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SR-6520 / SR-8520 /P / PD SERVICE MANUAL
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1. 049146 SCALE 55 PLOTTED 5 7 6 5 4 3 2 anita ee le U 4789 OUTPUT TEST RATED OUTPUT AT 2 OHMS 1 KHZ 15 528 WATTS R M S AT 6 2 0 AT RATED POWER LINE VOLTAGE S2 25vac n cree 222 105982 cra 4 R44 185 47 10 ow 21 1 105962 adev 252 3 9K Bee NOTES UNLESS OTHERWISE SPECIFIED B POWER TRANSFORMER 25448 1 ALL RESISTORS KW lt 5 2 ALL CAPACITORS 63 VOLT MINIMUM DC VOLTAGES READ TO GROUND WITH A D V M AND NO SIGNAL APPLIED AT RATED LINE VOLTAGE 4 AC VOLTAGES READINGS TAKEN WITH A D V M in GROUND UNDER THE FOLLOWING CONDITIONS BROUNDO 9 1 1 KHZ INPUT 4 2 2 OHM DUMY LOAD CONNECTED ANO 5 FULL POWER OUTPUT EQUALS 528 WATT WITH 0 lt 2 AT 1 KHZ AT RATED POWER LINE VOLTAGE 6 VOLTAGE TP 2 IS WITH OUTPUT BELOW CLIPPING OR COMPRESSION 7 70 AOJUST BIAS CONNECT 0 BETWEEN OUTSIDE LEAD OF R25 CVOLTMETER 05 3 AND THE OUTSIDE LEAD OF 35 CVOLTHETER 6 3 ADJUST R29 50 THAT VOLTS IS INDICATED WITH THE HEATSINK COLD et SEE SERVICE DIAGRAM 5 8 LAST INSTANCES Cas 25 FAL 029 278 51 Ta US XF3 3 UNLESS OTHERWISE NOTED ALL CR INSTANCES ARE 1N4448 NOTE FOR ALL 128
2. CP1S N A NOTE FOR ALL 128 VOLT UNITS 11 IS CONNECTED TO 518 5 USING 18 BLACK WIRE SUPPLIED IN THESE VERSIONS ON EXPORT UNITS TRANSFORMER VIOLET 15 CONNECTED TO AND VIOLET WHITE IS CONNECTED 70 51 ELIMINATES THE WHITE WIRE USED DOMESTIC UNITS DASHED LINES INDICATE CONNECTION OF BLUE TRANSFORMER WIRES IN oF EXPORT UNITS ONLY h 5 SCREW 6 32 MACHINE WASHER SPLIT LOCK 6 EXTRA DUTY HEATSINK SPACER 6 WASHER FLAT 6 MICA INSULATOR 70 20 MICA INSULATOR 220 0 SCREW 4 499 MACHINE PHILLIPS NYLON SHOULDER WASHER NYLON INSULATING SLEVE ON EXPORT UNITS WIRES FROM 75 1 ADE REPLACED 21 TUF 4 40 MACHINE PHILLIPS CHECKED BY ULA DATE if APPROVED 1 REVISIONS oe O e ea O fs p e id wee fe idiots ae 185 23 DES ITEM aTyY PART NO DESCRIPTION DATABASE FILE SRPWRP DB PROPRIETARY THIS Cosine MUSICAL INSTRUMENTS 1138 Columbia Street Bres 92621 ee SERVICE DIAGRAM Suen 520 WATT SR POWER AMPLIFIERS SIZE DRAWING NUMBER NEXT HIGHER ASSEMBLY 033325 SUNN 586520 91
3. WARRANTY PHILOSOPHY ON DIGITAL REVERB MODULE Replacement rather than repair of the 041092 module is the recommended warranty procedure for failures of the module PARTS LIST NOTE SHADED ITEMS ARE FOR REFERENCE ONLY NOTICE Reference designators 100 199 refer to and are listed only for channel 1 Channel 2 designators are 200 299 etc Part quantities are listed only for the SR 6520PD 6 channel version QTY PART 037832 037875 049148 049271 028577 038534 048914 028485 028492 028465 028474 033605 037943 033606 028459 028460 020909 069724 025984 007029 025986 025777 020842 033588 033578 036234 033590 033591 033596 033579 033580 033581 PRINTED CIRCUIT BOARD ASSEMBLY DESCRIPTION PCB ASSY PREAMP SR6520P PCB ASSY PREAMP SR8520P PCB ASSY PREAMP SR6520PD PCB ASSY PREAMP SR8520PD CABLE ASSY REVERB 30 CABLE JUMPER 3CKT RIBBON CABLE RIBBON 8CKT RIBBON RDL 16V 470uF 20 RDL 16V 10000 20 RDL 25V 22uF 20 RDL 25V 100uF 20 AE RDL 50V 15uF 20 AE RDL 50V 33uF 10 AE RDL 50V 47uF 20 RDL 50V 2 2uF 20 RDL 50V 4 7uF 20 CAPCD 1 47pF 10 CD 1 100 10 CD 1 180 10 CAP CD 1 220 10 1 390 10 1 470pF 10 CAP CD 1 500 10 CAP PF RDL 100V 01uF 10 CAP PF RDL 100V 001 1
