MPC2800 SC542 Error

[Masterx81]

Hi, i have an MP C2800 that give me the SC542 error. I've reset it but it came back every time.
I've checked the thermistors and are ok (3 sensors at around 200kohm at ambient temp, lowering when heated - ntc). I've checked resistance of the lamps and is correct for both the double one and for the single one. I've checked on the psu unit connector cn902 (the one that goes to the fuser unit) and at power-on i see 220v only on 2 lamps out of 3 (the single one is not turned on). The triac is good, is the logic board that not turn on the lamp.
It's normal that only 2 lamps (of one roller) are heated at power on?

Tomorrow i measure the current absorbed by both lamps to check if both are healty, and maybe temperture of the fusing unit...

Someone have some idea? Thanks!

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[slimslob]

Re: MPC2800 SC542 Error

I noticed that you did not mention the thermostats/thermo fuses. They cause most recurring problems because the SC table does not mention them therefore most inexperienced techs don't think of them. You can check them with an ohm/continuity meter. If on reads open you can bypass it while you wait for a new one.

[Masterx81]

Re: MPC2800 SC542 Error

I noticed that you did not mention the thermostats/thermo fuses. They cause most recurring problems because the SC table does not mention them therefore most inexperienced techs don't think of them. You can check them with an ohm/continuity meter. If on reads open you can bypass it while you wait for a new one.

Forgot to say, already checked them (3 in the fuser unit) and are all at 0 ohms when cold. They are in series at the lamps.
Tomorrow measuring the absorbed current i can see if one of them open too early. Thanks for the suggestion!

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[GIUBOSS]

Re: MPC2800 SC542 Error

hi, if the belt is deformed or shows signs of damage, it may not constantly and uniformly contact the thermistors. Thermostats usually do not give problems if they give continuity. I would do a firmware update and in any case the 3 thermistors if old replace them. A look also at the electric line.

[Masterx81]

Re: MPC2800 SC542 Error

hi, if the belt is deformed or shows signs of damage, it may not constantly and uniformly contact the thermistors. Thermostats usually do not give problems if they give continuity. I would do a firmware update and in any case the 3 thermistors if old replace them. A look also at the electric line.

[mikadonovan]

Re: MPC2800 SC542 Error

The machine can give you the actual temps in SP mode, no need take manual temperature readings. You probably need new thermistors.

[MIGUELMARCHENA]

Re: MPC2800 SC542 Error

Hi good dayAs you have already indicated, I would change the thermistor

[Masterx81]

Re: MPC2800 SC542 Error

Wow, missed the menu 1-106! The reading from the 1-106-1 (fusing:center) is erratic and not stable, jump a lot (but the resistance measurement of the thermistors was rock solid). The other 2 readings are stable. What sensor refer that reading?
---EDIT---
Found something that seem an ir temperature sensor (mounted under the paper out mechanism) pointing on the center of fuser belt... I suppose that it's the faulty one?
It's called a "thermopile" on service manuals...
---EDIT2---
Disconnecting the sensor from the wiring stop the reading to -20 fixed, so i think that i need to order this sensor. Tried to clean the lens without effect, so it's gone...

[slimslob]

Re: MPC2800 SC542 Error

Wow, missed the menu 1-106! The reading from the 1-106-1 (fusing:center) is erratic and not stable, jump a lot (but the resistance measurement of the thermistors was rock solid). The other 2 readings are stable. What sensor refer that reading?
---EDIT---
Found something that seem an ir temperature sensor (mounted under the paper out mechanism) pointing on the center of fuser belt... I suppose that it's the faulty one?
It's called a "thermopile" on service manuals...
---EDIT2---
Disconnecting the sensor from the wiring stop the reading to -20 fixed, so i think that i need to order this sensor. Tried to clean the lens without effect, so it's gone...

That is the main temperature sensor. All thermistors are secondary.

[Masterx81]

Re: MPC2800 SC542 Error

That is the main temperature sensor. All thermistors are secondary.

I'll try to replace it and see of it's fixed. The readings were absolutely random...

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[GIUBOSS]

[Masterx81]

Re: MPC2800 SC542 Error

Sensor ordered.... When it arrives i hope that all is ok.
I've ordered the whole ricoh part (AW10-0106), but the sensing element seem this one:
A2TPMI334-L5.5 Thermopile with integrated signal processing circuit. | eBay

I would like also to update the firmwares of the device, where is possible to find the updates?

[vargue]

Re: MPC2800 SC542 Error

first .you should't go to psu directley. examine fuser unite first . may be thermistor may be thermostat. may be fuser belt.

[Masterx81]

Re: MPC2800 SC542 Error

first .you should't go to psu directley. examine fuser unite first . may be thermistor may be thermostat. may be fuser belt.

I've checked the psu because i was unsure if it was normal that the lamp of the pressure roller was kept powered off on warm up... and as it had that error that the fuser was not able to reach temperature i tought that was a fault on one lamp/drive. Only after some time (thanks to mikadonovan that pointed me that was able to read the temp in sp mode) i've noticed the menu about the temp readings and found the faulty ir thermopile sensor.
It's the first time that i work on a similar machine so i was unsure about what to do

[fshead]

Re: MPC2800 SC542 Error

i am lucky as i save spare full units as long as there are accounts still with that model.
The unit doesnt have to be perfect but a working pull.
That saves me having to guess what is wrong with fuser codes.