here is the PSU Schematic:
I Measured all the voltages at the transformer secondary and every value is spot on.
Replaced all the PSU Electrolytic caps with new Panasonic 105ยบ
Replaced BD901 and BD902 Bridge rectifiers
Replaced IC's U901 and U902, these are MC4558 opamps
Unsoldered Q901, Q902,Q903 and Q904 and verify them with my Atas DCA Pro, all the transistores measured good. Soldered them back on
Tested all the PSU diodes, all tested well
Problems:
After the BD901 regulator I'm measuring +-15v instead of +-18.
Collector of Q902 I'm measuring +1.7v instead of +12v.
Collector of Q903 I'm measuring -0.9v instead of -12v.
All the other circuit boards are disconnected from the PSU board.
Any idea of what might be causing this?
the only thing that I didnt had time to do today was measuring the resistors one by one because I have to lift one leg up, visually they look fine.
theres one strange thing with the DB901 bridgr rectifier. I measure it with the + and - legs in the air so it was not connected to the rest of the circuit. I have 16VAC coming from the transformer, after BD901 I'm measuring + and - 14VDC, thats really strange shouldn't the votage after rectification go up by an 1.414 ratio? I changed the Bridge Rectifier for a new one and the same happens.
thanks