QSC-Series3-pwr-sm 维修电路原理图.pdf

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1、 Series III Power Amplifiers TECHNICAL SERVICE MANUAL ? 3800 REV. B *TD-300001-AX* ? 3500 ? 3350 ? 3200 RadioFans.CN 收音机爱 好者资料库 2 SERVICE MANUAL Series Three Power Amplifiers QSC Audio Products Inc. Technical Services Group Toll Free: 800-772-2834 Local: 714-957-7150 Fax: 714-754-6173 QSC Audio Prod

2、ucts, Inc. 1675 MacArthur Blvd. Costa Mesa, CA 92626 tech_ RadioFans.CN 收音机爱 好者资料库 3 SERIES THREE POWER AMPLIFIERS 4Table of Contents Product Specifications 5 Model 3200 5 Model 3350 6 Model 3500 7 Model 3800 8 Series Three Parts Lists 9 3200 PCB ASSEMBLY 9 3350 PCB ASSEMBLY 11 3500 PCB ASSEMBLY 13

3、3800 MAIN NPN PCB ASSEMBLY 15 3800 MAIN PNP PCB ASSEMBLY 16 3800 GAIN PCB ASSEMBLY 17 Series Three Power Amplifiers 18 Circuit Description 18 Block Diagram 18 Detailed Explanations 18 Troubleshooting Chart 23 Introduction 23 1. Current Draw Section 23 2. Protection Circuit Problems 24 3. Faults With

4、 Signal Present 25 Series Three Test Procedures: 29 Model 3200 29 Model 3350 31 Model 3500 33 Model 3800 35 Series Three Schematics 37 Model3200 37 Model 3350 38 Model 3500 Early Version 39 Model 3500 Late Version 40 Model 3800 41 Series Three PCB Drawings 43 Model 3200 PCB 43 Model 3350 PCB 44 Mode

5、l 3800 46A PCB 45 Model 3800 47A PCB 46 Model 3800 48B PCB 47 Model 3800 Gain PCB 48 5Product Specifications Model 3200 OUTPUT POWER (per channel) Continuous Average Output Power both channels driven: 8 ohms, 20 Hz-20 kHz 0.1% THD 110 W 1 kHz 1% THD 135 W 4 ohms, 20 Hz-20 kHz 0.1% THD 140 W 1 kHz 1%

6、 THD 200 W 2 ohms, 1 kHz 1% THD NR Bridged Mono operation: 16 ohms, 20 Hz-20 kHz 0.1% THD 220 W 1 kHz 1% THD 270 W 8 ohms, 20 Hz-20 kHz 0.1% THD 280 W 1 kHz 1% THD 400 W 4 ohms, 1 kHz 1% THD NR Distortion: THD 20 Hz-20 kHz from 250 milliwatts to rated power shall be less than 0.1%, 0.015% typical. S

7、MPTE-IMD less than 0.020% 250 milliwatts to rated power. Frequency Response: 20 Hz-10 kHz 0.1 dB 8 Hz-300 kHz +0/-3 dB Damping Factor: Greater than 200 Dynamic Headroom: 3.0 dB at 8 Noise: -100 dB 20 Hz-20 kHz Sensitivity: 1V RMS for rated power (8 ) Input Impedance: 20 k Controls: Front Flush deten

8、ted gain control, recessed AC switch and AC circuit breaker for each channel. Rear Mono-bridging and accessory module switches. Indicators: Bi-color LED indicating DC power OK/Protect mode, LED clip indicator, -30 dB and -6 dB signal level indicators, flashing over-temp indicators. Connectors: XLR,

9、” (ring, tip, sleeve) and 3 terminal barrier strip inputs wired in parallel, 2-terminal barrier strip and 5-way binding post outputs wired in parallel, octal input sockets provided for input transformers or active accessories, ground lift terminal block. Cooling: Passive cooling combined with high e

10、fficiency output stage for reduced operating temperatures. Unique circuit configuration allows direct metal mounting of output devices for reduced thermal stress from short-term peaks. Amplifier Protection: Indefinite short circuit*, open circuit, over-temp, ultrasonic and RF protection. Stable into

