Got a Stetsom HL800.4 amplifier that I repaired 1 channel on. The amp was in protection when I received it and during the process of the repair, the smd transistor was misplaced. I am unable to find out what it is by searching the markings on it. I think it says R8PXE(R0PXE?) on it and is a 3 leg component, same package as an MMBTA56 and the like. If using the configuration of the MMBTA56 in normal operation there is 5.6v on base(leg1) and emitter(leg2) and 0v on the collector(leg3). Any output voltage on leg3 would trigger the protection. Not sure whether a transistor, diode or switch can be used in this location but I would like to ask before inserting a wrong choice. In this amplifier, this component has leg1 connected to leg1 of IRS2092S and leg2 connected to leg5 of IRS2092S. It is Q24 in the attached pics.
Attachments
Last edited:
With the component out of the board, it tested like a transistor except with the base and emitter legs switched. I have ended up installing an MMBTA4403 upside down in it's place based upon the readings I got. Everything is working without going into protection but I am unsure whether the protection will function as intended if a problem arises. Hoping someone can advise me as to what component actually belongs there.
