Excellent quality on these manuals. Same as having the original printed manual and incredibly useful when doing a custom install like me. Keep it up on the good work.
5 stars on this manual since it is the complete version, not the half manual you find free for download all over the web. Good job.
Text excerpt from page 39 (click to view)
Digital Main 4/8 Schematic Diagram
1 NOTE: The order of pins shown in this diagram is different from that of actual IC1504. IC1504 is divided into four and shown as IC1504 (1/4) ~ IC1504 (4/4) in this Digital Main Schematic Diagram Section.