Bose 1600-VI Service Manual download pdf (Page 25)

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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.

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