4. R62 R10 R47 49 51 63 66 68 R55 R1 61 R7 15 28 29 R2 60 R59 R46 48 50 53 56 R65 R58 R4 5 R23 24 33 34 fused R8 9 26 30 fused R11 R45 R43 44 R35 42 R69 AT U3 4 z elg PART 014171 033051 037568 025805 036235 025804 029779 032906 025802 026411 022376 017746 014689 025748 016739 025751 025744 014408 014867 027745 016742 025752 025745 014866 027744 037883 026038 010401 026541 033331 012473 033576 032900 POWER AMP PARTS LIST PRINTED CIRCUIT BOARD ASSEMBLY CONT DESCRIPTION SCREW M 4 40X3 8 PHP BLX SCREW 6 32X1 2 PHPS 2 SCREW M 6 32X3 4 PHP 21 SLEEVE INSULATING 3 16 SPACER AL 6X1 4X1 4 STANDOFF 6 32X1 2 RND AL SWITCH THERMAL NC OPEN 248 F SWITCH THERMAL NO CLOSE 19492 TAB MALE 250 032 PCB MT THERMISTOR 2 5 ohm 8 AMP WASHER FLAT 6X3 8 NI WASHER SHOULDER NYL 1 8X1 4 XSTR N CH JFET J111 92 XSTR NPN 25 1567 126 XSTR NPN 2N4401 TO 92 XSTR NPN 2SC2362K 92 XSTR NPN MJ15022 3 XSTR NPN MPSA63 TO 92 XSTR NPN MPSU10 TO 202 XSTR NPN 25 2336 TO 220 XSTR PNP 2N4403 TO 92 XSTR PNP 2SA1016K 92 XSTR PNP MJ15023 3 XSTR PNP MPSU60 TO 202 XSTR PNP NEC 2SA1006B TO 220 REAR PANEL POWER AMP ASSEMBLY POWER AMP ASSY 120V BUSHING SR 625X 062X37 64 BLX BUSHING SR 625X 125X37 64 WHT CABLE ASSY POWER CORD CABLE ASSY POWER
5. Ceramic Axial CR Chrome Plated CAP CD Ceramic Disk HWH Hex Washer Head CAP MPF Metalized Polyester Film M Machine Screw CAPMY Mylar NI Nickel Plated CAP PFF Polyester Film Foil OHP Oval Head Phillips PB Particle Board RESISTOR CODES PHP Head Phillips PHPS Pan Head Phillips Sems RES CC Carbon Comp SMA Sheet Metal A Point RES CF Carbon Film SMB Sheet Metal Point RES FP Flame Proof Ss Stainless Steel RES MF Metal Film TF Thread Forming RES WW Wire Wound 21 Zinc Plated Fender Musical Instruments Corp 7975 North Hayden Road Scottsdale AZ 85258 POWER AMPLIFIER SECTION Power output Distortion at 520 watts Minimum load impedance Sensitivity Input impedance DELTACOMP range PREAMP SECTION Input impedance Hi Z Input Sensitivity for 520 watts Channel tone controls Graphic equalizer Dimensions Height Width Depth Weight SPECIFICATIONS PR 189 520 Watts R M S 2 Ohms 350 Watts R M S 4 Ohms Less than 2 1 kHz into 2 Ohms 2 Ohms 1 28V R M S 22K ohm 20 dB LOW Z 1 82k HI Z 18 2k 55 mV MAIN MASTER and CHANNEL Main at maximum all tone controls and GEQ at 0 detent LOW 15 dB at 100 Hz MID 15 dB at 750 Hz HIGH 15 dB at 10 kHz 12 dB at 63 125 250 500 1k 2k 4k 8k and 16kHz SR 6520PD SR 8520PD 10 7 16 inches 26 5 10 7 16 inches 26 5 cm 23 5 8 inches 60 0 cm 27 5 8 i
6. MUSICAL INSTRUMENTS UNDER THE FOLLOWING COMDITIONS CHANNEL NUMBERS 1138 Columbia Street GRAPHIC EQUALIZER AND LOW FREQUENCY HIGH FREQUENCY Breo Ca 92621 CONTROLS AT CENTER TRAVEL ROTATION MAIN AND MONITOR REVERB AT MINIMUM areata teres SCHEMATIC PREAMP 586520 AND 588520 AND ALL OTHER CONTROLS AT MAXIMUM ge ROR opo oa SIZE DRAWING NUMBER REV 4 LAST INSTANCE 50 0107 NEXT HIGHER ASSEMBLY D 2 1 8 2 4 B c39 28 102 Pi R6 SPS US 20 005 ENGR HUGHES INSTANCE 652 AND 861 DELETED ANGLES 20300 paTe 12 1 88 1 1 8 7 5 5 4 3 2 1 2181 1 82 12 1 MICROPHONE 182 1 1 1 0 D 22 TPS c6 47pF R16 1102 LINE 5 mVAC 1 0 2 a 25V gt BES AUX INPUT 50 15 Pl 1 15VAC 1 il 15V TAPE 4 INPUT 47pF sial 1 9 550 1 Sy aie 068 uF BBB pF SHIELD 546 71 OVAC 1 1 5 15 N TPIS 8 R32 3 838 1 8 2 lt R31 40 22Kn SOK AB SKB SOK 3B SOK nB BK 5B ue uP 10 cee 47pF A 63Hz 25 2 1 2 4kHz 16KHz NOTES UNLESS OTHERWISE SPECIFIED 1 ALL VOLTAGES READ TO GROUND WITH A D V M UNDER THE FOLLOWI
