Bose 1800-V Manual page 24

The large ribbon cable (JP200) to the Power
Supply Board (7) connector J2.
The Amplifier and Power Supply Board (7)
cables to the Output Board's (16) WL1, WL2,
WL100, WL101, WL200 and WL201 terminals.
14.4 Return the cover (1) to the chassis (2), see
Procedure 2.
15. Output Board Removal
15.1 Remove the cover (1), see Procedure 1.
15.2 Disconnect the following cables (Refer to
Figure 12):
NOTES: Some cables are bundled together. Cut
wire wraps when necessary.
The Display Board's (5) wiring harness from the
I/O Board's (6) J3 connector.
The Amplifier Board's (15) two ribbon cables
from the I/O Board's J100 and J200 connectors.
The cables connected to the Output Board's (16)
WL1, WL2, WL100, WL200 and WL201
terminals.
Unsolder the red and white wires from the I/O
Board's E10 and E11 terminals. They are located
near the Amplifier Board's transistor shield (19).
The cables from the Power Supply's WL1-WL8
terminals.
All the cables connected to the transformer.
15.3 Use a phillips-head screwdriver and 5/16
wrench to remove one screw (20) and locknut
(12) from the nylon clamp (21) that fastens the
Power Supply's (7) large, C4-C7 capacitors to
the chassis (2). Refer to Figures 12 and 14.
15.4 Use a phillips-head screwdriver to remove
four screws (29) from the two brackets (22) that
secures the heatsink (18) to the inside of the
chassis's back panel. Refer to Figure 14.
15.5 To release the heatsink base from the
bottom of the chassis, use a phillips-head
screwdriver to remove four screws (3) from the
chassis's bottom panel. Refer to Figure 14.
15.6 Move the entire heatsink away from the
Output Board.
15.7 Disconnect the fan's (23) J1 connector from
the Output Board's J3 connector. Refer to Figure
13.
15.8 Disconnect the I/O Board's ribbon cable
from the Output Board's J2 connector. Refer to
Figure 13.
15.9 Use a phillips-head screwdriver to remove
two screws (11) that fasten the Output Board to
the bottom of the chassis. Refer to Figure 13.
15.10 Use a phillips-head screwdriver to remove
two screws (11) on the back panel that attach to
two brackets on the Output Board. They are
located underneath the red and black binding
posts. Refer to Figure 10.
15.11 Use an 11/32 wrench and remove four
nuts from the Binding Posts (items 24 or 25).
Refer to Figure 13. Release the wires from the
posts.
15.12 Lift the Output Board out of the chassis.
16. Output Board Replacement
16.1 Place the Output Board (16) into the chassis
(2). Orient the board so the two brackets on the
board face the back panel of the chassis.
16.2 Secure the Output Board to the bottom of
the chassis by tightening two screws (11) with a
phillips-head screwdriver. Refer to Figure 13.
16.3 Use a phillips-head screwdriver to tighten
two screws (11) into the Output Board's two
brackets. The screws are driven from the outside
of the back panel. Refer to Figure 10.
24
(Procedure 16 Continued)