Yamaha F-20B Service Manual - Page 5

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Also for Yamaha F-20B: Owner's Manual (7 pages), Installation Manual (12 pages)

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DISASSEMBLY PROCEDURE

Pre-Main Unit (Time required: about 2 min)

1-1

Remove the eight (8) screws marked [A]. The back

board can then be removed. (Fig.1)

1-2

Pull out the speaker wires. (Fig.1)

1-3

Remove the four (4) screws marked [30]. The pre-

main unit can then be removed by sliding it

backward. (Fig.1)

Speaker (Time required: about 2 min)

2-1

Remove the back board. (See Procedure 1-1)

2-2

Pull out the speaker wires. (Fig.1)

2-3

Remove the four (4) screws marked [60a]. The

speaker can then be removed. (Fig.1)

MAIN 1/2 Circuit Board

(Time required: about 4 min)

3-1

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

3-2

Remove the five (5) knobs marked [P100] and the

five (5) hexagonal nuts marked [C]. (Fig.5)

3-3

Remove the hexagonal nut marked [A120] and the

hexagonal nut marked [A140]. (Fig.5)

3-4

Push the hooks of the spacer support (at the arrow

symbol area of illustration) with a needle-nose plier

to unlock.

The MAIN 1/2 circuit board can then be removed.

(Fig.2)

Needle-nose plier

[P40]

MAIN1/2 Circuit Board

(Fig. 2)

Pre-Main Unit

[30] x 4

(Fig.1)

[30]: Truss Head Screw 4.0X25 MFZN2BL (VN347600)

[A]: Bind Head Tapping Screw 4.0X25 FCRM3-BL (EI340256)

[60a]: Bind Head Screw (VB403600)

Pre-Main Unit

Speaker

[60a]

[A]

F-20B

BackBoard