11、 reactive and mismatched loads. Inputs protected from overload. All protection completely independent on each channel. *Output Averaging short circuit protection (U.S. Pat. 4,321.554) Load Protection: Individual channel Load Grounding output relays provide DC Fault, 3 second delayed turn on (transie

12、nt protection), and excessive low frequency protection, Instant turn-off, pop suppression and power interrupt protection is also provided. Output Circuit Type: Full complementary two-level high efficiency. Output Devices (total): 8 Power Supply: Two completely separate power supplies including AC sw

13、itches and AC circuit breakers; only AC cord is common. Power Requirements: 120 Volts, 60 Hz, 4.4 A Dimensions: Faceplate 19” 1.75” Depth (behind mtg, with rear support) 16.5” Depth (chassis) 14.6” Weight: Shipping (lbs.) 31 Net (lbs.) 26 6 Model 3350 OUTPUT POWER (per channel) Continuous Average Ou

14、tput Power both channels driven: 8 ohms, 20 Hz-20 kHz 0.1% THD 200 W 1 kHz 1% THD 260 W 4 ohms, 20 Hz-20 kHz 0.1% THD 300 W 1 kHz 1% THD 420 W 2 ohms, 1 kHz 1% THD 450 W Bridged Mono operation: 16 ohms, 20 Hz-20 kHz 0.1% THD 400 W 1 kHz 1% THD 520 W 8 ohms, 20 Hz-20 kHz 0.1% THD 600 W 1 kHz 1% THD 8

15、40 W 4 ohms, 1 kHz 1% THD 900 W Distortion: THD 20 Hz-20 kHz from 250 milliwatts to rated power shall be less than 0.1%, 0.015% typical. SMPTE-IMD less than 0.020% 250 milliwatts to rated power. Frequency Response: 20 Hz-10 kHz 0.1 dB 8 Hz-300 kHz +0/-3 dB Damping Factor: Greater than 200 Dynamic He

16、adroom: 3.0 dB at 4 ohms Noise: -100 dB 20 Hz-20 kHz Sensitivity: 1 V RMS for rated power (8 ) Input Impedance: 20 k balanced or unbalanced Controls: Front Flush detented gain control, recessed AC switch and AC circuit breaker for each channel. Rear Mono-bridging and accessory module switches. Indic

17、ators: Bi-color LED indicating DC power OK/Protect mode, LED clip indicator, -30 dB and -6 dB signal level indicators, flashing over-temp indicators. Connectors: XLR, ” (ring, tip, sleeve) and 3 terminal barrier strip inputs wired in parallel, 2-terminal barrier strip and 5-way binding post outputs

18、wired in parallel, octal input sockets provided for input transformers or active accessories, ground lift terminal block. Cooling: Passive cooling combined with high efficiency output stage for reduced operating temperatures. Unique circuit configuration allows direct metal mounting of output device

19、s for reduced thermal stress from short-term peaks. Amplifier Protection: Indefinite short circuit*, open circuit, over-temp, ultrasonic and RF protection. Stable into reactive and mismatched loads. Inputs protected from overload. All protection completely independent on each channel. *Output Averag

20、ing short circuit protection (U.S. Pat. 4,321.554) Load Protection: Individual channel Load Grounding output relays provide DC Fault, 3 second delayed turn on (transient protection), and excessive low frequency protection, Instant turn-off, pop suppression and power interrupt protection is also prov

21、ided. Output Circuit Type: Full complementary two-level high efficiency. Output Devices (total): 16 Power Supply: Two completely separate power supplies including AC switches and AC circuit breakers; only AC cord is common. Power Requirements: 120, 220, or 240 Volts, 50 Hz-60 Hz, 8 A (each channel)

22、Dimensions: Faceplate 19” 3.5” Depth (behind mtg, with rear support) 17.9” Depth (chassis) 15.9” Weight: Shipping (lbs.) 46 Net (lbs.) 41 7 Model 3500 OUTPUT POWER (per channel) Continuous Average Output Power both channels driven: 8 ohms, 20 Hz-20 kHz 0.1% THD 300 W 1 kHz 1% THD 350 W 4 ohms, 20 Hz

