Alto SR500A Service Manual

Test Result
Model No：SR500A Test Date: 20050711 Tester：MO GUO ZHU
Test Item 1. Input
Sensitivity
2. Signal/Noise 3. Distortion at
1W
4. Distortion at
Rated
5. Frequency
Response
Test Conditions
Test Result
FLAT Rated
Output 36V/20V
Load 4 Ω
FLAT Rated
Output 36V/20V
Load 4Ω
FLAT Output
at 2V Load 4Ω
FLAT Rated
Output 36V
Load 4 Ω
FLAT Output at
2V Load 4Ω
Low OUT -3 ±0.5 dBV 80↑ dB 0.8↓ % 0.5 ↓ %
Hi OUT 0.5±0.3 dBV 80↑ dB 0.5↓ % 0.1 ↓ %
TUNER dB dB % %
LINE
CD dB dB % %
AUX dB dB % %
TAPE dB dB % %
TUNER dB dB % %
AUX2
CD dB dB % %
AUX dB dB % %
TAPE dB dB % %
TUNER dB dB % %
AUX3
CD dB dB % %
LOW -44 ±0.5 dBV 60↑ dB 2↓ % 0.5 ↓ %
HI -44 ±2 dBV 60 ↑ dB 2↓ % 0.3 ↓ %
24V dB dB % %
MIC
UNBAL dB dB % %
MIC dB dB % %
LINE dB dB % %
24V dB dB % %
MIC-2
UNBAL dB dB % %
MIC dB dB % %
LINE dB dB % %
24V dB dB % %
MIC-3
UNBAL dB dB % %
MIC dB dB % %
LINE dB dB % %
24V dB dB % %
MIC-4
UNBAL dB dB % %
Remark
1. When the above item are tested, short-circuit the row pin of 1, 2 pin of 313115-1(DSP board)CN1. After
test, remove the short circuit terminal.
2. Load connection: connect 4Ohm load to LOW output, and 8Ohm to Hi output.
3. Please check if bass BOOST circuit is normal. When the bass output is below 17V(ON LOAD),BOOST
circuit does not operate. When the bass output is above 17V(ON LOAD), BOOST circuit starts to operate.
Authorization by： Check by：
01-2

Alto SR500A Specifications

General

Brand	Alto
Model	SR500A
Category	Speakers
Language	English