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SERVICE MANUAL
2 CHANNEL
POWER AMPLIFIER
GFA-5002
TABLE OF CONTENTS
Introduction . . . . . . . . . . . . . . . . . .
Test Procedures . . . . . . . . . . . . . .
Parts List . . . . . . . . . . . . . . . . . . . .
Voltage Conversion . . . . . . . . . . . . 6
Specifications . . . . . . . . . . . . . . . . 7
PCB Layout . . . . . . . . . . . . . . . . . .
Wiring Diagram . . . . . . . . . . . . . . .
Schematic . . . . . . . . . . . . . . . . . . .10
10 Timber Lane
Marlboro, NJ 07746
USA
Tel: 732-683-2356
Fax: 732-683-9790
Web: http://www.adcom.com
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Summary of Contents for Adcom GFA-5002
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Page 1: Table Of Contents
SERVICE MANUAL 2 CHANNEL POWER AMPLIFIER GFA-5002 TABLE OF CONTENTS Introduction ....Test Procedures .... -
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-5002 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-5002 SERVICE PARTS LIST Amplifier PCB AF705514 and AF705524 Schematic Part Number Description Location C603, C604 12001260 Capacitor 2.2µF 100V C607, C608 12001400 Capacitor 1µF 100V C609, C610 12005470 Capacitor 47µF 100V Electrolytic C611, C612 12001420 Capacitor 22pF 125V C613, C614... - Page 4 R625,R626 27004330 Resistor 5.62KΩ 1%MF Schematic Part Number Description Location R627,R628 27004225 Resistor 475Ω 1%MF R629,R630 27004420 Resistor 33.2Ω 1%MF R631,R632 27004260 Resistor 2.74KΩ 1%MF R633,R634 27004540 Resistor 499Ω 1%MF R635-R638 27004235 Resistor 68.1Ω 1%MF R639-R642 27004320 Resistor 47.5Ω 1%MF R643-R650 27004170 Resistor...
- Page 5 D905 16004003 Diode 1N4003 F902 19009100 Fuse 1A 250V Schematic Part Number Description Location IC701,IC702 21004558 Dual Op-Amp NJM4558DD IC703 21005550 Timer IC NJM555D IC801 21001237 Protect IC UPC1237H IC901 21007912 Regulator IC NJM7912 IC902 21007800 Regulator IC NJM7812 PT902 24005002 Standby Transformer TT-345-U...
- Page 6 JP701 22001570 DC Trigger Input Jack YK-5103A SW901 37005006 Ground Switch SS004-P022 Other Hardware Schematic Part Number Description Location 30005002 Speaker Binding Post 4TR-3357 19000500 Fuse - 115V Models (U.S.) 5A 125V 19008250 Fuse - 230V Models (Euro) 2.5A 250V 24005003 Transformer TT-342-U...
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Page 7: Voltage Conversion
GFA-5002 Voltage Conversion 115V to 230V 1) Unplug the power cord and remove the top cover. 2) Locate the standby transformer, PT902, on the circuit board in the middle of the unit. 3) Near PT902, cut jumpers J1, J2, J4, J5 - see figure 1 below. -
Page 8: Specifications
GFA-5002 SPECIFICATIONS Power Rating (To FTC Requirements) 50 watts continuous average power per channel into 8 ohms at any frequency between 20Hz to 20kHz with all channels driven at less than 0.05% THD 75 watts continuous average power per channel into 4 ohms at any frequency between 20Hz to 20kHz with all channels driven at less than 0.05% THD...