QSC_GX3_Schematic 电路图.pdf

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1、DISPLAY AND GAIN BOARD SHUTDOWN DIODE CLAMPS ON-VOLTAGE LOSS-OF-POWER MAIN SEC A, 115VAC WITH RECTIFIER, FUSE AND EMI SNUBBER MAIN SEC B, 115VAC WITH RECTIFIER, FUSE AND EMI SNUBBER ADDRAB03/12/08PRODUCTION RELEASE ECO 8578 ADD C62,63 R113, R117 56.2K DELAY SOA CUTBACK FOR 4.4V AT 55C, FAN SPEED (RC

2、A TIP - UNBALANCED) GAIN -6DB (2VPK = 1VPK) 25C - NIL 55C - START 95C - 7MA, 1.4V AMPLIFIER THERMAL TRACKING SOA SENSE SOA SENSE 3.7V THR SETS ONSET 0C - 1.8V SENSOR 25C - 1.58V THERMAL GAIN SET AT 3.66 55C - 1.2V CHANNEL B CLIP-LIMITING PROTECTION AND LIMITING PARADIGM GAIN BLOCK AT 2.85V. THEN COL

3、LECTOR -VCC B -88V +VCC A 88V -VCC A -88V HYST F/B TRIGGERS MUTE. BIAS 95C - 0.75V 0C - 6.6V MAIN BOARD OPAMP BYPASS CAPS 8V PK INPUT DIODES PULLS ABOVE GND AND REACHES FULL LIMIT PEAK CLAMP IN 30MS RUN, LO MUTE, 1.2V NOTE GROUNDS CHASSIS SOA OVERLOAD TH BUS NORMAL CURRENT CLAMPING TRIGGERS CLIP-LIM

4、ITING CURRENT TOO HIGH WELL BELOW RAILS MILD/OCCASIONAL OK - NO EFFECT ON/OFF AND THERMAL MUTING COMMON TO BOTH CHANNELS 8V PK INPUT SUB - TOP FILTER, 2-POS FEEDBACK OF TH LIMITING AT 3.1V, SEVERE TRIGGERS CUTBACK TO 25% PK CURR TRIGGERS ON CLIP AND NEARLY FULL CURRENT SINGLE-SIDED, SLOW ATTACK/RELE

5、ASE = 80V PEAK OUT FAN NOTE AUX COIL, 24V CT EMITTER R 65C - 1.07V TO THERMAL BUS +0.55V = 80V PEAK OUT FEEDBACK TRIGGERS MUTE 0C - NIL CHA = LP, CHB = HP OFF, 100HZ. GROUNDS CHASSIS FAN SPEED DIODES CIRCUIT 3K MUTES CHANNEL A PEAK CLAMP AT TH BUS = 2.75V 3.3V THRESH THERMAL LIMIT MUTES SEVERAL DEGR

6、 ABOVE MAX LIMITING +VCC B 88V GAIN BLOCK 1.2V NOM INPUT (2V-PK) BALANCED INPUT STAGE INPUT BOARD AMPLIFIER LIMITER THRESHOLD BIAS 65C - 2MA 85C - 3.17V 25C - 5.8V 55C - 4.4V 65C - 3.9V 1 A SH_200001.SCHNONE SH-200001-00 AR-200001-00-D.ZIP IAN OVERHOLT GX3 AMPLIFIER 0.1UF 1 PCNT TRANSCONDUCTANCE OPA

7、MP 0.22UF 10 PCNT 50V +CUT-A 1 PCNT 1/10W 1 J1B SND-A 2 J1B 3 J1B 4 J1B +14V 5 J1B 6 J1B 7 J1B 8 J1B -14V 9 J1B 10 J1B SND-B 11 J1B 12 J1B +CUT-A Q8 C62 -CUT-B R115 2W 1 PCNT MC33078 AC-ON 1/10W 221K 1 PCNT LED RED BIPOLAR LED RED BIPOLAR DPDT 1/10W 1/10W 39.2K 1/8W 10 PCNT 50V +15V MMST3906 1 PCNT

