Fender SR-6520 User manual

SR-6520 / SR-8520 /P / PD
POWERED MIXERS w/ DIGITAL EFFECTS
SR-6520P p/n 071-6521-100 (120V)
SR-8520P p/n 071-8521-100 (120V)
SR-6520PD p/n 071-6521-200 (120V)
SR-8520PD p/n 071-8521-200 (120V)
SERVICE MANUAL
CONTENTS:
Notices
Specifications
Circuit description
Parts lists:
Preamp PCB assy
Front panel assy
Pwr amp PCB assy
Rear panel assy
Cabinet assembly
Miscellaneous
Dig rev cntrl
Schematics
Service diagram
Fender Musical Instruments Corp.
7975 North Hayden Road Scottsdale, AZ 85258
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.
For warranty repair service, only Fender specified part numbers are to be used. It is recommended they also be used
for post-warranty maintenance and repair.
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!
A coded naming convention is used in the description of certain parts. The codes and what they mean are as follows:
CAPACITOR CODES HARDWARE CODES
CAP AE = Aluminum Electrolytic BLX = Black Oxide
CAP CA = Ceramic Axial CR = Chrome Plated
CAP CD = Ceramic Disk HWH = Hex Washer Head
CAP MPF = Metalized Polyester Film M = Machine Screw
CAP MY = Mylar NI = Nickel Plated
CAP PFF = Polyester Film/Foil OHP = Oval Head Phillips
PB = Particle Board
RESISTOR CODES PHP = Pan Head Phillips
PHPS = Pan Head Phillips Sems
RES CC = Carbon Comp SMA = Sheet Metal "A" Point
RES CF = Carbon Film SMB = Sheet Metal "B" Point
RES FP = Flame Proof SS = Stainless Steel
RES MF = Metal Film TF = Thread Forming
RES WW = Wire Wound ZI = Zinc Plated
1

SPECIFICATIONS
Type: PR 189
POWER AMPLIFIER SECTION:
Power output: 520 Watts R.M.S. @ 2 Ohms
350 Watts R.M.S. @ 4 Ohms
Distortion at 520 watts: Less than .2% @ 1 kHz into 2 Ohms
Minimum load impedance: 2 Ohms
Sensitivity: 1.28V R.M.S.
Input impedance: 22K ohm
DELTACOMP range: 20 dB
PREAMP SECTION:
Input impedance: LOW-Z 1.82k
HI-Z 18.2k
Hi-Z Input Sensitivity for 520 watts: 55 mV
(MAIN MASTER and CHANNEL
Main at maximum,all tone controls
and GEQ at "0" detent).
Channel tone controls: LOW +/- 15 dB at 100 Hz
MID +/- 15 dB at 750 Hz
HIGH +/- 15 dB at 10 kHz
Graphic equalizer: +/- 12 dB at 63, 125, 250, 500, 1k,
2k, 4k, 8k, and 16kHz.
Dimensions:
SR 6520PD SR 8520PD
Height: 10-7/16 inches (26.5 cm) 10-7/16 inches (26.5 cm)
Width: 23-5/8 inches (60.0 cm) 27-5/8 inches (70.2 cm)
Depth: 12 inches (30.5 cm) 12 inches (30.5 cm)
Weight: 40.0 lbs. (18.2 kg) 42 lbs. (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
(OTA) U2. 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 Base of Q29. Comparator U1A senses the voltage from the Collectors of Q27 & Q28. 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 (pin 1) of U1A 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 ribbon 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 8.8µF = 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 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 & 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 + Rpd ÷Rpd = Av. Therefore 27K + 1K ÷1K = 28K ÷1K
= 28 Av.
2

CIRCUIT DESCRIPTION Cont.
Q7 & 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 & R22 must be the same.
Adjustable bias is provided by Q8 & it's associated components. 1.2volts is provided to the Base of Driver Transistors
Q14 & 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 (.33Ω5 Watt) will dramatically increase. On the positive side of the amplifier, C11
charges through R25 & R27. On the negative side C12 charges through R31 & R32. This will cause Q12 & Q13 to turn
on. This limits the amount of signal which is available to the Base of the Driver Transistors (Q14 - Q17).
DIFFERENCES IN VERSIONS: In all versions (SR6520/8520, SR6520P/8520P, & 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
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).
