Bose 10.2 Stereo Everywhere Manual de servicio - Página 13

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3. Transformer Tap Select Test.
(transformer units only)
3.1 Be sure that the tap selection switch is
in the high position.
3.2 Apply a 25 Volt rms, 100 Hz signal to
the input of the speaker.
3.3 Slowly change the tap selection switch
on the unit from the high position to the off
position.
3.4 A decrease in output level should be
heard for each descending switch position.
Note: Upon completion of testing, be sure
to switch the unit back to the high position,
or where the customer had preset the
control.
4. Phase Test
4.1 Check the wiring with that of Figure 8
to assure that the speaker is wired in
phase.
®
102
System Controller Test
Procedures
Note: The 102 System Controller has two
independent channels of full bandwidth
equalization for music sources; an Opti-
®
Voice
circuit with separate equalization for
voice input, a bass shelf and various
sensitivity and muting features. You must
test all modes of the 102 System Controller
to assure proper operation.
Note: The 102 System Controller input(s)
must be loaded properly in order to get the
correct test output voltage levels.
TEST PROCEDURES
Switch
Bass
Channel B Mute
Channel A Input
Channel B Input
Voice Input
Opti-Voice ®
Channel A output 10 k ohm load
Channel B output 10 k ohm load
13
Equipment Required:
Dual-trace oscilloscope
Audio signal generator
Distortion analyzer
dB meter
Digital voltmeter
Two 10k ohm,1/4W load resistors
Small screwdriver
102 System Controller Initial Switch
Positions
Position
Normal (out)
On
1 Volt
1 Volt
Line
Full counterclockwise
Note: Unless otherwise specified, all
controls will remain in the positions listed in
the 102 Controller Initial Switch Positions
table above.
1. Music Channel Gain Tests
Note: When connecting the audio signal
generator to the controller, do not jumper
the minus (-) terminal to the ground
terminal.
Note: The music channel inputs must be
loaded with a 2k ohm input impedance in
order to get the correct output levels.
1.1 Apply a 1 Volt rms, 1 kHz signal to
both A & B inputs. Reference a dB meter
to the applied signal level.
1.2 The output should be 1 Volt rms,
±
(0 dB
2 dB).
1.3 Reduce the input signal to
100 mV rms, 1 kHz.