QSC-EX1250-pwr-sch 维修电路原理图.pdf
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1、AUDIO PRODUCTSPHQ 5-15-91SCHEMATIC EX-1250DRAWING1 3NOTES.1. ALL RESISTORS 1/4-WATT, 5% UNLESS NOTED.2. ALL CAPACITORS 100V UNLESS NOTED.TOLERANCE 20% FOR ELECTROLYTIC TYPES, 10% ON OTHER TYPES.PC-004001-00PC-004002-00DISPLAY PCBINPUT PCBSPKR PCB101-199201-2991-29301-399401-49931-49501-599601-69951-
2、69701-799801-89971-99901-UP (SAME BOARD FOR CH 1, CH2)PCB NUMBER DESCRIPTION CH 1 PARTS CH 2 PARTS PARTS IN COMMON8. PARTS MARKED WITH TRIANGLE MUST BE REPLACED WITH EXACT TYPE ONLY.9. PARTS ENCLOSED WITHIN DOTTED OUTLINE HAVE VOLTAGES GREATER THAN 42V.SCHEDULE OF TEST POINTSETCJ 502-1CH-1CH 2J 502-
3、6 J 602-6 SWITCHED POS AMPLIFIER RAIL-HIGH VOLTAGEJ 502-1 J 602-1 NEGATIVE LIMITING VOLTAGEJ 502-2 J 602-2 POSITIVE LIMITING VOLTAGEJ 502-4 J 602-4 AMPLIFIER LOOP OPAMP OUTPUTJ 502-8 J 602-8 SWITCHED NEG AMPLIFIER RAIL-HIGH VOLTAGEJ 502-3 J 602-3 SWITCHING THRESHOLD REFERENCE VOLTAGEPC-004104-00PC-0
4、04101-00AMP PCBPC-004103-00AC PCB3. BRIDGE RECTIFIER BR 51, 1.5A, 100V.4. R 598, 698 IS POSITIVE TEMPERATURE COEFFICIENT RESISTOR MOUNTED TO HEAT SINK.6. ZENERS D 503, 504, 603, 604 MARKED 7.5 V TESTED FOR LOW LEAKAGE, QSC P/N QD-0007.5-ZT.7. ZENERS D 509, 513, 609, 613, 6.2V-500mW, TESTED FOR LOW L
5、EAKAGE, QSC P/N QD-000024-QD.+23V 0N/OFF ENABLETRANSFORMER THERMAL SENSORTHERMAL BUS TO FAN SPEED CONTROL1N4004220035V-15 V REG-24 V UNREG100+24 V UNREG+15 V REG78153211N4746, 18V1N4746, 18V100220035V791532118 Vac118 Vac2CT3+24 V+15 V-15 V-24 VXF PTCXF PTCJ 51U 52D 53D 52U 51C 54C 53C 56C 55D 51BR 5
6、135 V35 VSHEET 1, HOUSEKEEPING SUPPLY AND FAN SPEED CONTROLSHEET 1, HOUSEKEEPING SUPPLY AND FAN SPEED CONTROL-24 V24 V BRUSHLESS FAN2.7K2.7K2.7K2.7K47K.01RN 51C 52Q 522N2907Q 532N4410R 52R 51C 57C 51Q 512SC3298B100-35V47-10NP+23V 0N/OFF ENABLETRANSFORMER THERMAL SENSORTHERMAL BUS TO FAN SPEED CONTRO
7、LJ 52-1J 52-4TO SHEET 2TO SHEET 3SCHEMATIC, 2-CH POWER AMPLIFIER EX 1250SCHEMATIC, 2-CH POWER AMPLIFIER EX 1250PART NUMBERING SCHEDULE FOR PCBS USED IN EX-1250:5. Q 503, 504, 603, 604 ARE SWITCHING FETS. QSC P/N QD-000013-00 OR QD-000031-QD.125 W, 50 V MINIMUM, ON-RESISTANCE 0.030 OHMS MAX.54ABCDB P
8、ROD RELEASE PER ECO 1107 GLFA3.3-1WR 53HEAT SINK GROUNDAUDIO AND POWER GROUNDSC REVISED PER ECO 1127 RDS7-12-915-29-91SGMDREVISED PER ECO 1262LGRESISTANCE 100 OHM COLD, RISING AT 55 C. QSC P/N RE-000006-PTE REVISED PER ECO 1289 PHQ11-6-91DOC NO. SH-004101-01SGMSGM10-9-91SGMF REVISED PER ECO 1508 SGM