23、-20 kHz 0.1% THD 450 W 1 kHz 1% THD 560 W 2 ohms, 1 kHz 1% THD 700 W Bridged Mono operation: 16 ohms, 20 Hz-20 kHz 0.1% THD 600 W 1 kHz 1% THD 700 W 8 ohms, 20 Hz-20 kHz 0.1% THD 900 W 1 kHz 1% THD 1120 W 4 ohms, 1 kHz 1% THD 1400 W Distortion: THD 20 Hz-20 kHz from 250 milliwatts to rated power sha

24、ll be less than 0.1%, 0.015% typical. SMPTE-IMD less than 0.020% 250 milliwatts to rated power. Frequency Response: 20 Hz-10 kHz 0.1 dB 8 Hz-300 kHz +0/-3 dB Damping Factor: Greater than 200 Dynamic Headroom: 3.0 dB at 4 Noise: -100 dB 20 Hz-20 kHz Sensitivity: 1 V RMS for rated power (8 ) Input Imp

25、edance: 20 k balanced or unbalanced Controls: Front Flush detented gain control, recessed AC switch and AC circuit breaker for each channel. Rear Mono-bridging and accessory module switches. Indicators: Bi-color LED indicating DC power OK/Protect mode, LED clip indicator, -30 dB and -6 dB signal lev

26、el indicators, flashing over-temp indicators. Connectors: XLR, ” (ring, tip, sleeve) and 3 terminal barrier strip inputs wired in parallel, 2-terminal barrier strip and 5-way binding post outputs wired in parallel, octal input sockets provided for input transformers or active accessories, ground lif

27、t terminal block. Cooling: Passive cooling combined with high efficiency output stage for reduced operating temperatures. Unique circuit configuration allows direct metal mounting of output devices for reduced thermal stress from short-term peaks. Amplifier Protection: Indefinite short circuit*, ope

28、n circuit, over-temp, ultrasonic and RF protection. Stable into reactive and mismatched loads. Inputs protected from overload. All protection completely independent on each channel. *Output Averaging short circuit protection (U.S. Pat. 4,321.554) Load Protection: Individual channel Load Grounding ou

29、tput relays provide DC Fault, 3 second delayed turn on (transient protection), and excessive low frequency protection, Instant turn-off, pop suppression and power interrupt protection is also provided. Output Circuit Type: Full complementary two-level high efficiency. Output Devices (total): 24 Powe

30、r Supply: Two completely separate power supplies including AC switches and AC circuit breakers; only AC cord is common. Power Requirements: 120 Volts, 60Hz, 12 A Dimensions: Faceplate 19” 3.5” Depth (behind mtg, with rear support) 17.9” Depth (chassis) 15.9” Weight: Shipping (lbs.) 55 Net (lbs.) 50

31、8 Model 3800 OUTPUT POWER (per channel) Continuous Average Output Power both channels driven: 8 ohms, 20 Hz-20 kHz 0.1% THD 375 W 1 kHz 1% THD 440 W 4 ohms, 20 Hz-20 kHz 0.1% THD 600 W 1 kHz 1% THD 750 W 2 ohms, 20 Hz-20 kHz 0.2% THD 850 W 1 kHz 1% THD 1100 W Bridged Mono operation: 16 ohms, 20 Hz-2

32、0 kHz 0.1% THD 720 W 1 kHz 1% THD 880 W 8 ohms, 20 Hz-20 kHz 0.1% THD 1200 W 1 kHz 1% THD 1500 W 4 ohms, 20 Hz-20 kHz 0.2% THD 1700 W 1 kHz 1% THD 2200 W Distortion: THD 20 Hz-20 kHz at rated power shall be less than 0.1%. SMPTE-IMD less than 0.025% at rated power. Frequency Response: 20 Hz-10 kHz 0

33、.1 dB 8 Hz-300 kHz +0/-3 dB Damping Factor: Greater than 200 Dynamic Headroom: 2 dB at 4 Noise: -100 dB 20 Hz-20 kHz Sensitivity: 1 V RMS for rated power (8 ) Input Impedance: 20 k balanced or 10 k unbalanced Controls: Front Flush detented gain control, recessed AC switch and AC circuit breaker for

