QSC-GX3-pwr-sch 维修电路原理图.pdf

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1、DISPLAY AND GAIN BOARDSHUTDOWNDIODE CLAMPS ON-VOLTAGELOSS-OF-POWERMAIN SEC A, 115VACWITH RECTIFIER, FUSEAND EMI SNUBBERMAIN SEC B, 115VACWITH RECTIFIER, FUSEAND EMI SNUBBERADDRAB03/12/08PRODUCTION RELEASE ECO 8578 ADD C62,63R113, R117 56.2K DELAY SOA CUTBACKFOR 4.4V AT 55C, FAN SPEED(RCA TIP - UNBAL

2、ANCED)GAIN -6DB (2VPK = 1VPK)25C - NIL55C - START95C - 7MA, 1.4VAMPLIFIERTHERMAL TRACKINGSOA SENSESOA SENSE3.7V THR SETS ONSET0C - 1.8VSENSOR25C - 1.58VTHERMAL GAIN SET AT 3.6655C - 1.2VCHANNEL BCLIP-LIMITINGPROTECTION AND LIMITING PARADIGMGAIN BLOCKAT 2.85V. THEN COLLECTOR-VCC B -88V+VCC A 88V-VCC

3、A -88VHYST F/BTRIGGERS MUTE.BIAS95C - 0.75V0C - 6.6VMAIN BOARD OPAMP BYPASS CAPS8V PK INPUTDIODESPULLS ABOVE GND ANDREACHES FULL LIMITPEAK CLAMPIN 30MSRUN, LOMUTE, 1.2VNOTEGROUNDSCHASSISSOA OVERLOADTH BUSNORMAL CURRENT CLAMPING TRIGGERS CLIP-LIMITINGCURRENT TOO HIGH WELL BELOW RAILSMILD/OCCASIONAL O

4、K - NO EFFECTON/OFF AND THERMAL MUTING COMMON TO BOTH CHANNELS8V PK INPUTSUB - TOP FILTER, 2-POSFEEDBACKOF TH LIMITING AT 3.1V,SEVERE TRIGGERS CUTBACK TO 25% PK CURRTRIGGERS ON CLIP AND NEARLY FULL CURRENTSINGLE-SIDED, SLOW ATTACK/RELEASE= 80V PEAK OUTFANNOTEAUX COIL, 24V CTEMITTER R65C - 1.07VTO TH

5、ERMAL BUS +0.55V= 80V PEAK OUTFEEDBACKTRIGGERS MUTE0C - NILCHA = LP, CHB = HPOFF, 100HZ.GROUNDSCHASSISFAN SPEEDDIODESCIRCUIT3K MUTESCHANNEL APEAK CLAMPAT TH BUS = 2.75V3.3V THRESHTHERMAL LIMIT MUTES SEVERAL DEGR ABOVE MAX LIMITING+VCC B 88VGAIN BLOCK1.2V NOM INPUT (2V-PK)BALANCED INPUT STAGEINPUT BO

6、ARDAMPLIFIERLIMITER THRESHOLDBIAS65C - 2MA85C - 3.17V25C - 5.8V55C - 4.4V65C - 3.9V1ASH_200001.SCHNONESH-200001-00AR-200001-00-D.ZIPIAN OVERHOLTGX3 AMPLIFIER0.1UF1 PCNTTRANSCONDUCTANCE OPAMP0.22UF10 PCNT50V+CUT-A1 PCNT1/10W1J1BSND-A2J1B3J1B4J1B+14V5J1B6J1B7J1B8J1B-14V9J1B10J1BSND-B11J1B12J1B+CUT-AQ8

7、C62-CUT-BR1152W1 PCNTMC33078AC-ON1/10W221K1 PCNTLED RED BIPOLARLED RED BIPOLARDPDT1/10W1/10W39.2K1/8W10 PCNT50V+15VMMST39061 PCNT1/10W1 PCNT20 PCNTRET-A10 PCNT47.5KMURS160T32SA183710 PCNT4.6 IN20 PCNT100V4700UF4700UF100V20 PCNT100V20 PCNT4700UF100V20 PCNT4700UF35V32V5K5KXLRXLR2SA19621/10W1 PCNT10 PC

8、NT50V220PF5 PCNT50VMMST3906MMST3906MMST3904MMST3906MMST390435V10UF20 PCNT50V0.22UF10 PCNT10 PCNTMURS160T350V0.1UF10 PCNT22PF5 PCNT50V220PF5 PCNT50V5 PCNT220PF50V5 PCNT0.1UF100V50V5 PCNT0.022UF5 PCNT100V0.1UFLED BLUE200V0.0015UF5 PCNTMMST39065 PCNT0.0015UF200VMMST3906MMST3904MMST3904MMST39060.1UF5 PC

