Panasonic PV-4601 A Service Manual page 74

Oscilloscope
* Specification : ...........................................0.13 ± 0.02mm
1. Remove the VCR Chassis Unit and then place it upside down.
2. Remove the Main C.B.A.
3. Slightly loosen 2 Black Screws (A) and set the Screwdriver (#1 or #2 Phillips
Driver) into the Hole (B) shown in Fig. M18. Turn the screwdriver counterclockwise
until the FG Head touches the rotor. Then turn it slightly clockwise to the
clearance as specified.
4. Tighten 2 Black Screws (A) shown in Fig. M18.
5. Reinstall the Main C.B.A.
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