How to Fix a Damaged Print Head at Minimal Cost.
pay attention ! The following fix resolves problems that arise from the printhead contact borad only, and does not resolve any more complex problems.
To purchase the part:
https://www.aliexpress.com/item/932-933-950-951-PrintHead-Print-Head-pen-Holder-Rack-Chip-contactor-sensor-for-HP-8100/32343886451.html?spm=2114.search0104.3.8.55af2b581zXqdT&ws_ab_test=searchweb0_0,searchweb201602_4_10152_10151_10065_10344_10068_10342_10343_10340_10341_10084_10083_10618_10630_10307_5711211_5722315_10313_10059_10534_100031_10103_10627_10626_10624_10623_10622_10621_10620_5711313_10142-10152_10151,searchweb201603_36,ppcSwitch_5&algo_expid=8a80df9b-d2e2-4e29-862c-ae66ea33d87e-1&algo_pvid=8a80df9b-d2e2-4e29-862c-ae66ea33d87e&transAbTest=ae803_5&priceBeautifyAB=0
Good luck!