PREAMP
PRINTED CIRCUIT BOARD ASSEMBLY
QTY PART # DESCRIPTION REFERENCE DESIGNATION
1037832 PCB. ASSY PREAMP SR6520P (STUFFED)
1037875 PCB. ASSY PREAMP SR8520P (STUFFED)
1049148 PCB ASSY PREAMP SR6520PD (STUFFED)
1049271 PCB ASSY PREAMP SR8520PD (STUFFED)
1 028577 CABLE ASSY REVERB 30" (SR6520/8520/P)
1 038534 CABLE, JUMPER 3CKT RIBBON P2 TO P3 (SR6520/8520/P TAPE IN)
1 048914 CABLE, RIBBON 8CKT RIBBON @ P1 (SR6520/8520PD)
1 028485 CAP AE RDL 16V 470uF 20% C11
1 028492 CAP AE RDL 16V 1000uF 20% C10
21 028465 CAP AE RDL 25V 22uF 20% C14,16,25,103,104,111
1 028474 CAP AE RDL 25V 100uF 20% C7
1 033605 CAP AE RDL 50V .15uF 20% C29
1 037943 CAP AE RDL 50V .33uF 10% C37
1 033606 CAP AE RDL 50V .47uF 20% C27
17 028459 CAP AE RDL 50V 2.2uF 20% C3,12,18-20,105,106
13 028460 CAP AE RDL 50V 4.7uF 20% C5,114,115
20 020909 CAP CD 1KV 47pF 10% C4,6,13,15,21-24,112,113
12 069724 CAP CD 1KV 100pF 10% C101,102
12 025984 CAP CD 1KV 180pF 10% C107,108
1 007029 CAP CD 1KV 220pF 10% C34
6 025986 CAP CD 1KV 390pF 10% C110
1 025777 CAP CD 1KV 470pF 10% C42
1 020842 CAP CD 1KV 500pF 10% C9
1 033588 CAP PF RDL 100V .01uF 10% C36
2 033578 CAP PF RDL 100V .001uF 10% C32,40
1 036234 CAP PF RDL 100V .015uF 10% C41
1 033590 CAP PF RDL 100V .022uF 10% C26
1 033591 CAP PF RDL 100V .033uF 10% C31
16 033596 CAP PF RDL 100V .068uF 10% C1,2,8,39,116,117
1 033579 CAP PF RDL 100V .0015uF 10% C30
1 033580 CAP PF RDL 100V .0022uF 10% C35
2 033581 CAP PF RDL 100V .0033uF 10% C17,38
3

PARTS LIST
PREAMP
PRINTED CIRCUIT BOARD ASSEMBLY (CONT)
QTY PART # DESCRIPTION REFERENCE DESIGNATION
1 033582 CAP PF RDL 100V .0039uF 10% C28
1 033583 CAP PF RDL 100V .0047uF 10% C43
7 033586 CAP PF RDL 100V .0068uF 10% C33,109
1 064089 DIODE 1N4003 CR2
1 006260 DIODE 1N4448 SIGNAL BENT CR1
1 027416 HEADER 8 PIN P1
21 016795 IC DUAL OP-AMP TLO72C U1-9,101,102
7 030771 JACK 1/4" PCB 2COND SCC J1,3-8
6 030987 JACK 1/4" PCB 3COND DOC J102
1 025933 JACK PHONO DUAL PC MOUNT J2 (RCA) (SR6520/8520/P)
1 049295 JACK RCA QUAD VERT PC MOUNT J2A,B (SR6520/8520 PD)
6 037248 JACK XLR FEMALE PC MOUNT J101
1 028098 LED 5X5mm GREEN SLB-55MG3 LD3
1 028039 LED 5X5mm RED SLB-55VR3 LD1
1 028097 LED 5X5mm YELLOW SLB-55YY3 LD2
1 031879 POT RTRY 50K 30A TAPER R6
23 031266 POT RTRY 50K B TAPER R8,19,22,29,30,117,120,122
18 033002 POT RTRY 50KB TAPER CNTR DT R110-112
9 031267 POT SLIDE 50KB 45mm CNTR DT R33-37,40-43 (SR6520/8520/P)
9 040534 CONTROL SL 60MM CSE 50K PANASONIC R33-37, 40-43 (SR6520/8520PD)
1 024942 RES CF 1/4W 22ohm 5% R2
1 024947 RES CF 1/4W 47ohm 5% R14
