Yamaha Portatone PSR-VN300 Service Manual page 11

10. Circuit Board 61L, Circuit Board 61H
10-1 Remove the lower case keyboard assembly. (See procedure 7)
10-2 Circuit Board 61L (Time required: About 6 minutes)
10-2-1 Remove the keyboards from C1 to B3. (See procedure 8)
10-2-2 Remove the four (4) screws marked [180A], and eight (8) screws marked [190A].
The circuit board 61L can then be removed. (Fig. 6-1)
* When installing the circuit board 61L, tighten the screws 1 through 12 in numerical order. (Fig. 6-2)
10-3 Circuit Board 61H (Time required: About 5 minutes)
10-3-1 Remove the keyboards from C4 to C6. (See procedure 8)
10-3-2 Remove the three (3) screws marked [180B], and five (5) screws marked [190B].
The circuit board 61H can then be removed. (Fig. 6-1)
* When installing the circuit board 61H, tighten the screws 1 through 8 in numerical order. (Fig. 6-2)
• Top view
Rubber Contact
[180A]
61L
[180A] : Bind Head Tapping Screw-B 3x8 MFZN2W3 (WE774300)
[180B] : Bind Head Tapping Screw-B 3x8 MFZN2W3 (WE774300)
[190A] : Bind Head Tapping Screw-P 3x12 MFZN2W3 SP (WH899400)
[190B] : Bind Head Tapping Screw-P 3x12 MFZN2W3 SP (WH899400)
9
2 3
Rubber Contact Rubber Contact
[180A] [180A]
[190A] [190A]
61L
10 11
4 5 6 7
[180A] [180B]
Rubber Contact
Fig. 6-1
61H
12 6
8 1 1 3
Fig. 6-2
Rubber Contact
[180B] [180B]
[190B]
7 8
4 5 2
PSR-VN300
61H
11