT-0439FCZZ (200V series)
DKIT-0440FCZZ (200V series)

Heater harness A3 (Ex200V North America)

DHAI-5203FCPZ

1

Heater harness A3 (Ex200V Europe)

DHAI-5204FCPZ

Snap band

LBNDJ0043FCP1

1

AC cord fixer

LFIX-0016FCZZ

1

Connector cover A

PCOVP2149FCZZ

1

Connector cover B

PCOVP2150FCZZ

1

Heater (200V series)

RHETP0121FCZZ

1

Screw (M4 x 8K)

XBPS740P08K00

1

Screw (M3 x 4)

XHBS730P04000

1

Screw for EL connector

LX-BZ1119FCZZ

1

Screw (M4 x 28K)

XBPS740P28KS0

2

Screw (M3 x 20)

XBBS730P20000

3

Screw (M4 x 8)

XHBS740P08000

1

Nut (M3 = 2.4)

XNES730-24000

3

Heater cover

PCOVP1942FCZZ

1

Heater sheet

PSHEZ5482FCZZ

1

Screw (M4 x 8 Round-tipped S-tight)

LX-BZ0941FCPZ

2

: ‘16/Sept.

MX-M1204  Dehumidifying heater kit  3 – 2

LCT heater kit

DKIT-0442FCZZ (120V series)
DKIT-0442FC11 (200V series)

LCT heater (120V series)

RHETP0145FCZZ

2

LCT heater (200V series)

RHETP0121FCZZ

LCT heater mount plate

LPLTM8436FCZZ

2

Mini clamp

LHLDW1009ACZZ

4

Edge wire saddle

LHLDW1503FCZZ

6

Screw (M3x4 S-tight)

XHBS730P04000

16

Desk heater (120V series)

RHETP0144FCZZ

3

Desk heater (200V series)

RHETP0139FCZZ

Desk heater mount plate

LPLTM6021FCZZ

3

Heater heat sink

PRDAR0087FCZZ

3

Mini clamp

0EUHLD0214C//

9

Screw (M3x6 S-tight)

XHBS730P06000

6

Screw (M4x8 S-tight)

XHBS740P08000

2

Step screw

LX-BZ0714FCPZ

2

High temperature warning label

TLABZ4900FCZZ

2

Dehumidifier heater switch

QSW-C9294QCZZ

1

LCT WH SW harness

DHAI-5131FCPZ

1

LCT heater harness 1 (120V series)

DHAI-5143FCPZ 

1

LCT heater harness 1 (200V series)

DHAI-5251FCPZ 

LCT heater harness 2 (120V series)

DHAI-5144FCPZ 

1

LCT heater harness 2 (200V series)

DHAI-5252FCPZ 

Heater SW label Pa EX

TLABZ5256FCZZ

1