8、1/10W 1 PCNT 20 PCNT RET-A 10 PCNT 47.5K MURS160T3 2SA1837 10 PCNT 4.6 IN 20 PCNT 100V 4700UF 4700UF 100V 20 PCNT 100V 20 PCNT 4700UF 100V 20 PCNT 4700UF 35V 32V 5K5K XLR XLR 2SA1962 1/10W 1 PCNT 10 PCNT 50V 220PF 5 PCNT 50V MMST3906 MMST3906 MMST3904 MMST3906 MMST3904 35V 10UF 20 PCNT 50V 0.22UF 10

9、 PCNT 10 PCNT MURS160T3 50V 0.1UF 10 PCNT 22PF 5 PCNT 50V 220PF 5 PCNT 50V 5 PCNT 220PF 50V 5 PCNT 0.1UF 100V 50V 5 PCNT 0.022UF 5 PCNT 100V 0.1UF LED BLUE 200V 0.0015UF 5 PCNT MMST3906 5 PCNT 0.0015UF 200V MMST3906 MMST3904 MMST3904 MMST3906 0.1UF 5 PCNT 100V 5 PCNT 220PF 50V 2.00K 1 PCNT 1/10W IMB

10、D4148 1/10W 1 PCNT 7.50K 2.00K 1 PCNT 1/10W 22PF 200V 5 PCNT MURS160T3 22PF 5 PCNT 200V 0.1UF 10 PCNT 250V MMST3904 5.90K 1 PCNT 1/10W 1/10W 4.75K 1 PCNT 1 PCNT 1/10W 100 1 PCNT 1/10W 12.7K 1 PCNT 1/10W 100 12.7K 1 PCNT 1/10W 50V 0.1UF 50V 10 PCNT 200V 0.1UF 10 PCNT 2SA19622SA1962 2SC4793 2SA1962 2S

11、C52422SC5242 2SC52422SC5242 MMST3904 5 PCNT 22PF 50V 5 PCNT 200V 10PF MURS160T3 1 PCNT 1/10W 5.90K MMST3904 50V 0.1UF TIP31C 20 PCNT 10UF 35V 1 PCNT 1/10W 1 PCNT 100K 1/10W MURS160T3 50V MURS160T3 5 PCNT 10PF 200V 50V 0.22UF 10 PCNT NA NA NA NA NA NA NA NA NA NA NA NA MMST3904 69.8K 1/8W1/8W 4.6 IN

12、10 1 PCNT 1 PCNT 1 PCNT1 PCNT 47.5K TRANSCONDUCTANCE OPAMP +14V 1 PCNT 1 PCNT 2.15K 1 PCNT 1/10W 10 10.0K 1/10W +15V +15V 1/10W 2.15K 1 PCNT 1/10W 2.15K 2.15K A-GND-DIS +5V 634 1/10W 20 PCNT 1000UF 1 PCNT 1/10W MMST3906 1 PCNT 100 1 PCNT 1/10W IN-A-NEG 2.15K 47.5K 10UF 20 PCNT 35V 1/10W 47.5K 1/10W

13、-CUT-A 10UF 20 PCNT 35V 1 PCNT 47.5K 1/10W 243K 1 PCNT 1/8W CLIP-A 10UF 35V 1/8W 1 PCNT 35V 20 PCNT 1/10W 5.36K 1 PCNT 1/10W 5.36K 1/10W 1/10W +5V B-LO 18 AWG 11.0 IN 18 AWG 11.0 IN 1/10W 10.0K 1 PCNT +15V 1/10W MMST3906 35V IMBD4148 1000UF 1 PCNT 1/10W 10.0K LED GREEN 3.01K 1/10W IMBD4148 1/10W 10A

14、 32V TRANSCONDUCTANCE OPAMP 1 PCNT 475 1N5399 20.0K 2W 5.6 5 PCNT 1 PCNT 100 1/10W 1/10W 1 PCNT 100 1/10W 1 PCNT 39.2K 1 PCNT 5 PCNT 2W SPKR-B 10 1/8W IMBD4148 10.0K 10 PCNT 50V +CUT-B 1/10W 1.69K 1 PCNT 1.69K 10UF +14B -14B 1.13K 1/10W 1/10W 1N5399 10 33.2 1/8W 1/10W 1 PCNT +14V 1 PCNT 1 PCNT 1/8W

