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SERVICE MANUAL
7 CHANNEL
POWER AMPLIFIER
GFA-7807
TABLE OF CONTENTS
Introduction . . . . . . . . . . . . . . . . 1
Test Procedures . . . . . . . . . . . . . 1
Parts List . . . . . . . . . . . . . . . . . . 2
Voltage Conversion . . . . . . . . . . . . 5
PCB Layouts. . . . . . . . . . . . . . . . . . 7
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
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Summary of Contents for Adcom GFA-7807
- Page 1 SERVICE MANUAL 7 CHANNEL POWER AMPLIFIER GFA-7807 TABLE OF CONTENTS Introduction ....1 Test Procedures ... . . 1 Parts List .
- Page 2 BE ACCESSIBLE ONCE ITS TOP COVER IS REMOVED. DO NOT ATTEMPT FAMILIARIZATION, INSPECTION, OR ANY PROCEDURE WHATSOEVER UNLESS YOU HAVE DISCONNECTED THE GFA-7807 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 GFA-7807 SERVICE PARTS LIST AMPLIFIER MODULE PCB SCHEMATIC ADCOM PART DESCRIPTION NUMBER LOCATION BR1, BR2 16007000 BRIDGE RECTIFIER KBU8J C01 ,C04 ,C13 12005090 CAPACITOR ELEC 10uF 25V C02 ,C03 ,C14 ,C15 12007800 CAPACITOR ELEC 5600uF 100V C05 ,C09 12006030 CAPACITOR ELEC 0.1uF 50V...
- Page 4 R61 ,R62 27001570 RESISTOR 32007000 THERMISTOR 85 DEG C 21005550 LM555 37007800 SWITCH 35007800 BIAS POT POWER SUPPLY PCB SCHEMATIC ADCOM PART DESCRIPTION NUMBER LOCATION 12005010 CAPACITOR ELEC 1000uF 25V 12005120 CAPACITOR ELEC 220uF 16V 12005620 CAPACITOR ELEC 10uF 16V 12001510 SPARK KILLER 0.01uF 400V...
- Page 5 SCHEMATIC ADCOM PART DESCRIPTION NUMBER LOCATION MAIN TRANSFORMER 7805 Multi Voltage MAIN TRANSFORMER 7807 Models FOOT FRONT PANEL HEATSINK POWER BUTTON POWER BUTTON FRAME DC FAN 12 VOLT 4 EA. TOP COVER...
- Page 6 GFA-7807 Voltage Conversion The GFA-7807 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. Remove the jumper 230 VAC at the Power supply board and insert 2 jumpers at 120 VAC for detail as figure 2.
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