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MX-DEX1/DEX2  SELF-DIAGNOSIS AND TROUBLE CODES  9 – 2

<Button Description>

When a trouble condition occurs in the machine or when there is a
consumable part whose life is nearly or already expired, the
machine's self-diagnosis program detects and analyzes the condi-
tion and issues the appropriate notification on the display panel so
that the user and the serviceperson can take the suitable action.  In
the case of a trouble condition (rather than the expiration of a part's
life), the self-diagnosis program not only issues the appropriate
notification but also stops the machine to minimize damage. 

1)

Ensures safety by stopping the machine as soon as a trouble
condition is detected.  

2)

Minimizes damage to the machine by stopping the machine as
soon as a trouble condition is detected.  

3)

Displays the description of the trouble condition so that the
user or serviceperson can quickly and accurately identify the
source of the trouble.  This helps the serviceperson to perform
repair work most effectively and efficiently. 

4)

Issues an alarm when there is a consumable part whose life is
nearly expired so that the user can order the consumable part
before its life is actually expired.  This helps prevent machine
outage due to the absence of a consumable part. 

Self-diagnosis messages can be classified into the following types: 

The self-diagnosis program built in the machine is always the mon-
itoring machine function. 
When the self-diagnosis program detects a trouble condition, it
stops the machine and displays the appropriate trouble message. 
Typically, warning messages are displayed when there is a con-
sumable part whose life is nearly or already expired.
Some warning messages are displayed without machine stoppage,
while other warning messages are displayed at the same time as
machine stoppage. 
Trouble and warning messages are displayed on the LCD with one
or more specific indicator lamps lit or flashing. 
Some trouble messages are automatically cleared upon recovery
from the trouble, while other trouble messages must be cleared
using the corresponding SIM. 
Also, some of warning messages associated with consumable
parts are automatically cleared upon replacement or refill of the
consumable part, while other messages must be cleared using the
corresponding SIM.   

 DTRC

 Desk transport clutch

Classification 
1

User

This type includes user-recoverable 
trouble or warning conditions (such as 
paper jam or consumable part life 
expiration). 

Service

This type includes serviceperson-
recoverable trouble or warning 
conditions (such as motor trouble or 
maintenance).

Miscellaneous

—

Classification 
2

Warning

This type includes those messages that 
are primarily intended to warn the user 
and not directly related with machine 
trouble (such as a warning message 
issued when there is a consumable part 
whose life is nearly expired). 

Trouble

This type includes those messages that 
are directly related with machine trouble 
and issued at the same time as machine 
stoppage. 

Miscellaneous

—

Repair

Monitor machine function

Detect and analyze trouble

Trouble/warning

Trouble/warning

Stop the machine

Identify the cause

Cancel self-diagnosis

message using "diag"

(test command), etc.

Standby

Consumable part

life expired?

Replace or refill the

consumable part

Recovery

Display the trouble

description

Trouble

Trouble

Warning

Warning

YES

NO

MX-DEX1/DEX2  SELF-DIAGNOSIS AND TROUBLE CODES  9 – 3

 

 

 

 

 

U6

00

Desk communication trouble

Desk

Desk communication is made.

Turn OFF and back ON the power.

01

Desk tray 1 lift-up motor trouble

Desk

Tray is being lifted.

Check connections, etc.

02

Desk tray 2 lift-up motor trouble

Desk

Tray is being lifted.

Check connections, etc.

10

Desk transport motor trouble

Desk

Paper is fed.

Check connections, etc.

50

Desk incompatibility trouble

Desk

The power is turned ON.

Check connections, etc.

Content

Desk communication trouble

Description

Communication error with the desk;  communication line test 
error after turning on the power or canceling an exclusive 
SIM.

Case 1

Cause

Defective connection or disconnection of 
connector and harness

Check and 
Remedy

Check the connector and the harness in the 
communication line.  Connect the connector 
properly. 
Replace the harness.

Case 2

Cause

Desk control PWB failure
Control PWB (PCU) failure

Check and 
Remedy

Replace the desk control PWB.  Replace the 
control PWB (PCU).

Case 3

Cause

Malfunction caused by electrical noise

Check and 
Remedy

Cancel by turning OFF/ON the power.

Content

Desk tray 1 lift-up motor trouble

Description

Desk tray 1 lift-up operation failure

Case 1

Cause

Defective connection or disconnection of 
connector and harness

Check and 
Remedy

Check the connectors and the harnesses of 
the desk control PWB, lift motor line, and paper 
feed unit line. 
Connect the connector properly.  Replace the 
harness.

