Thanks you very much for this "hard to find" service manual.
Will help a lot in repairing this receiver.
Text excerpt from page 78 (click to view)
XC-IS21MD
7 Remove the Servo Mechanism Assy.
Caution for the time of installation of the servo mechanism assy
Move the MD Pick-up to the innermost circumference. The servo mechanism assembly is not installed other than the innermost circumference.
Servo Mechanism Assy
7
Removal of the MD Pick-up
1 Remove the MD Head. (One screw A) 2 Remove the Screw Guide at the lower side of the MD Pick-up. (One screw B) 3 Remove the S. H. Spring. (One screw C) 4 Remove the hook of the S. H. Spring as shown in the figure on the right. 5 Remove the Safety Screw. 6 Raise the left side of the Guide Shaft and pull it out to the left. 7 Remove the MD Pick-up. (With the front facing down, remove it to the front. At this time, the MD Pick-up can be removed more easily when the Reference Plate is removed.)
S. H. Spring
