Bose 1600-VI, Service Manual

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DISASSEMBLY/ASSEMBLY PROCEDURES
18. Power Supply Board 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 7.
18.2
Seat the regulator board into the
power supply board, see Procedure 6.
18.3
Secure the power supply heatsink
bridge to the heatsink by tightening two
screws (30) with a phillips-head
screwdriver.
18.4
Secure the power supply large
capacitors to the chassis by tightening one
screw into the nylon clamp (21). See
Figure 8.
18.5
Connect all wiring to the power supply
WL1-WL8 terminals.
18.6
Connect all wires attached to the
power supply terminals E5-E17.
18.7
Connect the amplifier board ribbon
cable to the power supply J2 connector.
18.8
Replace the transformer (4) using
procedure 12.
18.9
Replace the cover (1) using
procedure 2.
Note:
Refer to Figures 6 and 7 for the
following procedures.
19. Fan Removal
19.1
Remove the cover (1) using
procedure 1.
19.2
Use procedure 15, Steps 15.2-15.12
to move the heatsink (18), with the ampli-
fier, power supply and regulator boards
attached, to allow access to the fan (23).
19.3
Release the fan and shield (26) from
the chassis back panel by removing two
screws (3) with a phillips-head screwdriver.
The screws are located over the fan
exhaust slot.
19.4
Release the lower shield from the
bottom of the chassis by removing two
screws (3) with a phillips-head screwdriver.
19.5
Disconnect the fan cable (J1) from the
output board (16) J3 connector.
19.6
Lift out the fan and shield. To disas-
semble 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).
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. Align
the fan so that the red and black wires are
on the side of the shield with the 1/2"
space.
20.2
Place the upper shield (27) on the
back of the fan. Use a phillips-head screw-
driver and 5/16" wrench to tighten four
screws (28) and locknuts (12).
20.3
Secure the fan and shield to the
chassis back panel by tightening two
screws (3) with a phillips-head screwdriver.
The screws are located over the fan
exhaust slot.
20.4
Secure the lower shield to the bottom
of the chassis by tightening two screws (3)
with a phillips-head screwdriver.
20.5
Connect the fan cable into the output
board (16) J3 connector (Pin 1 is red,
Pin 2 is black).
20.6
Use procedure 16, Steps 16.4-16.15
to install the heatsink (18) and cabling.
20.7
Replace the cover (1) using
procedure 2.