Marantz CD player repair of No disc error

Marantz CD players with the Digital Servo Driver sometimes can't read CD's after some time of use. Often then it is thought that the laser output is too low but this is not always the case. Check for focus error gain like instructed in the video. For the CD67 I placed a 47k resistor across R112 to increase focus gain. Might also work for other players with the CDM12.1 or VAM1202 transport. Good luck.