15、69.8K 1N5399 2.00K 50V MMST3904 1/10W 1/10W 5 PCNT 0.15 MC33078 1 PCNT 1 PCNT 10 1 PCNT 1/8W 1 PCNT 1 PCNT 47.5 1N5399 1/8W 1 PCNT 20.0K IN-B-NEG 1 PCNT 1/10W 1 PCNT 24.9K 5 PCNT 0.1UF IN-B-POS 100V 1/10W 1 PCNT 1/10W 1 PCNT 1 PCNT 10.0K 10.0K 1/10W1/8W 20.0K LED GREEN 33.2 1 PCNT 1/8W 1 PCNT JACK 1

16、5.4K 1 PCNT 1/8W 5 PCNT 0.22UF 0.15 5 PCNT 20 PCNT 2W 5 PCNT 100K 475 1/10W -14V MC33078 1/10W 10.0K 35V 470UF 1/8W -14B MC33078 50V 0.1UF 50V 0.1UF 10 PCNT 0.1 1/10W 1 PCNT 0.15 1 PCNT 0.15 2SA1837 16.5K 475 5 PCNT -14V 20 PCNT 1/8W 470UF 33.2 1/8W 1 PCNT 39.2K 16.5K 47.5K 1/10W 243K 1/8W 931 1 PCN

17、T 0.15 1/10W 475 1 PCNT 475 10 1 PCNT 1010 1.13K 1 PCNT 1.13K 1 PCNT 1/10W 0.15 5 PCNT 2W 0.15 1/8W 1/10W 5 PCNT 0.1 10 5 PCNT 10 5 PCNT 2W 10 2W 1/8W 10 1/10W 0.1UF 0.22UF 1/10W -15V +15V 1 PCNT 10 0.1UF 33.2 1 PCNT 0.1UF 1 PCNT 10 PCNT 0.1UF 50V 2.00K 1/10W 2W MMST3904 1 PCNT 1/8W 1 PCNT 5 PCNT 33

18、.2 2W 475 1 PCNT 1/8W 10 1 PCNT 0.1 MMST3906 69.8K 2W 0.15 69.8K 1 PCNT 10 PCNT 50V 10 PCNT 1/8W 16V 2UH 2W 7.50K 20 PCNT 2W 50V +14V 16V 20 PCNT 2W 5 PCNT 383 1 PCNT 1/10W 1/10W 2W 5 PCNT 1/8W 1 PCNT 1 PCNT 1/2W MMST3904 1 PCNT 1 PCNT SENSOR 1 PCNT 1/8W 20.0K 2W -14V MC33078 5 PCNT 1 PCNT 2W 0.1 1/

19、10W +14B 10.0K 1/8W MC33078 +15V 1 PCNT MC33078 0.1UF 4.75K 47.5 1/2W MC33078 1/10W 1 PCNT 10 +5V 1/10W 2.15K 1/8W 1 PCNT 1/10W 10 PCNT 1 PCNT MMST3906 39.2K39.2K 1/10W MC33078 1 PCNT 1/10W 1 PCNT MC33078 CLIP-B SIG-A SIG-B 1/10W FB-B FB-A 1 PCNT 33.2 10M 10 1 PCNT 1/8W -CUT-B-CUT-A IMON-A SPKR-A IM

20、ON-B MC33078 10 PCNT B-LO 50V 243K 5 PCNT 1/8W 1/8W MC33078 JACK 10 5 PCNT 2W 24V 24V FB-B 1/10W 1 PCNT JACK IN-A-POS 1 PCNT IN-B-POS 1/10W LM393 LM393 LM393 5A IMBD4148 10UF 2UH 1 PCNT 5 PCNT 1/8W 10M 1/8W 1 PCNT 1/10W 1 PCNT 10 PCNT 0.1UF -14VTH-LIM 1 PCNT 1/8W MMST3906 47.5K -15V RET-A SND-ASND-B