Case 2

Cause

Motor lock, motor rpm abnormality, motor 
overcurrent, intrusion of foreign material

Check and 
Remedy

Case 3

Cause

Desk control PWB failure, desk tray 1 lift motor 
failure, DLUD1 sensor failure. 

Check and 
Remedy

Replace the desk control PWB, desk tray 1 lift 
motor, or  DLUD1 sensor.

Content

Desk tray 2 lift-up motor trouble

Description

Desk tray 2 lift-up operation failure

Case 1

Cause

Defective connection or disconnection of 
connector and harness

Check and 
Remedy

Check the connectors and the harnesses of 
the desk control PWB, lift motor line, and 
paper feed unit line. 
Connect the connector properly.  Replace the 
harness.

Case 2

Cause

Motor lock, motor rpm abnormality, motor 
overcurrent, intrusion of foreign material

Check and 
Remedy

Case 3

Cause

Desk control PWB failure, desk tray 2 lift motor 
failure, DLUD2 sensor failure

Check and 
Remedy

Replace the desk control PWB, desk tray 2 lift 
motor, or  DLUD2 sensor. 

Content

Desk transport motor trouble

Description

Desk transport motor operation failure

Case 1

Cause

Defective connection or disconnection of 
connector and harness

Check and 
Remedy

Check the connector and the harness in the 
motor line. 
Connect the connector properly.  Replace the 
harness.

Case 2

Cause

Motor lock, motor rpm abnormality, motor 
overcurrent, intrusion of foreign material

Check and 
Remedy

Case 3

Cause

Desk control PWB failure, transport motor 
failure

Check and 
Remedy

Replace the desk control PWB or the transport 
motor.

Content

Desk incompatibility trouble

Description

User attempted to connect a desk incompatible with MX-
DEX1/DEX2. 

Case 1

Cause

User attempted to connect an MX-DEX1/
DEX2-incompatible desk such as MX-DEX3/
DEX4.

Check and 
Remedy

Connect MX-DEX1/DEX2.

MX-DEX1/DEX2  SELF-DIAGNOSIS AND TROUBLE CODES  9 – 3

 

 

 

 

 

U6

00

Desk communication trouble

Desk

Desk communication is made.

Turn OFF and back ON the power.

01

Desk tray 1 lift-up motor trouble

Desk

Tray is being lifted.

Check connections, etc.

02

Desk tray 2 lift-up motor trouble

Desk

Tray is being lifted.

Check connections, etc.

10

Desk transport motor trouble

Desk

Paper is fed.

Check connections, etc.

50

Desk incompatibility trouble

Desk

The power is turned ON.

Check connections, etc.

Content

Desk communication trouble

Description

Communication error with the desk;  communication line test 
error after turning on the power or canceling an exclusive 
SIM.

Case 1

Cause

Defective connection or disconnection of 
connector and harness

Check and 
Remedy

Check the connector and the harness in the 
communication line.  Connect the connector 
properly. 
Replace the harness.

Case 2

Cause

Desk control PWB failure
Control PWB (PCU) failure

Check and 
Remedy

Replace the desk control PWB.  Replace the 
control PWB (PCU).

Case 3

Cause

Malfunction caused by electrical noise

Check and 
Remedy

Cancel by turning OFF/ON the power.

Content

Desk tray 1 lift-up motor trouble

Description

Desk tray 1 lift-up operation failure

Case 1

Cause

Defective connection or disconnection of 
connector and harness

Check and 
Remedy

Check the connectors and the harnesses of 
the desk control PWB, lift motor line, and paper 
feed unit line. 
Connect the connector properly.  Replace the 
harness.

Case 2

Cause

Motor lock, motor rpm abnormality, motor 
overcurrent, intrusion of foreign material

Check and 
Remedy

Case 3

Cause

Desk control PWB failure, desk tray 1 lift motor 
failure, DLUD1 sensor failure. 

Check and 
Remedy

Replace the desk control PWB, desk tray 1 lift 
motor, or  DLUD1 sensor.

Content

Desk tray 2 lift-up motor trouble

Description

Desk tray 2 lift-up operation failure

Case 1

Cause

Defective connection or disconnection of 
connector and harness

Check and 
Remedy

Check the connectors and the harnesses of 
the desk control PWB, lift motor line, and 
paper feed unit line. 
Connect the connector properly.  Replace the 
harness.

Case 2

Cause

Motor lock, motor rpm abnormality, motor 
overcurrent, intrusion of foreign material

Check and 
Remedy

Case 3

Cause

Desk control PWB failure, desk tray 2 lift motor 
failure, DLUD2 sensor failure

Check and 
Remedy

Replace the desk control PWB, desk tray 2 lift 
motor, or  DLUD2 sensor. 