6 024965 RES CF 1/4W 1K 5% R11,15,21,24,28,46
2 024969 RES CF 1/4W 1.5K 5% R1,10
34 024971 RES CF 1/4W 2.2K 5% R25,48,50,52,54,56,58,60,62,64,
R109,115,116,119
2 024980 RES CF 1/4W 8.2K 5% R39,44
7 024981 RES CF 1/4W 10K 5% R3-5,12,13,32,38
1 024985 RES CF 1/4W 15K 5% R27
1 024987 RES CF 1/4W 22K 5% R31
23 024993 RES CF 1/4W 47K 5% R7,16-18,26,118,121,123
2 029613 RES CF 1/4W 91K 5% R55,63
10 024997 RES CF 1/4W 100K 5% R9,20,23,45,113
1 028549 RES CF 1/4W 110K 5% R53
6 024999 RES CF 1/4W 150K 5% R114
1 025058 RES CF 1/4W 180K 5% R61
2 025059 RES CF 1/4W 220K 5% R51,59
PARTS LIST
PREAMP
PRINTED CIRCUIT BOARD ASSEMBLY (CONT)
QTY PART # DESCRIPTION REFERENCE DESIGNATION
2 029450 RES CF 1/4W 240K 5% R47,57
1 025061 RES CF 1/4W 330K 5% R49
24 031819 RES MF 1/4W 1.82K 1% R101-104
24 031818 RES MF 1/4W 18.2K 1% R105-108
3 036375 SPACER RND NYL .147X.250X.720 (AT LD1-3)
5 033574 STANDOFF SWEDGE 4-40X.937
2 029904 SWITCH PUSHBUTTON PC MOUNT S1,2
1 027113 TERMINATION RING #6 18-14GA (CRIMPED ON GND WIRE)
.5ft 027182 WIRE 18GA BONDED BLACK (GND TO FOIL SHIELD)
1 016739 XSTR NPN 2N4401 TO-92 Q1
FRONT PANEL PREAMP ASSEMBLY
42 9904814100 BUSHING SNAP-IN (POT SHAFT)
1 033326 CABLE RIBBON 8 CIRCUIT (INTERCONNECT) (SR6520/8520/P
9 028939 KNOB,GRAPHIC EQUALIZER (SR6520/8520/P)
9 041109 KNOB EQ BXR SERIES (SR6520/8520PD)
2 028841 KNOB PUSHBUTTON
18 028797 KNOB RTRY DARK BLUE (LOW/MID/HIGH)
7 028800 KNOB RTRY LIGHT GRAY (LEVEL)
2 038511 KNOB RTRY SALMON 177C (MAIN REV,MON REV)
7 038513 KNOB RTRY RED 192C (MONITOR)
7 038514 KNOB RTRY PURPLE 265C (EFF/REV/SEND)
1 038515 KNOB RTRY GREEN BASIC (AUXILIARY)
18 041835 KNOB CTL DBL GRY/BLUE (LOW/MID/HIGH) SR6520P/8520P/PD
7 041833 KNOB CTL DBL GRY/WHT (LEVEL) SR6520P/8520P/PD
9 041836 KNOB CTL DBL GRY/BLK (MAIN REV, MON REV, MONITOR)
SR6520P/8520P/PD
7 041834 KNOB CTL DBL GRY/GREEN (EFF/REV/SEND) SR6520P/8520P/PD
1 041837 KNOB CTL DBL GRY/DK GRY (AUXILIARY) SR6520P/8520P/PD
13 038537 NUT JAM 3/8-32 BLK NYLON (1/4" INPUT JACKS)
1049153 PANEL FRONT SR6520PD 037786 = SR6520P
1049154 PANEL FRONT SR8520PD 037826 = SR8520P
5 014172 SCREW M 4-40X1/4 PHP BLX (PCB TO PANEL MTG)
13 037990 SCREW PLASTITE 6X3/8 PHP BLX (XLR/RCA JACKS)
13 038538 WASHER FW 3/8X5/8X3/32 BLK NYLON (1/4" JACKS)
4

PARTS LIST
POWER AMP
PRINTED CIRCUIT BOARD ASSEMBLY
QTY PART # DESCRIPTION REFERENCE DESIGNATION
1033310 PCB ASSY POWER AMP (120V)
1033311 PCB ASSY POWER AMP (220V/240V)
1033312 PCB ASSY POWER AMP (100V)
1032927 PCB SR6520P/SR8520P PWR AMP (BLANK BOARD)
8 028459 CAP AE RDL 50V 2.2uF 20% C1,2,5,24,26-29
