[Yaesu] FT-757GX

[Jose B.da Silva]

Hello!

A friend of mine has a FT-757GX with a problem.
It is in the RX/TX electronic switch.
There were some faulty devices in the RF Unit, but they were all replaced.
The problem now is that the collector voltage in Q56 (RF Unit) is around 5 V
when in RX. It must be -0.8 V. In TX it goes to 7.1 V, which seems to be
normal.
Because of the 5 V in the collector, the small signals TX circuits are
allways on, even in RX. It is not correct. The emitter and base voltages are
OK.
Does anyone could point me anything about this?
The problem is not with Q56. It is OK.

Thanks in advance.

Joe, PY5CEK