Yamaha bb404f service manual Circuit Diagram, Wiring 
Page 4
BB404F
 CIRCUIT DIAGRAM
FRONT PICKUP  | FRONT VOLUME  | 
   | 3  | Ω  | 
   |    | 
   | 2  | 500K15A  | 
   |    | 
   | 1  |    | 
REAR PICKUP  | REAR VOLUME  | 
   | 3  | Ω  | 
   |    | 
   | 2  | 500K15A  | 
   |    | 
   | 1  |    | 
 WIRING
MASTER TONE  | OUTPUT  | 
Ω  | 1  |    |    | 
250K  |    | 2  |    | 
   |    |    | 
05A  | 3  | 0.047uF  |    | 
   |    |    | 
BPJJ-03
Upper side: S  | Upper side: N  | 
to bridge ground
   |    |    | BL  | 
GY  |    | GY  |    | 
   |    |    | 
   | BL  | BL  | MASTER TONE  | 
   |    | 
   | RE  | BL  | 05A 250KΩ  | 
   | WH  | RE  |    | 
FRONT VOLUME  | RE  |    | 0.047uF  | 
   |    | 
15A 500KΩ  |    | REAR VOLUME  |    | 
   |    |    | 
   |    | 15A 500KΩ  |    | 
   |    |    | OUTPUT JACK  |