Homebrew PCBs

Thanks Stefan for the schematic. Now I have a good idea over the circuit.

Today I search in my house and find the main board of the printer. I review 
the pcb and find the components asocciates to the fuser; BCR8PM a 8A, 600V 
triac. I think use the same triac for driver the fuser but with your circuit.

The service manual say over the internal thermistor: "TH901". I think it is 
a 10 K thermistor. it is ok for your circuit ?

Thanks,

Esteban Arias
earias@...


At 14:52 10/02/2004, you wrote:
>On Tue, 10 Feb 2004 17:32:42 -0300, Esteban Arias <earias@...> wrote:
>
>>Thanks Stefan. I am writing directly to you, no to the list.
>>
>>Then, when your say:
>>
>>"i made a simple thermostat with a relais and a potentiometer, nothing 
>>else needed"
>>
>>Do you are working with the temperature sensor inside of fuser ?
>>the original sensor?
>>
>>It is possible see a diagram of your circuit ?
>>
>>I am very interested in this project.
>>
>>Thanks,
>>
>
>it is very possible.
>you could write this on-list, it would not be off topic (as i know steve).
>especially when it is silent around he allows pretty far OT topics...
>
>
>i have drawn a quick schematic.
>attached.
>
>It is a shame that is is so simple (i went to a school for control 
>engineering).
>it could be much better, but it works so perfectly that i have no 
>intention to change it.
>because the Fuser is such a big mass it works as integrating element and 
>the simple on/off approach
>has such good results.
>
>with a mechanical relais you would need to add some hysteresis.
>if you have no solid state relais you can simply take a scr, triac, or a 
>FET, or whatever you like
>most.
>
>If you need help with the thermostat i will gladly help..
>
>ST
>
>