Great service manual. Unfortunately on page no. 41 there are some details which i can't read.
Text excerpt from page 55 (click to view)
14. 38 Sub cam / 39 Arm gear 2 assembly / 40 Clutch lock lever assembly <Note 14a>: How to attach the sub cam 38 .
Phase alignment Phase alignment
Phase alignment Align the phases of the arm gear 2 assembly 39 and clutch lock lever assembly 40 , then attach them by fitting the boss into the lower cam slot and tighten the screws.
Fig. 2-8-14A <Note 14b>: How to remove the clutch lock lever assembly 40 L19 is located behind the mechanism assembly when the phase is aligned correctly. The clutch lock lever assembly can be removed by displacing it in the direction of the arrow.
Fig. 2-8-14 15. 41 Capstan motor / 42 Drum base deck