Test Procedures; Console Procedures - Bose 3-2-1GS Series II Service Manual

Console Procedures

CAUTION: The DVD drive mechanism should
not be closed by pushing it shut with no power
applied to the console. Doing so could dam-
age the drive. It must be closed with power
applied so that the locking mechanism inside
the drive will engage properly when the
drawer is closed.
Equipment required:
Console test cable with DC power supply
•
or bass module w/system cable
Audio signal generator
•
Digital multimeter
•
Analog to S/PDIF converter
•
S/PDIF to optical converter
•
AM/FM signal generator
•
Video signal generator or DVD player
•
Abex test DVD (TDV-540A)
•
Video monitor
•
Composite Video cable
•
S-Video cable
•
Optical cable
•
Oscilloscope
•
Model 3 2 1 Series II remote control
• • •
Test Setup
Set up the unit under test as shown in
Figure 1 for the following tests.
1. Analog Audio Test
1.1 Apply a 1 Vrms, 1 kHz signal to the left
and right AUX audio analog inputs.
1.2 On the console, select the AUX input.
Press the volume up (+) button on the
console for 10 seconds to put it at full vol-
ume.
1.3 Measure the output level at the left and
right audio outputs on the console test cable.
It should be 470 mVrms + 10%.
1.4 Repeat steps 1.1 to 1.3 for the CBL-SAT
and TV audio analog inputs.

TEST PROCEDURES

54
2. Coaxial Digital Audio Test
2.1 Connect the audio signal generator to
the input of the analog to S/PDIF converter.
2.2 Connect the output of the S/PDIF con-
verter to the AUX coaxial digital input.
2.3 Apply a 500 mV, 1 kHz signal to the
analog input of the S/PDIF converter. Refer-
ence a dB meter to the signal generator
output signal.
2.4 On the console, select the AUX source.
Press the volume up (+) button on the
console for 10 seconds to put it at full vol-
ume.
2.5 Measure the output signal level at the
analog outputs of the console test cable.
The output should be 0 dB, +0.5/-1.5 dBr.
2.6 Measure the distortion level of the
analog output signal at the left and right
analog outputs of the test cable. The distor-
tion level should be 0.07% maximum.
2.7 Repeat steps 2.1 to 2.6 for the CBL-SAT
digital coaxial input.
2.8 Repeat steps 2.1 to 2.6 for the TV digital
coaxial input.
3. Optical Digital Audio Test
3.1 Connect the audio signal generator to
the input of the analog to S/PDIF converter.
3.2 Connect the output of the S/PDIF con-
verter to the input of the S/PDIF to optical
converter.
3.3 Connect the output of the optical con-
verter to the VIDEO 1 optical input.
3.4 Apply a 250 mV, 1 kHz signal to the
analog input of the S/PDIF converter. Refer-
ence a dB meter to the signal generator
output signal.