PX-2200_Series_Powered_Mixer_Service_Manual 电路图.pdf

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1、PX-2200 SERIES POWERED MIXING CONSOLES SERVICE MANUAL PX-2208 p/n 071-2208-000 (120V) PX-2208D p/n 071-2208-000 (120V) PX-2212D p/n 071-2208-000 (120V) PX-2216D p/n 071-2208-000 (120V) CONTENTS Specifications Theory of Operation Parts Lists: Input Board Output Board Digital Effects Control Spring Re

2、verb Control Mixer Top Panel Assembly Power Amp rated power, 8 Ohms) Rise Time:Less than 5.2 Seconds Slew Rate:Greater than 13.5 Volts per Second Total Harmonic Distortion:30. 1 kHz. 175 Power Amplifier Input Impedance:33 K Ohms Separation:65 dB 1 kHz. Sensitivity:1.8 dBv for rated power 1 kHz. DIME

3、NSIONS: Road Case Closed:Heigth6-1/8 WidthPX2208 20-1/8, PX2212 24-3/8,PX2216 28-5/8 Depth34-3/8 Weight:72lbsPX2208 & PX2208D 77lbsPX2212D 80lbsPX2216D 2 RadioFans.CN 收音机爱 好者资料库 THEORY OF OPERATION MIXER SECTION Theory of operation information for the mixer section was intentionally left out as the

4、mixer is made up of simple op-amp circuits. POWER AMPLIFIER The unbalanced signal from the left and right mixer outputs is normalled through the POWER AMP IN jacks and feeds the first opamp stage (U100B) in the power amplifier. U100B provides a Gain of One, and will accept a Balanced input signal if

5、 injected at the POWER AMP IN jacks. U100A contains a closed loop negative feedback path, along with positive feedback through the inverting Operational Transconductance Amplifier (OTA) U101. U100A and U101 make up the gain reduction circuit for the Delta Comp clip protection feature. The attack and

6、 release circuit for the Delta Comp is made up by the Diode, Resistor, and Capacitor network which drives the Base of Q101. Comparator U102A senses the voltage from the Collectors of Q107 & Q108. When the amplifier approches clipping, U102A provides a negative voltage to Comparator U102B (which driv

7、es the Clip Led) and to the attack/release circuit. The negative voltage drives through Diodes CR102-CR105, and charges Capacitors C108-C111 all at once in parallel as a one pole filter through a single time constant of R120 X C108-C111 or 3.9K X 8.8F or 34.3mSec. As they charge, Q101 turns on and p

8、rovides current to pin 5 of the OTA (U101). The current controls the output amplitude of U101. The inverted signal from U101 mixes with the input to U100A providing a cancelation affect which reduces the input to the power amplifier. This prevents the amplifier from clipping. When the output of the

9、power amplifier is reduced the Comparator toggles back and removes the negative control voltage from the attack/release circuit. The blocking action of Diodes CR102-CR105 force Capacitors C108-C111 to discharge (Release) through a 4-pole filter with different time constants through Resistor R119. JF

10、ET Q100 and associated components provide a 2-3 second turn-on delay for the audio input to the power amplifier. When the power is switched on, Capacitor C106 charges through Resistor R109. The negative voltage pinches off the JFET, removing the ground from the input of the amplifier. When the power

11、 is switched off, C106 immediately discharges through Diode CR100, grounding the input of the amplifier. TROUBLESHOOTING TIP: Check for proper operation of this circuit when experiencing excessive turn-on or turn off Pops, or no output when signal applied to the input. Many times the JFET itself can

12、 be the culprit. NOTE: Excessive turn-off Pops can also be caused by uneven discharge of the +/- power supplies. Usually a mismatch in the Filter Capacitors will cause this problem. Its easy to look at both supplies on an oscilloscope. Invert one scope input and check for even discharge to zero volt

13、s. Q104 is the current source for the Differential Amplifier (Q102,Q103). For the Diff amp to work properly, one half of the current from the current source must flow through each leg of the Diff amp. If the same amount of current flows through each leg of the Diff amp, the voltage drop across resis

14、tors R134 & R135 must be the same. If not, there will be a DC offset at the output of the amplifier. The overall gain of the amplifier is set up around the Diff amp. R141 (27K) is the feedback resistor and R140 (1K) is the pull-down resistor. Rfb + Rpd Rpd = A. Therefore 27K + 1K 1K = 28K 1K = 28. Q