7. Q14 amp Q15 and 1 2 volts is provided to the base of the Driver Transistors This provides or 0 6 volts to the bases of the output transistors Q18 Q25 in parallel biasing them on Transistors Q12 Q13 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 conditions occur the voltage drop across the Emitter Resistors 330 5 Watt will dramatically increase On the positive side of the amplifier C11 charges through R25 amp R27 On the negative side C12 charges through R31 amp R32 This will cause Q12 amp Q13 to turn on This limits the amount of signal which is available to the Base of the Driver Transistors 014 017 DIFFERENCES IN VERSIONS In all versions SR6520 8520 SR6520P 8520P amp SR6520PD 8520PD the power amp remained unchanged normal schematic revisions were not related to version changes The P version added Phantom power which caused the preamp PCB assy to change by adding traces to carry phantom power to the XLR microphone connectors and added a 15V regulator circuit to the preamp PCB assy in order to provide the phantom power The PD version added digital effects PCB assy 041875 and a ribbon cable to connect the PCB s together P2 to P3 along with some obvious cosmetic changes
8. 0 CAP PF RDL 100V 015uF 10 CAP PF RDL 100V 022uF 10 CAP PF RDL 100V 033uF 10 CAP PF RDL 100V 068uF 10 CAP PF RDL 100V 0015uF 10 CAP PF RDL 100V 0022uF 10 CAP PF RDL 100V 0033uF 10 REFERENCE DESIGNATION STUFFED STUFFED STUFFED STUFFED SR6520 8520 P P2 TO P3 SR6520 8520 P TAPE IN SR6520 8520PD C11 C10 C14 16 25 103 104 111 C7 C29 C37 C27 C3 12 18 20 105 106 C5 114 115 C4 6 13 15 21 24 112 113 101 102 107 108 C34 C110 C42 c9 C36 C32 40 C41 C26 C31 C1 2 8 39 116 117 C30 C35 C17 38 1 Na N 4 gt N oog AON N PART 033582 033583 033586 064089 006260 027416 016795 030771 030987 025933 049295 037248 028098 028039 028097 031879 031266 033002 031267 040534 024942 024947 024965 024969 024971 024980 024981 024985 024987 024993 029613 024997 028549 024999 025058 025059 PREAMP PARTS LIST PRINTED CIRCUIT BOARD ASSEMBLY CONT DESCRIPTION CAP PF RDL 100V 0039 10 CAP PF RDL 100V 0047uF 10 CAP PF RDL 100V 0068 10 DIODE 1N4003 DIODE 1N4448 SIGNAL BENT HEADER 8 PIN IC DUAL OP AMP TLO72C JACK 1 4 PCB 2COND SCC JACK 1 4 PCB 3COND DOC JACK PHONO DUAL PC MOUNT JACK RCA QUAD VERT PC MOUNT JACK XLR FEMALE PC MOUNT LED 5X5mm GREEN SLB 55MG3 LED 5X5mm RED SLB 55VR3 LED 5X5mm YELLOW SLB 55YY3 POT RTRY 5
9. 025970 025982 069724 024854 027278 027257 064089 006260 020534 025821 031019 027329 025996 020775 028330 020798 020789 027416 031269 025796 027404 016795 027387 POWER AMP PARTS LIST PRINTED CIRCUIT BOARD ASSEMBLY DESCRIPTION PCB ASSY POWER AMP PCB ASSY POWER AMP PCB ASSY POWER AMP PCB SR6520P SR8520P PWR AMP RDL 50V 2 2uF 20 RDL 50V 4 7uF 20 RDL 50V 47uF 20 RDL 16V 100uF 20 RDL 35V 1000 20 RDL 80V 6800uF 20 1KV 5 10 1 68 10 1 100 10 MPF 400V 1uF 10 CAP MPF 63V 10 CAP MPF 100V 0022uF 10 DIODE 1N4003 DIODE 1 4448 SIGNAL BENT DIODE 1N5402 RECTIFIER 200V DIODE HV FDH400 SWITCHING DIODE ZENER 1N5245B 