9、NT100V5 PCNT220PF50V2.00K1 PCNT1/10WIMBD41481/10W1 PCNT7.50K2.00K1 PCNT1/10W22PF200V5 PCNTMURS160T322PF5 PCNT200V0.1UF10 PCNT250VMMST39045.90K1 PCNT1/10W1/10W4.75K1 PCNT1 PCNT1/10W1001 PCNT1/10W12.7K1 PCNT1/10W10012.7K1 PCNT1/10W50V0.1UF50V10 PCNT200V0.1UF10 PCNT2SA19622SA19622SC47932SA19622SC52422S

10、C52422SC52422SC5242MMST39045 PCNT22PF50V5 PCNT200V10PFMURS160T31 PCNT1/10W5.90KMMST390450V0.1UFTIP31C20 PCNT10UF35V1 PCNT1/10W1 PCNT100K1/10WMURS160T350VMURS160T35 PCNT10PF200V50V0.22UF10 PCNTNANANANANANANANANANANANAMMST390469.8K1/8W1/8W4.6 IN101 PCNT1 PCNT1 PCNT1 PCNT47.5KTRANSCONDUCTANCE OPAMP+14V

11、1 PCNT1 PCNT2.15K1 PCNT1/10W1010.0K1/10W+15V+15V1/10W2.15K1 PCNT1/10W2.15K2.15KA-GND-DIS+5V6341/10W20 PCNT1000UF1 PCNT1/10WMMST39061 PCNT1001 PCNT1/10WIN-A-NEG2.15K47.5K10UF20 PCNT35V1/10W47.5K1/10W-CUT-A10UF20 PCNT35V1 PCNT47.5K1/10W243K1 PCNT1/8WCLIP-A10UF35V1/8W1 PCNT35V20 PCNT1/10W5.36K1 PCNT1/1

12、0W5.36K1/10W1/10W+5VB-LO18 AWG11.0 IN18 AWG11.0 IN1/10W10.0K1 PCNT+15V1/10WMMST390635VIMBD41481000UF1 PCNT1/10W10.0KLED GREEN3.01K1/10WIMBD41481/10W10A32VTRANSCONDUCTANCE OPAMP1 PCNT4751N539920.0K2W5.65 PCNT1 PCNT1001/10W1/10W1 PCNT1001/10W1 PCNT39.2K1 PCNT5 PCNT2WSPKR-B101/8WIMBD414810.0K10 PCNT50V

13、+CUT-B1/10W1.69K1 PCNT1.69K10UF+14B-14B1.13K1/10W1/10W1N53991033.21/8W1/10W1 PCNT+14V1 PCNT1 PCNT1/8W69.8K1N53992.00K50VMMST39041/10W1/10W5 PCNT0.15MC330781 PCNT1 PCNT101 PCNT1/8W1 PCNT1 PCNT47.51N53991/8W1 PCNT20.0KIN-B-NEG1 PCNT1/10W1 PCNT24.9K5 PCNT0.1UFIN-B-POS100V1/10W1 PCNT1/10W1 PCNT1 PCNT10.

14、0K10.0K1/10W1/8W20.0KLED GREEN33.21 PCNT1/8W1 PCNTJACK15.4K1 PCNT1/8W5 PCNT0.22UF0.155 PCNT20 PCNT2W5 PCNT100K4751/10W-14VMC330781/10W10.0K35V470UF1/8W-14BMC3307850V0.1UF50V0.1UF10 PCNT0.11/10W1 PCNT0.151 PCNT0.152SA183716.5K4755 PCNT-14V20 PCNT1/8W470UF33.21/8W1 PCNT39.2K16.5K47.5K1/10W243K1/8W9311

15、 PCNT0.151/10W4751 PCNT475101 PCNT10101.13K1 PCNT1.13K1 PCNT1/10W0.155 PCNT2W0.151/8W1/10W5 PCNT0.1105 PCNT105 PCNT2W102W1/8W101/10W0.1UF0.22UF1/10W-15V+15V1 PCNT100.1UF33.21 PCNT0.1UF1 PCNT10 PCNT0.1UF50V2.00K1/10W2WMMST39041 PCNT1/8W1 PCNT5 PCNT33.22W4751 PCNT1/8W101 PCNT0.1MMST390669.8K2W0.1569.8

