canon ir5870ci tripping circuit breaker.

[srv]

Hi folks.I have a canon ir5870ci that is tripping the circuit breaker on the m/c.The m/c could work fine all day and then trip the breaker.I haven't seen it happen cos it is so intermittent but appears to be happening with both printing and copying.I have checked the fuser but it seems fine.I have checked the errors in service mode but nothing is recorded.Any ideas would be welcome.

[SCREWTAPE]

Ok you checked the fuser section...
Somethings is overloading your AC current.
Did you look at the thermoswitch?

[srv]

I stripped the fuser and checked all the relative parts but everything looks to be fine.What is throwing me is that the m/c can work fine for a day or two and then trip out.

[SCREWTAPE]

I stripped the fuser and checked all the relative parts but everything looks to be fine.What is throwing me is that the m/c can work fine for a day or two and then trip out.

Replace you thermoswitch for now. There are two of them I believe. One on the fixing roller and one and the heater roller.
They should be making contact completely to the shafts of those rollers. Also, this machine is a 20 amp unit it should be on a NEMA 5-20 receptacle.
What's the count on the unit.

[MrB]

only thing i can add onto Screwtape suggestions is make sure that the device is NOT plugged into an extention lead
Thats something I come across a few times a week

[mrfixit51]

What I am reading from this posting, is that the internal circuit breaker on the copier is the one that is being tripped, not the customers breaker panel.

So yes, either the copier is pulling too heavy a load on the internal breaker,(which I believe is probably 15 amps), or the breaker itself is a problem.

[SCREWTAPE]

The drum heater also could trip the circuit.

[srv]

Sorry for taking so long to respond guys.I swapped the fuser with another m/c that is in the same room when I was at the call (3 days ago)and both m/cs are working fine.I think I will order thermoswitch's ,thermistors and maybe lamps for fuser anyway.Thanks for responding so quickly.

[mrfixit51]

Glad that you seem to have it resolved....

[Canuck]

Sounds like a short...thermoswitches are either bad or good....even if they did get flakey would be high resistance=less current. I have seen where they are deformed or set too far from the roll and the spring contact assembly that holds them shorts on the fuser frame underneath...check the fuser and heating rolls for wear..i have seen their surface coating wear thru and the thermistor shorts against the bare aluminum(especially heat adding roll).Any errors logged?

[djbass]

In my own experience simular faults have always thrown an E000-E004 error before it ever got to the point of tripping the breaker.

I had one machine that would intermittantly report an E000, which I isolated to a dropped screw (someone elses, not mine ) that had become lodged between the active pin on the power socket and the machine chasis. All the more reason I always stress you should never let a wayward screw go unfound no matter how much of a pain it is to retrieve.