This manual was very clear and complete, the prices can't be beat, great to have older manuals available!
Text excerpt from page 7 (click to view)
6. Error code
DISPLAY MECHA ERROR 01 MECHA ERROR 02 MECHA ERROR 03 MECHA ERROR 04 MECHA ERROR 05 MECHA ERROR 08 ERROR CONTENTS No input of S3. The original position error of Disc Number. No input of S2. The turning direction error to counterclockwise No input of S1. The turning direction error to clockwise No input of main load sw. No input of main unload sw. No backed up(AC power cord has disconnected). S1-3:Mechanism address detector switch. There are load and unload switches in the main pickup.