The service manual is really great - thanks to it I was able to install the laser unit and thus "save" my CD-player, which seemed to be impossible before I had the manual.
Complete manual as pdf-file in very good quality. Very helpful and fast availability.
Text excerpt from page 27 (click to view)
5-2. Replacing the CPU
1. Removing the CPU
1 Insert a flat-blade screwdriver into the notch as shown in the illustration rotate it so that the protrusion comes to the lock release position. 2 Pull the CPU gently upward to lift it out of the CPU socket. and
2. Installing the CPU
1 Align the triangle reference mark of the CPU with that of the CPU socket and insert all the pins of the CPU to the corresponding holes of the CPU socket. 2 While pressing the two positions marked by a, insert the flat head (-) screwdriver into the specified position and rotate the screwdriver to the LOCK position.
1
2
1 CPU Lock position 2
2 CPU Lock release position Reference marks 1
Lock release position
CPU socket
Lock position
CPU socket
NOTE: Rotate a flat-blade screwdriver to the lock position securely. If not, the operation of the CPU may become unstable.
