Adcom GFA-5500 Service Manual
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Adcom GFA-5500 Service Manual

2 channel power amplifier
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See also: Owner's Manual
SERVICE MANUAL
2 CHANNEL
POWER AMPLIFIER
GFA-5500
Introduction . . . . . . . . . . . . . . . . 1
Schematic . . . . . . . . . . . . . . . . . 9

TABLE OF CONTENTS

Test Procedures . . . . . . . . . . . . . 1
Parts List . . . . . . . . . . . . . . . . . . 2
Specifications . . . . . . . . . . . . . . . 5
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-5500

  • Page 1 SERVICE MANUAL 2 CHANNEL POWER AMPLIFIER GFA-5500 TABLE OF CONTENTS Introduction ....1 Test Procedures ... . . 1 Parts List .
  • Page 2 This service manual is intended to assist trained and qualified technical personnel in verifying the performance of, adjusting, and repairing the ADCOM GFA-5500 amplifier. The procedures described here are not intended for persons unfamiliar with the appropriate safety and test procedures.
  • Page 3 GFA-5500 SERVICE PARTS LIST AMPLIFIER MODULE PCB SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION 12001535 CAPACITOR MICA 390pF 100V 12001080 CAPACITOR MYLAR 2.2uF 100V 12005280 CAPACITOR ELEC 47Uf 50V 12001085 CAPACITOR MYLAR 0.22uF 100V 12001480 CAPACITOR SILVER MICA 15pF 500V 12001470...
  • Page 4 27002030 RESISTOR ROED 10K (1/4W 1%) TB101 32006000 THERMAL BREAKER Z01-Z08 16000082 DIODE ZENER 8.2V (1/2W) POWER SUPPLY PCB SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION BR1,BR2 16003506 BRIDGE RECTIFIER 600V 35A DB3506/T 12001235 CAPACITOR MYLAR 0.1uF 250V C10,C11 12005525 CAPACITOR ELEC...
  • Page 5 SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION 30005800 BINDING POST RED/BLACK 12001235 CAPACITOR MYLAR 0.1uF 250V 27001000 RESISTOR 4.7R (2W 5% MOF) OTHERS SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION 12001510 SPARK KILLER 0.01uF 400V 19001200 MAIN FUSE 12A 250V 33005800 THERMISTOR...
  • Page 6 GFA-5500 Voltage Conversion The GFA-5500 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. Internally, their are two differences.
  • 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. Change the rear panel AC fuse from 6A to 12A, AGC. Place a sticker on the rear panel at the fuse holder to show the new value fuse (12A) and new value operating voltage (120VAC).
  • Page 8 GFA-5500 SPECIFICATIONS Power Rating (To FTC Requirements) 200 watts continuous average power per channel into 8 ohms at any frequency between 20Hz to 20kHz with all channels driven at less than 0.18% THD 350 watts continuous average power per channel into 4 ohms at any frequency between 20Hz to 20kHz with all channels driven at less than 0.18% THD...

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