MPC 4500

[knobby]

Anyone seeing sc 548 and 549 frequently on mpc 4500s

seem to be getting a lot only on a few machines ...

Cheers


Gaz

[Cipher]

Yup.

Check sensors [G] and [H] are seated correctly on their brackets.
When the fusing unit gets pushed back into place they can be knocked out of position.



See MTB12a (MB222012a_sn) wider sensors.

Also if the pressure roller has a flat spot it can effect the consistency of the rotation leading to the odd occurance of SC548.
(Updating the firmware should help with that one, as SC548 detection/timing has been changed).

[knobby]

Cheers Cypher

done all that

still intermittent, will check firmware next visit

[Lagonda]

Also check to see if the ferite roller is starting to break up. The plastic bushings at each end tend to spin in the outer casing.

[CableGuy]

I agree, if it's not the sensors, have a look at the ferrite roller. I've had one that locked up, would only turn one way. after a bit o persuasion it broke free. Have you done a PM on this machine? If so did you replace the ferrite roller?
Good luck

[abenford]

There is a bulletin about sc548 and sc549.
sc 549 change the fuser location sensors
sc548 update the firmware

[apache_cat]

Definately do the firmware. Had the same problem recently service tech had tried everything asked me to update firmware and hey presto no more problem.

[msaeger]

Yeah how many copies on the fuser ? I have been to several of these that are way over and no one rebuilds the fuser because the belt still looks ok. If the sensors are still in place I would rebuild the fuser.

[SGT_Snacks-64]

Has the Ferrite Core Roller ever been changed? There's a newer one out now with the White bushings. If the bushings are black it's the older model. Might just be worth changing all the rollers in the fuser. It takes a little while to do but after a couple it comes naturally The Orange sponge roller also disintegrates after life.

Just throwing some suggestions out there....

[tcs04]

	Quote:			Originally Posted by Lagonda
	Also check to see if the ferite roller is starting to break up. The plastic bushings at each end tend to spin in the outer casing.

I've had a roller get tight, in this case it seems the motor is not strong enough to move the roller to / from home position which gives random codes. I compared the roller to one in a rebuilt fuser and there was a noticeable difference. Changing the roller solved the problem (The machine already had all mods and firmware updated)