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
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