Bose 1600VI Service Manual page 29

DISASSEMBLY/ASSEMBLY PROCEDURES
Note: Refer to Figure 6 for the following
procedures.
21. I/O Board Removal
21.1 Use Procedure 15, Steps 15.1-15.12
to remove the chassis cover (1), disconnect
cabling, and to move the heatsink (18),
which will allow access to the I/O board (6).
21.2 Disconnect the I/O board ribbon cable
from the output board (16) J2 connector.
21.3 To release the I/O board from the
chassis back panel, use a phillips-head
screwdriver to remove four screws (11)
from the board standoffs.
21.4 If necessary, unsolder the cables from
the I/O board E1-E9 terminals.
21.5 Lift the I/O board from the chassis.
22. I/O Board Replacement
22.1 Place the I/O board (6) into the
chassis (2) with the component side of
the board facing the back panel.
22.2 Solder the cables from the display (5)
and power supply board (7) to the I/O
board E1-E9 terminals if they were
unsoldered in Procedure 21.4. Refer to the
wiring diagrams Figures 19 and 20 for
proper connection.
22.3 Connect the I/O board ribbon cable to
the output board (16) J2 connector.
22.4 Attach the I/O board to the chassis
back panel by tightening four screws (11)
with a phillips-head screwdriver. The
screws are driven from the outside of the
back panel.
22.5 Use Procedure 16, Steps 16.4-16.15
to install the heatsink (18) and cables.
22.6 Replace the cover (1) using
procedure 2.
Note: Refer to Figures 4, 10 and 11 for the
following procedures.
23. Input Module Removal
23.1 Use a phillips-head screwdriver to
remove two screws (3) from the input
module (17) connector panel.
23.2 Pull the input module out of the
chassis (2).
23.3 Disconnect the I/O board (6) ribbon
cable from the input module J1 connector.
23.4 Once the input module is out of the
amplifier chassis the equalization cards can
be accessed.
24. Input Module Replacement
24.1 Slide the input module (17) into its
slot far enough so you can connect the I/O
board (6) ribbon cable into the input
module J1 connector.
24.2 Slide the input module into the
chassis slot until the input module J2
connector is completely seated into the
I/O board two-pin harness connector.
The input module should be flush with the
chassis back panel.
24.3 Secure the input module to the
amplifier chassis by tightening two screws
(3) with a phillips-head screwdriver.
Figure 10. Input Module Screw Location
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