MX240/ MX340/ MX640 Series
SERVICE
MANUAL
THERMAL TRANSFER / DIRECT THERMAL
BAR CODE PRINTER
i
MX240/ MX340/ MX640
Bar Code Printer Service Manual
TABLE OF CONTENT
1. FUNDAMENTAL OF THE SYSTEM .......................................................................... 1
1.1. Overview ................................................................................................................. 1
2. ELECTRONICS .......................................................................................................... 5
2.1 Summary of Board Connectors ............................................................................. 5
2.2 Interface Pin Configuration .................................................................................... 7
3. MECHANISM ............................................................................................................. 8
3.1 Remove the Lower Front Panel ............................................................................. 8
3.2 Remove the Electronics Cover .............................................................................. 9
3.3 Remove the Media Cover ..................................................................................... 11
3.4 Replacing the Platen Roller Assembly ................................................................ 12
3.5 Replacing the Print head ASS’Y .......................................................................... 13
3.6 Replacing the LCD Panel Module ........................................................................ 16
3.7 Replacing the LCD Control PCB-A & LCD Touch Panel Assembly .................. 17
3.8 Replacing the Front Panel Buttons Rubber Pad & Buttons Control PCB-A .... 19
3.9 Replacing the Label Supply Spindle ................................................................... 20
3.10 Replacing the Label Supply Spindle DC Motor ................................................ 21
3.11 Replacing the Power Supply Unit ...................................................................... 23
3.12 Replacing Multi-interface Board ........................................................................ 24
3.13 Replacing the Main Board .................................................................................. 26
3.14 Replacing the Stepping Motor Assembly ......................................................... 28
3.15 Replacing the Gap/Black Mark Sensor Module ................................................ 29
3.16 Cutter Module Installation (Option) ................................................................... 30
3.17 Peel-off Kit Installation (Option) ........................................................................ 33
3.18 Internal Rewinding Kit Installation (Option) ..................................................... 42
4. TROUBLESHOOTING ............................................................................................. 47
4.1 Common Problems ............................................................................................... 47
4.2 Mechanism Fine Adjustment to Avoid Ribbon Wrinkles ................................... 51
4.3 Adjusting Heater Line ........................................................................................... 53
5. MAINTENANCE ....................................................................................................... 58
UPDATE HISTORY ...................................................................................................... 60
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MX240/ MX340/ MX640
Bar Code Printer Service Manual
1. FUNDAMENTAL OF THE SYSTEM
1.1. Overview
Front View
1. LED indicators
2. Touch screen LCD display
3. Front panel buttons
4. USB host x 2
5. Media view window
6. Paper exit chute
7. Media cover
2
1
3
4
6
7
5
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MX240/ MX340/ MX640
Bar Code Printer Service Manual
Interior View
1. Ribbon rewind spindle
2. Print head release lever
3. Media sensor position
adjustment knob
4. Rear paper feed roller
release lever
5. Ribbon supply spindle
6. Ribbon tension adjustment
knob
7. Label supply spindle
8. Rear label guide
9. Fan-fold media entrance chute
10. Print head pressure adjustment knobs
11. Platen roller
12. Print head
13. Media sensor
14. Front label guide
2
1
3
4
6
7 5 8 9 10
11
12
13
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MX240/ MX340/ MX640
Bar Code Printer Service Manual
Rear View
1. External label entrance chute
2. Power cord socket
3. Power switch
4. External Bluetooth or WiFi module (Option)
5. RS-232C interface
6. GPIO interface (Option)
7. Ethernet interface
8. SD* card socket
9. USB interface
10. Centronics interface
11. USB host x 2 (ption)
1
3
2
4
7
6
5
8
9
10
11
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MX240/ MX340/ MX640
Bar Code Printer Service Manual
* Recommended SD card specification.
SD card spec
SD card capacity
Approved SD card manufacturer
SDHC Class 10
32 GB
Transcend, Kingston, Sandisk
SDHC Class 10
16 GB
Kingston
Class 4
microSD 4 GB
Transcend, Kingston
Class 10
microSD 8 GB
Transcend, Kingston, Sandisk
Class 10
microSD 16 GB
Kingston, Sandisk
Class 10
microSD 32 GB
Kingston
Class 10 UHS-I
microSD 16 GB
Transcend, Sandisk
Class 10 UHS-I
microSD 32 GB
Transcend, Sandisk
- The DOS FAT file system is supported for the SD card.
- Folders/files stored in the SD card should be in the 8.3 filename format
- The miniSD/microSD card to SD card slot adapter is required.
