This is exactly the service manual I needed.
Complete with all schematics, partslists, PCB layouts and alignment instructions.
This manual covers both the T-4970 en T-488F Onkyo tuner.
Text excerpt from page 92 (click to view)
3-2-2 Camera Adjustment
Note : "XX XX" indicate the previous preset value and adjusted value. Press the START/STOP (Confirm) button to store the adjusted value.
(Adjusted value)(Stored value)
1. LENS ZOOM TRACK
Caution : For whole zoom range, it shall be in focus. The location of a focus lens is moving depending on the location of zoom lens. During adjusting, micom measures the focus location from a near distance to a long. 1) Camera is set to E-E mode. 2) Focus chart photo (the last page of manual) 3) Ensure that camera is left an about 3 m distance from a focus chart and the focus of lens is placed vertically. Attach a focus chart to white or gray wall of a flat surface. 4) Connect a video output terminal to a TV. 5) Press the FF(Mode Up)/REW(Mode Down) button so that OSD shows "C8 XX XX". 6) Press the Display button so that OSD shows "C8 XX XX". 7) Press the START/STOP (Confirm) button. Never impact on the lens when adjusting zoom and focus lens. There's is a flicker on screen after finishing the adjustment.