Upon this machine tray of transmission mechanism, feel at ease, no slippage belt, apparently mechanical part there is no fault. Release IC2051 (3), (4) feet in 4.5 V dc voltage on both ends of the loading motor, with good/into the tray, can eliminate load motor has a problem. DA7service manual download site
 DA7service manual download site
To drive disc tray warehousing, monitoring IN the image below - SW testing switch is closed, IN IC6031 @ feet for low level, laser still don't return to disc center import area zero rail; Manual feed drive mechanism, the laser shift back to the center position, monitoring IC2001 (32) feet of laser limit switch ST - SW closed; Strabismus no red light, laser lens, it doesn't happen lens focused search up and down movement. Two artificial collaboration can make movement into next working procedure, to judge the problem in the central control system. After replacement, troubleshooting.DA7service manual download site