5W 15V DIODE ZENER 1N5228B 3 9V FUSE CLIP PCB 250 amp 5mm FUSE CLIP PCB 5 FUSE QA 1 1 4X1 4 250V 10AMP FUSE QA 5mm 250V 5AMP FUSE QA 5mm 250V HEADER 1 CTR 8 CKT SQ PIN HEATSINK SR SERIES HEATSINK TO 220 IC 3080EA OTA IC DUAL OP AMP TLO72C INDUCTOR AIR CORE RDL 2 5uH REFERENCE DESIGNATION 120V 220V 240V 100V BLANK BOARD 1 2 5 24 26 29 C3 10 C22 23 C6 11 12 NON POLAR C16 17 C14 15 C7 C8 9 C30 C13 C18 21 25 22 25 28 29 1 3 13 16 17 26 27 30 37 20 21 14 15 18 19 CR2 CR38 1 100V 120V XF2 3 220V 240V F1 100V 120V F1 220V 240V F2 3
10. 0K 30A TAPER POT RTRY 50K B TAPER POT RTRY 50KB TAPER CNTR DT POT SLIDE 50KB 45mm CNTR DT CONTROL SL 60MM CSE 50K PANASONIC RES CF 1 4W 220 5 RES CF 1 4W 47 5 RES 1 4W 1K 5 RES CF 1 4W 1 5K 5 RES CF 1 4W 2 2K 5 RES CF 1 4W 8 2K 5 RES 1 4W 10K 5 RES 1 4W 15K 5 RES CF 1 4W 22K 5 RES CF 1 4W 47K 5 RES 1 4W 91K 5 RES CF 1 4W 100K 5 RES CF 1 4W 110K 5 RES CF 1 4W 150K 5 RES CF 1 4W 180K 5 RES CF 1 4W 220K 5 REFERENCE DESIGNATION C28 C43 C33 109 CR2 CR1 1 01 9 101 102 1 3 8 J102 J2 RCA SR6520 8520 P J2A B 5 6520 8520 PD J101 LD3 LD1 LD2 R6 R8 19 22 29 30 117 120 122 R110 112 R33 37 40 43 SR6520 8520 P R33 37 40 43 SR6520 8520PD R2 R14 R11 15 21 24 28 46 R1 10 R25 48 50 52 54 56 58 60 62 64 R109 115 116 119 R39 44 R3 5 12 13 32 38 R27 R31 R7 16 18 26 118 121 123 R55 63 9 20 23 45 113 R53 R114 R61 R51 59 aga gt lt gt PART 029450 025061 031819 031818 036375 033574 029904 027113 027182 016739 9904814100 033326 028939 041109 028841 028797 028800 038511 038513 038514 038515 041835 041833 041836 041834 041837 038537 049153 049154 014172 037990 038538 PREAMP PARTS LIST PRINTED CIRCUIT BOARD ASSEMBLY CONT DESCRIPTION RES CF 1 4W 240K 5 RES CF 1 4W 330K 5 RES MF 1 4W 1 82K 1 RES MF 1 4W 18 2K 1 SPACER R
11. 220V 240V ONLY 1 MAIN HEATSINK 03 4 02 U1 L1 QTY d A PART 017974 074211 69904200200 025674 013562 013564 024952 024956 024961 024963 024965 024967 024971 024975 024977 025942 024981 024985 024987 024988 024989 024993 024997 024998 024999 025069 033205 036960 031900 027627 027628 032958 032905 027638 POWER AMP PARTS LIST PRINTED CIRCUIT BOARD ASSEMBLY CONT DESCRIPTION MICA PAD TO 220 MICA PAD TO 3 PRE GREASED NUT PEM 6 32 POT TRIM LINEAR 30 1 5K REGULATOR 15V MC7815CT REGULATOR 15V MC7915 RES CF 1 4W 100 5 RES CF 1 4W 220 5 RES CF 1 4W 470 5 RES CF 1 4W 80 5 RES CF 1 4W 1K 5 RES CF 1 4W 1 2K 5 RES CF 1 4W 2 2K 5 RES CF 1 4W 3 9K 5 RES CF 1 4W 4 7K 5 RES CF 1 4W 7 5K 5 RES 1 4W 10K 5 RES 1 4W 15K 5 RES CF 1 4W 22K 5 RES 1 4W 27K 5 RES CF 1 4W 33K 5 RES 1 4W 47K 5 RES CF 1 4W 100K 5 RES CF 1 4W 120K 5 RES CF 1 4W 150K 5 RES CF 1 44W 1M 5 RES 1 4 15 5 RES 1 4W 47 5 RES 1 2 15K 5 RES FILM 1W RES FILM 2W RES WW SW RES WW 10W 400 5 SCREW TF 4 40X3 8 HWH 21 10 5 47ohm 5 330hm 10 REFERENCE DESIGNATION Q14 17 Q18 25 AT Q18 25 R20 Bias adjust U3 U4 R67 R21 22 R27 31 R57 R3 6 14 25 32 54 64 R19 R12 13 16 17 R18 52
