1. Possible film on the laser from smoking or ultrasonic humidifier (air won't remove it)
2. Worn "puck" (possibly felt) holding CD down - check if CD does not wobble
As for bad board - the only thing that can slowly go bad are electrolytic caps (starting over 15-20 years).
There is stil possibility of things getting out of whack - most boards have test point and trimpot for laser readjustment.
2. Worn "puck" (possibly felt) holding CD down - check if CD does not wobble
As for bad board - the only thing that can slowly go bad are electrolytic caps (starting over 15-20 years).
There is stil possibility of things getting out of whack - most boards have test point and trimpot for laser readjustment.