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The HP 842c was introduced in 2000. Like most old printers, the cartridges are large and lasted for a long time, and were overengineered. However, it uses a tri-color cartridge which makes it so one color running out ends the entire cartridge.

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Repair Manual or tear down instructions

HP Deskjet 842C printer

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HP has a very useful site walking you through the basic issues give it a try HP DIAGNOSTIC SOLUTIONS

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