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‎01-15-2023 09:31 AM

HP Recommended
Product: HP LaserJet Pro 400 color Printer M451dw
Operating System: macOS 10.13 High Sierra

Loud moaning noise when printing. Appears to come from duplex unit / back of machine

 

For example if a Cleaning Page is printed

- paper feeds quietly

- paper prints side 1 quietly

-printer retrieves paper to duplex unit quietly

-as printer begins printing reverse side of page, it makes a very loud grinding /moaning noise

- when printer has fed perhaps 1/3 of page it goes (quite properly) to a step by step mode

- at this point the grinding continues for a short while and then ceases

- the printer steps the page forwards until printing is complete quietly

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