mpc2800 sc543 overheat

**andy227** · 08-06-2016

On the mpc2800 we are getting sc543, we are changing belt, thermistors, bushes, PSU, but it still comes back after a few days, weeks if we are lucky, with the fuseing belt and bushes all buggered up again. When I monitor the fusing belt center temperature, I can see it at normal circa 165° then it starts rising and running away 170-180-190-200-210° ! It peaks there, then starts going down again. What is going on here ? Engine firmware we have is version D0255117N 1.59.09. The thing is, all the 2800's, and only the 2800's, seem to be going down this road lately, one by one we are pulling them as there seems to be no solution. Any ideas guys, anyone else come across this ?

**Jude** · 08-07-2016

Originally Posted by andy227

On the mpc2800 we are getting sc543, we are changing belt, thermistors, bushes, PSU, but it still comes back after a few days, weeks if we are lucky, with the fuseing belt and bushes all buggered up again. When I monitor the fusing belt center temperature, I can see it at normal circa 165° then it starts rising and running away 170-180-190-200-210° ! It peaks there, then starts going down again. What is going on here ? Engine firmware we have is version D0255117N 1.59.09. The thing is, all the 2800's, and only the 2800's, seem to be going down this road lately, one by one we are pulling them as there seems to be no solution. Any ideas guys, anyone else come across this ?

We are having similar trouble with a MPC 3300. The moachine is at construction site with no dedicated power. The problem stars with fuser then we open door and boot but cannot acccess the SP modes. The machine will cycle power but will not consistanly boot. Test power grounding etc.

**andy227** · 08-07-2016

Yes , 3300 is same machine,

The problem stars with fuser then we open door and boot but cannot acccess the SP modes.

, not sure I understand, you mean you get the sc543 etc ?

**Jude** · 08-07-2016

Yes we are getting the SC543, 542 codes. I am not saying yours is the same p[roblem as mine but when I see weird trouble codes that wont reset after parts replaced then I am suspect board problems or dirty power problems. Do you have a power tester?

**ReyTech** · 08-07-2016

Originally Posted by andy227

On the mpc2800 we are getting sc543, we are changing belt, thermistors, bushes, PSU, but it still comes back after a few days, weeks if we are lucky, with the fuseing belt and bushes all buggered up again. When I monitor the fusing belt center temperature, I can see it at normal circa 165° then it starts rising and running away 170-180-190-200-210° ! It peaks there, then starts going down again. What is going on here ? Engine firmware we have is version D0255117N 1.59.09. The thing is, all the 2800's, and only the 2800's, seem to be going down this road lately, one by one we are pulling them as there seems to be no solution. Any ideas guys, anyone else come across this ?

You need to check the power pack.

**kannuki2** · 08-07-2016

I'd recommend replace a new fusing unit. I've seen other technician rebuild them and ended up replacing a new unit.

**gkalman2004** · 08-07-2016

Maybe will help.
If already ball bearing's, bushing's, belt etc..is changed
Usualy is thermistors fault but if the error return also change the harness D0254303
(HARNESS:FUSINGUNIT:NA)

**Zeldaman** · 08-08-2016

High there!
Kannuki2 is right.If the sc´s re-occur after rebuilding the fuser, it´s the best to change the whole unit. Beginning changing wires, etc only leads to a never ending story.
Greetings...

**andy227** · 08-09-2016

thanks for all replies, however,

You need to check the power pack.

That got swapped out, same thing

I'd recommend replace a new fusing unit. I've seen other technician rebuild them and ended up replacing a new unit.

Not very practical, how much did that cost his boss ? Cost of a new fuser is not practical when you are dealing with used copiers, and my boss would go bankrupt if he bought new fusing unit for every sc543.

only leads to a never ending story.

absolutely true. There has to be more to this with the 2800/3300. Wiring harness, can't see it afflicting all 2800's.

**TonerMunkeh** · 08-09-2016

Unfortunately, as mentioned in countless threads about SC's 543 and 553 on the Athena and Diana series of machines, the only permanent fix is to replace the complete fuser. It doesn't matter how much it costs if it fixes the machine. Why pull a perfectly good machine when it requires just one part to fix it? Look after the pennies and the pounds (or whatever currency you use) look after themselves. Even fixing used copiers requires outlay.