Bass Module Test Cable Construction - Bose 3-2-1GS Series II Service Manual

Bass Module Test Cable Construction

Parts Required:
1 - 321 Series II system cable, Bose
1 - Female RCA jack, red center, Radio Shack part number 274-337
1 - Female RCA jack, white center, included in Radio Shack part number 274-337
1 - Female RCA jack, yellow center
1 - Female 9 pin DB-9 D-sub connector, Radio Shack part number 276-1538
1 - Plastic project box, Radio Shack part number 270-1803
1 - DB-9 male to DB-9 female cable (null modem cable), Radio Shack part number 26-117
Procedure:
1. Cut the system cable so that you have one section about 4 feet long and another about 6 feet
long. Retain both pieces. You will build the console test cable from the 4 foot section later.
2. Drill holes in the plastic project box to mount your RCA and DB-9 connectors. Refer to the
drawing below.
3. Using a DMM to verify proper wiring, connect the 6 foot section of the system cable's wires to
the left and right analog audio input jacks, the digital SPDIF audio jack and the DB-9 D-sub
connector. Refer to the cable connector pinout diagram and the bass module test cable wiring
table below.
Note: You will use the DB-9 male to DB-9 female cable (null modem cable) to connect this test
cable to your PC. This will allow you to control the bass module by sending Smart Speaker
commands from your PC. Refer to the test procedures for the tests and associated commands.
Note: Be sure to label the connectors on your test cable box so that there is no chance of using
the wrong connector for a test.
12
10 9 8
6 5 4
2 13
FACE OF CONNECTOR
System
Cable Pin
Number
3
7
8
9
10
11
12
13
part number 269997-001
®
11
7
9 pin D-sub
3
1
Signal Name
SPDIF+
DGND/SHIELD
LEFT MINUS (-)
LEFT PLUS(+)
RIGHT MINUS (-)
SPDIF MINUS (-)
RIGHT PLUS(+)
SMART SPEAKER
Bass Module Test Cable Wiring Information
connector
Plastic Project Box
Termination
Ring, RCA Jack, Yellow
Ring, RCA Jack, Yellow (connected to SPDIF+)
Ring, RCA Jack, White
Pin, RCA Jack, White
Ring, RCA Jack, Red
Pin, RCA Jack, Yellow
Pin, RCA Jack, Red
DB-9 connector pins 2, 3
DP-9 connector pins 1, 4, 6, and 8 tied together
70
Left Analog Input
Right Analog Input
System Cable
SPDIF input