sx 1250 tune problem

[mike z]

Hi All

I brought a sx1250 pioneer receiver. Amp is great but the tuner won't center on stations w/o multipath at the stations max rf. Anyone have an idea what's causing it. (ts not the antenna.)

 

[TLS Guy]

Hi All

I brought a sx1250 pioneer receiver. Amp is great but the tuner won't center on stations w/o multipath at the stations max rf. Anyone have an idea what's causing it. (ts not the antenna.)

You can download a circuit here. The tuner sections starts on page 11. it is a complex circuit of tuned oscillators and cascading MOSFETS. This will require an expert to sort out with sophisticated equipment. I suspect there is either a cap critical cap in one of those circuits or one of this critical inductors has wandered out of spec. You will not fix this.