Test Procedures - Bose Life CD5 Series I Service Manual

GENERAL TEST SETUP
Load the outputs as follows:
Headphone output-33Ω, 1% load.
Audio (A, B, Fixed) outputs-10kΩ load.
Note: The remote control or console
buttons can be used to select sources in
these procedures.
1. AUX Gain Test
1.1 Select AUX.
1.2 Apply a 500mVrms, 1kHz signal to the
left (right) AUX input. Adjust the volume to
maximum. Reference a dB meter to the
applied signal.
1.3 Ground the TAPE, VIDEO and the right
AUX inputs.
1.4 Measure the outputs according to the
following table.
Output
Speaker A (L,R)
Speaker B (L,R)
Tape (L,R)
Fixed (L,R)
Headphone (L,R)
1.5 Repeat this test for the right channel.
Note: This test is the same for the VIDEO
input. Apply a 500mVrms, 1kHz signal to
the left (right) VIDEO input and repeat this
test.
2. AUX Separation Test
2.1 Select AUX.
2.2 Apply a 500mVrms, 1kHz signal to the
left (right) AUX input. Adjust the volume to
maximum. Reference a dB meter to the
applied signal.
2.3 Ground the TAPE, VIDEO, and right
AUX inputs.

TEST PROCEDURES

Min Max
(dB) (dB)
4.2 5.4
4.2 5.4
3.3 4.5
4.2 5.4
5.4 7.4
24
2.4 Measure the outputs according to the
following table.
Output
Speaker A (L,R)
Speaker B (L,R)
Tape (L,R)
Fixed (L,R)
Headphone (L,R)
2.5 Repeat this test for the right channel.
Note: This test is the same for the VIDEO
input. Apply a 500mVrms, 1kHz signal to
the left (right) VIDEO input and repeat this
test.
3. TAPE Gain Test
3.1 Select TAPE.
3.2 Apply a 500mVrms, 1kHz signal to the
left (right) TAPE input. Adjust the volume to
maximum. Reference a dB meter to the
applied signal.
3.3 Ground the AUX, VIDEO and the right
TAPE inputs.
3.4 Measure the FIXED level output. It
should be 8.9 to 9.9dB.
3.5 Repeat this test for the right channel.
4. Volume Control Mute
4.1 Select the AUX input.
4.2 Apply a 500mVrms, 1kHz signal to the
left (right) AUX input.
4.3 Set the volume to minimum at the
speaker A output.
4.4 Measure the gain at the A output
(relative to maximum volume). It should be
≥
-75dB.
Separation (dB)
≥50
≥50
≥50
≥50
≥50