Nakamichi 481 Service Manual - page 35
5.11. Flywheel Holder Adjustment
(1) Refer to Fig. 5.18.
Tighten the Thrust Screws until the gap between the Flywheel
Assemblies and Thrust Screws becomes minimized when both of
the Capstan Shafts are moved backwardly and forwardly (the Thrust
Springs between the Capstan Flanges and Flywheel Thrust Caps
are in a flat state).
Excessive tightening of the Thrust Screws however will give
damages on the Flywheel Assemblies, to which careful attention is
invited.
(2) Return the Thrust Screws by 1/2 turn.
(3) Fixing the Thrust Screws with a screwdriver, lock the Lock Nut.
(4) Apply a quantity of lock tight paint to the Thrust Screws.
5.12. Eject Wire Adjustment
(1) Referring to Fig. 5.19.1, insert a 1.5 mm spacer between the Eject
Arm and Eject Stopper by turning the Eject Arm in the illustrated
direction, then set the N-481 in playback mode.
(2) With pushing the Eject Arm by hand, loosen the screw and then pull
the Eject Wire in the direction of
the arrow until it stops as shown in Fig. 5.19.2.
(3) Tighten the screw, then apply a quantity of lock tight paint.
5.13. Lubrication
N-481 is a lubrication-free cassette deck except when parts are replaced.
Apply the following lubricant for each replaced part:
(1) LAUNA#100
Capstan Shaft
Pressure Roller Shaft
Thrust Cap
(2) FLOILGB-TS-1
Reel Hub Shaft
Thrust portion on the Capstan Shaft
FLOlL GB-TS-1, made by Kanto Chemicals Co., Ltd.
in Japan.
We suggest you use the above or equivalent type. If
unavailable please contact Kanto Chemicals Co., Ltd.,
2-7 Kanda Suda-cho Chiyoda-ku, Tokyo 101 Japan.
(3) Silicon Oil #3000 CST
Air Damper Piston
Note: Excessive lubrication may cause defective damper action as
the 0.2 0 hole at the end of the cylinder may be filled with oil.