2. Circuit Boards And Units - Yamaha AD824 Service Manual

AD824
DISASSEMBLY PROCEDURE
1. Top Cover
1-1 Remove the fourteen (14) screws marked [500]. The top
cover can then be removed. (Fig. 1)
2. Circuit Boards and Units
Remove the top cover, each circuit board and unit can
then be removed.
Circuit Board and Unit
MAIN
HA
DC Assembly
Power Transformer
<Top View>
Top cover
HA
[460]
[500]: Bind Head Tapping Screw-B A4.0X8 MFZN2BL (VC688800)
3. JK Circuit Board and AD Circuit Board
3-1 Remove the top cover. (See procedure 1.)
3-2 Remove the HA circuit board. (See procedure 2.)
3-3 Remove the two (2) screws marked [430]. The AD shield
sheet can then be removed. (Fig. 4)
3-4 Remove the six (6) screws marked [390] and the two (2)
screws marked [400]. The JK circuit board can then be
removed. (Fig. 2 and Fig. 3)
4. AD Circuit Board
4-1 Remove the top cover. (See procedure 1.)
4-2 Remove the HA circuit board. (See procedure 2.)
4-3 Remove the JK circuit board. (See procedure 3.)
4-4 Remove the six (6) screws marked [330], the two (2)
screws marked [350] and the two (2) screws marked
[370]. The AD circuit board can then be removed. (Fig. 2
and Fig. 3)
10
Ref. No.
A Screw
290 Bonding Screw 4.0X8 MFZN2BL (VS154500)
300 Bonding Screw 3.0X6 MFZN2BL (VS863000)
310 Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)
450 Bonding Tapping Screw 3.0X8 MFZN2BL (VN41330)
460 Bind Head Tapping Screw-B 3.0X6 MFZN2BL (EP600230)
210 Bind Head Tapping Screw-B A4.0X6 MFZN2BL (VC688800)
190 Bind Head Tapping Screw-B A4.0X6 MFZN2BL (VC688800)
[500] X14
MAIN
[310]
Fig. 1
Screw
<Rear View>
[290] [A] [A] [300]
[530]
IF plate
[330]: Bonding Tapping Screw-B 3.0X8 MFZN2BL (VN413300)
[390]: Bonding Tapping Screw-B 3.0X8 MFZN2BL (VN413300)
[530]: Bind Head Screw A4.0X12 MFZN2BL (VP156900)
QTY
4
1
2
5
16
4
2
4
[450] X16
[330] [330] [390]X6
Fig. 2
Fig.
2
2
2
1
2
1
5
5