On 23/02/2016 11:19 AM, Jeff Liebermann wrote:
On Tue, 23 Feb 2016 09:13:00 +1100, Trevor Wilson
wrote:
**Good news bad news time. I now have the service manual for this
device. No useful schematics. Just block diagrams and hundreds of pages
of mechanical drawings and photos. Quite comprehensive in it's own way.
The good news is that I now have a proper interpretation of the fault code.
50.8 = Low fuser temperature (Subthermistor)
Thank you for delivering the error message.
**It is the same as the one I supplied in my original post.
http://www.all-laser.com/a50service/
I've seen that error message on other model HP printers. In my
experience, it can be anything from a loose connection on the ends of
the ceramic slab heater element, to cracks in the heater element.
Also, caked on toner onto the thermistor temp sensor will cause a low
temp reading. Measure the resistance of the heater element from end
to end and you should see about 15 for 117V and twice that for 220V. I
think I know where I can find a 3800 to measure, or just ask in the HP
forums or FixYourOwnPrinter forums.
**As soon as I figure out how to dismantle the fuser, I will check those
things.
This article suggests that it might be low line voltage:
http://www.fortwayneprinterrepair.com/wordpress/2011/11/06/hp-color-laserjet-3000-3600-3800-and-cp3505-50-1-fuser-error/
**Unlikely in my case.
Also see:
http://www.fixyourownprinter.com/posts/42184
I'll try to find the unspecified service note, but so far, I'm not
having any luck finding it.
Meanwhile, dig through this mess on 50.1 errors and see what you can
excavate:
https://www.google.com/search?q=hp+color+laserjet+50.1+fuser+error
Would I be crazy to buy one of these?
http://www.ebay.com/itm/RM1-2764-RM1...AOSwnDxUgFp 3
Good find. I missed that one. Yes, that should work for 220V. I
checked the numbers. Since the rebuild kit does NOT include a heater
element, the replacment from China may be your only reasonable option.
**That was my thinking. I figure that I should probably replace the
heater, if I am overhauling the fuser. Anyway, thanks for all your
assistance. I'll keep you posted.
--
Trevor Wilson
www.rageaudio.com.au
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