Bose 301 AVM Service Manual download pdf (Page 68)

AV35 Adjustment/Performance Verification Procedures

AM Tuner General Test Setup

Refer to the figure below. The equivalent field

intensity is 26 dB less than the generator output

level or 1/20th of the output voltage. The signal

levels given do not include this factor. Measure-

ments are taken from the record output.

Setup a computer to issue TAP commands. See

page 66 for instructions.

1. AM Sensitivity Performance Verification

1.1 Set the RF generator output for a 55 dBuV/m field

intensity, 30% AM modulation, 1 KHz and the unit and

RF generator to 1080 kHz.

1.2 The headphone output should measure < 10%

THD+N.

2. AM Stop Level Adjustment, TAP

2.1 Set the RF generator to 1080 kHz, 30% AM

modulation, 1 kHz modulation, 57 dBuV/m field

intensity at the unit’s antenna.

2.2 Issue the TAP command TM set 2.

2.3 Set the generator to 1110 kHz , 61 dBuV/m field

intensity.

2.4 Place the unit into seek and verify the unit stops

at 1110 kHz.

2.5 Switch the RF generator for a 51 dBuV/m field

intensity and verify the radio does not stop at 1110

kHz.

FM Tuner General Test Setup

Connect the signal generator to the FM antenna

jack J2001 using a 50 to 75 Ohm matching

network. Adjustments to the procedure’s stated

signal levels should be made to account for a

signal level loss due to the matching network

and/or any other losses.

Setup a computer to issue TAP commands. See

page 66 for instructions.

3. FM Signal to Noise

3.1 Set the RF generator to 98.1 MHz, 1 kHz mono

modulation, pilot off, 75 kHz deviation, 65 dBf at the

unit’s FM antenna input.

3.2 Adjust the unit to 98.1 MHz.

3.3 Reference a dB meter to the left headphone

output.

3.4 Turn off the modulation and pilot. The left

headphone output should measure < -55dBr.

4. FM Sensitivity Verification

4.1 Set the RF generator to 98.1 MHz, 1 kHz mono

modulation, pilot off, 75 kHz deviation, 20 dBf at the

unit’s FM antenna input.

4.2 Measure the distortion at the left or right head-

phone output. It should be < 3.0% THD+N.

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Bose 301 AVM Service Manual Page 68

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