[Error Code] SC400 on MPc2050

[Rich]

Anyone got any ideas about this? Have cleaned the ID sensors/brackets etc. and also the PTR HP sensor, lubed it etc. Running the m/c with no cleaning unit I can see the Process Control patches on the belt. Tried new ID sensors also. Any ideas?

[Jomama46]

ID sensors use the ITB for patches, if the belt is scratched or the rollers beneath it are dirty, that would be the problem

[Rich]

They all seem ok. The machines not done more than 50k total. Will check again but not sure it causing the problem. Cheers anyway.

[rsyarcia]

Noise occurs followed by SC 400 Question [Symptom]
Shortly after switching on there is an audible buzzing noise, followed by SC 400 [ID sensor adjustment error].
Answer [Cause]
Paper Transfer Roller (PTR) motor locking during initial process control checks.

[Action]
Remove the Paper Transfer Roller (PTR) motor unit. This is located under the right hand inner cover just below the interlock switch). Refer to the Service Manual for the correct procedure. Clean the positioning sensor and lightly greased cam, ensure that there is free movement of the paper release guide. Install the unit again and check for correct operation.
[Note]:
Please make sure the return spring [A] is removed before removing the unit and re-fitted after assembling.

[Rich]

Yeah. I read the bulletins too!

[tonnerboy]

Sory the question...
Did you clean the ITB? Check the picture...
The ID bar is just below this Guide bracket (A) and has a tendency to Accumulated tonner. Then falls down to the ID bar.

[Rich]

Eureka! Found the cause. On the rear of the ITB unit, remove the motor and there's a black cover held on with 2 self tapping screws. Behind the cover is a photo-interruptor with an encoder disc. The sensor/encoder disc had become contaminated with dust/toner and by cleaning with alcohol and a soft brush the machine fired into life straight away. Did 20 Full Music forced process controls and go all 1's every time. I assume the sensor couldn't read the output from the disc so the actual rotation of the belt was not being seen as constant, even though it was ok. This could cause the readings from the Process Control patches to be seen by the machine as being incorrect ie the sensors are expecting to see full density but actually seeing half therefore throwing the SC400. Either way it is now working and we have one happy punter . Happy Days! Cheers to everyone for their input. Be Lucky.