2 028460 CAP AE RDL 50V 4.7uF 20% C3,10
2 028471 CAP AE RDL 50V 47uF 20% C22,23
3 025787 CAP AE RDL 16V 100uF 20% C6,11,12 (NON POLAR)
2 028494 CAP AE RDL 35V 1000uF 20% C16,17
2 025786 CAP AE RDL 80V 6800uF 20% C14,15
1 025970 CAP CD 1KV 5pF 10% C7
2 025982 CAP CD 1KV 68pF 10% C8,9
1 069724 CAP CD 1KV 100pF 10% C30
1 024854 CAP MPF 400V .1uF 10% C13
5 027278 CAP MPF 63V .1uF 10% C18-21,25
1 027257 CAP MPF 100V .0022uF 10% C4
6 064089 DIODE 1N4003 CR22-25,28,29
24 006260 DIODE 1N4448 SIGNAL BENT CR1,3-13,16,17,26,27,30-37
2 020534 DIODE 1N5402 RECTIFIER 200V CR20,21
4 025821 DIODE HV FDH400 SWITCHING CR14,15,18,19
1 031019 DIODE ZENER 1N5245B .5W 15V CR2
1 027329 DIODE ZENER 1N5228B 3.9V CR38
2 025996 FUSE CLIP PCB .250 & 5mm XF1 (100V/120V)
4 020775 FUSE CLIP PCB 5mm XF2,3 (220V/240V)
1 028330 FUSE QA 1-1/4X1/4 250V 10AMP F1 (100V/120V)
1 020798 FUSE QA 5mm 250V 5AMP F1 (220V/240V)
2 020789 FUSE QA 5mm 250V 1AMP F2,3 (220V/240V ONLY)
1 027416 HEADER .1 CTR 8 CKT SQ PIN P1
1 031269 HEATSINK SR SERIES (MAIN HEATSINK)
2 025796 HEATSINK TO-220 U3,4
1 027404 IC 3080EA OTA U2
1 016795 IC DUAL OP AMP TLO72C U1
1 027387 INDUCTOR AIR CORE RDL 2.5uH L1
PARTS LIST
POWER AMP
PRINTED CIRCUIT BOARD ASSEMBLY (CONT)
QTY PART # DESCRIPTION REFERENCE DESIGNATION
4 017974 MICA PAD TO-220 Q14-17
8 074211 MICA PAD TO-3 PRE-GREASED Q18-25
1 69904200200 NUT PEM 6-32 AT Q18-25
1 025674 POT TRIM LINEAR 30% 1.5K R20 (Bias adjust}
1 013562 REGULATOR +15V MC7815CT U3
1 013564 REGULATOR -15V MC7915 U4
1 024952 RES CF 1/4W 100ohm 5% R67
2 024956 RES CF 1/4W 220ohm 5% R21,22
2 024961 RES CF 1/4W 470ohm 5% R27,31
1 024963 RES CF 1/4W 680ohm 5% R57
7 024965 RES CF 1/4W 1K 5% R3,6,14,25,32,54,64
1 024967 RES CF 1/4W 1.2K 5% R19
4 024971 RES CF 1/4W 2.2K 5% R12,13,16,17
2 024975 RES CF 1/4W 3.9K 5% R18,52
1 024977 RES CF 1/4W 4.7K 5% R62
1 025942 RES CF 1/4W 7.5K 5% R10
6 024981 RES CF 1/4W 10K 5% R47,49,51,63,66,68
1 024985 RES CF 1/4W 15K 5% R55
2 024987 RES CF 1/4W 22K 5% R1,61
4 024988 RES CF 1/4W 27K 5% R7,15,28,29
2 024989 RES CF 1/4W 33K 5% R2,60
1 024993 RES CF 1/4W 47K 5% R59
5 024997 RES CF 1/4W 100K 5% R46,48,50,53,56
1 024998 RES CF 1/4W 120K 5% R65
1 024999 RES CF 1/4W 150K 5% R58
2 025069 RES CF 1/4W 1M 5% R4,5
4 033205 RES MF 1/4W 15ohm 5% R23,24,33,34 (fused)
4 036960 RES MF 1/4W 47ohm 5% R8,9,26,30 (fused)
1 031900 RES CF 1/2W 15K 5% R11
1 027627 RES FILM 1W 10ohm 5% R45
2 027628 RES FILM 2W 47ohm 5% R43,44
8 032958 RES WW 5W .33ohm 10% R35-42
1 032905 RES WW 10W 400ohm 5% R69