34、each channel. Rear Mono-bridging and accessory module switches. Indicators: Bi-color LED indicating DC power OK/Protect mode, LED clip indicator, -30 dB and 6 dB signal level indicators, flashing over-temp indicators. Cooling: Passive cooling combined with high efficiency output stage for 50% reduct

35、ion in dissipated heat. Unique circuit configuration provides direct-metal mounting of output devices to minimize short-term thermal excursions of power transistors. Fan-assisted cooling recommended for high duty cycles at 2 ohms. Amplifier Protection: Indefinite short circuit*, open circuit, over-t

36、emp, ultrasonic and RF protection. Stable into reactive and mismatched loads. Inputs protected from overload. *Output Averaging short circuit protection (U.S. Pat. 4,321.554) Load Protection: Individual channel output relays provide DC Fault, 3 second delayed turn-on (transient protection), and exce

37、ssive low-frequency protection. Instant turn-off, pop suppression and power interrupt protect is also provided. Output Circuit Type: Full complementary two-level high efficiency. Output Devices (total): 40 Power Supply: A complete separate power supply for each channel including AC switch/circuit br

38、eaker and AC cord. Power Requirements: 120, 220, or 240 Volts, 50 Hz-60 Hz, 13 A (each channel) Dimensions: Faceplate 19” 5.25” Depth (behind mtg, with rear support) 17.9” Depth (chassis) 15.9” Weight: Shipping (lbs.) 75 Net (lbs.) 83 9Series Three Parts Lists 3200 PCB ASSEMBLY WP-320038-PO3200 MAIN

39、 PCB ASSYWP-320038-PO3200 MAIN PCB ASSYPart NumberDescriptionReferencePart NumberDescriptionReferenceSC-062050-PP #6 X 5/16 P/P ZINCQ5, Q6,PL-903125-SP SPACER, ROUND, NYLON 0.047R14Q7, Q8PL-000220-MIQ1, Q2, SW-000010-RY MX1500/3500 24V OUTPUT RELAYD19, D20WC-0.6022-JW .6 JUMPER, WHITEJ3, J6, PL-9053

40、85-SP SPACER RND, NYL #6 0.385L B LD1, LD2,J7, J10LD3, LD4,WC-0.8022-JW .8 JUMPER, WHITEJ2, J11LD5WC-001102-SQ INSUL.SLEEVE QSC 1102,.6 CLRPTCPL-909235-SP HOLDER, LED, 90 DEGREES, NYLD1, LD2,WC-1.1022-JW 1.1 JUMPER WHITE 22GAJ4, J5LD3, LD4,XF-200010-RL INDUCTOR 2UH W/10 OHM AXILL1, L2LD5IC-005532-OP

41、 OP DUAL NE5532PT-110000-AT TRIM 100 OHMTR1LB-100003-SR ON SUBPANELPT-210000-AT 1K OHM TRIMPOTTR2, TR3LB-376002-MP ON SUBPANELQD-000134-LR LED RED T-1 3/4LD1, LD2MS-320310-HS HEAT SINKQD-000134-LX LED R/G T-1 3/4LD5MS-320372-SP SUBPANELQD-000134-LY LED YEL T-1 3/4LD3, LD4,PL-090751-RV RIVET, FASTEX

42、ON HEAT SINKSQD-0003.9-ZT ZENER 3.9V .25W DZ84073IDZ25PT-350000-AT 50K DET GAIN POTQD-0004.7-ZT ZENER 4.7V .25W DZ840731EZ24QD-050200-BX 5A 200V BRIDGE RECTIFIERB3, B4QD-0007.5-ZT ZENER 7.5V .25W DZ840731FZ26SC-061041-SP #6-32 X 1/4 SCREW SUBPANEL MTG.QD-000424-TX 2SD424 XSTOR NPN TO-3/TO-204AQ6, Q8

43、SC-062050-PP #6 X 5/16 P/P ZINC SUPBANEL MTGQD-000554-TX 2SB554 XSTOR PNP TO-3/TO-204AQ5, Q7SC-062081-PO #6X1/2 B P/P OVAL BLACK HEAT SINKS MTGQD-000810-DX DIOD 100V 8A 35NS MUR810D19, D20CA-033100-CM 33PF, 100V, 5%, MICAC2QD-001340-LR LED RED T-1 3/4 VREFLD6CA-147100-BD 470PF, 100V, 10%, DISKC11, C