9、6-10-92APPLICATIONUSED ONNEXT ASSYWP-004101-10EX1250REV E, 11-6-91, FOR PC-004101-00 REV DSGMG REVISED PER ECO 1602 WR10-21-921342LAST USED REF. DESIGN.C51 - 57, C526, 626D51 - 53, D513, 613F504, 604J51, 52, J503, 603K501, 601L501, 601Q51 - 53, Q510, 610R51 - 53, R544, 644, R598, 698, R599, 699RN51,
10、 RN502, 602U51, 52, U506, 606VR503, 603BR 51, BR 502, 602SGMH REVISED PER ECO 2009LG/RAB180KSGMJ REVISED PER ECO 2371 MP (EFF. 7-28-94)5-11-94FAN BLKFAN REDSGMK REVISED PER ECO 2506 MP (EFF. 12-09-94)7-20-94SH-004101-01 1 KSH1250J1.FCDSH1250K1.FCDSH-004101-01 KRadioFans.CN 收音机爱 好者资料库2 OF 3ASPKR SIGG
11、NDGNDGNDACLIP10K-2W470-10V470-10V10K-2WTO +15VTO +15 VTO -15 V5K5K7.5K-2W22-1W2SA1302.22-3W2SC3281IN540222-1W4.7-1W4.7-1W2SA1306B2SC3298B.102.7-2WDGS.1015K750K750K332332A1K-42.7K55321N54022uH.1012345678+15 V-15 VACDBHEATSINKGROUNDSPEAKER BUSAUDIO OUTPUT STAGESWITCHING THRESHOLDREFERENCE.0022470-10V2
12、2 FP3K-2W7.5V7.5V.0033100BIASSOURCE REFDGS 22 FP2.7-2W.10.22-3W3 PL3 PL3 PL3 PL10A-250V10A-250VSPEAKERCOMMON10A-250V10A-250VTRANSFORMERCENTER TAPSPEAKEROUTPUTNCNOTO -24 V1N40041N400425 C.0150 OHMBIASNETWORK1N400410-25VTO -24 V470-1WPTC-60CTHERMALLYCONNECTEDMUR 810MUR 8105.6-2WT7T8GATESOURCE REFGATE
13、DRIVERSCHMIDTT COMPARATORLOSS-OF-SATSHUTDOWNT9HIGH RAILIC-000008-00T4SLEWNEG SUPPT6BOOTSTRAP CAPT1REF VOLTT2LOW RAILT3SHUTDOWNT5T6T7GATEGATE DRIVERLOSS-OF-SATSHUTDOWNIC-000009-00T5GATE PWRT4SLEWT3SHUTDOWNT2LOW RAILT1REF VOLTSOURCE REFSCHMIDTTCOMPARATORT 6+15 VT15-15 VT16PROCESSING BUFFER50C +O.5V90C
14、 +8VTHERM ADJUST, 0.5-8.5VTHERMAL SENSINGT 1T 3GROUNDMUTING INPUT CAP.TIMING CAP.T 2RELAYDRIVERT 4ON-OFF MUTING DELAYRELAYMUTE -24VRUN +15VMUTING BUSRUN 0VMUTE +8VSHUTDOWN MUTINGIC-000010-00MUTE BUST 5T 7THERMAL SENSE, 0-8VT 8THERMAL BUS, 0-8VT 9OP-AMP OUT - HF PROTECTSHUTDOWN DETECTORSTO MUTINGDC P
15、ROTECT SENSET10THERMAL LIMITINGT11IDLE -1.2VCLIP +3V PEAKS0-3Vac NORMAL AUDIO4.5-6.5Vac CLIPPING PEAKSMUTE +4.5VLIMITING THRESHOLD +4.5VCLIP RECTIFIER-BUFFERHIGH FREQDC RECTIFIERTHERMALT12T13T14CLIP BUSOP-AMP OUTOPTOCELLT25POSITIVE DRIVER, +0.6V IDLET24NEGATIVE DRIVER, -0.6V IDLET23POSITIVE BYPASS,
