I cleaned the PC boards and removed any corrosion looking stuff on the jumpers. Whatever that glue is made of, when I peeled it off of the plated jumpers, copper shined out from under it
So the glue eats through the plating and polishes the copper?
Anywho, I powered-up the player and the display came to life. It doesn't look very bright but it reads well:
I next went to reading the voltages and measuring the ripple on the power supply board .
The -24v rail measured -24.6v with 10.92mV of ripple.
The -12v rail measured -12.2v with 212uV of ripple.
The +12v rail measured 11.9v with 200uV of ripple.
The -7v rail measured -7v with 540uV of ripple.
The +7v rail measured 7.4v with 512uV of ripple.
The +5v rail measured 5v with 224uV of ripple.
The -17v rail measured -18.3v with 300uV of ripple.
The +11v rail measured 12.9v with 96mV of ripple. Yes, 96 millivolts of ripple:
But if you look close at the power supply schematic the +11v rail has no smoothing as it comes directly off of the bridge rectifier.
As for the laser pickup, the part number is stamped on it:
More to come...