Test Procedures - Bose BUILT-INvisible TA-1 Service Manual

Test Setup
Note: The commands used in the following
tests can either be issued by an IR remote
control or PC generated (using hyper-
terminal) through the RS-232 (TAP) interface
at J9. Refer to the IR commands table in the
appendix of this manual. There is a built-in
remote receiver located on the Input/Output
PCB behind the IR sensor input connector
(J10). If you aim the IR remote at this con-
nector, the IR command will be received by
IR sensor U11. Refer to the Input/Output
PCB schematic sheet for more information.
The following test procedures use TAP
commands issued by an IBM compatible PC.
The TAP commands are used to emulate
commands that would normally be sent by
an IR remote control, with the exception of
the max volume command (S31101), which
is a Lifestyle ® Smart Speaker command. To
set the amplifier to full volume using an IR
remote, hold the volume up button for 10
seconds.
Setup instructions for the PC and fabrication
instructions for the TAP cable are located in
the appendix.
Equipment Required:
Audio Signal Generator
S/PDIF Analog to Digital Converter
CAT-5 Cable with RJ-45 connectors
75 Ohm RCA to RCA S/PDIF video cable
®
Bose Digital Source plate
IBM Compatible PC w/Windows
TAP Cable
Digital Multimeter
Audio Distortion Analyzer
5 - 8 Ohm, 50 Watt load resistors
1 - 4 Ohm, 150 Watt load resistor
Note: Refer to figures 7 and 8 for the follow-
ing test setup information.

TEST PROCEDURES

®
23
1. Connect the signal generator inputs to the
left and right Music Audio inputs at J6 pins
1, 2, 4 and 5.
2. Place the balanced/unbalanced switches
(S1) to the unbalanced (single-ended)
position. Use a piece of wire to jumper
the negative inputs (J6 pins 2 and 5) to
ground at J6 pin 3.
3. Connect the TAP cable to the amplifiier at
the RS-232 Serial Data Input jack at J9.
Connect the other end to the IBM compat-
ible PC comm port. TAP cable fabrication
and IBM PC setup are outlined in the
appendix of this manual.
4. Connect an 8 Ohm load resistor to the
satellite speaker channels at J12, J13 and
J14. Connect the 4 Ohm load resistor to
the bass channel speaker output at J15.
5. Set the speaker selector DIP switch (S4)
position 1 to the UP position. Set positions
2, 3 and 4 to the DOWN position. Cycle
the AC mains power to allow this change
to go into effect. This will select the Jewel
®
Cube satellite EQ for the following tests.
6. Issue the following commands to the
amplifier under test via hyperterminal.
These commands will put the TA-1 ampli-
fier into the proper mode for testing.
Note: These commands are case
sensitive.
- ICA (selects music audio inputs)
- I78 (DRC off)
- IF4 (film EQ off)
- IA0 (1-to-5 off)
- IDA (bass boost to mid)
- IB2 (treble boost to mid)
- ID0 (surround mode)
- IF7 (center channel level to mid)
- IF9 (surround channel level to mid)
- S31101 (sets amplifier volume to max)