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Deffected MLVA element

Minilab service

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Hello. Next week I will go to repair minilab QSS2901 , which has deffected some element ( or elements ? ) inside MLVA head connected to MLVA temperature control PCB. Maybe someone know what element it is ? Maybe it is some additional sensor ? It is connected to connector CN5 and it has four wires. This element is defected and I would like to know what it is. I want replace them.  It is not thermosensor ( thermosensor - connector CN3 and it has 2 wires : it is marked CN2 in service manual ) and it is not MLVA heater ( heater - connector CN4 and it has two wires ) .

If someone know what kind of element is connected to CN5 ( with 4 wires ) please give this information.

Thank's in advance.

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