This manual is very useful because it presents the technical specifications of the cd player, including the manufacturer of the reader, this helps if you need to replace it. It also displays the settings and layout of the circuit.
Manual was a good representation of service infomation for the EWV404. It worked well for my repair.
Text excerpt from page 11 (click to view)
2-9. BASE UNIT
3 Base unit
1 Yoke bracket 2 Boss
2-10. DISC TABLE
Note: When the disc table is installed, adjust the positions of roller cam and mark z as shown in the figure, then set to the groove of disc table.