Content

Desk transport motor trouble

Description

Desk transport motor operation failure

Case 1

Cause

Defective connection or disconnection of 
connector and harness

Check and 
Remedy

Check the connector and the harness in the 
motor line. 
Connect the connector properly.  Replace the 
harness.

Case 2

Cause

Motor lock, motor rpm abnormality, motor 
overcurrent, intrusion of foreign material

Check and 
Remedy

Case 3

Cause

Desk control PWB failure, transport motor 
failure

Check and 
Remedy

Replace the desk control PWB or the transport 
motor.

Content

Desk incompatibility trouble

Description

User attempted to connect a desk incompatible with MX-
DEX1/DEX2. 

Case 1

Cause

User attempted to connect an MX-DEX1/
DEX2-incompatible desk such as MX-DEX3/
DEX4.

Check and 
Remedy

Connect MX-DEX1/DEX2.

MX-DEX1/DEX2  SELF-DIAGNOSIS AND TROUBLE CODES  9 – 3

 

 

 

 

 

U6

00

Desk communication trouble

Desk

Desk communication is made.

Turn OFF and back ON the power.

01

Desk tray 1 lift-up motor trouble

Desk

Tray is being lifted.

Check connections, etc.

02

Desk tray 2 lift-up motor trouble

Desk

Tray is being lifted.

Check connections, etc.

10

Desk transport motor trouble

Desk

Paper is fed.

Check connections, etc.

50

Desk incompatibility trouble

Desk

The power is turned ON.

Check connections, etc.

Content

Desk communication trouble

Description

Communication error with the desk;  communication line test 
error after turning on the power or canceling an exclusive 
SIM.

Case 1

Cause

Defective connection or disconnection of 
connector and harness

Check and 
Remedy

Check the connector and the harness in the 
communication line.  Connect the connector 
properly. 
Replace the harness.

Case 2

Cause

Desk control PWB failure
Control PWB (PCU) failure

Check and 
Remedy

Replace the desk control PWB.  Replace the 
control PWB (PCU).

Case 3

Cause

Malfunction caused by electrical noise

Check and 
Remedy

Cancel by turning OFF/ON the power.

Content

Desk tray 1 lift-up motor trouble

Description

Desk tray 1 lift-up operation failure

Case 1

Cause

Defective connection or disconnection of 
connector and harness

Check and 
Remedy

Check the connectors and the harnesses of 
the desk control PWB, lift motor line, and paper 
feed unit line. 
Connect the connector properly.  Replace the 
harness.

Case 2

Cause

Motor lock, motor rpm abnormality, motor 
overcurrent, intrusion of foreign material

Check and 
Remedy

Case 3

Cause

Desk control PWB failure, desk tray 1 lift motor 
failure, DLUD1 sensor failure. 

Check and 
Remedy

Replace the desk control PWB, desk tray 1 lift 
motor, or  DLUD1 sensor.

Content

Desk tray 2 lift-up motor trouble

Description

Desk tray 2 lift-up operation failure

Case 1

Cause

Defective connection or disconnection of 
connector and harness

Check and 
Remedy

Check the connectors and the harnesses of 
the desk control PWB, lift motor line, and 
paper feed unit line. 
Connect the connector properly.  Replace the 
harness.

Case 2

Cause

Motor lock, motor rpm abnormality, motor 
overcurrent, intrusion of foreign material

Check and 
Remedy

Case 3

Cause

Desk control PWB failure, desk tray 2 lift motor 
failure, DLUD2 sensor failure

Check and 
Remedy

Replace the desk control PWB, desk tray 2 lift 
motor, or  DLUD2 sensor. 

Content

Desk transport motor trouble

Description

Desk transport motor operation failure

Case 1

Cause

Defective connection or disconnection of 
connector and harness

Check and 
Remedy

Check the connector and the harness in the 
motor line. 
Connect the connector properly.  Replace the 
harness.

Case 2

Cause

Motor lock, motor rpm abnormality, motor 
overcurrent, intrusion of foreign material

Check and 
Remedy

Case 3

Cause

Desk control PWB failure, transport motor 
failure

Check and 
Remedy

Replace the desk control PWB or the transport 
motor.

Content

Desk incompatibility trouble

Description

User attempted to connect a desk incompatible with MX-
DEX1/DEX2. 

Case 1

Cause

User attempted to connect an MX-DEX1/
DEX2-incompatible desk such as MX-DEX3/
DEX4.

Check and 
Remedy

Connect MX-DEX1/DEX2.