16、K1 PCNT10 PCNT50V10 PCNT1/8W16V2UH2W7.50K20 PCNT2W50V+14V16V20 PCNT2W5 PCNT3831 PCNT1/10W1/10W2W5 PCNT1/8W1 PCNT1 PCNT1/2WMMST39041 PCNT1 PCNTSENSOR1 PCNT1/8W20.0K2W-14VMC330785 PCNT1 PCNT2W0.11/10W+14B10.0K1/8WMC33078+15V1 PCNTMC330780.1UF4.75K47.51/2WMC330781/10W1 PCNT10+5V1/10W2.15K1/8W1 PCNT1/10

17、W10 PCNT1 PCNTMMST390639.2K39.2K1/10WMC330781 PCNT1/10W1 PCNTMC33078CLIP-BSIG-ASIG-B1/10WFB-BFB-A1 PCNT33.210M101 PCNT1/8W-CUT-B-CUT-AIMON-ASPKR-AIMON-BMC3307810 PCNTB-LO50V243K5 PCNT1/8W1/8WMC33078JACK105 PCNT2W24V24VFB-B1/10W1 PCNTJACKIN-A-POS1 PCNTIN-B-POS1/10WLM393LM393LM3935AIMBD414810UF2UH1 PC

18、NT5 PCNT1/8W10M1/8W1 PCNT1/10W1 PCNT10 PCNT0.1UF-14VTH-LIM1 PCNT1/8WMMST390647.5K-15VRET-ASND-ASND-BRET-B+15VSIG-ACLIP-B18 AWG18 AWG14.0 IN18 AWG+5VAC-ON-15V+15V-15V243K10UF1 PCNT1/10W2.21K1 PCNTTH-LIM+15V4.6 IN18 AWG18 AWG11.0 IN18 AWGB-HI14.0 IN18 AWG14.0 IN18 AWG14.0 IN18 AWG1 PCNT15.4K1 PCNT1/8W

19、10A3.01K1 PCNT1 PCNT+5V1 PCNT+CUT-BMURS160T32SC4793MURS160T3MMST3904IMBD4148IMBD4148MC3307847.5KSIG-BRET-B4.75K1 PCNT1/10W5.90K1001/10W1 PCNT1 PCNT1.69K1 PCNT1.69K1/10W0.1UF250V0.1UF1/4W5 PCNT1K-15V10 PCNTCLIP-A1/10W1 PCNT11.0 INVOLTAGE REGULATOR3.01K1 PCNT14.3K1 PCNT0.22UF47.5K1.13K2W18 AWGJACKB-HI

20、JACKMC33078MC33078FB-A1 PCNT56.2K1/8W1 PCNT56.2K1/8W25V22UF20 PCNT25V22UF20 PCNT20 PCNT25V22UF25V22UF20 PCNTBRIDGE RECTIFIER200V5 PCNT2WIMBD4148MMST3906U4321U4567U53218U448U54BR11324D11D12D13D14D7D8D9D10D3D4D5D6D15D16D17D18D1D21D22D2U7321U756736781Q36213D19C49C50C51C52C54C55F2F3W6A1W5A1W2A1W1A1Q1321

21、3Q19213Q15213Q21213Q14123Q20123123R21R23R80R83R84R87R81R82R90R91R85R86R92R93R136C41C42C432C443Q10213Q111Q9123R89R98R94R99R95R100R96R101R71R72R75R76R77R74R73R70Q42 13Q22213Q28213Q34213Q37213Q29213Q35213Q38213Q6213Q24213Q71Q2512Q5123Q231Q2123Q13Q32123Q30123R65R66R67R68R57R63C34C35C36C37R104R103R109R10

22、8R107R106R113R117R116R111R114R112R126R127R132R128R129R133C48C47L212L112R124R125R130R131R118R122R119R123C31C27C32C19R61R40R54R58C20R62C33C30U5567C29R56R45R59R43R27R26R32R41R42R35R34C18R25R49R55R51C25R48R36R30R37R31R24R46R38R28R52C26R53R47R29C21C22R22Q12123R50R78C28R69R79R88Q17 1Q26 13Q181Q2718U74Q312

23、3R60R64R102R105R97C38C39C40C45C4612Q331D20R110R120R121Q31123J51J52C56C53R134F11E21E31BR21324C57E51E41E71C58R137E81F4BR3132J2BJ2BJ2BJ2BJ2BJ2BJ2BJ2BJ2BJ2B123456789410J2B11J2B12W311W1BW41J1221431W2BW71W811W5BJ1321431W6BR33LD712LD4C2411109VR26VR116R18R7J3123C17U1321R19R20U3567C14U1567C151SW12345678U2567

