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ME240/ ME340
THERMAL TRANSFER / DIRECT THERMAL
BAR CODE PRINTER
SERVICE
MANUAL
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TABLE OF CONTENT 1. FUNDAMENTAL OF THE SYSTEM .......................................................................... 1 1.1. Overview ................................................................................................................. 1 2. ELECTRONICS .......................................................................................................... 5 2.1 Summary of Board Connectors ................
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1. FUNDAMENTAL OF THE SYSTEM 1.1. Overview Front View 1 2 6 3 4 7 5 1. LED indicators 1 2. Pause key 3. Feed key 8 4. Paper exit chute 5. Lower front cover 6. Media viewer 9 7. Printer right side cover opener 8. LCD (Option) 9. Keys for LCD module (Option) 1
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Interior View 1 6 7 2 8 3 4 9 10 5 1. Ribbon rewind spindle 2. Ribbon supply spindle 3. Print head pressure adjustment knob 4. Ribbon end sensor 5. Print head release lever 11 6. Label roll guard 7. 3” core adapter 8. Label supply spindle 12 9. Ribbon guide bar 10. Media guide bar 11. Print head 12. Platen roller 13. Media sensor 13 14 14. Label guide 2
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Rear View 5 1 6 2 7 3 8 4 9 1. Internal Ethernet interface (Option) 2. Fan-fold paper entrance chute 3. RS-232C interface (Max. 115,200 bps) 4. USB interface (USB 2.0/ Full speed mode) *5. SD card slot 6. Centronics interface (Option) 7. USB host (Option) 8. Power switch 9. Power jack socket Note: The interface picture here is for reference only. Please refer to the product specification for the i
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V1.0, V1.1 microSD 1 GB Transcend, Panasonic V2.0 SDHC CLASS 4 microSD 4 GB Panasonic V2.0 SDHC CLASS 6 microSD 4 GB Transcend V1.0, V1.1 miniSD 128 MB Transcend, Panasonic V1.0, V1.1 miniSD 256 MB Transcend, Panasonic V1.0, V1.1 miniSD 512 MB Transcend, Panasonic V1.0, V1.1 miniSD 1 GB Transcend, Panasonic V2.0 SDHC CLASS 4 miniSD 4 GB Transcend V2.0 SDHC CLASS 6 miniSD 4 GB - The DOS FAT file system is support
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2. ELECTRONICS 2.1 Summary of Board Connectors Main board 7 12 3 13 8 9 14 4 15 16 10 6 17 2 11 5 18 1 19 5 5
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Connector Description 1 USB connector 2 RS-232C connector 3 SD card slot Ethernet RJ-45 connector (Option) 4 5 USB host connector (Option) 6 Micro processor Head open sensor connector Pin Description Voltage Head open sensor emitter 1 1.2~1.4V power pin 7 2 GND 0V Head open sensor 0V: Head close 3 receiver 3.3V: Head open 4 GND 0V 8 RFID module connector Recovery connector 9 Ribbon near end sensor c
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Pin Description Voltage 1 Ribbon sensor receiver A/D: 0~3.3V Ribbon sensor emitter 2 5V power pin 3 GND 0V 4.0~4.1V: Emitter on 4 Ribbon sensor emitter 4.3~4.4V: Emitter off Cutter/peel-off sensor connector Pin Description Voltage 1 GND 0V 2 Cutter power 24V 4.0~4.1V: Emitter on 3 Peel sensor emitter 4.3~4.4V: Emitter off 16 4 Logic power 5V Cutter position sensor 0V: Cutter stop 5 switch 3.3V: C
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Centronics-interface board 1 3 2 Connector Description Remark 1 Centronics soft cable connector 2 Centronics power connector 3 Centronics port connector 8 8
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2.2 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 Centronics Pin SPP Mode Nibble In/Out 1 Strobe N/A In 2-9 Data 0-7 N/A In 10 Ack N/A Out 11 Busy N/A Out 12 Paper Out / End N/A Out 13 Select N/A Out 14 Ground N/A GND 15 No Defined N/A N/A 16-17 Ground N/A GND 18 No Defined N/A N/A 19-30
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Ethernet PIN CONFIGURATION 1 Tx+ 2 Tx- 3 Rx+ 4 N/C 5 N/C 6 Rx- 7 N/C 8 N/C 10 10
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3. MECHANISM 3.1 Remove the Electronics Cover 1. Remove three screws on back of the printer. Screws 2. Open printer right side cover and remove one screw then close the cover. Screws 3. Remove the electronics cover. Electronics cover 4. Reassemble the parts in the reverse procedures. 11 11
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3.2 Remove the Right Side Cover 1. Open printer right side cover and remove four screws to remove the printer right side cover. 2. Reassemble the parts in the reverse procedures. Screws Screws 12 12
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3.3 Replacing the Key/LCD Panel Module 1. Refer to section 3.1 to remove the electronics cover. 2. Disconnect harness from the Key/LCD panel module. 3. Push two tabs to remove/replace the Key/LCD panel module. Key Panel Module LCD Panel Module (Option for Basic model) PUSH PUSH PUSH PUSH 4. Reassemble the parts in the reverse procedures. 13 13
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3.4 Replacing the Main Board 1. Refer to section 3.1 to remove electronics cover. 2. Remove two screws on the power jack socket then pull out the socket. 3. Disconnect all connectors from the main board. Note: You should press the tab of power supply harness when disconnect the power supply connector. The connector to power supply The tab of harness 14 14
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4. Remove four screws on the main board. Screws Screws 4. Replace the main board. 5. Reassemble the parts in the reverse procedures. 15 15
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3.5 Replacing the Power Supply Unit 1. Refer to section 3.4 to remove the main board. 2. Disconnect two connectors from the power switch. 3. Take off the power supply cover (black mylar). Disconnect two connectors and remove four screws on the power supply unit. Screws Screws 3. Replace the power supply unit. 4. Reassemble the parts in the reverse procedures. 16 16
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3.6 Replacing the Stepping Motor 1. Refer to section 3.1 to remove the electronics cover. 2. Disconnect the stepping motor connector. Stepping motor connector 3. Remove three screws on the stepping motor. Screws 4. Replace the stepping motor. 5. Reassemble the parts in the reverse procedures. 17 17
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3.7 Replacing the Platen Roller Assembly 1. Open printer right side cover. 2. Disengage the print head lift lever. 3. Remove one screw to remove the lower front cover. Lower front cover Screw 4. Remove one screw on the platen right side bushing. Screws 5. Disengage the platen left side bushing tab from the printer. Left side bushing tab 18 18
