Emphaser 1800d PS driverboard

I have a defective Emphaser 1800d. Board looks like a Hifonics BX1800d. The power supply MOSFETS were blown, replaced 12x IRFP064N.

Also the drivertransistors on the ps driverboard were blown. From a picture I can read BE as both driver transistors Q7 and Q8 marked. Right upper corner.

The type could be BCX55 but they are NPN and on the driverboard the collectors are connected on massa, not +12V.
I measure the other BE (Q2) on the driverboard as a PNP type....

Question is, what transistor I can use as BE , because BCX55 isn't working.:confused:


  • dscf0012_160.jpg
    219.7 KB · Views: 94