Bose T1 ToneMatch, Руководство по обслуживанию

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Test Procedures
4.4 Measure the THD+N level at the master
output jack. Verify that it is <0.05% at
-20dBV.
4.5 Repeat steps 4.1 to 4.4 for channels 2
and 3.
5. Line Input THD+N Test
5.1 Set the channel 1 trim knob, volume
knob and the master volume knob to 5. Set
AUX SEND to 50% for channels 1 to 5.
5.2 Using a balanced TRS input cable, apply
a 1kHz, 0dBV input to the channel 1 input
jack.
5.3 Measure the THD+N level at the AUX
output jack. Verify that it is <0.05% at 0dBV.
5.4 Repeat steps 5.1 to 5.3 for channels 2
to 5.
6. Phantom Power Test
6.1 On the T1 front panel, press the Phan-
tom power button to ON. Verify that the red
LED lights.
6.2 With the Phantom power button on,
measure the DC voltage level on the chan-
nel 1 XLR input jack. Measure pins 2 and 3
relative to pin 1 (GND).
6.3 Measure the DC voltage at pin 2 relative
to pin 1. Verify that it is +48VDC. Measure
the DC voltage at pin 3 relative to pin 1.
Verify that it is +48VDC.
6.4 Repeat steps 6.1 to 6.3 for channels 2
and 3.
7. USB Test
7.1 Using a USB cable, connect the T1 to a
computer running Windows 2000 or higher.
Verify that the PC recognizes the USB port.
8. ToneMatch
®
Operational Test
8.1 Set up the L1 Model II system with the
B1 bass module connected.
8.2 Connect the T1 unit under test to the L1
Model II power stand using the ToneMatch
system cable.
8.3 Set the T1’s channel 1 trim and volume
knobs to 5. Set the master volume knob to
5, or less if needed for listening comfort.
8.4 Using a balanced XLR/Mic cable, apply
a 20Hz, -55dBV signal to the channel 1 Mic/
Line input.
8.5 Sweep the input frequency to the T1
from 20Hz to 20kHz. Listen to the output of
the L1 Model II system. Listen for uniformity
of sound level and clean sound output
across the audio range.