Disassembly Procedures - Yamaha AV-S77 Service Manual

AV-S77
I DISASSEMBLY PROCEDURES
(Remove parts in the order as numbered.)
Disconnect the power cord from the AC outlet.
AV-S77C Disassembly procedures
1. Removal of Grille Ass'y
a. Insert a flat tip screwdriver or the like from the bottom of
the Grille Assembly.
b. Push up the Grille Assembly with the screwdriver
gradually until it can be removed from the main unit.
(Fig. 1).
* The Grille Assembly is fixed securely at 8 dowels.
When removing it, use care not to cause a scratch
or any damage to the main unit. When reinstalling
it, apply quick-drying type bond to the dowels of
the Grille Assembly and fit it in place securely. (If it
is only pushed in, it will come off easily.)
c. Remove 8 screws (1). The OPERTION P.C.B. can
then be removed from the Grille Assembly. (Fig. 1)
2. Removal of Amplifier Unit
a. Remove 6 screws (2). (fig. 1)
b. Remove 7 screws (3) and take out the Amplifier Unit
and OPERATION P.C.B. in the arrow direction. (Fig. 2)
c. Remove the connectors CN304 and CN305. (Fig. 3)
3. Removal of DSP Unit
a. Remove the connectors CB2 and CB3. (Fig. 3)
b. Remove 8 screws (4). The DSP Unit can then be
removed. (Fig. 3)
5
1 1
1 1
1
1
OPERATION P.C.B.
Grill Ass'y
4
CB3
DSP Unit
CB2
2
Bottom
2
Fig. 1
3
3
Amplifier Unit
3
Fig. 2
CN304
CN305
4
4
4
4
Fig. 3