15、109 & Q110 make up the last voltage amplification stage. Again, to operate properly, the same amount of current must flow through these transistors. Thus the voltage drop across R144 & R145 must be the same. THEORY OF OPERATION POWER AMPLIFIER CONTINUED Diodes CR125-CR128 (BYV26D) make up the Fixed

16、Bias circuit for the output transistors. The body of the Diodes is mounted through the heatsink to properly track the temperature of the transistors. These Diodes were selected because they exhibit a 2mV decrease in Knee Voltage for every 1 degree (Celsius) increase in temperature. The Collectors of

17、 Q109 & Q110 are at 0 volts. Therefore the Bias Diodes provide 2 voltage drops (1.2volts) to the Base of Driver Transistors Q113 & Q114. One Diode drop (0.6volts) Biases on the Driver Transistors. The remaining 0.6 volts drops across the output transistors in parallel, Biasing them on. Transistors Q

18、111, Q112, and associated components comprise the Current Limiting or Short Proof protection circuit. There are usually two conditions which demand excessive output current from the amplifier. A shorted speaker cable, or a load impedance which is below the minimum rating of the amplifier. If these c

19、onditions occur, the voltage drop across the Emitter Resistors (.33 5 Watt) will dramatically increase. This will cause Q111 & Q112 to turn on. This limits the amount of signal which is available to the Base of the Driver Transistors (Q113 & Q114). CR131 & CR133 sense the signal through R152 and ens

20、ure that Q111 turns on hard in conduction. The output section also contains a Crowbar protection circuit. Triac TR101 will clamp the output to ground if excessive DC (1-2 volts) appears on the output. This is a one shot circuit. If engaged, the Triac will have to be replaced. 3 RadioFans.CN 收音机爱 好者资

21、料库 PARTS LIST NOTE: AN X IN A REFERENCE DESIGNATOR REFERS TO CHANNELS 1 THROUGH 12 QUANTITIES LISTED ARE FOR THE 8 CHANNEL VERSION INPUT (8 CH & 12 CH) PRINTED CIRCUIT BOARD ASSEMBLY QTY PART # DESCRIPTION REFERENCE DESIGNATION 2028474CAP AE RDL100F25V20%C31,32 8028459CAP AE RDL2.2F50V20%CX24 240284

22、65CAP AE RDL22F25V20%CX10,X17,X19,X22,X23 2036954CAP AE RDL22F63V20%C1,4 16028460CAP AE RDL4.7F50V20%CX05,X06 18028471CAP AE RDL47F50V20%C2,5,CX03,X04 34038703CAP CA.1F50VC3,6-30,CX20 16039263CAP CA1000PF100VCX01,X02 8038699CAP CA100PF100VCX16 16039255CAP CA10PF100VCX09,X18 16039256CAP CA68PF100VCX0

23、7,X08 16041904CAP MPF.012F63V10%CX15,X21 16041903CAP MPF.018F63V10%CX11,X12 16027269CAP MPF.033F63V10%CX13,X14 8041085CONTROL SLIDE 60MM 50KRX26(FADERS) 16041081CONTROL VERT 10K 15ARX32,X34(AUX, EFFECTS) 8041080CONTROL VERT 10K B W/DETENTRX29(PAN) 8041083CONTROL VERT 50K 15ARX10(TRIM) 16041806CONTRO

24、L VERT 50K BRX36,X38(MONITOR 1,2) 24041082CONTROL VERT 50K B W/DETENTRX12,X15,X19(HIGH, MID, LOW) 24006260DIODE 1N4448/1N914B SIGNALCRX01-X03 2027329DIODE ZEN 1N5228B 3.9V .5W 5%CR1,2 6041808HEADER 8 CKT X.1 LOP1-6 12016795IC DUAL OP AMP TL072U2-4,7-9,11-13,16-18 4033281IC OP-AMP DUAL 5532U1,6,10,15

25、 2026547IC QUAD COMPARATOR LM339U5,14 8016917JACK 1/4 PCB 3/CD DCCJX03(CHANNEL INSERT) 8030987JACK 1/4 PCB 3/CD DOCJX02(LINE INPUT) 8030762JACK XLR FM PC VERT MT (A/D)JX01(MICROPHONE INPUT) 8030754LED RED T-1 3MM DIFFUSEDLDX01(PEAK INDICATOR) 1041863PCB ASSY 8 CH INPUT PX2208/16D(STUFFED) 1041898PCB

