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SERVICE MANUAL
2 CHANNEL
POWER AMPLIFIER
GFA-5400
TABLE OF CONTENTS
Introduction . . . . . . . . . . . . . . . . 1
Version 1 vs. Version 2 . . . . . . . . 1
Test Procedures . . . . . . . . . . . . . 1
Parts List . . . . . . . . . . . . . . . . . . 2
Specifications . . . . . . . . . . . . . . . 6
Chassis Layout . . . . . . . . . . . . . . . 7
Version 1 Schematic . . . . . . . . . . 8
Version 2 Schematic . . . . . . . . . . 9
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-5400
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Page 1: Table Of Contents
SERVICE MANUAL 2 CHANNEL POWER AMPLIFIER GFA-5400 TABLE OF CONTENTS Introduction ....1 Version 1 vs. Version 2 ..1 Test Procedures . -
Page 2: Introduction
There are 2 versions of the GFA-5400 amplifier. The primary difference between the original version 1 and the updated version 2 is the addition of the ADCOM output protection circuit in version 2. This circuit can be noted by comparing the schematics of both versions in this manual. The protection circuit in... -
Page 3: Parts List
35mV L SPKR + L SPKR - VR601 DC Voltmeter R SPKR + R SPKR - VR602 reads 0mV GFA-5400 SERVICE PARTS LIST Power Supply PCB AF608615 SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION C901-C904 12005565 CAPACITOR ELECTROLYTIC 12000uF 63V... - Page 4 SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION Q609,Q610 33009610 POWER TRANSISTOR IRF9610 Q611,Q612 33002100 TRANSISTOR IRFD210 Q613,Q614 33000610 POWER TRANSISTOR IRF610 Q615-Q620 33002400 *(See Note 1) POWER TRANSISTOR IRFP240 Q621-Q626 33000924 *(See Note 1) POWER TRANSISTOR IRFP9240 Q627-Q630 33001016 TRANSISTOR 2SA1016G...
- Page 5 Power Switch PCB AF608645 SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION C921 12005700 SPARK KILLER 4700pF KC472M C922 12001605 MOV (120V operation) TNR12G241K C922 12001615 MOV (240V operation) TNR12G431K PW901 37001325 POWER SWITCH TH903 31002512 THERMISTOR SCK2R512 Protection Circuit Power Supply PCB...
- Page 6 PARTS EXCLUSIVE TO VERSION ONE OF THE GFA-5400 (VERSION WITHOUT STANDBY POWER SUPPLY AND LM 555 PROTECTION CIRCUITRY) SCHEMATIC ADCOM PART NUMBER DESCRIPTION LOCATION D605,D606 16000082 DIODE 8.2V ZENER R615,R616 27004300 RESISTOR R621,R622 27004200 RESISTOR PJ1,PJ2 22001370 INPUT JACK, Board Mount...
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Page 7: Specifications
GFA-5400 SPECIFICATIONS Power Rating (To FTC 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 0.18% THD 200 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...