Bose 1600-VI, Руководство по обслуживанию

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14.5
Connect the amplifier and power
supply board (7) cables to the output board
(16) WL1, WL2, WL100, WL101, WL200
and WL201 terminals. Refer to Wiring
Diagram Figure 19.
14.6
Replace the cover (1) using
procedure 2.
Note:
Refer to Figures 7, 8 and 9 for the
following procedures.
15. Output Board Removal
15.1
Remove the cover (1) using
procedure 1.
15.2
Disconnect the display board (5)
wiring harness from the I/O board (6) J3
connector.
15.3
Disconnect the amplifier board (15)
two ribbon cables from the I/O board
J100 and J200 connectors.
15.4
Make a note of the wiring configuration
and disconnect the cables connected to the
output board (16) WL1, WL2, WL100,
WL200 and WL201 terminals.
15.5
If necessary, unsolder the red and
white wires from the I/O board E10 and E11
terminals. They are located near the
amplifier board transistor shield (19).
15.6
Make a note of the wiring configuration
and disconnect the cables from the power
supply WL1-WL8 terminals. WL8 is located
near the large power supply capacitors.
15.7
Make a note of the wiring configuration
and disconnect all of the cables connected
to the transformer.
15.8
Using a phillips-head screwdriver,
remove one screw from the nylon clamp
(21) that fastens the power supply
capacitors (7) C4-C7 to the chassis (2).
DISASSEMBLY/ASSEMBLY PROCEDURES
Note:
Some cables are bundled together.
Cut any wire wraps when necessary.
13.5
Note the locations of RT100, RT200,
Q104 and Q204 at the corners of the
amplifier board and their placement against
the heatsink.
13.6
Remove one screw (29) and washer
from each of the twenty-eight transistors
that attaches the amplifier board to the
heatsink (18).
Note:
Make a note of the location and
alignment of the shield over Q214 and
Q216.
13.7
Lift the amplifier board from the
heatsink.
14. Amplifier Board Replacement
14.1
Place the amplifier board (15) onto
the heatsink (18). Align the board so that
the large ribbon cable is facing the power
supply board (7). Be sure that RT100,
RT200, Q104 and Q204 are aligned
properly against the heatsink and that they
have sufficient heatsink compound
between the component and the heatsink.
14.2
Secure the amplifier board to the
heatsink by tightening one screw (29) and
washer to each of the power transistors.
Torque the screws to 5.7 inch-pounds.
Note:
Make sure the shield (19) is at-
tached to Q214 and Q216 transistors.
Refer to Figure 6 for shield alignment.
14.3
Connect the two ribbon cables J101
and J201 to I/O board (6) connectors, J100
and J200).
14.4
Connect the large ribbon cable
(JP200) to the power supply board (7)
connector J2.