21、RET-B+15VSIG-ACLIP-B 18 AWG 18 AWG 14.0 IN 18 AWG +5V AC-ON -15V +15V -15V 243K 10UF 1 PCNT 1/10W 2.21K 1 PCNT TH-LIM +15V 4.6 IN 18 AWG 18 AWG 11.0 IN 18 AWG B-HI 14.0 IN 18 AWG 14.0 IN 18 AWG 14.0 IN 18 AWG 1 PCNT 15.4K 1 PCNT 1/8W 10A 3.01K 1 PCNT 1 PCNT +5V 1 PCNT +CUT-B MURS160T3 2SC4793 MURS16

22、0T3 MMST3904 IMBD4148 IMBD4148 MC33078 47.5K SIG-B RET-B 4.75K 1 PCNT 1/10W 5.90K 100 1/10W 1 PCNT 1 PCNT 1.69K 1 PCNT 1.69K 1/10W 0.1UF 250V 0.1UF 1/4W 5 PCNT 1K -15V 10 PCNT CLIP-A 1/10W 1 PCNT 11.0 IN VOLTAGE REGULATOR 3.01K 1 PCNT 14.3K 1 PCNT 0.22UF 47.5K 1.13K 2W 18 AWG JACK B-HI JACK MC33078

23、MC33078 FB-A 1 PCNT 56.2K 1/8W 1 PCNT 56.2K 1/8W 25V 22UF 20 PCNT 25V 22UF 20 PCNT 20 PCNT 25V 22UF 25V 22UF 20 PCNT BRIDGE RECTIFIER 200V 5 PCNT 2W IMBD4148 MMST3906 U4 3 2 1 U4 5 6 7 U5 3 2 1 8 U4 4 8 U5 4 BR1 1 3 2 4 D11 D12 D13 D14 D7 D8 D9 D10 D3 D4 D5 D6 D15 D16 D17 D18 D1D21 D22 D2 U7 3 2 1 U

24、7 5 6 7 3 6 7 81 Q36 2 1 3 D19 C49 C50 C51 C52 C54C55 F2 F3 W6A 1 W5A 1 W2A 1 W1A 1 Q13 2 1 3 Q19 2 1 3 Q15 2 1 3 Q21 2 1 3 Q14 1 23 Q20 1 23 1 23 R21 R23 R80 R83 R84 R87 R81 R82 R90 R91 R85 R86 R92 R93 R136 C41 C42 C43 2 C44 3 Q10 2 1 3 Q11 1 Q9 1 23 R89R98 R94R99 R95R100 R96R101 R71 R72 R75 R76 R7

25、7 R74 R73 R70 Q4 2 1 3 Q22 2 1 3 Q28 2 1 3 Q34 2 1 3 Q37 2 1 3 Q29 2 1 3 Q35 2 1 3 Q38 2 1 3 Q6 2 1 3 Q24 2 1 3 Q7 1 Q25 1 2 Q51 23 Q23 1 Q2 1 23 Q1 3 Q32 1 23 Q30 1 23 R65 R66 R67 R68 R57 R63 C34 C35 C36 C37 R104 R103 R109 R108 R107 R106 R113 R117 R116 R111 R114 R112R126 R127 R132 R128 R129R133 C48

26、 C47 L2 12 L1 12 R124 R125 R130 R131 R118R122 R119R123 C31 C27 C32 C19 R61 R40 R54 R58 C20 R62 C33 C30 U5 5 6 7 C29 R56 R45 R59 R43 R27 R26 R32 R41 R42 R35 R34 C18 R25 R49R55 R51 C25 R48 R36 R30 R37 R31 R24 R46 R38R28 R52C26 R53R47 R29 C21 C22 R22 Q12 1 23 R50 R78 C28 R69 R79 R88 Q17 1 Q26 1 3 Q18 1

27、 Q27 1 8 U7 4 Q3 1 23 R60R64 R102 R105 R97 C38 C39 C40 C45 C46 12 Q33 1 D20 R110 R120 R121 Q31 1 23 J5 1 J5 2 C56 C53R134 F1 1 E2 1 E3 1 BR2 1 3 2 4 C57 E5 1 E4 1 E7 1 C58 R137 E8 1 F4 BR3 1 3 2 J2BJ2BJ2BJ2BJ2BJ2BJ2BJ2BJ2BJ2B 123456789 4 10 J2B 11 J2B 12 W3 1 1 W1B W4 1 J12 21 43 1 W2B W7 1 W8 1 1 W

