Yamaha F-20 Service Manual page 6

F-20
4. MAIN 2/2 Circuit Board (Time required: about 3 min)
4-1 Remove the pre-main unit. (See procedure 1)
4-2 Remove the screw marked [C80]. The MAIN 2/2 circuit board can then be removed. (Fig.5)
5. Power Transformer (Time required: about 4 min)
5-1 Remove the pre-main unit. (See procedure 1)
5-2 While pushing down the nut marked [P70] with a spanner, remove the two (2) screws marked [P60]. The power
transformer can then be removed. (Fig.4)
MAIN2/2 Circuit Board MAIN2/2 Circuit Board
[P40]
[A120]
6
[C80] [C80]
MAIN1/2 Circuit Board MAIN1/2 Circuit Board
(Fig. 3)
MAIN 2/2
[P100], [C]
Power Transformer Power Transformer
[C80] [P70] [P60]
MAIN 1/2
[A120]: Hexagonal Nut 9.0 12X2 MFNI33 (LX200060)
[A140]: Hexagonal Nut 12.0 14X2 MFNI33 (ES200210)
[C80]: Bind Head Tapping Screw-1 3.0X16 MFZN2BL (EP030310)
[P70]: Hexagonal Nut #1 4.0 MFZN2Y (VB837300)
[P60]: Pan Head Screw 4.0X10 MFZN2BL (V7018000)
[P100]: Knob (V6955100)
(Fig. 5)
[P70] [P70] [P60] [P60]
ransformer
(Fig. 4)
Power Transformer
[P40] [P60] [P70]
[A140]