Bose Companion 3 Series II Panduan Servis - Halaman 7

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Bose Companion 3 Series II Panduan Servis

Note: The input voltage should be the actual

voltage present at the input and not the open

circuit generator output.

1. Bass Module Air Leak Test

Note: Connect the system as shown in

figure 1, 6 Ohm mono test setup settings.

1.1 Apply a 6 Vrms, 50 Hz signal to the mono

input terminals of the bass module. Do not

connect the satellite speakers.

1.2 Listen carefully for air leaks from around

the terminal cup, port cap and cabinet

seams.

2. Woofer Phase Test

2.1 Apply a 6 Vrms, 50 Hz signal to both the

CH1 and CH2 stereo input terminals of the

bass module.

2.2 While the signal is being applied to the

bass module, remove the input to one of the

stereo terminals.

2.3 The sound output level should drop by

approximately half. If the sound output level

increases, stays the same, or stops com-

pletely, then there is a wiring problem at the

crossover PCB or woofer.

3. System Sweep Test

3.1 Connect the system as shown in figure

2, stereo test setup settings.

3.2 Apply a 6 Vrms, 10 Hz signal to the

stereo input terminals of the bass module.

3.3 While listening to the output of the sys-

tem, sweep the input frequency slowly from

10 Hz to 500 Hz. The output should cross

over from the bass module to the satellite

speakers.

Note: A whooshing noise from the bass

module port at around 40 Hz and 160 Hz to

180 Hz is acceptable.

TEST PROCEDURES

3.4 Reduce the input level to 3 Vrms.

3.5 Continue sweeping from 500 Hz to 15

kHz. Listen for a clean, undistorted output

from each satellite assembly. Replace any

satellite or woofer that buzzes or sounds

distorted.

4. 70/100 Volt Input Test Procedure

Note: This test is to ensure the transformer

is functioning. Connect the system as shown

in figure 4, 70/100V test setup settings.

4.1 Apply a 13 Vrms, 50 Hz signal to the bass

module at the 70 Volt input terminals.

4.2 Sweep the input frequency from 50 Hz to

500 Hz.

4.3 Apply a 13 Vrms, 50 Hz signal to the 100

Volt input terminals.

4.4 Sweep the input frequency from 50 Hz to

500 Hz.

Note: If the crossover or any components

on the crossover PCB are found to be

defective, replace the entire crossover PCB.