This is a good quality scan of the service manual which includes an assembly diagram, block diagram, schematic, and parts list. Exactly what is needed to repair my KR-V55R receiver.
Text excerpt from page 45 (click to view)
CR14
� Assembly of Change arm
Step 24: Insert service jig into the traverse hole, rotate the gear clockwise. Step 22: Slot the traverse unit assy onto the UD base as arrow shown. Note: Ensure the bosses fix exactly onto the guides. Note: Ensure the groove of the TRV slide plate assy stop at the position shown.
Step 23: Push the guide to lock the traverse unit assy in.
Step 25: Install the change arm to the groove of the TRV slide plate assy. Step 26: Push the TRV slide plate assy as arrow shown to lock the change arm.