2 027638 SCREW TF 4-40X3/8" HWH ZI (AT U3,4)
5

PARTS LIST
POWER AMP
PRINTED CIRCUIT BOARD ASSEMBLY (CONT)
QTY PART # DESCRIPTION REFERENCE DESIGNATION
4 014171 SCREW M 4-40X3/8" PHP BLX (AT Q8,14-17)
14 033051 SCREW M 6-32X1/2" PHPS ZI (AT Q18,20-23,25)
(AND STANDOFFS)
4 037568 SCREW M 6-32X3/4" PHP ZI (AT Q19,24)
16 025805 SLEEVE INSULATING 3/16" (AT Q18-25)
4 036235 SPACER AL #6X1/4X1/4" (AT Q19,24)
2 025804 STANDOFF 6-32X1/2 RND AL (HEATSINK MOUNT)
1 029779 SWITCH THERMAL NC (OPEN 248oF) TS1 (CIRCUIT BREAKER)
1 032906 SWITCH THERMAL NO(CLOSE 194oF) TS2 (FAN HI/LO SPEED)
20 025802 TAB MALE .250X.032 PCB MT CP1-25
1 026411 THERMISTOR 2.5 ohm 8 AMP TH1
4 022376 WASHER FLAT 6X3/8 NI (AT Q19,24)
4 017746 WASHER SHOULDER NYL 1/8X1/4 (AT Q14-17)
1 014689 XSTR N-CH JFET J111 TO-92 Q1
1 025748 XSTR NPN 2SC1567 TO-126 Q8
3 016739 XSTR NPN 2N4401 TO-92 Q12,27,28
4 025751 XSTR NPN 2SC2362K TO-92 Q2,3,4,10
4 025744 XSTR NPN MJ15022 TO-3 Q18,20,22,24
1 014408 XSTR NPN MPSA63 TO-92 Q29
1 014867 XSTR NPN MPSU10 TO-202 Q11
2 027745 XSTR NPN NEC 2SC2336B TO-220 Q14,15
2 016742 XSTR PNP 2N4403 TO-92 Q13,36
3 025752 XSTR PNP 2SA1016K TO-92 Q5,6,9
4 025745 XSTR PNP MJ15023 TO-3 Q19,21,23,25
1 014866 XSTR PNP MPSU60 TO-202 Q7
2 027744 XSTR PNP NEC 2SA1006B TO-220 Q16,17
REAR PANEL
POWER AMP ASSEMBLY
1037883 POWER AMP ASSY 120V (DOMESTIC)
1 026038 BUSHING SR .625X.062X37/64 BLX (100/120V PWR CORD)
1 010401 BUSHING SR .625X.125X37/64 WHT (220/240V PWR CORD)
1 026541 CABLE ASSY POWER CORD (100V/120V)
1 033331 CABLE ASSY POWER CORD (220V/240V)
1 012473 FAN 115V 4-1/8"
1 033576 GASKET FAN 4.9X4.9
2 032900 JACK PHONE 1/4" HI CURRENT (SPEAKER OUTPUT)
PARTS LIST
REAR PANEL
POWER AMP ASSEMBLY (CONT)
QTY PART # DESCRIPTION REFERENCE DESIGNATION
2 016352 NUT HEX 3/8-32X3/32 TK NI (SPEAKER OUTPUT JACK)
6 069393 NUT HEX 6-32 EXT LOCK (FAN,RECTIFIER,GND)
1049155 PANEL REAR POWER AMP SR6520PD 037998 = SR6520P
1049156 PANEL REAR POWER AMP SR8520PD 037999 = SR8520P
1 032925 RECTIFIER BRIDGE DIODE
11 031184 SCREW M 6-32X1/4" PHPS BLX
5 015627 SCREW TF 6-32X3/4" PHP BLX (FAN/RECTIFIER MNT)
4 025804 STANDOFF 6-32X1/2" RND AL
1 026479 SWITCH ROCKER DPST (POWER SWITCH)
2 031153 WASHER FLAT 3/8X.614 NI (SPEAKER JACK)
2 9904300100 WASHER LCK INTL 3/8X.681X.032 ZI (SPEAKER JACK)
2 026401 WASHER SHLDR FIBER 3/8X5/8 (OUTPUT JACKS)
CABINET ASSEMBLY
1049150 CABINET ASSY SR6520PD (COMPLETE CABINET)
1049151 CABINET ASSY SR8520PD (COMPLETE CABINET)
1040951 CABINET ASSY SR6520P (COMPLETE CABINET)
1040952 CABINET ASSY SR8520P (COMPLETE CABINET)
