As I told you, it seems to be something wrong at the power supply area.
Following the service manual try to trace the problem: Check Voltages at Q2 and Q3 terminals, measure resistance values for R2, R3, R4 and R5. I'm supposing that Q1 is OK, the value you measured for J2 at Q1 is too high!, I know that you haven't a capacimeter so if the turntable is 15 years old or over then change all electrolytic caps.
A scope will be necesary to test the ICs.
Does this link describes your problem (in this deck fails one AN6675)?http://www.youtube.com/watch?v=DvI_OJ2xa9g