44、12, QD-004004-DX DIODE RECT DO41 400V 1AD4, D7, C13, C14D8, CA-210100-BP .001UF, 100V, 10%, MYLARC1, C9, D9, D18C10, C15QD-004410-TX BJTN 80V .25A 1.5W 2N4410Q9, Q13,CA-222100-BP .0022UF,100V,10%,MYLARC3Q14CA-347050-BP .047UF, 50V, 10%, MYLARC7, C8QD-004744-ZA ZENER 15V, 1W, 5%, 1N4744AZ21, Z22CA-41

45、0100-BP .1UF, 100V, 10%, MYLARC5QD-004934-DX DIODE100V 1A 200NS VP 1N493D1, D2, CA-422100-CP .22UF, 100V, 5%, MYLARC4D3, D5,CA-610035-BE 10UF, 35V, ELEC., RADIALE7D6, D10,CA-647010-BN 47UF, 10V, 10% RADIAL,CAPLYTIE4D11, D13,CA-647035-BEE5D14. D16,CA-722010-BN 220UF 10V CAPACITORE6D17CA-722025-BE 220

46、UF, 25V, ELECT., RADIAE1, E2QD-008599-TX BJTP 60V .5A .625W MPS8599Q10 Q11, CA-747010-BE 470UF, 16V, ELEC., RADIAE3Q12, Q15CA-822080-BE 2200UF 80V ELEC. CAPACITORE8, E9, QD-015030-TMQ1, Q3E10, E11QD-015031-TMQ2, Q4CA-833050-BE 3300UF 50V CAPACITORE13, E14QD-1.5200-BX DIODE BRIDGE RECT 200V, 1.5A B1,

47、 B2CO-000008-IC SOCKET 100 8-PIN DIPRE-.27005-EM 2.7 2W 5% MOFPR32, R33CO-520258-MJ 6 COND. MOD JACKRE-.33005-DM 3.3 1W 5% MOFPR12, R13CO-641119-AH HDR 156 8-PIN RAMP LOCK PREFRE-.56005-BC 5.6 1/4W 5% CFR10HW-060080-PS #6-32 X 8 PEM STUDRE-000000-PT 90 C PTC RESISTORPTCMS-000006-TG IN ALL LOCATIONS

48、SHOWN AS GREASERE-000050-NR NTC THERMISTOR, 50 OHMR14MS-320311-HTRE-002205-DM 22 1W 5% MOFPR27, R28,NW-000220-RW TO-220 RECT. WASHERQ1, Q2, R29, R30D19, D20RE-010005-BC 100 1/4W 5% CFR11, R23,NW-060010-SL #6 SPLIT TOOTH LOCK WASHERQ1, Q2, R24, R47Q5, Q6, RE-015005-BC 150 1/4W 5% CFR43, R44Q7, D19,RE

49、-033201-BM 332 1/4W 1% MFR8D20, PTCRE-030005-NWR36NW-060400-HN #6-32 BY 1/4 HEX NUTQ1, Q2, RE-068005-EM 680 OHM,2 W,MET OX,5%,RESR34Q5, Q6,RE-082005-BC 820 1/4W 5% CFR21, R22Q7, D19,RE-110005-BC 1K 1/4W 5% CFR5, R16D20, PTC,RE-115005-BC 1.5K 1/4 W 5% CFR25, R26PEM STD(2)RE-115005-EM 1.5K 2W 5% MOFPR

50、35NW-060410-ST LCKWSH ON HEAT XFER BRKT PEMS NEAR POTRE-125005-HW 2.5K OHM, 5W, WIREWOUND 10%R37, R38PC-000038-EMRE-127005-BC 2.7K 1/4 W 5%WWR41, R42 10 3200 PCB ASSEMBLY, ContdWP-320038-PO3200 MAIN PCB ASSYPart NumberDescriptionReferenceRE-139005-CCR31RE-147005-DM 4.7K 1W 5% MOFPR15RE-151005-BC 5.1