Question about HP Deskjet 6940 InkJet Printer

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Cartridge errors on HP97 / bad TSR?

Hello Bob-

I hope you don't mind me directly asking you a question regarding strange behavior on several HP 9- series cartridges I have here at work. I've noticed you have extensive HP experience in printers and I am actually ex-HP as well.

We have several printers: Deskjet 5740, Officejet 7310, Deskjet 6940. I have 3 cartridges (one each 93, 95, 97) that are not accepted by any of these printers- the cartridge light flashes immediately on insertion and when I run the 10-tap it gives stat=8. The specific error and message I have found under the system events section is 69961 "pen in chute 0 has t", which I believe means a TSR failure? Here is the kicker- all 3 cartridges seem to have good TSR's, as measured by my trusty multimeter (in the 70-72 ohm range, like others I have around that are working fine). I also have ruled out printer contact issues as these printers accept many other cartridges well, have had their contacts cleaned, and the cartridge errors are very repeatable only on these particular cartridges. Are you aware of any other reason we could be getting this error message?

Also, if there is a print job in the queue and I run a tap test, the print job then successfully prints with good print quality, so there doesn't seem to be a major electrical issue with these cartridges.

Thanks in advance for your advice!

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Hi Scott -

Sorry, I do not have any additional ideas as it seems you have checked things I would have suggested - cleaning the contacts. (I presume you did clean the cartrdige contacts in addition to the printer contacts.) The TSR may be correct but may be encoded incorrectly, which could cause an issue as this would make the printer "think" the cartridge was too hot or too cold. The printer will refuse to print with certain ID errors. A 10-tap will bypass this test as a diagnostic aid. Does the 10-tap show a "good" nozzle diagnostic? If there are repeating missing nozzle segments across all three colors it would indicate an interconnect issue.

If the cartridges are original HP cartridges I would check the warranty date (two years warranty from date of manufacture) as shown here. If the cartridges are still in the warranty period contact HP for replacements.

Bob Headrick, MS MVP Printing/Imaging

Posted on Jul 03, 2008


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