Sega 999-0921 - Manual (Page 46)

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Take out the 2 truss screws and remove the Front Cover
from the Accel. & Brake unit.
Loosen the screw which secures the Potentiobase, and
adjust the Volume Value by moving the Base.
Secure the Potentiobase.
In the INPUT TEST screen, check to see if the volume
value varies in accordance with operation of the pedal.
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10 - 2 ADJUSTING OR REPLACING THE VOLUME
Check Volume values in the Test Mode.
Since work is performed inside the energized cabinet, be very careful not to touch undesignated portions. Touching
places not specified can cause electric shock or short circuit.
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ADJUSTMENT