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MX-1800N  SELF DIAG AND TROUBLE CODE  8 – 1

MX-1800N

Service Manual

 

When an error occurs in the machine or when the life of a consum-
able is nearly expired or expired, the machine detects and displays
the particular issue on the operation panel. This allows the service
person to take suitable action to resolve the issue. In case of a trou-
ble code, the machine logs the error and stops the machine to min-
imize damage.

1) Securing machine safety. (The machine is stopped on detec-

tion of a problem)

2) The damage to the machine is minimized. (The machine is

stopped on detection of a problem.)

3) By displaying the area of trouble, the trouble position can be

quickly identified. (This allows service person to perform an
accurate repair, improving the repair efficiency)

4) Advance warning of consumable end of part of life avoids stop-

ping of the machine due to consumable life end and allows for
ordering the proper parts for installation.

The self diag messages are classified as shown in the table below.

The machine always monitors its state of operation.
When the machine recognizes a problem, it stops the operation
and displays the trouble message.
A warning message is displayed when a consumable part life is
nearly expired or is expired.
When a warning message is displayed, the machine may or may
not stop depending upon the situation.
The trouble messages and the warning messages are displayed by
the LCD.
Some trouble messages are automatically cleared when the trou-
ble is repaired. Some other trouble message must be cleared by a
simulation.
Some warning messages of consumable parts are automatically
cleared when the consumable is replaced. Some other warning
message must be cleared by a simulation.

Class 1

User

Warning of troubles which can be recovered by 
the user. (Paper jam, consumable part life 
expiration, etc.)

Serviceman

Warning of troubles which can be recovered only 
by a serviceman. (Motor trouble, maintenance, 
etc.)

Other

—

Class 2

Warning

Warning to the user, not a machine trouble 
(Preliminary warning of life expiration of a 
consumable part, etc.)

Trouble

Warning of a machine trouble. The machine is 
stopped.

Other

—

Troubleshoot the cause.

YES

NO

Detects/analyzes

the content.

Trouble/Warning

Warning

Trouble

The machine is stopped.

The content is displayed.

Trouble/Warning

Warning

A consumable

part has reached

its lifetime.

Trouble

Replace or supply

the consumable part.

Cancel the self-

diagnostic message with

the diagnostics

(test commands).

Reset

Standby state

Monitors the machine

conditions.

Repair

MX-1800N  SELF DIAG AND TROUBLE CODE  8 – 2

There are following cases of the breakdown mode.

FAX board trouble (1 line)

ICU

F6

{

{

{

{

 

1

 

1

{

{

 1

HDD trouble

E7 (03)

{

SCU communication 
trouble

E7 (80), A0-02

{

{

{

{

PCU communication 
trouble

E7 (90), A0-01
L8-20

{

Backup battery voltage fall

U1 (01)

{

Controller fan motor 
trouble

L4-30

Connection trouble (ICU 
detection)

E7 (60 – 65), 
A0 (10 – 12, 20)

Serial number 
discrepancy

U2 (30)

Memory error (included 
not installed the expansion 
RAM)

U2 (00, 05, 10, 
11, 22, 23, 24, 
25)

{

HDD registration data sum 
error

U2 (50)

{

Image memory trouble, 
decode error

E7 (00, 01, 05, 
06, 08, 09)

{

Network error

CE

{

{

Operatable 

but send 

NG

{

Operatable 

but send 

NG

{

{

{

{

{

Process control trouble 
(Only history is left.) (ICU 
detection)

F2 (80 – 87)

{

{

{

{

{

{

{

{

{

Laser trouble

PCU

E7 (20, 28, 29), 
L6 (10)

* 7

{

Connection trouble (PCU 
detection)

E7 (50, 55), 
A0 (21)

PCU section troubles 
(motor, fusing, etc.)

H2, H3, H4, H5, 
L4 (excluding L4-
30), U2 (90, 91), 
F2 (40, 64, 70, 
74), L8 (01, 02)

* 7

{

PCU color system 
troubles

E7 (21), F2 (41 – 
43, 65 – 67, 71 – 
73, 75 – 77)

*  6

*  6

*  6

*  6

*  6

*  6

*  6

*  6
* 7

{

Paper feed tray 1 trouble

F3-12

 2

{

{

{

{

 

2

 

2

 

2

* 7

{

Paper feed tray 2 trouble

F3-22

 2

{

{

{

{

 

2

 

2

 

2

* 7

{

Paper feed tray 3 trouble

U6-01

 2

{

{

{

{

 

2

 

2

 

2

* 7

{

Paper feed tray 4 trouble

U6-02

 2

{

{

{

{

 

2

 

2

 

2

* 7

{

Paper feed tray other 
troubles

U6 (00, 10, 50)

 8

{

{

{

{

 

8

 

8

 

8

* 7

{

Staple trouble

F1 (10)

 3

 3

 3

 3

 3

 3

 3

 3

* 7

{

After-process trouble

F1 (excluding 10)

 3

 3

 3

 3

 3

 3

 3

 3

* 7

{

Other troubles

EE (EL, EU, EC)

{

{

{

{

{

{

{

{

{

Process control trouble 
(PCU detection)

F2 (39, 44, 45, 
49, 51, 58, 78)

{

* 9

{

{

{

{

{

{

{

{

Connection trouble (SCU 
detection)

SCU

E7 (70, 75), 
A0 (22)

SCU color system 
troubles

UC (02)

{

{

{

{

Document control trouble

UC (20)

{

{

{

{

EEPROM system

U2 (80, 81)

{

{

{

{

Scanner section troubles 
(mirror motor, lens, copy 
lamp)

L1, L3

{

{

{

{

CCD troubles (shading, 
etc.)

