Yamaha F-20B Service-Handbuch - Seite 6

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F-20B

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.3, Fig.5)

Power Transformer (Time required: about 4 min)

5-1

Remove the pre-main unit. (See Procedure 1)

5-2

While holding the nuts marked [P70] with a

spanner, remove the two (2) screws marked [P60].

The power transformer can then be removed.

(Fig.4)

MAIN1/2 Circuuit Board

[P40]

[A120]

[P80]

MAIN1/2 Circuuit Board

(Fig. 3)

MAIN

2/2

Power Transformer

[P80]

[P70]

[P60]

MAIN

1/2

[P100], [C]

[A120]: Hexagonal Nut 9.0 12X2 MFNI33 (LX200060)

[A140]: Hexagonal Nut 12.0 14X2 MFNI33 (ES200210)

[P60]: Pan Head Screw 4.0X10 MFZN2BL (V7018000)

[P70]: Hexagonal Nut #1 4.0 MFZN2Y (VB837300)

[P80]: Bind Head Screw-1 3.0X16 MFZN2BL (V7018100)

[P100]: Knob (V6955100)

(Fig. 5)

[P70]

[P60]

(Fig.4)

Power Transformer

[P40]

[P60]

[P70]

[A140]