Adcom GFA-7400 Service Manual
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Adcom GFA-7400 Service Manual

Adcom GFA-7400 Service Manual

5 channel power amplifier
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Table of Contents

SERVICE MANUAL
5 CHANNEL
POWER AMPLIFIER
GFA-7400
TABLE OF CONTENTS
Introduction . . . . . . . . . . . . . . . . 1
Test Procedures . . . . . . . . . . . . . 1
Parts List . . . . . . . . . . . . . . . . . . 2
Specifications . . . . . . . . . . . . . . . 5
Schematic . . . . . . . . . . . . . . . . .
8551 E. Anderson dr.
Suite 105
Scottsdale,AZ 85525
USA
Tel: 480-607-2277
Fax: 480-348-9876

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Summary of Contents for Adcom GFA-7400

  • Page 1 SERVICE MANUAL 5 CHANNEL POWER AMPLIFIER GFA-7400 TABLE OF CONTENTS Introduction ....1 Test Procedures ... . . 1 Parts List .

  • Page 2: Introduction

    BE ACCESSIBLE ONCE ITS TOP COVER IS REMOVED. DO NOT ATTEMPT FAMILIARIZATION, INSPECTION, OR ANY PROCEDURE WHATSOEVER UNLESS YOU HAVE DISCONNECTED THE GFA-7400 FROM THE WALL AC OUTLET OR OTHER SOURCE OF AC POWER AND THE POWER- SUPPLY CAPACITORS ARE COMPLETELY DISCHARGED. THESE INSTRUCTIONS ARE PROVIDED FOR USE ONLY BY COMPETENT TECHNICAL PERSONNEL.

  • Page 3: Parts List

    GFA-7400 SERVICE PARTS LIST AMPLIFIER MODULE PCB SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION 16007000 BRIDGE RECTIFIER SBU8G 12001075 CAPACITOR POLY FILM 2.2uF 100V 12001390 CAPACITOR POLY FILM 330pF 100V 12005295 CAPACITOR ELEC 100uF 63V 12001400 CAPACITOR MYLAR FILM 1uF 100V...
  • Page 4 33000042 TRANSISTOR MPSA42 SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION 27004050 RESISTOR 27004135 RESISTOR 4.99K 27004135 RESISTOR 4.99K 27004500 RESISTOR 49.9K 27004050 RESISTOR 27004610 RESISTOR 22.1 27003420 RESISTOR 27003425 RESISTOR 27004610 RESISTOR 22.1 27004135 RESISTOR 4.99K 27004310 RESISTOR 1.78K 27004500 RESISTOR 49.9K...
  • Page 5 POWER SUPPLY PCB SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION 12005010 CAPACITOR ELEC 1000uF 25V 12001510 SPARK KILLER 12005120 CAPACITOR ELEC 220uF 16V D1-D6 16004004 DIODE 1N4004 19001200 MAIN FUSE 19000100 STANDBY FUSE 28007400 TURN-ON RELAY LED1 16001245 POWER LED LTL1204 (RED)

  • Page 6: Specifications

    GFA-7400 SPECIFICATIONS Power Rating (To FTC Requirements) 100 watts continuous average power per channel into 8 ohms at any frequency between 20Hz to 20kHz with all channels driven at less than 0.075% THD 150 watts continuous average power per channel into 4 ohms at any frequency between 20Hz to 20kHz with all channels driven at less than 0.075% THD...

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