G05 question...

 Trying to troubleshoot my G05 for the Battlezone...

 I found both of the power transistors that are on the output of
 the Y amplifier circuit are dead shorted C to E. This caused the two
fuses on the input to the 60 VAC input diode bridge (D100 I think it was
numbered) to blow. The bridge looked ok, and the caps after the bridge
looked ok.

 Now, the question: obviously, the short through those 2 power
transistors caused the bridge to draw too much current and the fuses to
blow. Why did the transistors blow? If one of the two blew, I'd say bd
transistor. Would one failing cause the other to fail because of the
circuit configuration? OR, is the circuit that drives the bases of those
transistors somehow messed up so it opened both of them at the same time,
they drew too much current through the almost dead short, and whammo --
both gone...??
 
 I figured you guys have replaced enough of these power transistors to see
certain behaviors...

                                Mitch
Received on Tue Feb 17 07:38:09 1998