Yamaha AO8 Service Manual page 13

7. MB1 Circuit Board
7-1 Remove the mother assembly. (See Procedure 6.)
7-2 Remove the nine (9) screws marked [30] and the five (5)
screws marked [50]. The MB1 circuit board can then be
removed. (Fig. 4)
8. IFC3 Circuit Board
8-1 Remove the mother assembly. (See Procedure 6.)
8-2 Remove the six (6) screws marked [70]. The IFC3 circuit
board can then be removed. (Fig. 4)
9. Side Panel Assembly
9-1 Remove the UNC card assembly. (See Procedure 1.)
9-2 Remove the front panel assembly. (See Procedure 2.)
9-3 Remove the top panel. (See Procedure 4-3.)
9-4 Remove the mother assembly. (See Procedure 6.)
9-5 Remove the eight (8) screws marked [450] and the two (2) screws
marked [452]. Each mount bracket can then be removed. (Fig. 5)
9-6 Remove the seven (7) screws marked [200]. The side
panel (L) can then be removed.
9-7 Remove the three (3) screws marked [170] and the five (5)
screws marked [180]. The upper chassis can then be
removed. (Fig. 2, Fig. 3)
9-8 Remove the seven (7) screws marked [260]. The side
panel assembly can then be removed. (Fig. 5)
• Mother Assembly
IFC3
[30]
[50]
[30]: Bind Head Tapping Screw-B 3.0x6 MFZN2BL (EP600230)
[50]: Bind Head Tapping Screw-B 3.0x6 MFZN2BL (EP600230)
[70]: Bind Head Tapping Screw-B 3.0x6 MFZN2BL (EP600230)
MB1
Fig. 4
<Left Side View>
Side panel L
<Right Side View>
Mount bracket
[70]
[450]
[452]
<Rear View>
[260]
[200]: Bind Head Tapping Screw-B A4.0x8 MFZN2BL (VC688800)
[260]: Bind Head Tapping Screw-B A4.0x8 MFZN2BL (VC688800)
[450]: Oval Head Screw 4.0x8 MFZN2BL (VS153600)
[452]: Oval Head Screw B4.0x10 MFZN2BL (V6221000)
Mount bracket
[200]
[452]
[200]
Side panel assembly
[260]
Fig. 5
AO8
[450]
9