HP OfficeJet Pro 7740 Troubleshooting Tips

If you saw these error messages on your HP OfficeJet Pro 7740 printer,

then the pins of the internal printhead may be damaged.

To check, remove all the ink cartridges and just use a flash light to verify if the pins are damaged.

If it is confirmed that the printhead pins are damaged or broken then the printhead will need to be replaced.

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