Disassembly Procedures - Yamaha YST-SW205 Service Manual

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I DISASSEMBLY PROCEDURES
(Remove parts in the order as numbered.)
G For exchanging the driver unit
1. Removal of Front Grille
The front grille is fixed to the cabinet with dowels at 6 locations.
As a screwdriver (for slotted head screw) is used for removal, use
special care not to cause damage to the cabinet.
a. Apply the block to the rear panel so as to avoid damage to the
Terminal of the rear panel.
b. Use the screwdriver inserted in the gap between the front grille
and the cabinet (bottom side first), push up the front grille. (Fig. 1)
c. Remove the front grille by lifting it up. (Fig. 1)
2. Removal of Driver unit
a. Remove 4 (8 when YST-SW305) screws (1) in Fig. 2, and
remove the Driver unit.
b. Remove the cable cord.
G For repairing P.C.B.
Repairing P.C.B. is possible without removing front grille.
1. Removal of Front Panel Ass'y
Remove 2 screws (2) and then remove the Front Panel Ass'y in
Fig. 3.
* Use an Allen wrench (3 mm) to unscrew the Front Panel Ass'y.
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L 13942296513
2. Removal of Rear Panel
Remove 4 screws (3) and 12 screws (4) in Fig. 4, and remove
the rear panel. At this time, disconnect the connector CB3 of
MAIN (2) P.C.B.
* When removing the rear panel, replace the packing.
3. P.C.B. Operation Check
a. Disconnect the connector CB9 of MAIN (5) P.C.B.
b. Connect the connector CB3 of MAIN (2) P.C.B. and CB9 of MAIN
(5) P.C.B. by using an extension cable. (Fig. 4)
Extension cable : V7278000 (9P, 700 mm)
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8
Fig. 1
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3 6 7 1 3 1 5
1
Front Panel Ass'y
2
Extension cable
CB9 CB9
co
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YST-SW205/305
9 4 2 8
0 5 8 2 9 9 4 2 8
Fig. 2
Main (5) P.C.B.
Fig. 3
2
4 4
3
CB3
3
4
4
m
Fig. 4
9 9
9 9
4
4
6