26、 ASSY 12 CH INPUT PX2212D(STUFFED) 1041861PCB FAB 8 CH INPUT PX2208D/16D(RAW BOARD) 1041896PCB FAB 12 CH INPUT PX2212D(RAW BOARD) PARTS LIST INPUT (8 CH & 12 CH) PRINTED CIRCUIT BOARD ASSEMBLY CONTINUED QTY PART # DESCRIPTION REFERENCE DESIGNATION 8041847RES CF1/6W5%10RX23 2041850RES CF1/6W5%820R2,4

27、 16041851RES CF1/6W5%910RX14,X16 8041852RES CF1/6W5%1KRX21 8041853RES CF1/6W5%1.1KRX13 8041854RES CF1/6W5%1.3KRX17 16041855RES CF1/6W5%3.3KRX09,X11 24041856RES CF1/6W5%5.1KRX25,X37,X39 16041857RES CF1/6W5%6.8KRX18,X20 8041848RES CF1/6W5%10KRX45 16041858RES CF1/6W5%18KRX27,X28 32041859RES CF1/6W5%24K

28、RX30,X31,X33,X35 8041819RES CF1/6W5%27KRX22 32041820RES CF1/6W5%100KRX24,X40,X43,X44 8041821RES CF1/6W5%330KRX41 2024942RES CF1/4W5%22R1,3 16016951RES MF1/4W1%1.21KRX01,X02 8024970RES CF1/4W5%1.8KRX42 32016965RES MF1/4W1%12.1KRX05-X08 16047173RES MF1/2W1%6.81KRX03,X04 4039420SCRW M 4-40X3/8 PHP SS S

29、EMS(STANDOFF TO PCB MOUNT) 8033276SPACER RND NYL .120X.187X.500LDX01 4033275STANDOFF 4X5/8 RND AL 8041079SWITCH DPDT ALT-ACTSX01 4 PARTS LIST OUTPUT PRINTED CIRCUIT BOARD ASSEMBLY QTY PART # DESCRIPTION REFERENCE DESIGNATION 1038534CABLE JMPR 3CKT .1X3.0P302A,302B 7028458CAP AE RDL1F50V20%C305-311 2

30、028459CAP AE RDL2.2F50V20%C101,156 6028461CAP AE RDL10F35V20%C209,210,316,317,334,335 33028465CAP AE RDL22F25V20%C2,4,5,9,12,14,15,26,28,29,52-55, 91,92,202,204-206,211,218,219, 312,313,319,323,330,331,350-353 2028471CAP AE RDL47F50V20%C95,215 3038694CAP AE AX100F16VC93,94,399 2028485CAP AE RDL470F1

31、6V20%C328,329 5042000CAP CA18PF100VC18,20,23,25,27 2038873CAP CA22PF100VC320,324 2042001CAP CA33PF100VC1,3 16038698CAP CA47PF100VC16,21,102-105,125-128,214,216, 217,314,315,339 1039256CAP CA68PF100VC302 10038699CAP CA100PF100VC17,19,22,207,208,212,303,304,332, 333 18038703CAP CA.1F50VC6,7,10,13,24,9

32、6-99,213,296-299, 326,327,396,397 1027281CAP MPF.22F63VC301 1041096CONNECTOR BNC VERTJ12 2041807CONTROL VERT 100K 15A DUALR54,364 3041086CONTROL VERT 10K 15A DUALR236,353,375 18031936CONTROL SLIDE 20MM 50KWR103-107,110-113,136-140,143-146 5041085CONTROL SLIDE 60MM 50KR6,14,22,30,46 3041080CONTROL VE

33、RT 10K B W/DETENTR238,310,355 2041083CONTROL VERT 50K 15AR206,218 4041806CONTROL VERT 50K BR228,232,345,349 7006260DIODE 1N4448/1N914B SIGNALCR1,2,3,5,6,8,302,310,311 2027329DIODE ZEN 1N5228B 3.9V .5W 5%CR4,206 1027327DIODE ZEN 1N5234B 6.2V .5W 5%CR205 2031635DIODE ZEN 1N5240B 10V .5W 5%CR312,313 10

