Alto SR500A Скачать руководство пользователя страница 13

TESTING PROCEDURE 

 

 

 
- Switch ON the LOW amplifier output to 4

Ω 

load resistor and repeat the above booster check 

verifying more or less the same ± VCC1 conditions and verify that the signal must be 
symmetrical refer to GND, without detectable distortion and oscillation. 
Increase the VOLUME pot. until a signal clipping. 
Switch OFF the LOW amplifier out. to 4

Ω 

load resistor 

 
 

 

 

Par. 5: COMPRESSOR check of LOW amplifier 

-Increase the input signal of 10 dB and check the out. signal  to remain constant at  45V

peak

 and 

if  the Signal/Comp. led has changed the lighted colour, from GREEN  to RED. 
 
 

 

 

Par. 6: PTC function check on Heatsink 

- Heat the PTC temperature sensor with a welder heated tip, in touch with its body, to verify this 
protection works properly reducing the amplifier out. signal to few volts on time. 
P.S. The check must be done with PTC, placed into heat-sink hole and silicon grease on. 
 
 

 

 

Par. 7: Idle current setting of LOW amplifier 

- Decrease to zero the signal generator, then, adjust VR1 trimmer to have a 5mV ±0,5mVdc 
voltage drop across R24 & R26 (0,2 

Ω)    

 power resistors. 

 
 

 

 

Par. 8: HIGH amplifier check . 

- Select a 10KHz frequency with 1dB amplitude on signal generator. 

-

  Connect CH2 probe tip of scope on HIGH amplifier output. 

-

  Check that the high amplifier power output signal is 20

2V

PEAK 

 (18V

RMS

). 

- Switch ON the HIGH amplifier output to 8

Ω 

load resistor and increase the VOLUME pot.  -

Verify the out. signal is limited to 22V

peak

-

  Switch OFF the HIGH amplifier output to 8

Ω 

load resistor. 

Part .9: Burn-in test  

1.  Connect the pink noise signal from CD player with the line input of speaker module.  
2.  Connect 4ohm 500W load resistor with the bass output.  
3.  Connect 8ohm 300W load resistor with the treble output. 
4.  Put band switch to the position 1, and then turn on the power switch of speaker module.  
5.  Adjust the pink noise level from CD player until SIGNAL/LIMIT indicators (red, green) sparkle.  
6.  Put the speaker module vertical and take the burn-in test for 2 hours.  
 
                               

Part .10: Final inspection 

1.  Check the electronic performance of the tested unit completely. 
 
Note: remove the short-circuit connector of 313115-1 CN1 after test. 
 
 
 
 
 
 

05-2

Содержание SR500A

Страница 1: ...Service Manual ALTO REV 2 Model SR500A...

Страница 2: ...CONTENTS 1 Specifications 2 Block Diagram 3 Schematic Diagram 4 Printed Circuit Board 5 Test Procedures 6 Structural Drawing 7 Exploded View Mechanical Parts List 8 Electrical Parts List...

Страница 3: ...50V V V Load____ 70V V V Load____ 100V V V Aux At 1KHz FLAT Rated W 5 Maximum at Output 10 THD Aux 1KHz dB Load W W FLAT 7 Hum or Noise VR Max Low 25 mV mV DSP OFF VR Max Hi 20 mV mV DSP OFF 8 100HZ d...

Страница 4: ...B 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...

Страница 5: ...P AMP LOW V V V V HI POWER SUPPLY SWITCH LOW SPEAKER HI SPEAKER LOW V LOW V HI V HI V AC INPUT 238094 DSP MODULE HPF LPF Title Size A3 Number Date File Sheet of Drawn By Revision SR500A SR500A 1 1 MO...

Страница 6: ...11 12 13 14 CN1 CN 7PX2 F C17 47u 63V 1 2 3 _ IC1A 33079 C7 22P R4 10K R5 10K C6 0 0033u R3 6K8 14 13 12 _ IC3D 33079 1 3 2 DL1 SIGN LIMIT R9 1K2 15V 15V 5VD 15V 15V NC 1 OUT 2 NC 3 GND 4 GND 5 NC 6 V...

Страница 7: ...R37 4E7 C35 0 0047U 7 6 5 _ IC7B MC33078 1 2 3 4 8 _ IC7A MC33078 R94 10K R93 22K R98 1K R92 1K R90 100K DL2 100P C40 100P D33 4148 D32 4148 VCC1 VCC1 VCC2 VCC2 Vin 1 GND 2 Vout 3 IC5 7815 C43 10 25V...

Страница 8: ...03 4...

Страница 9: ...04 1...

Страница 10: ...04 2...

Страница 11: ...04 3...

Страница 12: ...probe to amplifier high output Par 3 Initial test Increase slowly the VARIAC voltage up to the nominal value 230Vac Check the transformer sec voltages with multimeter without signal on input F3 F4 54...

Страница 13: ...generator then adjust VR1 trimmer to have a 5mV 0 5mVdc voltage drop across R24 R26 0 2 power resistors Par 8 HIGH amplifier check Select a 10KHz frequency with 1dB amplitude on signal generator Conn...

Страница 14: ...7 SR500A FLAT 3 Frequency Response at2 Color Line Style Thick Data Axis Cursor1 Blue Solid 2 Anlr Bandpass Left 104 920 dBr A_ 60 110 70 80 90 100 104 92 103 097 d B S P L 20 30k 50 100 200 500 1k 2k...

Страница 15: ...06 1...

Страница 16: ...06 2...

Страница 17: ...06 3...

Страница 18: ...07 1...

Страница 19: ...ape head 8 M4 30mm 8 13 NI03152 handle ABS 85 6 207 7 black_V1 0 2 14 MG00536 balck screw pill M4 20_V1 0 12 15 NI03151 handle cover ABS SR400A SR500SA black_V1 0 2 16 NC00689 K speaker wooden box SR5...

Страница 20: ...SR 500A 15 435 18 2 0t black_V1 1 2 0014 ND00398 EV foam SR500A SUB 1205 5 15 2_V1 0 1 0015 ND00397 EV foam 204 5 186 5 2 black_V1 0 1 0016 HK05280 speaker 15inch 300W 4 SR500A Z008289_LP385 75 1 000...

Страница 21: ...0 7 2135 1220 14 31kg 1 0038 MF00037 washer 3 2 5 5 1t 15 0039 MF00038 washer 4 7 1t 1 0040 NC00128 washer 1 6 6 8 3 5 red 11 0001 NC00172 insulation board 1 6t 65mm 0 2mm 100M 1 0041 NC00005 mica SB...

Страница 22: ...00V 1 C4 0031 CF00014 metal film capacitor MEC 0 01uF 400V 10 2 C11 C12 0032 CH00017 laminated capacitor 0 1uF 50V Y5V PH5 2 C23 C26 0033 CB00010 electrolytic capacitor 1uF 50V 4 7mm 2 C1 C29 0034 CB0...

Страница 23: ...HC00050 row wire header 14PIN A28b 14B T 6 1 CN1 0034 HI00162 push button switch 2 paragraphs 6p PS 22E8552L 1 SW2 0035 HC00392 balance MIC jack RS JY 5030 030G 180 1 MIC2 0036 HC00582 balance MIC jac...

Страница 24: ...amic capacitor 0603 470PF 50V NPO 5 4 C8 C10 C11 C13 0025 CI00075 SMD ceramic capacitor 0603 0 1uF 50V Y5V 80 20 28 C3 C4 C5 C6 C7 C15 C16 C17 C18 C19 C21 C28 C 29 C30 0026 CI00266 SMD ceramic capacit...

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