The Sony AV-3600 service manual was what I needed for the repair of this unit
Thanks for the good service
Dave
Text excerpt from page 25 (click to view)
4. Remove the 3 cam caps.
8.4.2.
Removal of the Direct Frame Unit
1. Turn the drive frame unit to the indicated by arrow. (Retracting direction)
5. Pull down the plate part of master flange unit (refer to arrow(1) ), and then turn the master flange unit to counterclockwise fully (refer to arrow(2) ). 6. Remove the direct frame/drive frame/1st lens frame/2nd lens frame unit to the indicated by arrow.
2. Remove the direct frame/1st lens frame/2nd lens frame unit from drive frame to the indicated by arrow.
3. Push the 1st lens frame/2nd lens frame unit from lens front side, and then remove the 1st lens frame/2nd lens frame unit from direct frame.
