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1、 SERVICE MANUAL 2 CHANNEL POWER AMPLIFIER GFA-5300 TABLE OF CONTENTS Introduction . . . . . . . . . . . . . . . . 1 Test Procedures . . . . . . . . . . . . . 1 Parts List . . . . . . . . . . . . . . . . . . 2 Specifications . . . . . . . . . . . . . . . 5 Chassis Layout . . . . . . . . . . . . . . .
2、 5 PCB Layout . . . . . . . . . . . . . . . . . . 7 Wiring Diagram. . . . . . . . . . . . . . . . 8 Schematic . . . . . . . . . . . . . . . . . 9 10 Timber Lane Marlboro, NJ 07746 USA Tel: 732-683-2356 Fax: 732-683-9790 Web: RadioFans.CN 收音机爱 好者资料库 1 INTRODUCTION This service manual is intended to a
3、ssist trained and qualified technical personnel in verifying the performance of, adjusting, and repairing the ADCOM GFA-5300 amplifier. The procedures described here are not intended for persons unfamiliar with the appropriate safety and test procedures. TEST PROCEDURES All tests are performed with
4、a 115V, low-distortion (less than 2% THD), AC-power source, 8-ohm resistive load (except slew rate), and a signal source of not more than 600 ohms. An 80kHz low-pass filter is employed during THD distortion measurements. Signal-to-noise measurements are “A” weighted. Damping factor is measured by co
5、mparing the 1 watt output voltage with and without an 8 ohm load. Slew rate is measured with an inductive load, and is derived with a dual-time-based oscilloscope reading the slope of a full power 5kHz square wave. DO NOT OPERATE THE AMPLIFIER AT FULL-POWER SINE WAVE ABOVE 22kHz OR FULL-POWER SQUARE
6、 WAVE ABOVE 5kHz. CORRECT BIAS ADJUSTMENT IS CRITICAL TO THE PERFORMANCE OF THIS AMPLIFIER. MAXIMUM OUTPUT POWER, MINIMUM THD AND HEAT DISSIPATION ARE AFFECTED BY THE BIAS SETTING AND MUST BE CORRECT TO MAINTAIN THE SONIC QUALITY AND LONGEVITY OF THE AMPLIFIER. BIAS ALIGNMENT Prior to performing BIA
7、S ALIGNMENT turn unit on and allow to idle with rated output (8 ohm) for approximately 5 MINUTES before attempting adjustments Bias Adjustment Connect voltmeter across emitter resister R038 (R138 for right channel) and adjust R043 (R143 for right channel) to read 20mV +/-2mV DC Offset Connect voltme
8、ter across the speaker outputs and adjust R042 (R142 for right channel) to read 0mV +/- 10mV WARNING THERE ARE POTENTIALLY LETHAL VOLTAGES WITHIN THE GFA-5300 AMPLIFIER WHICH WILL BE ACCESSIBLE ONCE ITS TOP COVER IS REMOVED. DO NOT ATTEMPT FAMILIARIZATION, INSPECTION, OR ANY PROCEDURE WHATSOEVER UNL
9、ESS YOU HAVE DISCONNECTED THE GFA-5300 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. DO NOT UNDERTAKE ANY SERVICE PROCEDURES IN THE GFA-5300 UNLESS YOU ARE
10、TECHNICALLY QUALIFIED TO DO SO. IMPORTANT BEFORE PROCEEDING WITH ADJUSTMENTS, MAKE SURE AMPLIFIER IS AT ROOM TEMPERATURE. RadioFans.CN 收音机爱 好者资料库 2 a GFA-5300 SERVICE PARTS LIST AMPLIFIER PCB FOR RIGHT CHANNEL REPLACE 0XX WITH 1XX SCHMATIC ADCOM PART NUMBER DESCRIPTION LOCATION C001 12005385 CAPACIT
11、OR ELEC 47uF 63V C002 12001415 CAPACITOR POLY 39pF 50V C004 12001275 CAPACITOR MYLAR 2.2uF 250v C005 12005325 CAPACITOR ELEC 4.7uF 50V C006 12001425 CAPACITOR POLY 390pF 50V C007 12005385 CAPACITOR ELEC 47uF 63V C008 120012025 CAPACITOR MYLAR 1uF 250V C010 XXXXXX CAPACITOR CTC 18pF C011 12001235 CAP
12、ACITOR MYLAR 0.1uF 250V C012 12005385 CAPACITOR ELEC 47uF 63V C013 12002155 CAPACITOR CEREMIC 0.1uF 50V C014 12005380 CAPACITOR ELEC 47uF 25V C015 12005090 CAPACITOR ELEC 10uF 25V C016 12001240 CAPACITOR MYLAR 0.01uF 50V C017 12005160 CAPACITOR ELEC 22uF 25V C018 12002030 CAPACITOR CEREMIC 5pF 50V C
13、019,C020 12001305 CAPACITOR MYLAR 0.22uF 250V C021,C022 XXXXX CAPACITOR ELEC 470uF 63V C023,C024 12005010 CAPACITOR ELEC 1000uF 25V D001-D005 16000082 DIODE ZENER 8.2V D006 16004148 DIODE 1N4148 D007,C008 16000082 DIODE ZENER 8.2V D009 16001254 DIODE LTL1254 (YELLOW) D010 16001204 DIODE LTL1204 (RED
14、) D011 16004148 DIODE 1N4148 D012-D016 16004003 DIODE 1N4003 D058 16003600 DIODE ZENER 3.6V M001,M002 19009400 FUSE T4A 125V M006 32005200 THERMAL BREAKER UP72 85 DEGREE Q001,Q002 33000992 TRANSISTOR 2SA992 Q003 33009210 TRANSISTOR IRFD9210 Q004 33001845 TRANSISTOR 2SC1845 Q005 33000992 TRANSISTOR 2
15、SA992 Q006 33009610 TRANSISTOR IRF9610 Q007-Q009 33002100 TRANSISTOR IRFD210 Q011,Q012 33000610 TRANSISTOR IRF610 Q013,Q015 33002400 TRANSISTOR IRFP240 Q014,Q016 33000924 TRANSISTOR IRFP9240 Q017-Q019 33001845 TRANSISTOR 2SC1845 Q020 33000992 TRANSISTOR 2SA992 Q021 33008050 TRANSISTOR KTC8050 Q022 3
16、3008550 TRANSISTOR KTC8550 R003 27004620 RESISTOR 7.5K R004 27001515 RESISTOR 4.7R R005 27004265 RESISTOR 2.2K R006 27004640 RESISTOR 1.5K 3 R007 27004670 RESISTOR 100R SCHMATIC ADCOM PART NUMBER DESCRIPTION LOCATION R008 27004570 RESISTOR 221R R010,R012 27004200 RESISTOR 10K R013 27004570 RESISTOR
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