asked Aug 19, 2019 at 8:30pm
Unknown Printer

Upgrade 2420 to duplex

I’ve got a 2420 and could get a 2420D (with duplexer), described as having a bad power board. Can I take the duplexer from that and install on mine? Level of difficulty? Firmware issues

PS this says “unknown printer” but I did select the model, etc beforehand. Cannot edit or delete posts here apparently. Also tried to post before with Firefox but it repeatedly errored out so this from Chrome

by Gweilo on Aug 19, 2019 at 8:34pm Add comment

PS2 sorry, if not clear, this is HPLJ 2420.

by Gweilo on Aug 19, 2019 at 8:37pm Add comment

Really hard to swap out the duplexor since you have to disassemble both printers to do it.

by moe on Aug 21, 2019 at 11:03am Add comment

OK, was hoping it was like lego. So will pass.

by Gweilo on Aug 26, 2019 at 12:33am Add comment

Moe, it's impossible to make a new post here now. I think I can still reply so writing this. I tried with Firefox, Chrome, Windows, iPad, Linux.Turned off AdBlocker. All failed, all get "Unable to post" after I do the captchas. .I looked at your Facebook page; people write there they had the same problem, I guess you aren't reading that. Will follow with a new question if this post works.

by Gweilo on Aug 26, 2019 at 3:48am Add comment

OK, my actual question: HPLJ 2420 as above.

I've been using a HP LJ2420 for a few weeks and it was working fine. I connected it via Centronics parallel cable. A day ago it started to have problems. I sent a print and it started to print the PS code. That happens when part of the print stream is lost and the rest is interpreted as plain text. I restarted the printer, killed the job, restarted the PC. A few more print jobs ended the same, then nothing at all: the ready light didn't flash at all as it does when receiving data. Yet the info screen shows "READY". I can print a config page from the menu. I guessed it might be the cable, but the connection looks fine. I don't have a spare to swap (and local shops don't carry them any more). I noticed that there was a small green light flashing next to the parallel port on the printer. I can't find anything about that in the service manual.

The config page says "Direct connect ports (USB/IEEE 1284) : ENABLED".
Pulled the Centronics plug. I tried to connect via the USB port. But plugging that into my Windows PC or a Linux laptop and there is no "Device found".

Got the official HP installer from their site. NO joy.

So getting a bit desperate now. Any idea what could be wrong and is it fixable?
I was planning to get a JetDirect ethernet card: if I do, what are the chances that will work even if the built in ports are fried somehow?

by Gweilo on Aug 26, 2019 at 3:52am Add comment

Definitely a communications problem. Like you mention, it could be several things. A jetdirect card would work, since it uses a different route.

by moe on Aug 28, 2019 at 11:21pm Add comment

Thanks. Have ordered a JetDirect 620N.

Please check out the access problem with the site though: I can only reply now, cannot make any new posts. There is a very aggressive ad popup that may be related. Or maybe because I'm in Australia now?

by Gweilo on Aug 29, 2019 at 12:02am Add comment

I sold the site couple years ago, so I have no control over it. I have problems posting sometimes as well.

by moe on Aug 30, 2019 at 3:20pm Add comment

-- Still can't start a new thread. So continuing here:

Previous issue: parallel and USB ports were unresponsive. So I got a JetDirect 620N card; which works. When installing it I opened the side panel and found a huge amount of dust, looks like it hasn't been cleaned since the day it was made. So I wonder if the dust caused the comm ports to short out? I cleaned the parts I could see, but likely there is a lot more deeper in. I had already cleaned the rollers and all I could reach from inside, after taking out the cart.
How big a job is it to take apart enough to clean it thoroughly? Is an amateur likely to end up breaking it?

by Gweilo on Sep 3, 2019 at 9:25am Add comment

Thank you for writing! It is very easy to understand and detail. I find it interesting, I h


by minion89 on Sep 6, 2019 at 2:02am Add comment

Dust won't cause shorts. It's working, so don't worry about cleaning it.

by moe on Sep 6, 2019 at 11:22pm Add comment
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