12. ART 1 e BO ea 041092 041818 041814 041815 038703 027278 027281 028461 028465 006260 041074 041816 028120 031611 041812 041813 041878 041876 024965 024971 024977 024981 024987 025081 025069 032908 016742 PARTS LIST DIGITAL REVERB CONTROL PRINTED CIRCUIT BOARD ASSEMBLY DESCRIPTION PCB UNIT DSP REVERB BRACKET RT ANGLE CABLE 10CKT X 101MM W CONNECT CABLE 12CKT X 101MM W CONNECT CAP CA 50V CAP MPF 63V 10 CAP MPF 22uF 63V CAP AE RDL 35V 20 CAP AE RDL 22uF 25V 20 DIODE 1N4448 1N914B SIGNAL ENCODER 16 POS BI HEADER 8CKT RT ANG IC 4053B TPL 2 CHAN ANLG SW IC DUAL AMP 4560 IC REGULATOR 5V MC7805CT IC REGULATOR 5V MC7905CT PCB ASSY DIG REV CONTROL PX22 PCB FAB DIGITAL REV CONTROL RES CF 1 4W 5 1K RES CF 1 4W 5 2 2K RES CF 1 4W 5 4 7K RES CF 1 4W 5 10K RES CF 1 4W 5 22K RES CF 1 4W 5 5 6M RES CF 1 4W 5 1M SCRW TF 6 32X3 8 PHP ZI XSTR PNP 2N4403 TO 92 REFERENCE _DESIGNATION DIGITAL EFFECTS UNIT W OUT CONTROL BOARD DIG REV CONTROL BOARD MNT P3 P2 4 5 11 C7 C1 2 3 C6 8 10 1 8 51 2 1 05 04 01 2 U3 STUFFED RAW BOARD R1 2 15 R4 R3 11 R6 7 8 9 13 14 R5 10 R12 PCB MOUNT Q1 3 i 8 7 5 4 3 2 1 SS esos 1 81288 cs a reveaseo
13. CORD FAN 115V 4 1 8 GASKET FAN 4 9X4 9 JACK PHONE 1 4 CURRENT REFERENCE DESIGNATION AT 08 14 17 AT Q18 20 23 25 AND STANDOFFS AT Q19 24 AT Q18 25 AT Q19 24 HEATSINK MOUNT TS1 CIRCUIT BREAKER TS2 FAN HI LO SPEED CP 1 25 TH1 AT Q19 24 AT Q14 17 Q1 Q8 Q12 27 28 Q2 3 4 10 Q18 20 22 24 Q29 Q11 Q14 15 Q13 36 Q5 6 9 Q19 21 23 25 Q7 Q16 17 DOMESTIC 100 120V PWR CORD 220 240V PWR CORD 100V 120V 220V 240V SPEAKER OUTPUT QTY NNNARORAAAOND 5 PART 016352 069393 049155 049156 032925 031184 015627 025804 026479 031153 9904300100 026401 049150 049151 040951 040952 031867 027849 019275 027846 031845 032524 021972 017393 026576 026625 REAR PANEL PARTS LIST POWER AMP ASSEMBLY CONT DESCRIPTION NUT HEX 3 8 32X3 32 TK NI NUT HEX 6 32 EXT LOCK PANEL REAR POWER AMP SR6520PD PANEL REAR POWER AMP SR8520PD RECTIFIER BRIDGE DIODE SCREW 6 32 1 4 PHPS BLX SCREW TF 6 32X3 4 PHP BLX STANDOFF 6 32X1 2 RND AL SWITCH ROCKER DPST WASHER FLAT 3 8X 614 NI WASHER LCK INTL 3 8X 681X 032 21 WASHER SHLDR FIBER 3 8 5 8 CABINET ASSEMBLY CABINET ASSY SR6520PD CABINET ASSY SR8520PD CABINET ASSY SR6520P CABINET ASSY SR8520P CORNER 2 HOLE W NOTCH BLK PWDRD GLIDE CAB 1 24X 335 BLX GLIDE CUSHION INSERT HANDLE 9 25 NO LOGO HANDLE CAP 2 3 16 BLK PWDRD HANDLE INSERT NUT T 10 32X3 4 STR 3
14. ND NYL 147X 250X 720 STANDOFF SWEDGE 4 40X 937 SWITCH PUSHBUTTON PC MOUNT TERMINATION RING 6 18 14GA WIRE 18GA BONDED BLACK XSTR NPN 2 4401 TO 92 REFERENCE DESIGNATION R47 57 R49 R101 104 R105 108 AT LD1 3 1 2 CRIMPED ON GND WIRE GND TO FOIL SHIELD Q1 FRONT PANEL PREAMP ASSEMBLY BUSHING SNAP IN CABLE RIBBON 8 CIRCUIT KNOB GRAPHIC EQUALIZER KNOB EQ BXR SERIES KNOB PUSHBUTTON KNOB RTRY DARK BLUE KNOB RTRY LIGHT GRAY KNOB RTRY SALMON 177C KNOB RTRY RED 192C KNOB RTRY PURPLE 265C KNOB RTRY GREEN BASIC KNOB CTL DBL GRY BLUE KNOB CTL DBL GRY WHT KNOB CTL DBL GRY BLK KNOB CTL DBL GRY GREEN KNOB CTL DBL GRY DK GRY NUT JAM 3 8 32 BLK NYLON PANEL FRONT SR6520PD PANEL FRONT SR8520PD SCREW M 4 40X1 4 PHP BLX SCREW PLASTITE 6X3 8 PHP BLX WASHER FW 3 8X5 8X3 32 BLK NYLON POT SHAFT INTERCONNECT SR6520 8520 P SR6520 8520 P SR6520 8520PD LOW MID HIGH LEVEL MAIN REV MON REV MONITOR EFF REV SEND AUXILIARY LOW MID HIGH SR6520P 8520P PD LEVEL SR6520P 8520P PD MAIN REV MON REV MONITOR SR6520P 8520P PD EFF REV SEND SR6520P 8520P PD AUXILIARY SR6520P 8520P PD 1 4 INPUT JACKS 037786 SR6520P 037826 SR8520P PCB TO PANEL MTG XLR RCA JACKS 1 4 JACKS Soo 32 2 Pp 2p AP PART 033310 033311 033312 032927 028459 028460 028471 025787 028494 025786
