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07-06-2020 12:43 PM
The DJ 800 does not have "Print Head Cartridges", it has "printheads" and "ink Cartridges". And, yes, they will work with ink cartridges that are beyond the 'expiration" date. Printheads will not work if defective, not sure which message you are seeing on the display.
07-07-2020 09:04 AM
You will have to replace the print head. But first try cleaning the printhead contacts and the contacts on the carriage slot with a q-tip and alcohol or water. If that doesn't work use a dental pick, sharp object or small wire brush to clean the contacts on the printhead.
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