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Monochrome laser printer introduced in 2012. The printer has a 35 PPM page rating and the first page comes out in 8 seconds. Depending on which model you own, you will have different expansion options and available features (Ex: M401n is limited to 128MB of RAM, despite having space for a memory module and a access panel). Uses HP 80A/80X toner cartridges.

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Upgrade memory from 128 MB to 256 MB

How do I remove and replace the MAIN memory module in a HP LaserJet 400 M401n?

I see the “access door”, but that is only for ADD-ON memory, correct? Where is the main 128 MB module? I simply want to remove it, and replace it witha 256 MB module.

Отвечено! View the answer У меня та же проблема

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I believe the first 128 MB of RAM is soldered onto the logic board. The socket is there to allow you to add RAM.

Install memory DIMM’s

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Thanks! I was incorrectly assuming that the initial 128 MB was a removable module. The manual only lists proprietary font modules as being acceptable for add-ons. I will try it, but I am thinking now that the printer may not be able to address all 256 MB on the module that I purchased.

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HP officially doesn’t support memory upgrades on the M401 series. It has the slot, but they do not sell the modules to do so. On top of this, the module is proprietary and isn’t based on a SODIMM or proprietary module derived from the SODIMM format. It’s very likely the M401n firmware has a bit that prevents more then 128MB of RAM.

The slot is likely there for HP to add additional memory to the higher end models without multiple formatter boards. That said HP may have designed the board to take multiple capacities and abandoned the slot.

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Their guide implies it can be added and here's the DIMM for it 256MB Memory Upgrade for HP LaserJet Pro 400

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Not on the M401N model/Series. I'm not able to pull mine out to show you without moving my Vista 32 games system.

I'll move the computer if you want to see the slot since I own a proprietary slot printer. It's awkward so I'm only going to do it if you genuinely need to see the slot.

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@danj in lieu of moving the printer, this is the M401n/a formatter board.

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