asked Jan 24, 2008 at 4:21pm
Hp HP Color Copier 150

HP LJ 4000 50.2 Message

Sorry to post. I read through so much and gave up.

Anyway, my LJ 4000 shows 50.2 error message. Tested the heating element on the fuser and it came in at 14.4 ohms for the big tabs and 450K for the little ones. so that's not it.

So...does that mean my engine controller board is cashed? If so, does that mean I should save this printer for parts and buy a used one from ebay for $150? Or is it worth it to pay $30 for the new board and try to install it?

I've gotten so so many prints from this machine. It was running just fine before this happened. We have such happy memories together....sniff!

Thanks for any help!
Most times a 50.2 error is the fuser no matter what you read. Best thing is if you can borrow a fuser from someone with the same printer just to test to see if it works in your machine or you could take your fuser to someone with the same printer and see if you get the same error on their printer. If not the fuser the main board is the only other item. To be honest in the 100's of 4000 series I have repaired over the years I have never had a 50.X error caused by the main board and it has always been the fuser.
by dmzcompute on Jan 24, 2008 at 6:32pm Add comment
thanks for the response. i got a new (used) fuser and it also tests fine and gives me the same message. perhaps it is also bad. hmmm.
by pronoid on Jan 24, 2008 at 6:41pm Add comment
Same here, never replaced anything but the fusers. I wouldn't trust the readings. Never know what happens under load and heat. If you want to just replace the heating part, we stock them. Cheaper than buying a new fuser and it's OEM, not a rebuilt fuser with a new plastic sleeve. That and the pressure roller is all that's normally replaced on a rebuild. Click on my name to email me for pricing and ordering info.
by moe on Jan 24, 2008 at 6:41pm Add comment
2 fusers giving the same message is strange. One other thing to check is the interconnect on the printer side to make sure no pins are bent or debris in the connector.
by dmzcompute on Jan 24, 2008 at 7:18pm Add comment
I'm wondering if you have another printer (the one you got the fuser out of?) you can try the both of them in.
by moe on Jan 24, 2008 at 10:21pm Add comment
no, i don't have another printer. bought the 2nd fuser off ebay.
by pronoid on Jan 25, 2008 at 1:38am Add comment
Engine controller board pn= RG5-3639.
by Anonymous on Feb 4, 2008 at 11:15am Add comment
is there any way to test my board?
by pronoid on Feb 4, 2008 at 12:02pm Add comment
If it's not the fuser, it is most likely the engine controller, I don't know of anyway to test the board other than replacing it and seeing if the error goes away. It's not a very fun repair as there are lots of assemblies that need removing before you can get to it.
by AngryatQuality on Feb 4, 2008 at 1:17pm Add comment