Yamaha MR1642 Service Manual - Page 19

MR842/MR1242/MR1642 7. Removal of MR-B Circuit Board • Remove the Bottom board. (see procedure 1) • Remove the 4 bind tapping screws ®(3x8), the MR-B circuit board can be removed. (Fig.5) 8. Removal of MR-N Circuit Board • Remove the Bottom board. (see procedure 1) • Remove the MR-B circuit board. (see procedure 7) • Remove the 4 bind tapping screws CD(3x13). (Fig.6) • Take the MR-N circuit board out of the unit with the heat sink. (Fig.5) 9. Removal of MR-H and MR-I Circuit Boards • Remove the Bottom board. (see procedure 1) • Remove the 2 bind head screws (i) (3x12) and 2 bind tapping screws ® (3x8), and then remove the Rear pads. l(Fig.6) • Remove the 6 bind tapping screws (:)(3x81, and lift the Rear panel as shown below. (Fig.5, 7) • Remove the 4 bind tapping screws (3x8), the MR-H (MR-I) circuit board can be removed. (Fig.5). 10. Removal of Power Transformer • Remove the Bottom board. (see procedure 1) • Remove the 4 bind head screws ® (4x8), the Power transformer can be removed. (Fig.5) I Heat Sink (aMitg) MR-I 0 MR-H O 7. MR-B- 091- • atgt.At.,t-4-0 (3.*ft(3,) ;/ 7* (3 x 8) 4* }-L. MR-B1-2- l - L 10 (Fig. 5 ) 8 . a)M• • TA4Rt•A Ltto ( 1 *VIP,) • MR-B-1- "i-Lttc, ( 7 x Pf.) • ;":/1 37 7E'/7*:';C) (3 x 8) 4* -M-L. F cfg1.4gLAtz:M-L t (Fig.5) 9. MR-H, Ii -F0)91 L7i • rog•At., tto (1xxviA) ▪ V/,I\4c C, (3x12) 2 L.f" 7* :. 7® (3 x 8) 2 7 Yi-1„ 1"1-Lt (Fig.6) • :/ E','/7* . C) (3 x 8 ) 6 ;# -M- L, to (Fig. , 7 ) • ;/ 1:37 0) '/ (tiP (3x8) 4 7 Y.1-1,-, MR-H (MR-I) - L to (Fig. 5 ) 10. C' F,,s, X0'1•L75 • att .M- L xi_ ) • i" :/1 ,1\*:';8 (4 x 8) 4 *t•AL, 5'fL- (Fig. 5 ) Rear Panel ( u 7,:4)1,) Fig. 5 Power Transtormer MR-B MR-N (WS A) O ' - L 'Z . _1 '2, 020002 q n -0 0 0 04 (0, e II 7( = Fig. 7 ,_ Rear Pad (.1•0:0.D.!QQ.QQ- Rear Pad ( 7,:' 7 F.) Fig. 6 (U7, •y 26