Bose 10.2 Stereo Everywhere Service Manual - Page 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

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)

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.