Bose 1800-V Manual page 23

10.3 Connect the cables from the Line Cord (31)
and Power Supply to the terminals of the Line
Filter. Refer to the Wiring Diagrams (Figures 21
and 22) if you are not sure of the wiring scheme.
10.4 Return the cover (1) to the chassis (2), see
Procedure 2.
11. Transformer Removal
11.1 Remove the cover (1), see Procedure 1.
11.2 Disconnect all connectors attached to the
transformer's (4) terminals. Refer to Figure 12.
11.3 Place the chassis (2) on its side.
11.4 While holding the transformer with one
hand, use a phillips-head screwdriver to remove
four screws (13) and washers (14) from the
bottom of the chassis. Refer to Figure 13 and
14.
11.5 Remove the transformer from the chassis.
12. Transformer Replacement
12.1 Place the chassis (2) on its side. Orient the
transformer (4) in the chassis so the six terminal
side of the transformer is next to the large
capacitors of the Power Supply Board (7). Refer
to Figure 12.
12.2 While holding the transformer with one
hand, use a phillips-head screwdriver to tighten
four screws (13) and washers (14) from the
bottom of the chassis. Refer to Figures 13 and
14.
12.3 Return the cables to their designated
terminals on the transformer. Refer to the Wiring
Diagrams (Figures 21 and 22) for proper
connectivity.
12.4 Return the cover (1) to the chassis (2), see
Procedure 2.
13. Amplifier Board Removal
13.1 Remove the cover (1), see Procedure 1.
13.2 Disconnect the following cables (Refer to
Figure 12):
The two ribbon cables connected to the I/O
Board (6) (J101, J201 from the Amplifier Board
(15) ).
The large ribbon cable (JP200) from the Power
Supply Board (7).
The cables connected to WL1, WL2, WL100,
WL101, WL200, WL201 terminals on the Output
Board (16).
NOTE: Some cables are bundled together. Cut
any wire wraps when necessary.
13.3 Use a phillips-head screwdriver to remove
one screw (29) and washer from each of the
twenty-eight transistors that attaches the
Amplifier Board to the heatsink (18). Refer to
Figure 12.
13.4 Lift the Amplifier Board from the heatsink.
14. Amplifier Board Replacement
14.1 Place the Amplifier Board (15) onto the
heatsink (18). Orient the board so that the large
ribbon cable is facing the Power Supply Board
(7). Refer to Figure 12.
14.2 Secure the Amplifier Board to the heatsink
by tightening one screw (29) and washer to each
of the twenty-eight transistors.
NOTE: Make sure the shield (19) is attached to
Q214 and Q216 transistors. Refer to Figure 12
for the shield's orientation.
14.3 Connect the following cables (Refer to
Figure 12):
NOTE: Refer to the Wiring Diagrams (Figures 21
and 22) for the proper connectivity.
The two ribbon cables J101 and J201 to I/O
Board (6) connectors, J100 and J200).
23
(Procedure 14 Continued)