MX-DEX1 (serv.man11). Section 9 - Self-Diagnosis and Trouble Codes . — Sharp Copying Equipment Service Manual (repair manual)

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MX-DEX1 (serv.man11)
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Copying Equipment / Section 9 - Self-Diagnosis and Trouble Codes .
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MX-DEX1/DEX2  SELF-DIAGNOSIS AND TROUBLE CODES  9 – 1
Service Manual      
 
[9] SELF-DIAGNOSIS AND 
TROUBLE CODES
1. Simulations
A. Sensor Check
1)
When you run SIM 4-2 using the keypad on the main unit, the
following screen appears and you can monitor changes in sen-
sor status. 
* When a sensor turns ON, the corresponding sensor name is
highlighted. 
* The [
↑] button can be used to move to the previous page.
This button is, however, enabled only when there is one or
more pages that precede the current page.  When there is
no page that precedes the current page, this button is dis-
abled and grayed out.  The [
↓] button can be used to move
to the next page. This button is, however, enabled only when
there is one or more pages that follow the current page.
When there is no page that follows the current page, this
button is disabled and grayed out. 
* You can exit from SIM mode by pressing the [CA] key. 
* You can return to the SUB number entry screen by pressing
the [SYSTEM SETTING] key. 
<Desk Sensors>
B. Load Operation Check
1)
Run SIM 4-3 using the keypad on the main unit.  The following
screen appears: 
2)
Select one or more loads you want to operate (in this example,
[DPFM]).  When you select the button that corresponds to a
load, the button is highlighted.  The button is unhighlighted
when you press it again. 
3)
Press the [EXECUTE] button to operate the selected load(s). 
While the load or loads are operating, the [EXECUTE] button
is highlighted. 
* Alternatively, you can press the [EXECUTE] button without
selecting any load; in this case, the [EXECUTE] button is
highlighted to indicate that you are in Execute mode.  When,
in this mode, you press the button that corresponds to a load
you want to operate, the load immediately starts operating. 
* While one or more loads are operating, you can stop the
operation or add another load. 
* Pressing the [EXECUTE] button stops the currently operat-
ing load(s); the [EXECUTE] button then becomes unhigh-
lighted. 
* You can return to the SUB number entry screen by pressing
the [SYSTEM SETTING] key. 
* You can exit from SIM mode by pressing the [CA] key. 
<Desk load items>
C. Synchronizing Signal Check
1)
Run SIM 4-5 using the keypad on the main unit. 
The following screen appears (initially, both DTRC and LTRC
are OFF): 
2)
Select [LTRC] and press the button. 
The system starts checking the "turn ON" behavior, and dis-
plays the result of the check (the indicator changes to "ON" if
normal, or remains "OFF" if abnormal). 
3)
Select [LTRC] (now highlighted) and press the button. 
The system starts checking the "turn OFF" behavior, and dis-
plays the result of the check (the indicator changes to "OFF" if
normal, or remains "ON" if abnormal). 
* You can exit from SIM mode by pressing the [CA] key. 
* You can return to the SUB number entry screen by pressing the
[SYSTEM SETTING] key. 
 Displayed name
 Sensor name
 DCSI1
 Desk 1 attachment sensor
 DPFD1
 Desk 1 transport sensor
 DLUD1
 Desk 1 upper limit sensor
 DPED1
 Desk 1 paper presence sensor
 DCSPD1
 Desk 1 paper level sensor
 DCSS11
 Desk 1 rear edge switch 1
 DCSS12
 Desk 1 rear edge switch 2
 DCSS13
 Desk 1 rear edge switch 3
 DCSS14
 Desk 1 rear edge switch 4
 DPWD11
 Desk 1 paper width sensor 1
 DPWD12
 Desk 1 paper width sensor 2
 DCSI2
 Desk 2 attachment sensor
 DPFD2
 Desk 2 transport sensor
 DLUD2
 Desk 2 upper limit sensor
 DPED2
 Desk 2 paper presence sensor
 DCSPD2
 Desk 2 paper level sensor
 DCSS21
 Desk 2 rear edge switch 1
 DCSS22
 Desk 2 rear edge switch 2
 DCSS23
 Desk 2 rear edge switch 3
 DCSS24
 Desk 2 rear edge switch 4
 DPWD21
 Desk 2 paper width sensor 1
 DPWD22
 Desk 2 paper width sensor 2
 DSW_DSK
 Right door open/close sensor
0
DESK/LCC SENSORCHECK
CLOSE
SIMULATION NO.04-02
TEST
1/2
DCSS21
DCSS22
DCSS23
DCSS24
DCS I1
DPFD1
DLUD1
DPED1
DCSPD1
DCSS11
DCSS12
DCSS13
DCSS14
DPWD11
DPWD12
DCSI2
DPFD2
DLUD2
DPED2
DCSPD2
 Displayed name
 Description
 DPFM
 Desk main motor
 DLUM1
 Desk 1 lift-up motor
 DPUC1
 Desk 1 paper feed clutch
 DLUM2
 Desk 2 lift-up motor
 DPUC2
 Desk 2 paper feed clutch
 DTRC
 Desk transport clutch
0
SIMULATION NO.04-03
TEST
DESK/LCC LOAD CHECK
EXECUTE
1/1
DPFM
DLUM1
DPUC1
DLUM2
DPUC2
DTRC
CLOSE
CLOSE
1/1
SIMULATION NO.04-05
TEST
DESK/LCC SYNCRONIZING SIGNAL CHECK
DTRC
LTRC
DTRC OFF
LTRC OFF
0
MX-DEX1/DEX2  SELF-DIAGNOSIS AND TROUBLE CODES  9 – 2
<Button Description>
2. Self-diagnosis
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. 
A. Functions and Objectives
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. 
B. Types of Self-diagnosis Messages
Self-diagnosis messages can be classified into the following types: 
C. How Self-diagnosis Works
(1) Self-diagnosis and Troubleshooting Workflow
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.   
 Button
 Description
 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
3. Trouble Code List
4. Trouble Code Details
 
U6-00 Desk communication trouble
 
U6-01 Desk tray 1 lift-up motor trouble
 
U6-02 Desk tray 2 lift-up motor trouble
 
U6-10 Desk transport motor trouble
 
U6-50 Desk incompatibility trouble
Main 
code
Sub 
code
Description
Section
Can occur when
Solution
Remarks
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.
Page of 3

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Here you can view online or download Sharp MX-DEX1 (serv.man11) Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sharp MX-DEX1 (serv.man11) Copying Equipment. Information contained in Sharp MX-DEX1 (serv.man11) service manual (repair manual) typically includes:

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  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).