Pioneer SX990 ?
Hi folks ! I'm new here ,and I have a question. I have a Pioneer SX990 that the right channel is distorting. Volume seems good it's just distorted. I found the OM/repair manual ,but there's really nothing in it about testing. I can see that someone has been in this before because they added RCA jacks to the A speakers. They also changed one of the 2SC 793 transistors on the power board to a TR 26.
Only thing I've done so far is poke around to see if I hit anything that changes the sound. Nothing yet. I also checked some voltages on these four transistors Q9 ,Q10 ,Q11, and Q12. Base ,and Emitter to ground. 11 ,and 12 showed very little to no voltage. Q9 showed 54volts on one leg ,and 46 on the other. Q10 voltage was fairly even on both legs at around 36-38.
The manual shows the board layout ,and some test points, but doesn't show what to look for exactly. Does anyone know where I can find the values of the test points ?
Thank you !