15. NG CONDITIONS 1 1 GRAPHIC EQUALIZER LOW MID AND HIGH FREQUENCY CONTROLS AT CENTER TRAVEL ROTATION MAIN AND MONITOR REVERB AT MINIMUM ALL OTHER CONTROLS AT MAXIMUM KHz UNBALANCED INPUT AT 7102 e 8 7 ALL RESISTORS 40 5 ALL CAPACITORS 63 VOLT MINIMUM LAST INSTANCE C43 CPi 2 18 LD3 P5 R64 52 US CIRCUITRY WITHIN DASHED LINES IS IDENTICAL FOR EACH CHANNEL INSTANCE NAMES IN EACH CHANNEL ARE KEYED TO THE CHANNEL NUMBERS 6 Ol 4 3 2 zone _________ approve aon ___ 296 12 95 1 29 af sf 57 ao O68 pF ae RIE 2 4901 R9 128 Behn TAPE RID 1 OUTPUT 2 ener 472 PHANTOM 16V 13 11 R13 iaka R15 MAIN OUTPUT iKa 1 1 BVAC INPUT CC Ere 1 DIGITAL REVERB EFFECTS P N 081875 SW LED 15V REVERB RETURN vol fo Pe MONITOR 9 MONITOR OUTPUT 56KB Re REVERBE 30 RETURN 5K R23 REVERB 37 MAIN 15 REVERB INPUT GROUND 1 GEQ OUTPUT PWR AMP INPUT 25 R45 1009 185 2 8 2 ces 47pF DATABASE FILE PROPRIE
16. POWERED MIXERS w DIGITAL EFFECTS SR 6520P p n 071 6521 100 120V SR 8520P p n 071 8521 100 120V ELECTRONICS SR 6520PD p n 071 6521 200 120V SR 8520PD p n 071 8521 200 120V SERVICE MANUAL SR 6520 SR 8520 P PD SR 6520P PD SR 8520P PD These are the model names for warranty claims MARCH 1998 IMPORTANT NOTICE The information contained herein is CONFIDENTIAL and PROPRIETARY to Fender Musical Instruments Corp It is disclosed solely for use by qualified technicians for purposes of equipment maintenance and service It is not to be disclosed to others without the expressed permission of Fender Musical Instruments Co All specifications subject to change without notice CONTENTS Notices For warranty repair service only Fender specified part numbers are to be used It is recommended they also be used Specifications for post warranty maintenance and repair Circuit description Parts lists Parts marked with an asterisk indicate the required use of that specific part This is necessary for RELIABILITY and SAFETY requirements DO NOT USE A SUBSTITUTE Preamp PCB assy Front panel assy Pwr amp PCB assy Rear panel assy Cabinet assembly Miscellaneous A coded naming convention is used in the description of certain parts The codes and what they mean are as follows Dig cntrl CAPACITOR CODES HARDWARE CODES Schematics Service diagram CAP AE Aluminum Electrolytic BLX Black Oxide
17. PRNG BLX SCREW M 10 32X1 1 8 OHP BLX SCREW SMA 8 5 8 TH BLACK SCREW WOOD 8X1 REFERENCE DESIGNATION SPEAKER OUTPUT JACK FAN RECTIFIER GND 037998 SR6520P 037999 5 8520 FAN RECTIFIER MNT POWER SWITCH SPEAKER JACK SPEAKER JACK OUTPUT JACKS COMPLETE CABINET COMPLETE CABINET COMPLETE CABINET COMPLETE CABINET YS eww STEEL 18GA RUBBER RUBBER SPRING STEEL HANDLE MOUNTING HANDLE MOUNTING CORNER MOUNTING GLIDE MOUNTING _ KA PART 031882 029821 026201 069393 038531 033542 041875 041092 031184 029828 9904101110 017439 036496 031707 033210 9904300900 MISCELLANEOUS DESCRIPTION CLIP W ADHESIVE EYELET RFLNGD 215 OD 315 L GROMMET RUBBER NUT 6 32 HEX EXT LOCK OWNER S MANUAL SR6520P 8520P REVERB UNIT 4 SPRING 4BB3S1D DIGITAL REVERB CONTROL PCB ASSY DIGITAL REVERB PCB SCREW M 6 32X1 4 PHPS BLX SCREW PB 8X3 4 PHP ZI SCREW PB 8 5 8 PHP SCREW SMA 6X1 2 PHP BLX SCREW TF 10 32X1 1 2 PHP BLX TRANSFORMER POWER TRANSFORMER POWER WASHER FLAT 1 4X1 STEEL BLX PARTS LIST REFERENCE DESIGNATION RIBBON CABLE MOUNT REVERB PAN MOUNTING REVERB PAN MOUNTING XFORMER GND WIRE PAN SR6520 8520 P SR6520PD 8520PD SR6520PD 8520PD XFORMER GND WIRE REVERB PAN MOUNTING FRONT REAR PANEL MT TRANSFORMER MOUNT DOMESTIC 120V 100V 220V 240V TRANSFORMER MOUNT _ P
