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Pioneer SX-1000TD

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scorpio333:
Found this other day and it followed me home. Was a horrendous sounding mess when I first powered it on. Deoxit'd everything and dusted it out. All knobs are smooth with no noise. FM sounds very good, I just never listen to FM. All the lights work. It plays loud and doesn't break up at all.

When I switch to Phono, Tape or Aux there is an audible hiss like FM static. Turning the volume knob slowly with no source playing, right about 11 o'clock there's a dip in volume then it kicks right back to where it should be. Any ideas what could be causing this hiss?

There's also a bit of a blip or thump when powering on.

Dicky:
Grab a schematic from hi fi engine.  I glanced for a second, looks like a little more cleaning should do something since they (Tuner and aux) all end up on a selector switch with nothing in between, but again i looked real quick.  If i have time later Ill try to evaluate more.

scorpio333:
Just poking around it sounds like a pre-amp issue since the volume knob will increase/decrease the static. I'm a noob in this area, so I could have that all wrong, but want to learn this.

Here's the diagram for the pre-amp

Sir Thrift-a-Lot:

--- Quote from: scorpio333 on November 07, 2014, 01:37:48 PM ---Turning the volume knob slowly with no source playing, right about 11 o'clock there's a dip in volume then it kicks right back to where it should be.

--- End quote ---

I would DeOxit that pot again.   I've had ones where two or three cleanings were needed to get it to 100%.

Anders:
Yes but any dc on the pot will cause it to act up.

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