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.
crwdns2934109:0crwdne2934109:0
crwdns2934065:0crwdne2934065:0: 479.4crwdns2936485:0crwdne2936485:0
35
329
971
I believe the first 128 MB of RAM is soldered onto the logic board. The socket is there to allow you to add RAM.
crwdns2934105:0crwdne2934105:0
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.
crwdns2934065:0crwdne2934065:0: 88.8crwdns2936485:0crwdne2936485:0
195
260
144
HP officially doesn’t support memory upgrades on the M401 series. It has the slot, but they do not sell memory modules like the p2055 and older models once allowed with a laptop SODIMM. On top of this, the module is proprietary, so HP probably uses it as a service port OR had plans and abandoned it during development. HP solders it to the formatter board on these printers; the M401dne (which I managed to secure for next to nothing with 24k pages, shove the toner DRM whre the sun don't shine HP :-) ) has 256MB onboard, as do the others like the dn, dw, and x (x=dw with paper tray). The n is only 128MB and will ALWAYS BE a 128MB printer.
It's used as an "expansion slot" for these cards:
crwdns2934105:0crwdne2934105:0
Their guide implies it can be added and here's the DIMM for it 256MB Memory Upgrade for HP LaserJet Pro 400
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.
@danj in lieu of moving the printer, this is the M401n/a formatter board.
Years later (and thanks to depreciation), I now have more info from a used dne I got due to the price, which is essentially similar to the dw/dn but uses the 2-line LCD from the n and lacks WiFi, so essentially a cheaper dn. The difference is in the formatter; HP spins the same board but tweaks for the a (not sold in the US), n (base US), dn/dw (touchscreen variant w/USB port), dne (2-line LCD w/o WiFi; same as the dn with the cheaper LCD) and x (see the dw, but with the paper tray in the box). Same board, different Spare# for each unit with 2 RAM configurations. Maybe different firmware for the touchscreen units, but I haven't had any luck with them on the PC front so I overlooked them more than I entertained them; they're all too high for my liking. Plus with these "end of an era" HPs, take what you can get; even a "n".
Even the "new to me" dne had an empty slot; indicating it's not used for much.
crwdns2936751:024crwdne2936751:0 0
crwdns2936753:07crwdne2936753:0 4
crwdns2936753:030crwdne2936753:0 17
crwdns2942667:0crwdne2942667:0 3,127
crwdns2942205:01crwdne2942205:0
HP's help: HP LaserJet Pro 400 Printer M401n
crwdns2934271:0crwdnd2934271:0 Dan crwdne2934271:0