On Mon, 22 Feb 2010 11:23:37 -0700, wrote:

I'm trying to repair this multifunction color laser printer / copier /
fax / scanner. The person who gave it to me indicated it needed a new
OPC belt. Sure enough, when powered up it gives a message "No OPC
Belt. Install OPC Belt" Unusual, the normal message is "Replace OPC
belt". Once I found out how to replace the OPC belt, I discovered the
belt was already present.

Try reseting the OPC counter:
http://solutions.brother.com/Library/pdf/sl4cfb/sl4cfb_op_en.pdf
The procedure is at the end.

However, I don't think it will fix the problem. Some sensor (optical
or microswitch) is not working when you insert the OPC belt cart. That
sometimes happens when the wrong cart is crammed into the printer.
Brother makes several that are similar. Verify the number. My
guess(tm) is that there's a microswitch somewhere inside that
activates when the OPC belt cart is inserted, and the connector at the
end of its cable is unplugged from the last person that was inside the
printer. Reading between the lines of your posting, it seems there
was some previous work done.

--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558