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MX240/ MX340/ MX640
Bar Code Printer Service Manual
2. ELECTRONICS
2.1 Summary of Board Connectors
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MX240/ MX340/ MX640
Bar Code Printer Service Manual
Main board
Connector
Description
1
USB Host connector
2
Front USB Host connector
3
WiFi Module connector
4
Parallel Port board connector
5
GPIO interface board connector
6
Head open sensor connector
7
Gap sensor connector
8
Ribbon encoder sensor connector
9
Power supply output (24V DC) connector
10
BM Sensor connector
11
Paper roller open sensor connector
12
LCD Power & LED Power connector
13
Paper Distance Sensor connector
14
RFID module connector
15
Print head connector
16
LCD panel connector
17
Ribbon end sensor connector
18
TPH Power (24V DC) connector
19
Stepping motor connector
20
DC motor connector
21
Cutter/peel-off connector
22
Paper REWIND connector
23
Micro processor
24
Paper damper sensor connector
25
RS-232C connector
26
Ethernet interface
27
SD card socket
28
USB interface
29
USB host x 2 (Option)
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MX240/ MX340/ MX640
Bar Code Printer Service Manual
2.2 Interface Pin Configuration
RS-232C
PIN
CONFIGURATION
1
+5 V
2
TXD
3
RXD
4
CTS
5
GND
6
RTS
7
N/C
8
RTS
9
N/C
USB
PIN
CONFIGURATION
1
N/C 2 D- 3 D+
4
GND
Ethernet
PIN
CONFIGURATION
1
Tx+
2
Tx-
3
Rx+
4
N/C
5
N/C
6
Rx-
7
N/C
8
N/C
8
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MX240/ MX340/ MX640
Bar Code Printer Service Manual
3. MECHANISM
3.1 Remove the Lower Front Panel
Remove 2 screws to remove lower front panel.
Screws
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MX240/ MX340/ MX640
Bar Code Printer Service Manual
3.2 Remove the Electronics Cover
1. Open printer media cover to remove 1 screw inside the printer.
2. Remove 6 screws on electronics cover.
Screws
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Bar Code Printer Service Manual
3. Open the media cover about 20 ~30 degree then take electronics cover out from the
printer. Please refer to the following pictures.
Step 1: Open
the media cover
about 20~30
degrees
Step 2: Take out the
electronics cover
Electronics cover
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Bar Code Printer Service Manual
3.3 Remove the Media Cover
1. Remove the electronics cover.
2. Remove 3 screws from each hinge. Be careful the media cover may fall out from the
printer.
3. Take out the media cover from the printer.
Screws
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Bar Code Printer Service Manual
3.4 Replacing the Platen Roller Assembly
1. Open printer media cover.
2. Disengage print head release lever.
3. Remove 3 screws from the platen holder.
4. Take out the platen holder, tear bar and platen roller assembly and replace a new platen
roller assembly.
5. Reassemble the parts in the reverse procedures.
Screws
Platen roller assembly
Holder
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Bar Code Printer Service Manual
3.5 Replacing the Print head ASS’Y
1. Loosen the print head secure screw counterclockwise until it can be taken out from the
mechanism.
2. Disengage the print head release lever.
3. Carefully disconnect connectors from the print head assembly. Please do not pull the
cable to right and left side alternatively in order to disconnect it from the print head
connector. Please use the flat screw driver to push at the key in the middle of the
connector. When the connector becomes loose from the print head connector, you can
disconnect it.
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Bar Code Printer Service Manual
4. Remove/Replace the print head assembly.
5. Connect the print head cable and carefully slide print head assembly into the print
mechanism. Make sure the two locating protrusion pins on the print mechanism mounting
plate snap into the locating holes on the print head.
Locating
protrusions
Locating
protrusions
Locating
holes
Locating
holes
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Bar Code Printer Service Manual
6. Check the print head has been totally closed to the print mechanism before secure the
print head by the previously removed thumbscrew.
7. Reassemble the parts in the reverse procedures.
Note: Please use the come with new print head secure screw to replace the print head
assembly. DO NOT re-use the original screw.
Locating
holes
Locating
holes
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MX240/ MX340/ MX640
Bar Code Printer Service Manual
3.6 Replacing the LCD Panel Module
1. Follow the previous step to remove the electronics cover.
2. Remove the marked fix LCD panel module two screws.
3. Remove the module connecting cable & harness.
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Bar Code Printer Service Manual
4. Reassemble the parts in the reverse procedures.
3.7 Replacing the LCD Control PCB-A & LCD Touch Panel
Assembly
1. Remove the FPC harness from the LCD control PCB-A
2. Remove the marked four fix screws from the LCD control PCB-A, then you can take off
the PCB-A
3. Remove the four fix screws from the LCD holder, then you can take off the holder & touch
panel.
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