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SERVICE MANUAL

 

  

5 CHANNEL 

POWER AMPLIFIER

 

GFA-7605

 

 

TABLE OF CONTENTS 

 

Introduction . . . . . . . . . . . . . . . . 1 

                  Test Procedures . . . . . . . . . . . . . 1 
                  Parts List . . . . . . . . . . . . . . . . . . 2 
                  Voltage Conversion . . . . . . . . . . . .  5 
                  Specifications . . . . . . . . . . . . . . . 7 
                                    PCB Layouts. . . . . . . . . . . . . . . . . . 8 
                  Schematic . . . . . . . . . . . . . . . . . 9 
                                   

 

 

8551 East Anderson Drive,Suite 105 

Scottsdale, Arizona 85255 

USA 

Tel: 480-607-2277 

Fax: 480-348-9876 

 

Web: http://www.adcom.com 

Summary of Contents for GFA-7605

Page 1: ...TABLE OF CONTENTS Introduction 1 Test Procedures 1 Parts List 2 Voltage Conversion 5 Specifications 7 PCB Layouts 8 Schematic 9 8551 East Anderson Drive Suite 105 Scottsdale Arizona 85255 USA Tel 480...

Page 2: ...LONGEVITY OF THE AMPLIFIER BIAS ALIGNMENT The component references are the same for all channels Operate the amplifier without load or input connection for this adjustment 1 Turn the amplifier on and...

Page 3: ...F 100V C17 CAPACITOR ELEC 22uF 35V C18 CAPACITOR ELEC 10000uF 63WV C19 CAPACITOR ELEC 10000uF 63WV C20 CAPACITOR MYLAR 0 22uF C21 CAPACITOR MYLAR 0 22uF C22 CAPACITOR ELEC 100uF 16V C23 CAPACITOR ELEC...

Page 4: ...8 RESISTOR 100 R19 RESISTOR 475 R20 RESISTOR 37 4 R21 RESISTOR 37 4 R22 RESISTOR 75 R23 RESISTOR 2 74K R24 RESISTOR 1K R26 RESISTOR 392 R27 RESISTOR 392 R28 RESISTOR 10 R29 RESISTOR 49 9 R30 RESISTOR...

Page 5: ...N RELAY LED1 POWER LED LTL1204 RED Q1 TRANSISTOR MPSA13 R1 RESISTOR 1K 1W R2 RESISTOR 3 32K R3 RESISTOR 10K R4 RESISTOR 3 32K T1 STANDBY TRANSFORMER TH1 THERMISTOR CL100 U2 REGULATOR IC 7812 POWER SWI...

Page 6: ...tch is different in both versions In the multivoltage unit this connecting block has 5 pair of mounting leads as is shown in the figures below In the 120VAC only version the connecting block has only...

Page 7: ...shown in figure 2 4 Add heavy gauge wire between screw down portion of terminals as shown 4 Change the rear panel AC fuse from 6A to 12A AGC Place a sticker on the rear panel at the fuse holder to sho...

Page 8: ...1kHz 0 0012 10kHz 0 02 20kHz 0 025 THD Noise at 150 watts into 4 ohms Typical 20Hz 0 025 1kHz 0 025 10kHz 0 035 20kHz 0 045 Frequency Response 1 Watt into 8 ohms 10Hz to 20kHz 0 0 25dB Power Bandwidth...

Page 9: ...8...

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