34、31041FSTN TAB ML RTANG PCB .25X.032CP1 9041808HEADER 8 CKTX.1 LOP1-5,101-103,201 1041823IC COMPARATOR DUAL LM2903U9 8016795IC DUAL OP AMP TL072U3,4,7,10,203,301,302,304 8031611IC DUAL OPAMP PC4560U1,2,101,111,204,206,303,307 2041091IC LED DRIVER 12 SEG LB1412U305,306 PARTS LIST OUTPUT PRINTED CIRCUI

35、T BOARD ASSEMBLY CONTINUED QTY PART # DESCRIPTION REFERENCE DESIGNATION 1028047IC OP AMP MC1436/SG1436YU205 1026547IC QUAD COMPARATOR LM339U8 18030771JACK 1/4 PCB 2/CD SCCJ1-8,10,201-207,301,302 2016917JACK 1/4 PCB 3/CD DCCJ9,11 1030987JACK 1/4 PCB 3/CD DOCJ303 2040181JACK PHONO DUAL VERT PC MOUNTJ1

36、3,304 8020888JUMPER WIRE 22 GA 2041090LED ARRAY 12 SEGLD302,303 1030755LED GREEN T-1 3MM DIFFUSEDLD6 7030754LED RED T-1 3MM DIFFUSEDLD1-5,203,301 1041868PCB ASSY OUTPUT PX22XX(STUFFED) 1041866PCB FAB OUTPUT PX22XX(RAW BOARD) 1024942RES CF1/4W5%22R99 5024947RES CF1/4W5%47R61,63,64,255,256 3024952RES

37、CF1/4W5%100R252,367,368 2024954RES CF1/4W5%150R300,393 1024961RES CF1/4W5%470R248 12024963RES CF1/4W5%680R115,148,320-324,337-341 1024964RES CF1/4W5%820R34,392,394 10024965RES CF1/4W5%1KR7,15,23,31,47,56,58,210,222,301 1024969RES CF1/4W5%1.5KR247 3024970RES CF1/4W5%1.8KR35,40,52,307 3024971RES CF1/4

38、W5%2.2KR304,314,332 2029610RES CF1/4W5%3KR316,333 15024977RES CF1/4W5%4.7KR229,230,233,234,237,240,302,346, 347,350,351,354,357,396,398 6028034RES CF1/4W5%5.1KR5,13,227,231,344,348 5024980RES CF1/4W5%8.2KR27,109,114,142,147 28024981RES CF1/4W5%10KR3,4,11,12,20,53,60,62,102,108, 135,141,235,239,250,2

39、54,318, 328, 329,335,352,356,376-381 2024983RES CF1/4W5%12KR313,331 2024985RES CF1/4W5%15KR317,334 1024986RES CF1/4W5%18KR65 2029006RES CF1/4W5%20KR18,19 8024987RES CF1/4W5%22KR101,134,241-246 16024988RES CF1/4W5%27KR2,10,225,226,258,305,309,311,312, 325,326,342,343,373,374,387 5 PARTS LIST OUTPUT P

40、RINTED CIRCUIT BOARD ASSEMBLY CONTINUED QTY PART # DESCRIPTION REFERENCE DESIGNATION 2028865RES CF1/4W5%30KR319,336 1024989RES CF1/4W5%33KR303 1028956RES CF1/4W5%43KR251 4024993RES CF1/4W5%47KR358-361 2024995RES CF1/4W5%68KR327,330 7024996RES CF1/4W5%82KR17,36,48,212,224,257,386 20024997RES CF1/4W5%

41、100KR8,16,24,32,37,38,49,50,55,57,211, 223,259,260,306,382,388-391 2025058RES CF1/4W5%180KR244,246 5025061RES CF1/4W5%330KR33,39,51,249,315 3025069RES CF1/4W5%1MR385,395,397 1030737RES CF1/2W5%5.6R399 3025937RES CF1/2W5%22R253,371,372 1025941RES CF1/2W5%560R59 2039128RES FILM1W5%120R369,370 6039420S