28、5B J13 21 43 1 W6B R33 LD7 12 LD4 C24 11 10 9 VR2 6 VR1 1 6 R18R7 J3 1 2 3 C17 U1 3 2 1 R19 R20 U3 5 6 7 C14 U1 5 6 7 C15 1 SW1 2 3 4 5 6 7 8 U2 5 6 7 U3 3 2 1 R17 C13 C11 C12 R8 C10 R9R2R1 J9 3 1 2 J10 12 3 C2 R6 C6 R10 C5 C16 R15 R16 U2 3 2 1 U3 4 C7 C8 R3 R4 U2 4 U1 4 J6 3 1 2 J7 12 3 C3C1 U6 3 4

29、 1 7 8 25 U6 14 16 10 9 15 12 11 U6 6 E6 AI1BT1BT2 FB1FB2FP1FP2 OF1OF2 SI1BB1 C59 C60 R140 R141 SG1 1 2 3 R5 R11 C4 C9 C61 R142 C63 TH-BUS 1N4743A IMBD4148 35V 20 PCNT 1 1 PCNT Q16 1 PCNT 4.6 IN 1 PCNT 13 J1A 11 J1A 12 J1A 8 J1A 9 J1A 10 J1A 3 J1A 4 J1A 5 J1A 6 J1A 7 J1A 1 J1A 2 DENISE DELARM 03/11/

30、2008DAVID GALVAN 03/12/2008 R135 BRIDGE RECTIFIER 10 PCNT 5A E1 BRIDGE RECTIFIER 1 05/15/2007 1/10W P3 P3 P3 P3 P1 P1 P1 P1 P1 P1 P1 P1 P2 P2 P2 P2 P2 P2 P2 P2 - AC2 AC1 + A1 A1 A1 A1 A1 P3 A1 P3 A1 A1 A1 P3 P3 A1A1P3 A1 A1 A1 A1 P3P3 P3 P3 P3 P3 P3 VO GND V+ P3 P3 P3 P3 - AC2 AC1 + - AC2 AC1 + VOUT

31、VIN P1P2P3 P3 FEMALE 2-2+ 1+1- FEMALE 2-2+ 1+1- CCW W CCW W C1 C1 C1 C1 C1 R T S FEMALE 3 1 2 C1 C1 C1 C1C1 R T S FEMALE 3 1 2 AI Target 1 Board Target 1 Board Target 1 Board Fiducial 1 Board Fiducial 1 Panel Fiducial 1 Panel Fiducial 1 Offset Target 1 Offset Target 1 SI Target 1 Badboard Mark 1 SCH

32、EMATIC DIAGRAM 7 PLOT DATE: D OF QSC AUDIO PRODUCTS, THAT MAY NOT 4 WITHOUT EXPRESS WRITTEN CONSENT FROM C B A D C 54 3 65 3 D DATE SEED FILE NO. CHECKED ISSUED 7 8 NOTES: UNLESS OTHERWISE SPECIFIED B 12 REVCHKAPPROVED/DATEEFF. DATEDESCRIPTION REVISIONS APPROVALS 8 A 2 REVDWG NO.SIZE SCALESHEET 1 OF

33、 THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION WHICH IS THE PROPERTY BE DISCLOSED, REPRODUCED OR USED QSC AUDIO PRODUCTS. 1 CAD FILE NO. COSTA MESA, CALIFORNIA CAGE CODE 00PW4 CONTRACT NO. DRAWN AUDIO PRODUCTS, LLC. 6 C1 P3 J2B J2B J2B J2B J2B J2B J2B J2B J2B J2B LD6 LD3 LD2 8 6 4 J2A J2A J2A J2A J