24、U3321R17C13C11C12R8C10R9R2R1J9312J10123C2R6C6R10C5C16R15R16U2321U34C7C8R3R4U24U14J6312J7123C3C1U63417825U61416109151211U66E6AI1BT1BT2FB1FB2FP1FP2OF1OF2SI1BB1C59C60R140R141SG1123R5R11C4C9C61R142C63TH-BUS1N4743AIMBD414835V20 PCNT11 PCNTQ161 PCNT4.6 IN1 PCNT13J1A11J1A12J1A8J1A9J1A10J1A3J1A4J1A5J1A6J1A7

25、J1A1J1A2DENISE DELARM03/11/2008DAVID GALVAN03/12/2008R135BRIDGE RECTIFIER10 PCNT5AE1BRIDGE RECTIFIER105/15/20071/10WP3P3P3P3P1P1P1P1P1P1P1P1P2P2P2P2P2P2P2P2-AC2AC1+A1A1A1A1A1P3A1P3A1A1A1P3P3A1A1P3A1A1A1A1P3P3P3P3P3P3P3VOGNDV+P3P3P3P3-AC2AC1+-AC2AC1+VOUTVINP1P2P3P3FEMALE2-2+1+1-FEMALE2-2+1+1-CCWWCCWW

26、C1C1C1C1C1RTSFEMALE312C1C1C1C1C1RTSFEMALE312AI Target1Board Target1Board Target1Board Fiducial1Board Fiducial1Panel Fiducial1Panel Fiducial1Offset Target1Offset Target1SI Target1Badboard Mark1SCHEMATIC DIAGRAM7PLOT DATE:DOF QSC AUDIO PRODUCTS, THAT MAY NOT4WITHOUT EXPRESS WRITTEN CONSENT FROMCBADC54

27、3653DDATESEED FILE NO.CHECKEDISSUED78NOTES: UNLESS OTHERWISE SPECIFIEDB12REVCHKAPPROVED/DATEEFF. DATEDESCRIPTIONREVISIONSAPPROVALS8A2REVDWG NO.SIZESCALESHEET 1 OFTHIS DOCUMENT CONTAINS PROPRIETARYINFORMATION WHICH IS THE PROPERTYBE DISCLOSED, REPRODUCED OR USEDQSC AUDIO PRODUCTS.1CAD FILE NO.COSTA M

28、ESA, CALIFORNIACAGE CODE00PW4CONTRACT NO.DRAWNAUDIO PRODUCTS, LLC.6C1P3J2BJ2BJ2BJ2BJ2BJ2BJ2BJ2BJ2BJ2BLD6LD3LD2864J2AJ2AJ2AJ2AJ2AJ2AJ2AJ2AJ2AJ2AJ2AJ2AC23U9U895C - 2.75V223333332323888-90 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 Short60 mV idle 8 : 170 mV-4 :

29、320 mV-12.1v-13.7v-14.24v-1v-1.6v-14.8v-2.94v-0.57v+0.57vNL: -40 mV-8 : -230 mV-4 : -300 mV-NL: 40 mV-8 : 230 mV-4 : 300 mV-12.4v13.8v14.34v1v1.76v14.8v2.96v8 : 170 mV-4 : 320 mV-14.24v-1.6v14.34v1.76v0.517v0.517v+0.51v-0.51v50 mV-50 mV-60 mV idle 15v6v5.7v-14.6v3.73v5.72v4.88v-15.2v+3.1v-15.8v4.3v

30、idle3.72v4.23v13v zener12.75v0.534v11.44v idle60 mV idle 18.8v0.514v1.58vMute: 0.7vRun: 14.8vMute: 0.6vRun: -14.2vRun: 106 mVRun: 106 mVMute: 0.7vRun: 14.8vMute: 0.6vRun: -14.2v6v3.2v-13.7v0.71v44mv44mv8 : 195 mV4 : 400 mV8 : 195 mV4 : 400 mV1 Vrms, 1k Hz0.5 Vrms0.5 Vrmswhen gain is at maximum4.88 V

31、rmswhen gain is at maximum41.3 VrmsGain of 8.86XF-65V CH1 (VIOLET)Excessive negative output currentcuts positive biasing sideExcessive positive output currentcuts negative biasing side0v when inactiveVery sensitiveTest probe can load the bus down Troubleshoot notes:1. Power specs: a. 8 ohm: 300 W =

32、49 Vrms, Input sen = 1.2 Vrms b. 4 ohm: 425 W = 41.3 Vrms, Input sen = 1.012 Vrms2. Output gain: 32.2 dB = 41.3 Vrms3. 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 Output Transistors: Q13 and Q14 are loc

33、ated 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 Revision E: added C62 (Ch2) & C63 (Ch

34、1) = 22uF 25V, effective date: June 20087. Output emitter resistors were upgraded to 3 watts (RE-.02211-00), effective date: December 2008.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)15.74vRadioFans.CN 收音机爱 好者资料库