Tuesday, February 07, 2017

Yamaha YST-FSW150 – Disassembling procedure – Power amplifier circuit diagram

1. Removal of driver
a. Turn the main unit bottom up.
# The bottom grille is fixed to the cabinet with dowels at 4 locations. As a flat blade screwdriver is used for removal, use special care not to cause damage to the cabinet.
b. First, insert a flat blade screwdriver at 4 dowel positions and push up the bottom grille.
c. Next, using the metal blade or the like, push the bottom grille upward until it comes off.
d. Remove 4 screws (1) and then pull out the driver. 
e. Disconnect the connector connected to the terminal of the Driver.
2. Removal of bottom panel 
a. Remove 2 screws (2) and then remove 2 legs.
b. Remove 12 screws (3).
# Screws (3) are identified with arrow marks ( >).
c. Pull out the bottom panel.
d. Remove CB1-5 and then remove the bottom panel.
3. Removal of front panel
# The front panel is fixed to the cabinet with dowels. As a flat blade screwdriver is used for removal, use special care not to cause damage to the cabinet.
a. Remove 2 bushings.
# Used bushing, once removed, cannot be reused. Be sure to use a new bushing in place of the removed used bushing.
b. First, insert a flat blade screwdriver at 2 dowel positions and push up the front panel.
c. Next, using the metal blade or the like, push the front panel upward until it comes off.
4. Removal of rear panel 
a. Remove 8 screws (4).
# Screws (4) are identified with arrow marks ( >).
b. Remove the rear panel.
c. Remove 2 bushings.
# Used bushing, once removed, cannot be reused. Be sure to use a new bushing in place of the removed used bushing.
d. Remove 4 screws (5) and then remove the rear cover.
POWER AMP CIRCUIT DIAGRAM 
CLICK ON THE IMAGES TO ZOOM IN