Adcom-GFA5200-pwr-sm维修电路原理图.pdf

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1、 SERVICE MANUAL 2 CHANNEL POWER AMPLIFIER GFA-5200 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: http:/ RadioFans.CN 收音机爱 好者资料库1 INTRODUCTION This service manual is intende

3、d to assist trained and qualified technical personnel in verifying the performance of, adjusting, and repairing the ADCOM GFA-5200 amplifier. The procedures described here are not intended for persons unfamiliar with the appropriate safety and test procedures. TEST PROCEDURES All tests are performed

4、 with 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

5、 by comparing 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

6、SQUARE 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 performi

7、ng BIAS ALIGNMENT turn unit on and allow to idle with rated output (8 ohm) for approximately 5 MINUTES before attempting adjustments Step CouplingAdjustAdjust ForPlus LeadMinus Lead1R035R035R038DC Voltmeter2R135R135R138reads 20mV3L SPKR +L SPKR -R039DC Voltmeter4R SPKR +R SPKR -R139reads 0mV GFA-530

8、0 SERVICE PARTS LIST WARNING THERE ARE POTENTIALLY LETHAL VOLTAGES WITHIN THE GFA-5200 AMPLIFIER WHICH WILL BE ACCESSIBLE ONCE ITS TOP COVER IS REMOVED. DO NOT ATTEMPT FAMILIARIZATION, INSPECTION, OR ANY PROCEDURE WHATSOEVER UNLESS YOU HAVE DISCONNECTED THE GFA-5200 FROM THE WALL AC OUTLET OR OTHER

9、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-5200 UNLESS YOU ARE TECHNICALLY QUALIFIED TO DO SO. IMPORTANT BEFORE PROCEEDING WITH ADJUSTM

10、ENTS, MAKE SURE AMPLIFIER IS AT ROOM TEMPERATURE. RadioFans.CN 收音机爱 好者资料库2 AMPLIFIER AND POWER SUPPLY PCB FOR RIGHT CHANNEL REPLACE 0XX WITH 1XX SCHMATIC ADCOM PART NUMBER DESCRIPTION LOCATION C001 12005385 CAPACITOR ELEC 47uF 63V C002 12001415 CAPACITOR POLY 39pF 50V C004 12001275 CAPACITOR MYLAR 2

11、.2uF 250v C005 12005325 CAPACITOR ELEC 4.7uF 50V C006 12001425 CAPACITOR POLY 390pF 50V C007 12005385 CAPACITOR ELEC 47uF 63V C008 12001205 CAPACITOR MYLAR 1uF 250V C010 XXXXXX CAPACITOR CTC 18pF C011 12001235 CAPACITOR MYLAR 0.1uF 250V C012 12005385 CAPACITOR ELEC 47uF 63V C013 12002155 CAPACITOR C

12、ERAMIC 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,C019 12001305 CAPACITOR MYLAR 0.22uF 250V C020,C021 12005055 CAPACITOR ELEC 470uF 63V C022,C023 12005005 CAPACITOR ELEC 100

13、00uF 63V C024,C025 12001235 CAPACITOR MYLAR 0.1uF 250V C026,C027 12005010 CAPACITOR ELEC 1000uF 25V C028 12002030 CAPACITOR CERAMIC 5pF 50V D001-D005 16000082 DIODE ZENER 8.2V D006,D007 16000082 DIODE ZENER 8.2V D008,D009 16004148 DIODE 1N4148 D010 16001204 DIODE LTL1204 (RED) D011 16001254 DIODE LT

14、L1254 (YELLOW) D012 16004003 DIODE 1N4003 D014-D017 16004003 DIODE 1N4003 D018 16005200 BRIDGE RECTIFIER KBPC2504 D058 16003600 DIODE ZENER 3.6V M001,M002 19009400 FUSE GMA-4A M006 32005200 THERMAL BREAKER UP72 85 DEGREE Q001,Q002 33000992 TRANSISTOR 2SA992 Q003 33009210 TRANSISTOR IRFD9210 Q004 330

15、01845 TRANSISTOR 2SC1845 Q005 33000992 TRANSISTOR 2SA992 Q006 33009610 TRANSISTOR IRF9610 Q007-Q009 33002100 TRANSISTOR IRFD210 Q011,Q012 33000610 TRANSISTOR IRF610 Q013 33002400 TRANSISTOR IRFP240 Q014 33000924 TRANSISTOR IRFP9240 Q015-Q017 33001845 TRANSISTOR 2SC1845 Q018 33000992 TRANSISTOR 2SA99

16、2 Q021 33008050 TRANSISTOR KTC8050 Q022 33008550 TRANSISTOR KTC8550 R003 27004620 RESISTOR 7.5K (1/4W 1% M.F.) R004 27001515 RESISTOR 4.75R (1% 1/4W ROED) R005 27004265 RESISTOR 2.2K (1/4W 1% M.F.) SCHMATIC ADCOM PART NUMBER DESCRIPTION LOCATION RadioFans.CN 收音机爱 好者资料库3 R006 27004640 RESISTOR 1.5K R

17、007 27004670 RESISTOR 100R R008 27004570 RESISTOR 221R R010,R012 27004200 RESISTOR 10K R013 27004570 RESISTOR 221R R014 27004300 RESISTOR 15K R015 27004110 RESISTOR 2K R016 27004135 RESISTOR 4.99K 1/2W R017 27004570 RESISTOR 221R R018 27004400 RESISTOR 1.82K R019 27004600 RESISTOR 4.75K R020,R021 27

