Bose BUILT-INvisible TA-1 Service Manual page 28

8.3 Verify that the TA-1 center channel output
at J13 pins 1 and 2 is +33.7 dB + 1.5 dB.
8.4 Move the output of the A/D converter
to the Digital Source 2 input of the Digital
Source plate. Issue the VIDEO 2 source
select command (I48) to select S/PDIF input
2 on the TA-1 amplifier.
8.5 Apply a 100 mVrms, 1 kHz S/PDIF
encoded mono signal from the A/D con-
verter.
8.6 Verify that the TA-1 center channel output
at J13 pins 1 and 2 is +33.7 dB + 1.5 dB.
8.7 Move the output of the A/D converter
to the Digital Source 3 input of the Digital
Source plate. Issue the AUX source select
command (IC8) to select S/PDIF input 3 on
the TA-1 amplifier.
8.8 Apply a 100 mVrms, 1 kHz S/PDIF
encoded mono signal from the A/D con-
verter.
8.9 Verify that the TA-1 center channel output
at J13 pins 1 and 2 is +33.7 dB + 1.5 dB.
8.10 Move the output of the A/D converter to
the Digital Source 4 input of the Digital
Source plate. Issue the TAPE source select
command (I28) to select S/PDIF input 4 on
the TA-1 amplifier.
8.11 Apply a 100 mVrms, 1 kHz S/PDIF
encoded mono signal from the A/D con-
verter.
8.12 Verify that the TA-1 center channel
output at J13 pins 1 and 2 is +33.7 dB + 1.5
dB.
9. TV Sensor Test
9.1 With the TA-1 amplifier OFF, momentarily
apply +5 Vdc to the TV Sense ON
input at J11-1. The TA-1 amplifier should
power up. You can obtain the needed
+5 Vdc level at J10 pin 4.
TEST PROCEDURES
28
10. Relay K1 Test
Note: Music Center Input pins 1 and 2 of J8
(normally used for the 10 Vdc turn-on and
serial data input from the music center) can
also be used for RS-232 Tx (transmit) and
Rx (receive) respectively. These tests will
check proper operation of relay K1 which
performs this switching. Refer to the Input/
Output board schematic diagram for more
information.
Test Setup:
- Connect the TAP cable to the serial data
COM port on the rear of the computer.
- Connect the other end of the TAP cable to
J8 pins 1 and 2. Pin 1 is used for Rx (re-
ceive) and pin 2 is used for Tx (transmit).
- Set up the serial data COM port as shown
in the Appendix (4800 baud, 8 data bits,
no parity, 1 stop bit [8N1]).
10.1 Connect a jumper wire from J10 pin 4
(+5 Vdc) to J8 pin 3 (ANT/DTR). This will
activate relay K1.
10.2 On the PC, open a Hyperterm window
and connect to the TA-1 amplifier. In the
Hyperterm window, click on CALL, then
CONNECT. You should hear 3 beeps indicat-
ing the the PC is connected to the TA-1
amplifier.
10.3 Click in the Hyperterm window. On the
PC keyboard, enter the following command.
Ben
This will enable you to communicate directly
with the DSP board. Next enter:
ef ff
Your command will not echo on the computer
screen. Within 2 seconds you should see the
following response in the Hyperterm window.
OK
Press CTRL-S on the keyboard to return to
normal communications mode.