Bose 1800-V Manual page 27

18. Power Supply Replacement
18.1 Attach the Power Supply Board (7) to the
heatsink (18) by tightening four screws (30) into
each corner of the board. Use a phillips-head
screwdriver. Refer to Figure 14.
18.2 Seat the Regulator Board into the Power
Supply Board, see Procedure 6.
18.3 Secure the Power Supply's heatsink bridge
to the heatsink by tightening two screws (30) and
washers with a phillips-head screwdriver. Refer
to Figure 15.
18.4 Secure the Power Supply's large capacitors
to the chassis by tightening one screw (20) and
locknut (12) into the nylon clamp (21). Use a
phillips-head screwdriver and 5/16 wrench. See
Figure 14.
18.5 Connect the following (Refer to Figure 12):
NOTE: Refer to the Wiring Diagrams (Figures 21
and 22) for proper connectivity.
Connect all wiring back to the Power Supply's
WL1-WL8 terminals.
Solder all wires designated to the Power Supply
E5-E17 terminals .
Connect the Amplifier Board's ribbon cable to the
Power Supply's J2 connector.
18.6 Return the cover (1) to the chassis (2), use
Procedure 2.
19. Fan Removal
Refer to Figure 13 for the location of the fan and
shields.
19.1 Remove the cover (1) from the chassis (2),
use Procedure 1.
19.2 Use Procedure 15, Steps 15.2-15.6 to
move the heatsink (18) (with the Amplifier, Power
Supply and Regulator Boards attached) and to
allow access to the fan (23).
19.3 Release the fan and shield (26) from the
chassis's back panel by removing two screws (3)
with a phillips-head screwdriver. The screws are
located over the fan's exhaust slot. Refer to
Figure 10.
19.4 Release the lower shield from the bottom of
the chassis by removing two screws (3) with a
phillips-head screwdriver. Refer to Figure 14.
19.5 Disconnect the fan's cable (J1) from the
Output Board's (16) J3 connector.
19.6 Lift out the fan and shield. To disassemble
the fan from the shields, (upper (27) and lower
(26)) use a phillips-head screwdriver and 5/16"
wrench to remove four screws (28) and locknuts
(12). Refer to Figure 13.
20. Fan Replacement
20.1 Place the fan (23) label-side down onto the
lower shield (26). The fan is seated flush on one
side of the lower shield and a 1/2" space on the
other side. Orient the fan so the red and black
wires are on the side of the shield with the 1/2"
space. Refer to Figure 13.
20.2 Place the upper shield (27) on the back of
the fan. Use a phillips-head screwdriver and 5/
16" wrench to tighten four screws (28) and
locknuts (12).
20.3 Secure the fan and shield to the chassis's
back panel by tightening two screws (3) with a
phillips-head screwdriver. The screws are located
over the fan's exhaust slot. Refer to Figure 10.
20.4 Secure the lower shield to the bottom of the
chassis by tightening two screws (3) with a
phillips-head screwdriver. Refer to Figure 14.
20.5 Connect the fan's cable into the Output
Board's (16) J3 connector (Pin 1 is red, Pin 2 is
black).
20.6 Use Procedure 16, Steps 16.7-16.11 to
install the heatsink (18) and cabling.
20.7 Return the cover (1) to the chassis (2), use
Procedure 2.
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