Download
Share
Print this page
Adcom GFA-7605 Service Manual
  1. Manuals
  2. Brands
  3. Adcom Manuals
  4. Amplifier
  5. GFA-7605
  6. Service manual
Adcom GFA-7605 Service Manual

Adcom GFA-7605 Service Manual

5 channel power amplifier
Hide thumbs Also See for GFA-7605:
1
2
3
4
5
6
7
8
9

Advertisement

Quick Links

See also: Owner's Manual
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

Advertisement

loading

Related Manuals for Adcom GFA-7605

Summary of Contents for Adcom GFA-7605

  • Page 1: Table Of Contents

    SERVICE MANUAL 5 CHANNEL POWER AMPLIFIER GFA-7605 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-7605 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-7605 SERVICE PARTS LIST AMPLIFIER MODULE PCB SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION BRIDGE RECTIFIER SBU8G CAPACITOR POLY FILM 2.2uF 100V CAPACITOR POLY FILM 330pF 100V CAPACITOR ELEC 100uF 63V CAPACITOR MYLAR FILM 1uF 100V CAPACITOR SILVER MICA 33pF 100V CAPACITOR POLY FILM 4.7nF 100V...
  • Page 4 SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION RESISTOR RESISTOR 4.99K RESISTOR 4.99K RESISTOR 49.9K RESISTOR RESISTOR 22.1 RESISTOR RESISTOR RESISTOR 22.1 RESISTOR 4.99K RESISTOR 1.78K RESISTOR 49.9K RESISTOR 4.99K RESISTOR RESISTOR RESISTOR 5.6K 1/2W RESISTOR 4.99K RESISTOR RESISTOR RESISTOR 37.4 RESISTOR 37.4...
  • Page 5 POWER SUPPLY PCB SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION CAPACITOR ELEC 1000uF 25V SPARK KILLER CAPACITOR ELEC 220uF 16V D1-D6 DIODE 1N4004 MAIN FUSE STANDBY FUSE TURN-ON RELAY LED1 POWER LED LTL1204 (RED) TRANSISTOR MPSA13 RESISTOR 1K 1W RESISTOR 3.32K...

  • Page 6: Voltage Conversion

    GFA-7605 Voltage Conversion The GFA-7605 amplifier is produced in both a 120VAC only version and a multivoltage (120VAC or 230VAC convertible) version. The version can usually be distinguished by external inspection. The 120VAC only version has a fixed AC line cord. The convertible version has a detachable line cord.
  • Page 7 230V to 120V 1. Unplug the amplifier and remove the top cover. 2. Locate the connecting block mounted next to the power switch. 3. Move the transformer leads so they are configured as shown in figure 2. 4. Add heavy gauge wire between screw down portion of terminals as shown. 4.

  • Page 8: Specifications

    GFA-7605 SPECIFICATIONS Power Rating (To EIA/CEA-490-A Requirements) 125 watts continuous average power per channel into 8 ohms at any frequency between 20Hz to 20kHz with all channels driven at less than 1.00% 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 1.00% THD...