Hello everyone, I need some help or advice regarding the HP Smart Tank 750 device. I have already checked for paper jams and anything stuck inside, as well as all the flex cables, but I still encounter an E4 error. We have taken it to customer service for inspection, but they don't know how to fix it. Is it possible that the issue lies with the main board or the sensor? I would really appreciate any guidance from those who have experienced this problem. Thank you!...

Hi everyone,
I'm Hakuu, and I'm a new member here. I am a computer technician and also work on printer and laptop repairs. While I'm not a professional at repairing, I am continuously learning. I joined Badcaps because I realized that I need to learn more about schematics and board views. This knowledge will help me improve my repair skills using those resources.
Additionally, I would appreciate any advice from other techs. I hope you can help me with that.
I'm glad to be here. Thank you!
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