34、2A J2A J2A J2A J2A J2A J2A J2A C23 U9U8 95C - 2.75V 2 2 3 3 33 3 3 2 3 2 3 8 8 8 -90 V NL -79 V 8 -72 V 4 -71 V 2.66 -86 V Short +90 V NL +79 V 8 +72 V 4 +71 V 2.66 +86 V Short 60 mV idle 8 : 170 mV- 4 : 320 mV- -12.1v -13.7v -14.24v -1v -1.6v -14.8v -2.94v -0.57v +0.57v NL: -40 mV- 8 : -230 mV- 4 :

35、 -300 mV- NL: 40 mV- 8 : 230 mV- 4 : 300 mV- 12.4v 13.8v 14.34v 1v 1.76v 14.8v 2.96v 8 : 170 mV- 4 : 320 mV- -14.24v -1.6v 14.34v 1.76v 0.517v0.517v +0.51v -0.51v 50 mV-50 mV- 60 mV idle 15v6v 5.7v -14.6v 3.73v 5.72v 4.88v -15.2v +3.1v -15.8v 4.3v idle 3.72v 4.23v 13v zener 12.75v 0.534v 11.44v idle

36、 60 mV idle 18.8v 0.514v 1.58v Mute: 0.7v Run: 14.8v Mute: 0.6v Run: -14.2v Run: 106 mV Run: 106 mV Mute: 0.7v Run: 14.8v Mute: 0.6v Run: -14.2v 6v 3.2v -13.7v 0.71v 44mv 44mv 8 : 195 mV 4 : 400 mV 8 : 195 mV 4 : 400 mV 1 Vrms, 1k Hz 0.5 Vrms 0.5 Vrms when gain is at maximum 4.88 Vrms when gain is a

37、t maximum 41.3 Vrms Gain of 8.86 XF-65V CH1 (VIOLET) Excessive negative output current cuts positive biasing side Excessive positive output current cuts negative biasing side 0v when inactive Very sensitive Test probe can load the bus down Troubleshoot notes: Rev C, (Revised date: Jan. 5th, 2010) 1.

38、 Power specs: a. 8 ohm: 300 W = 49 Vrms, Input sen = 1.2 Vrms b. 4 ohm: 425 W = 41.3 Vrms, Input sen = 1.012 Vrms 2. Output gain: 32.2 dB = 41.3 Vrms 3. Idle current: 0.2A; short limit current: 3.5A /CH, 6.5A /2CH (120V unit) 4. Amplifier would start with an AC voltage above 30 V. 5. Location of Out

39、put Transistors: Q13 and Q14 are located on opposite sides of the heat sink center point, in order to distribute the heat from each channel more evenly and ensure that the thermal sensor responds to both channels. Be sure to locate the “out of place” transistor when repairing a bad channel. 6. PCB R

40、evision E: added C62 (Ch2) & C63 (Ch1) = 22uF 25V, effective date: June 2008 7. .02211-00) 8 ECO# 8898, Rev B, Eff. date: Dec 2008: Output emitter resistors: 0.15 , 2 W - 0.22 , 3 W (RE- . ECO# 9297, Rev C, Eff. date: July 2009.: Output transistors: 2SA1962 (QD-000357-00) - 2SA1994 (QD-000401-00), a

41、nd 2SC5242 (QD-000356-00) - 2SC3263 (QD-000402-00). Resistors: R47 & R49: 39.2k (RE-239202-30 - 30.1k (RE-230105-GP) XF-65V CH1 (BLUE) XF-65V CH2 (GREEN) XF-65V CH2 (RED) XF-12V (YELLOW) XF-12V (YELLOW) XF-CT (GRAY) SPKR+ (WHITE) SPKR- (BLACK) SPKR+ (GRAY) SPKR- (BLACK) 15.74v 2SA1294, Rev C2SA1294, Rev C 2SA1294, Rev C2SA1294, Rev C 2SC3263, Rev C2SC3263, Rev C 2SC3263, Rev C2SC3263, Rev C 39.2k , Rev C 39.2k , Rev C 0.22 3 W Rev B 0.22 3 W Rev B 0.22 3 W Rev B 0.22 3 W Rev B 0.22 3 W Rev B 0.22 3 W Rev B 0.22 3 W Rev B 0.22 3 W Rev B RadioFans.CN 收音机爱 好者资料库