Yamaha PSR-VN300 Service Manual - Page 11

PSR-VN300 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 Rubber Contact Rubber Contact [180A] [180B] Rubber Contact Rubber Contact [180A] [180A] [180A] [180B] [180B] 61L 61H [190A] [190A] [190B] [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) Fig. 6-1 61L 61H 9 10 11 12 6 7 8 23 4 5 6 7 8 11 3 4 5 2 Fig. 6-2 11