18. TARY PROPRIETARY DOCUMENT CONTAINS CHECKED BY S THE PROPERTY OF THE DATE 22 9 Sow 2 s BE USED APPROVED ME Te i DATE 22 ERS ER 28 SIZE prawn 027 DRAWING NUMBER REV E MUSICAL INSTRUMENTS 2621 Research Drive Corona 91720 USA CREATED 4 007 94 SCALE PLOTTED 10 8495 5 1 1 2 1 soe 5 20 5 an 1995 FENDER PAE 280 0 09 r515 lt lt RGIS Hor Ps Tan Nor CT o i 2 gl 5 oe ah ax i 2 ey 1 550 A N rere lt lt 5 E Bits een eles E ed i Eoi FILM DWG DATABASE 1_Z296P1 DBE 11 CHIP ee Bai lend 5815 Qu 8 T lt DATE 13 JAN 95 10 LAYERS PLOTTED 1234 1 Oe gl 1 Pare frev _________ oare aeproven PROGG O me ae 7 jif wae Ep FF Go BID DATABASE TE m CHECKED MION YS MUSICAL INSTRUMENTS E ay me FOE emer SERVICE SERVICE DIAGRAM ues 00 pee SRBS2PD PREAMP 45 50 B DRAWING NUMBER T 10107 NEXT HIGHER
19. VOLT UNITS 11 IS CONNECTED 518 5 USING BLACK WIRE SUPPLIED IN THESE VERSIONS ON EXPORT UNITS TRANSFORMER VIOLET 15 CONNECTED TO CPG AND VIOLET WHITE IS CONNECTED TO 751 AND ELIMINATES THE WHITE WIRE USED IN DOMESTIC UNITS _PROPRIETARY SRPWRS 1 PROPRIETARY pate APPROVED MUSICAL INSTRUMENTS DASHED LINES INDICATE CONNECTION BLUE TRANSFORMER WIRES IN time SCHEMATIC POWER SR MIXERS EXPORT UNITS ONLY 0033221000 44 48 5 DRAWING WARMER s 0327861 wiRe3__ 2 ALTERNATE EXPORT POWER TRANSFORMER T 633210 ASSEMBLY NOTES 1 ASSUME ALL CP AND INSTANCES ARE INSTALLED WITH THE FOLLOWING EXCEPTIONS 1 1 ON EXPORT UNITS DELETE 24 AND 25 1 2 ON DOMESTIC UNITS DELETE CPS 12 14 21 CP23 2 AND 2 WIRE SETS sev sees ezer ene 518 51 cP14 518 5 erie sind 181 ces 26 an tae fwa fia ina BY SINGLE A SINGLE WIRE BETWEEN ONE TERMINAL 751 7 CONNECTION OF THE REMAINING TERMINAL 751 AND CPS IS ACCOMPLISHEB WITH THE VIOLET ANO VIOLET WHITE LEADS INCLUDED ON EXPORT TRANSFORMER 033212 I
20. 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 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 volts Q4 is the current source for the Differential Amplifier Q2 Q3 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 resistors R12 amp R13 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 R15 27K is the feedback resistor and R14 1K is the pull down resistor Rfb Av Therefore 27K 1K 1K 28K 1K 28 Av CIRCUIT DESCRIPTION Cont 7 amp Q11 make up a voltage amplification stage Again to operate properly the same amount of current must flow through these transistors Thus the voltage drop across R21 amp R22 must be the same Adjustable bias is provided by Q8 amp it s associated components 1 2volts is provided to the Base of Driver Transistors
