Sony Yeds18: Test Disc Exclusive

Because Sony never authorized mass replication of this disc for the public. It was strictly a “Service Center Only” item. If you saw a YEDS18 in the wild in 1992, you were either a Sony-certified technician or you knew one.

Disclaimer: This document is a technical draft for educational purposes. Always consult the specific Service Manual for your audio equipment before performing internal adjustments, as incorrect settings can permanently damage the laser pickup. sony yeds18 test disc exclusive

: Used to evaluate linearity, signal-to-noise ratio, and channel balance. Because Sony never authorized mass replication of this