18、004500 RESISTOR 49.9K R022 27004200 RESISTOR 10K R023 27004400 RESISTOR 1.82K R024 27004600 RESISTOR 4.75K R026,R027 27004570 RESISTOR 221R R028 27003200 RESISTOR 5.1R 2W R030 27004225 RESISTOR 475R R031 27004670 RESISTOR 100R R034 27004570 RESISTOR 221R R035,R036 27006095 RESISTOR 0.33R 3W R037 270

19、04570 RESISTOR 221R R038 35001355 BIAS VR 5K R039 35001355 DC OFFSET VR 5K R041 27001480 RESISTOR 5.6K 2W R042 27004500 RESISTOR 49.9K R043,R044 27004570 RESISTOR 221R R045,R046 27004670 RESISTOR 100R R047 27004200 RESISTOR 10K R048,R049 XXXXXX RESISTOR 56R R050 27004160 RESISTOR 47.5K R051 27004050

20、 RESISTOR 1K R052 27004435 RESISTOR 22R R053 27004500 RESISTOR 49.9K R054 27004200 RESISTOR 10K R055 27004265 RESISTOR 2.2K R056 27004630 RESISTOR 220K R057 27004050 RESISTOR 1K R058 27004071 RESISTOR 5.1K R059 27001160 RESISTOR 33K R060 27004500 RESISTOR 49.9K R061,R062 27003280 RESISTOR 8.2K 1W R0

21、63,R064 27003010 RESISTOR 10R 1/2W R065,R066 27004071 RESISTOR 5.1K R067,R068 27003010 RESISTOR 10R 1/2W R140 27003300 RESISTOR 10R 2W U001 21005550 IC LM555 22001380 JACK RCA INPUT GOLD STANDBY POWER SUPPLY PCB RadioFans.CN 收音机爱 好者资料库4 SCHMATIC ADCOM PART NUMBER DESCRIPTION LOCATION C201 12005700 S

22、PARK KILLER 4700pF 400V C202 12005010 CAPACITOR ELEC 1000uF 25V C203 12005120 CAPACITOR ELEC 220uF 16V D201-D205 16004003 DIODE 1N4003 D302 16001204 POWER LED LTL1204 (RED) M204 37005200 POWER SWITCH SDDFA3066A NR201 31005200 THERMISTOR 5R/8A U201 21007812 REGULATOR IC 7812 V201 EURO 12001610 VARIST

23、OR TNR9G391K V201 USA 12001230 VARISTOR TNR9G221K OTHERS SCHMATIC ADCOM PART NUMBER DESCRIPTION LOCATION T1 24005200 MAIN TRANSFORMER 1806-2116-2 T2 24005201 STANDBY TRANSFORMER 1806-2196-0 M201 EURO 19000250 MAIN FUSE 2.5A 250V M201 USA 19000500 MAIN FUSE 5A 125V M202 EURO 19009050 STANDBY FUSE T.5

24、A 250V M202 USA 19009050 STANDBY FUSE T.5A 250V 13005201 FRONT PANEL 13005200 TOP COVER 13005204 HEAT SINK 13005205 HEAT SINK EXTENSION 47002580 LED HOLDER 13005206 FOOT 15001050 POWER CHORD 11001155 POWER BUTTON 11001165 POWER BUTTON FRAME 20005300 MAIN FUSE HOLDER RadioFans.CN 收音机爱 好者资料库5 GFA-5200

25、 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 0.18% THD 80 watts continuous average power per channel into 4 ohms at any frequency between 20Hz to 20kHz with al

26、l channels driven at less than 0.18% THD IM Distortion (SMPTE) 1 watt to 50 watts into 8 ohms. 0.07% 1 watt to 80 watts into 4 ohms. 0.07% IM Distortion (CCIF, Any Combination from 4kHz to 20kHz) 50 watts into 8 ohms. 0.035% 80 watts into 4 ohms. 0.035% THD + Noise at 50 watts into 8 ohms (Typical)

27、20Hz. 0.018% 1kHz. 0.02% 10kHz. 0.07% 20kHz. 0.14% THD + Noise at 80 watts into 4 ohms (Typical) 20Hz. 0.018% 1kHz. 0.02% 10kHz. 0.08% 20kHz. 0.165% Frequency Response 1 Watt into 8 ohms (10Hz to 20kHz). +0, -0.25dB Power Bandwidth (-3dB). 3Hz to 130kHz Dynamic Headroom into 4 ohms. 2.2 dB Signal to

28、 Noise Ratio, “A” Weighted (50 watts into 8 ohms). 98dB Gain. 29dB Input Sensitivity for 1 Watt. 0.1 volts for 50 Watts. 0.71 volts Input Impedance . 49.9k Damping Factor (20Hz to 20kHz). 260 Rise Time (5kHz, 90V, peak-to-peak square wave, 20% to 80%). 1.1S Power Consumption (Continuous, All Channel

29、s Driven) Quiescent. 50VA Maximum. 600VA 50 watts into 8 ohms. 325VA 80 watts into 4 ohms. 480VA Power (Available in 230VAC on special order). 115VAC - 50/60Hz Chassis Dimensions. 3” (72mm) x 17” (432mm) x 11 3/8” (289mm) Maximum Dimensions. 3 1/4” (83mm) x 17” (432mm) x 12 1/8” (308mm) Weight. 17 lb. (7.7 kg) Weight, Packed . 22 lb. (10.0 kg) RadioFans.CN 收音机爱 好者资料库