21. bbon cable via P1 pin 6 to the attack release circuit The negative voltage drives through Diodes CR34 CR37 and charges Capacitors C26 C29 all at once in parallel as a one pole filter through a single time constant of R52 X C26 27 28 29 or 3 9K X 8 8uF 34 3ms As they charge Q29 turns on and provides current to pin 5 of the OTA U2 The current controls the output amplitude of U2 The inverted signal from U2 mixes with the input to U1B providing cancellation which reduces the input to the power amplifier This prevents the amplifier from clipping When the output of the power amplifier is reduced the output of U1A toggles back to 15vdc Due to the blocking action of Diodes CR34 CR37 Capacitors C26 C29 are forced to discharge as a 4 pole filter with different time constants through R58 R62 prevents Parasitic oscillation while Zener CR38 provides 2 slopes which results in smoother limiting When the power amplifier approaches clipping on a negative swing R46 is pulled low turning on Q26 which pulls up the Base of Q27 transferring 15 vdc to the collector JFET Q1 and associated components provide a 4 5 second turn on delay for the audio input to the power amplifier When the power is switched on Capacitor C3 charges through Resistor R4 The negative Gate voltage pinches off the JFET removing the ground from the input of the amplifier When the power is switched off C3 immediately discharges through Diode CR1 grounding the input of the
22. nches 70 2 cm 12 inches 30 5 cm 12 inches 30 5 cm 40 0 Ibs 18 2 kg 42 Ibs 19 1 kg CIRCUIT DESCRIPTION POWER AMPLIFIER The signal from the preamp feeds from P1B pin 4 through a ribbon cable to P1A on the power amplifier PCB The signal couples via C1 to the unity gain amplifier U1B U1B contains a closed loop gain of 1 negative feedback path along with positive feedback through the inverting Operational Transconductance Amplifier 02 U1B and U2 make up the gain reduction circuit for the DELTACOMP clip protection feature The attack and release circuit for the DELTACOMP is made up by the Diode Resistor and Capacitor network which drives the of 029 Comparator senses the voltage from the Collectors of 027 amp 028 When the power amplifier approaches clipping on a positive swing the collector of Q9 pulls up R50 which turns on Q28 transferring 15vdc to the collector pulling down R52 This causes the output 1 of to switch from 15vdc to 15vdc lighting the DELTACOMP Clip Led Note when the DELTACOMP is disabled the Led indicates clipping of the output stage With the DELTACOMP enabled the Led indicates an active DELTACOMP circuit The negative control voltage from R52 also feeds through P1A to P1B on the preamp PCB The voltage is routed to the DELTACOMP switch S1 located on the front panel With the switch engaged the control voltage is sent back through the ri
23. preiie 587 8 6 25 89 189K 1 28 age 18 MAIN MAIN D 5 got D R183 ig R41 J4 18VDC 47K 4 87 5 115 47K 1 R118 M 4 y5 E Ril FFECTS 1 100K 5 1 47K TO REVERS TO REVERB Asisv ASSY INPUT ASSY OUTPUT y R17 5 8 1K MONITOR SP3 5 5 5 1 5 C18 oUt ee R13 cg R15 2 903 SP4 5 6 2 267 17 _ gt 5 Was 32 2igMVAC 7 1 Ree 8 72 5 5 108K 18 7 MONITOR 4 5 POWER REG 50 1 47 R39 15VDC 2 come cia A 15 Loe R24 501 i A 1 R31 15K 125 2 TI 16000909000 PI gt 18K cag R23 K ex 69 8 1 17272 475 8 1 Res J B 51 518 7 58 58K V 15 0 4 R32 236 588 7 A NOTES UNLESS OTHERWISE SPECIFIED REF DES ITEM PART 0 DESCRIPTION 1 ALL RESISTORS 5 5 CIRCUITRY WITHIN DASHED LINES IS DATABASE FILE PROPRIETARY 2 ALL CAPACITORS 63 VOLT MINIMUM IDENTICAL FOR EACH CHANNEL SREPS DBF 3 ALL VOLTAGES READ TO GROUND WITH A D V M 6 INSTANCE NAMES IN EACH CHANNEL ARE KEYED THE
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