E7 (10, 11, 14)

{

{

{

{

MX-1800N  SELF DIAG AND TROUBLE CODE  8 – 3

{

: Operation enabled,

: Operation disabled

 1: The operation is enabled in a line other than the trouble line.
 2: When detected during other than a job, the operation is enabled with a tray other than the trouble tray.
 3: When detected during other than a job, the operation is enabled in a section other than the trouble paper exit section. * When, however,

the right tray is set.

 4: When detected during other than a job, the operation is enabled in the OC mode.

* 5: Cannot be shifted to the nighttime mode/power saving function. The power cannot be turned OFF with the power SW on the operation
panel.
* 6: When the color mode is set to Disable in the "Color mode disable setting" of the system setting, the operation is enabled in the Black
mode. 
* 7: Since communication is enabled, reception can be transferred.

 8: When detected during other than a job, the operation is enabled in other than the DESK.

* 9: Trouble display message is displayed in 2 lines. (Example: Ready to copy. F2 trouble)
* Trouble mode process
• Machine operation enabled under some conditions.

The operations excluding the trouble mode are enabled (READY). For the mode where operations are disabled, only setting is enabled and
the operation disable message is made.
(NOT READY)
(Display) A dialog is displayed when a trouble occurs. For the mode where operations are enabled, [OK] button is added to the message.
When operations are disabled, [OK] button is not displayed, and the message is displayed until the trouble is cancelled.
* For 

 2, 3, 4, 8, perform the following procedures. (In order to avoid patent interference.)

• When a trouble is detected during a job, the machine operation is terminated. (Trouble display/without [OK] key)
• When a trouble is detected during other than a JOB, the trouble display is not made and the trouble position cannot be selected. (The dis-

play is not turned off. Machine/Button)

• Troubles which disable the machine operations

The trouble display is always made, and all the modes cannot be set.

• Writing to the trouble memory

Writing of a same trouble to the trouble memory can be selected with SIM 26-35. When this simulation is set, any trouble is written to the
trouble memory unconditionally.
(Sim.26-35)
0: Only once. If same as the previous one, it is not saved. (Default)
1: Any time. Though same as the previous one, it is saved.

Process control trouble 
(Only history is left.) (ICU 
detection)

MFP

F2 (80 – 87, 90)

{

{

{

{

{

{

{

{

{

Process control trouble 
(Only history is left.) (PCU 
detection)

PCU

F2 (91 – 94)

{

{

{

{

{

{

{

{

{

MX-1800N  SELF DIAG AND TROUBLE CODE  8 – 4

• When the power is turned ON and each trouble of H3, H4, H5, U1, U2, PF, U6 (09) is stored, it is judged as a trouble immediately.

(To the corresponding
block)

MFP event

manager

Communication of trouble status
[Trouble code] [Trouble status]

sim task

Trouble cancel command

Trouble cancel status is communicated.

Each block

When the power is turned on,
check is made in each block.

Trouble cancel
(The trouble memory is
initialized.)

·

H3, H4, U1, U2, PF, U6 trouble check

·

When executing SIM 13, 14, 15, 16, 17

Trouble check is made in each block when initializing
and data are sent to the MFPcnt.

H3, H4, H5: Saved in the MFPcnt.
U1: Saved in the MFPcnt.
U2: Saved in each block.
PF: Saved in the MFPcnt.
U6-09: Saved in the PCU.

SIM 13: U1 trouble cancel
SIM 14: H3, H4, H5 (Color mode

cancel)

SIM 15: LCC (U6) trouble cancel
SIM 16: U2 trouble cancel
SIM 17: PF trouble cancel

A0

01

PCU ROM abnormality

PCU

02

SCU ROM abnormality

Scanner

10

Controller ROM error

MFP

11

IF version discrepancy (CTL-PCU)

MFP

12

IF version discrepancy (CTL-SCU)

MFP

20

Machine level error (CTL detection)

MFP

21

Machine level error (PCU detection)

PCU

22

Machine level error (SCU detection)

Scanner

CE

00

Communication error other than CE-01 – 08

MFP

01

Network controller trouble

MFP

02

Not-specified mail/FTP server error

MFP

03

Communication error in image send 

MFP

04

FTP server account name or authentication password 
input error

MFP

05

FTP server directory input error

MFP

06

POP3 server access error

MFP

07

POP3 server authentication check error 

MFP

08

POP3 server timeout error 

MFP

E7

00

System memory access error

MFP

01

System data trouble

MFP

03

HDD trouble

MFP

05

Local memory access error

MFP

06

Decode error trouble: Compression decode error (A 
compression file cannot decompressed.)

MFP

08

Local memory specifications error

MFP

09

Local memory combination error

MFP

10

Shading trouble (Black correction)

Scanner

11

Shading trouble (White correction)

Scanner

14

SCAN-ASIC trouble

Scanner

20

LSU BD detection trouble

PCU

21

LSU LD deterioration trouble

PCU