8 031867 CORNER 2 HOLE W/NOTCH BLK PWDRD
4 027849 GLIDE CAB 1.24X.335 BLX (STEEL 18GA)
4 019275 GLIDE CUSHION INSERT (RUBBER)
1 027846 HANDLE 9.25" NO LOGO (RUBBER)
2 031845 HANDLE CAP 2-3/16" BLK PWDRD
1 032524 HANDLE INSERT (SPRING STEEL)
4 021972 NUT T 10-32X3/4 STR 3 PRNG BLX (HANDLE MOUNTING)
4 017393 SCREW M 10-32X1-1/8 OHP BLX (HANDLE MOUNTING)
12 026576 SCREW SMA 8X5/8" TH BLACK (CORNER MOUNTING)
4 026625 SCREW WOOD 8X1" FH (GLIDE MOUNTING)
6

PARTS LIST
MISCELLANEOUS
QTY PART # DESCRIPTION REFERENCE DESIGNATION
1 031882 CLIP W/ADHESIVE (RIBBON CABLE MOUNT)
4 029821 EYELET RFLNGD .215 OD X.315 L (REVERB PAN MOUNTING)
4 026201 GROMMET RUBBER (REVERB PAN MOUNTING)
1 069393 NUT 6-32 HEX EXT LOCK (XFORMER GND WIRE)
1 038531 OWNER'S MANUAL SR6520P/8520P
1 033542 REVERB UNIT 4 SPRING 4BB3S1D (PAN) (SR6520/8520/P)
1 041875 DIGITAL REVERB CONTROL PCB ASSY (SR6520PD/8520PD)
1 041092 DIGITAL REVERB PCB (SR6520PD/8520PD)
1 031184 SCREW M 6-32X1/4" PHPS BLX (XFORMER GND WIRE)
4 029828 SCREW PB 8X3/4" PHP ZI (REVERB PAN MOUNTING)
11 9904101110 SCREW PB 8X5/8" PHP (FRONT/REAR PANEL MT)
1 017439 SCREW SMA 6X1/2" PHP BLX
4 036496 SCREW TF 10-32X1-1/2" PHP BLX (TRANSFORMER MOUNT)
1 031707 TRANSFORMER POWER (DOMESTIC 120V)
1 033210 TRANSFORMER POWER (100V/220V/240V)
4 9904300900 WASHER FLAT 1/4X1" STEEL BLX (TRANSFORMER MOUNT)
PARTS LIST
DIGITAL REVERB CONTROL
PRINTED CIRCUIT BOARD ASSEMBLY
QTY PART # DESCRIPTION REFERENCE DESIGNATION
1041092 PCB UNIT DSP REVERB (DIGITAL EFFECTS UNIT W/OUT
CONTROL BOARD)
2 041818 BRACKET RT ANGLE (DIG REV CONTROL BOARD MNT)
1 041814 CABLE 10CKT X 101MM W/CONNECT @P3
1 041815 CABLE 12CKT X 101MM W/CONNECT @P2
2 038703 CAP CA .1µF 50V C4,5
1 027278 CAP MPF .1µF 63V 10% C11
1 027281 CAP MPF .22µF 63V C7
3 028461 CAP AE RDL 10µF 35V 20% C1,2,3
4 028465 CAP AE RDL 22µF 25V 20% C6,8-10
8 006260 DIODE 1N4448/1N914B SIGNAL CR1-8
2 041074 ENCODER 16 POS BI S1,2
1 041816 HEADER 8CKT RT ANG P1
1 028120 IC 4053B TPL 2 CHAN ANLG SW U5
1 031611 IC DUAL OP AMP PC4560 U4
2 041812 IC REGULATOR +5V MC7805CT U1,2
1 041813 IC REGULATOR -5V MC7905CT U3
1041878 PCB ASSY DIG REV CONTROL PX22 (STUFFED)
1041876 PCB FAB DIGITAL REV CONTROL (RAW BOARD)
3 024965 RES CF 1/4W 5% 1K R1,2,15
1 024971 RES CF 1/4W 5% 2.2K R4
2 024977 RES CF 1/4W 5% 4.7K R3,11
6 024981 RES CF 1/4W 5% 10K R6,7,8,9,13,14
2 024987 RES CF 1/4W 5% 22K R5,10
1 025081 RES CF 1/4W 5% 5.6M R12
1 025069 RES CF 1/4W 5% 1M
4 032908 SCRW TF 6-32X3/8 PHP ZI (PCB MOUNT)
3 016742 XSTR PNP 2N4403 TO-92 Q1-3
7