42、CRW M 4-40X3/8 PHP SS SEMS(EQ, DIGITAL REVERB MOUNT) 2047810SCRW TF 2-56X1/4 PHP ZN J12 8033276SPACER RND NYL .120X.187X.500LD1-6,203,301 6041824SPACER ROUND .187X.350LD302,303 1040533STANDOFF 4-40X.937( BNC CONNECTOR) 5033275STANDOFF 4X5/8 RND AL(PCB TO TOP PANEL MOUNT) 9041079SWITCH DPDT ALT-ACTS3

43、-5,201-205,301 2041077SWITCH SLIDE 2P3TS1,2 2014689XSTR N-CH JFET J111 TO-92Q301,302 1028760XSTR NPN 2SC3298A TOP-220Q201 2014867XSTR NPN MPSU10 TO-202Q304,306 2014866XSTR PNP MPS U60Q305,307 PARTS LIST DIGITAL REVERB CONTROL PRINTED CIRCUIT BOARD ASSEMBLY QTY PART # DESCRIPTION REFERENCE DESIGNATIO

44、N 1041092PCB UNIT DSP REVERB(DIGITAL EFFECTS UNIT W/OUT CONTROL BOARD) 2041818BRACKET RT ANGLE(DIG REV CONTROL BOARD MNT) 1041814CABLE 10CKT X 101MM W/CONNECTP3 1041815CABLE 12CKT X 101MM W/CONNECTP2 2038703CAP CA.1F50VC4,5 1027278CAP MPF.1F63V10%C11 1027281CAP MPF.22F63VC7 3028461CAP AE RDL10F35V20

45、%C1,2,3 4028465CAP AE RDL22F25V20%C6,8-10 8006260DIODE 1N4448/1N914B SIGNALCR1-8 2041074ENCODER 16 POS BIS1,2 1041816HEADER 8CKT RT ANGP1 1028120IC 4053B TPL 2 CHAN ANLG SWU5 1031611IC DUAL OP AMP PC4560U4 2041812IC REGULATOR +5V MC7805CTU1,2 1041813IC REGULATOR -5V MC7905CTU3 8020888JUMPER WIRE 22G

46、A .5X.175W1-8 1041878PCB ASSY DIG REV CONTROL PX22(STUFFED) 1041876PCB FAB DIGITAL REV CONTROL(RAW BOARD) 3024965RES CF1/4W5%1KR1,2,15 1024971RES CF1/4W5%2.2KR4 2024977RES CF1/4W5%4.7KR3,11 6024981RES CF1/4W5%10KR6,7,8,9,13,14 2024987RES CF1/4W5%22KR5,10 1025081RES CF1/4W5%5.6MR12 4032908SCRW TF 6-3

47、2X3/8 PHP ZI(PCB MOUNT) 3016742XSTR PNP 2N4403 TO-92Q1-3 6 PARTS LIST SPRING REVERB PRINTED CIRCUIT BOARD ASSEMBLY (PX-2208 ONLY) QTY PART # DESCRIPTION REFERENCE DESIGNATION 1041818BRACKET RIGHT ANGLE 1028577CABLE REVERB 30 1039259CAP CA220pF100V5%C6 1039266CAP CA3300pF100V5%C1 2028459CAP AE RDL2.2

48、F50V20%C2,3 2028479CAP AE RDL220F25V20%C4,5 1041816CONNECTOR 8 CKT RT ANGLEP1 1016795IC DUAL OP AMP TLO72U1 1041893PCB ASSY SPRING REVERB PX 2208(STUFFED) 3024942RES CF1/4W225%R2,8,9 2024965RES CF1/4W1K5%R4,7 2024971RES CF1/4W2.2K5%R1,11 2024993RES CF1/4W47K5%R3,10 1024997RES CF1/4W100K5%R6 1028995R

49、ES CF1/4W130K5%R5 1020489REVERB UNIT 4 SPRING 4BB3C1B(PAN) PARTS LIST MIXER TOP PANEL CHASSIS ASSEMBLY QTY PART # DESCRIPTION REFERENCE DESIGNATION 15041832BUTTON SWITCH 5.5X10MM GRAY( SOLO SWITCHES) 2041831BUTTON SWITCH 5.5X5.5MM GRAY( PHANTOM PWR, REVERB DEF) 3041817CABLE RIBBON 8 CKT 5(INPUT / MASTER INTERCONNECT) 1047930CHS ASSY TOP PNL PX2208D 1040888CHS A