Thanks you very much for this "hard to find" service manual.
Will help a lot in repairing this receiver.
Text excerpt from page 17 (click to view)
DISC LOCK ARM SL
1 Apply sellotape to the disc lock SL ass�y as shown in figure to prevent the disc lock from falling off while removing the disc arm SL.
2 washer 3 disc lock arm SL
sellotape (Fig. F. 1)
disc lock SL ass�y
D lock spring SL
INSTALLING THE DISC LOCK ARM SL
POSITIONING OF THE DISC LOCK ARM SL IS REQUIRED. (Refer to Fig. F. 2)
(1) Place the disc lock spring SL as shown in the figure. (2) Insert the disc lock pinion into the hole on the disc lock arm SL. (3) Adjust the position of the disc lock arm SL until its mark meets the V-cut of the disc lock pinion as shown in the figure.
(4) Insert the shaft hole of the disc lock arm SL into the shaft. (5) Hook the end of the disc lock spring SL on the chassis hole as shown in the figure. (6) Reassemble the washer in place. (7) Peel off the sellotape. Refer to Fig. F. 1.