16、+7.5V NORMAL, +2.5V SHORTPOSITIVE BIASCONTROLLERT22POSITIVE CURRENT FEEDBACK +3V PEAKT21POS CURRENT TRIMMERT20OUTPUT VOLTAGE FEEDBACKLOAD IMPEDANCESENSINGT19NEGATIVE TRIMMERBIAS ENABLENEGATIVE BIASCONTROLLERT18NEGATIVE CURRENT FEEDBACK, -3V PEAKT17NEGATIVE BYPASS, -7.5V NORMAL, -2.5V SHORTBIAS680pJ
17、502-1J 502-3J 502-6J 502-8J 502-2+ CURR LIM+ CURR LIM- CURR LIM- CURR LIM- CURR LIMR 598U 501D 504R 511Q 504R 512C 503C 509J 5016-PIN MATE-LOK346125D 502C 511BR 502BR 501F 502F 504F 501F 503K 501VR 501R 599C 504D 505D 506R 508R 503R 506R 501R 505R 507Q 502R 504R 502Q 501R 519R 518R 520R 521R 522Q 50
18、8Q 509Q 510D 508Q 505Q 506Q 507R 516R 515R 517D 507L 501R 525C 506C 510C 5075.6-2WR 523D 503U 502R 514R 510C 505Q 503D 501R 509C 501C 508TO RECT BR 501TO RECT BR 502TO Q 5083K-2WR 526U 505-BR 534C 523RN 502R 535U 505-AC 519C 512R 530R 528C 513VR 503VR 502R 529C 518U 503R 527C 515C 514C 516R 53147-50
19、V47-50VD 51247K-1WR 542TO -15V+23V 0N/OFF ENABLETRANSFORMER THERMAL SENSORTHERMAL BUS TO FAN SPEED CONTROLTO SHEET 1SCHEMATIC, EX-1250, SHEET 2, AMPLIFIER CHANNEL ASCHEMATIC, EX-1250, SHEET 2, AMPLIFIER CHANNEL A590J 52-5J 52-6+92 V RAIL+46 V RAIL+46 +92 V SWITCHED BUS-46 V RAIL-92 V RAIL-46 -92 V S
20、WITCHED BUSTO -92 V RAILTO -46 V RAIL15000-50V15000-50V15000-50V15000-50V1.5K1.5KC 502 47-50VR 513 22K-1W3.9-2WR 524R 532, 47K65121311J 502-4+INPUTGND REFPWR-ONAUDIO INPUT STAGEHEAVY LINE SHOWSMAIN SIGNAL PATHSPEAKER BUS47K-1WR 533VTL 5C4U 50468 p1N4735A553210K-421.5K-.5W75K47BA356847+15 V-15 VDC216
21、.2 VA.0022.1247-10NPC 525U 506-BR 541RN 501U 506-AD 511C 520C 521R 538R 536R 537C 524R 540C 522R 539D 5091N 4148D 5101N 41481N47356.2 VD 513C 5261.5 KA7914590TO +46 V RAIL590R 54427K220-10NPC 517THERMALMUTE14-PIN RIBBONJ 503108R 543330K27 pSH-004101-01 2 KSH-004101-01 KSH1250K2.FCD18pF-5%RadioFans.C
22、N 收音机爱 好者资料库ASPKR SIGGNDGNDGNDA10K-2W470-10V470-10VTO +15V+24 V+15 V-15 V-24 V10-25VTO +15 VTO -15 V5K5K7.5K-2WN.C.N.C.N.C.N.C.PTC-60CTHERMALLYCONNECTED22-1W2SA1302.22-3W2SC3281IN540222-1W4.7-1W4.7-1W2SA1306B2SC3298B.103.9-2WDGS.1015K750K750K332332A1K-42.7K55321N54022uH.1012345678+15 V-15 VACDBHEATS
23、INKGROUNDSPEAKER BUSAUDIO OUTPUT STAGESWITCHING THRESHOLDREFERENCE.0022470-10V22 FP3K-2W7.5V7.5V1N4004.00331N4004100BIAS25 C.0150 OHMBIAS NETWORKSOURCE REFDGS 22 FP2.7-2W.10.22-3W3 PL3 PL3 PL3 PL10A-250V10A-250VSPEAKERCOMMON10A-250V10A-250VTRANSFORMERCENTER TAPSPEAKEROUTPUTNCNOTO -24 VMUR 810MUR 810
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