Amp turning on without remote voltage.

[catfishermike]

checked it,OL from 2-3.

 

[Perry Babin]

It's strange that removing this transistor broke the connection but the transistor isn't defective and the voltage feeding it isn't driving the transistor on.

Power the amp up including remote and measure the voltage on the pads of this transistor again.

 

[catfishermike]

12.63-.56-4.78 and climbing slowly.And from the pic you posted it would be.
3 2 1

 

[Perry Babin]

Did you list the other voltages in reverse order also. That makes a huge difference.

 

[catfishermike]

yes I did Perry.

 

[Perry Babin]

Check Q02 the same way.

 

[catfishermike]

voltage=3=11.5-2=0-1=0.69
ohms=ol any way i place the leads

 

[Perry Babin]

What's the voltage without remote voltage applied?

 

[catfishermike]

11.96 on 3-0 on 2 and 1

 

[Perry Babin]

If you have ~12.6v on the B+ terminals (as you did earlier), remove this transistor and check it out of the board. The resistance from 2-3 should read OL. Check it then reverse the probes and check it again.

 

[catfishermike]

OL with any lead placement

 

[Perry Babin]

Reinstall the larger transistor and power it up without remote voltage applied to see if it comes on. Leave the small transistor out.

 

[catfishermike]

No,it does not come on.3-2=0.10 1=11.79.b+=12.6

 

[Perry Babin]

Are you sure that 3=0.1v? It was 12.6 before.

 

[catfishermike]

yes,it is now showing .5 on 3,.10 on 2 and 11.79 on 1

 

[Perry Babin]

Measure the DC voltage across R01 and R06.

 

[catfishermike]

12.6 across both.Black lead on ground,red lead on both sides of both resistors.

 

[Perry Babin]

There must be a broken connection between the resistors and leg 3 of the transistor.

For future reference, when you measure the voltage across a resistor, you place one probe on each end of the resistor.

 

[catfishermike]

I did that first,didnt read any voltage.Then I did the other way.

 

[catfishermike]

Ok Perry I re-soldered,now i have 12.4 on 3,8.7 on 2 dropping pretty quickly,11.9 on 1.It came on,went off and now is cutting on and off slowly.Sorry Perry.