Question about Epson TM U375 Matrix Label Printer

6 Answers

Epson TM-U375 hey what is causing our 375's to not print on the left side? I have cleaned the head and ran the self test, but it doesn't print on the left side at all.

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  • Anonymous Jul 03, 2008

    TM-U375

  • mt0ne Aug 08, 2008

    I have 2 machines with this exact problem...
    Any ideas? It has nothing to do with the screw on the print head, that much I pretty sure about.



  • ppieklo Sep 04, 2008

    Same as Tigerweld's. During self-test, first 9 or 10 columns on left either do not print any characters or some characters randomly. Cleaning head improved greatly, close, but no cigar. Installed new print head which performed WORSE than the original. Cleaned contacts of ribbon cable into P. Head. No help. Looking to dig deeper into printer to examine ribbon cable connections, anything else on the inside.

    Must be a circuit bd. logic circuit component failure???

  • Troy Scott
    Troy Scott Oct 16, 2008

    Hey guys, I figured out what was causing it. Replace the ribbon! Seems this is the weak link of this model. I know it sounds crazy, but after we replaced the ribbons it worked for ALL of them and we repalced over 20 of them. We believe it somehow breaks the wires ( for lack a better word ) inside the ribbon and when it moves across to the right side it looses it's connection. If you want the dealer we use you will have to wait until I get back from vacation to look it up. They were reasonably cheap.



    The screw missing was by design. It was to save money on assembly. You only need the one. We use electrical contact cleaner to clean the heads with. It can be messy so be careful not to get the over spray on your clothes! Be sure and blow the printer out with air on a regular basis too.



    btw, you can test your printer by holding, I think the feed button while you cut it on. It will make a bunch of noise and quit. The light will be blinking. Release the button and press it again and it will run a print test, about 3' long. I think if you hold the feed button while cutting it on it will run a validation test. You will need to feed a slip to start the test. Again, I'm not at work and I don't have the printer in front of me so I may be backwards on the two buttons!



    One last btw, when you are taking it again to replace the ribbon be careful to note where the screws go. There are different sizes!



    I hope this helps you guys! My trial and error paid off I hope!

  • Troy Scott
    Troy Scott Oct 16, 2008

    btw, when I say 'ribbon' I mean the ribbon to the head, not the ink ribbon.

  • joshcall Jan 15, 2009

    OK, def not the ribbon cartridge, tried 2 brand new ones... no luck, still only prints right half of receipt!!

    Anyone got a part number for the data cable going to the print head??
    I think that's the most likely part that's failed.

    Anyone else with advice on these TMU375's printing half a receipts???!??

    Thanks!!!!!


  • Anonymous Apr 06, 2009

    even after changing the ribbon on the printer, the print is very light on the receipts, espically on the dollar amount on the right side of the ticket. It prints well on the teller tape.

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6 Answers

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The Print head ribbon cable is 99% of the problems on printing! Don't worry about any cable coming from the unit to the machine itself. Now there is a Platen bar that the ink ribbon presses on to print. So if is light on one side or both you can adjust that! Go from the back side or the unit, you should see a black box thing. On each side is adjustments, stick a flat head, small, screwdriver in there and turn it. Be careful!!! You do not want to turn to hard it is plastic and will strip!!! That will adjust your platen bar.

If any more problems let me know! I work on these everyday!! Welch Systems Inc. Peoria, IL

Posted on Mar 08, 2010

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I have a part number of 2014551 for the printhead cable. I use compassmicro.com for all my epson parts

Posted on May 18, 2010

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Does anyone have the part number for the printhead cable, instructions for replacement, and a vendor to buy from?

Posted on Sep 22, 2009

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The problem is the printhead cable. I've had this problem numerous times and it fixes it every time.

Posted on Oct 15, 2008

Found manual but not really any help, in ref to head assembly. I guess I will figure it out on my own, here is the link if you need it.
http://content.epson.de/fileadmin/content/files/RSD/AnwenderhandPDFs/DE/TM-U375_user_e.pdf

Posted on Jul 03, 2008

Look at the head assembly, notice it has only one screw, it appears the one on the left is missing, hmmm just like the side that doesn't print. I have been trying to find a repair manual for this, so I can fingure out how to adjust the head, once I add the missing screw if one goes there. All my printers are like that, so I dont know if one really goes there, haven't tried.

Posted on Jul 03, 2008

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