KXR_60_Service_Manual 电路图.pdf

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1、KXR 60 KEYBOARD EXTENDED RANGE SERVICE MANUAL CONTENTS: Notices Specifications Circuit Description Parts lists: PCB assembly Chassis assembly Cabinet assembly Miscellaneous Schematics/diagrams Fender Musical Instruments Corp. 7975 North Hayden Road Scottsdale, AZ 85258 RadioFans.CN 收音机爱 好者资料库 KXR 60

2、 KEYBOARD EXTENDED RANGE (This is the model name for warranty claims) SERVICE MANUAL MARCH 1996 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 mai

3、ntenance 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 po

4、st-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 me

5、an are as follows: CAPACITOR CODES HARDWARE CODES CAP AE=Aluminum ElectrolyticBLX=Black Oxide CAP CA=Ceramic AxialCR=Chrome Plated CAP CD=Ceramic DiskHWH=Hex Washer Head CAP MPF=Metalized Polyester FilmM=Machine Screw CAP MY=MylarNI=Nickel Plated CAP PFF=Polyester Film/FoilOHP=Oval Head Phillips PB=

6、Particle Board RESISTOR CODESPHP=Pan Head Phillips PHPS=Pan Head Phillips Sems RES CC=Carbon CompSMA=Sheet Metal A Point RES CF=Carbon FilmSMB=Sheet Metal B Point RES FP=Flame ProofSS=Stainless Steel RES MF=Metal FilmTF=Thread Forming RES WW=Wire WoundZI=Zinc Plated RadioFans.CN 收音机爱 好者资料库 KXR 60 SP

7、ECIFICATIONS Product Release No.:PR 299 (This is not a model number) POWER AMPLIFIER SECTION: Power output:50 Watts RMS Distortion at 50 Watts:Less than .1% 1kHz, before compression Less than 1% 1kHz, maximum compression Rated load impedance:8 Sensitivity:370 mV RMS Input impedance:33K DELTACOMP Ran

8、ge:20dB PREAMP SECTION: Input Impedance:36k Sensitivity for 50 watts:28 mV CHANNEL and MASTER VOLUME at maximum all tone controls at “0” Equalizer:Low +/- 12dB at 100Hz (shelving) Low Mid +/- 12dB at 338Hz High Mid +/- 12dB at 1188Hz High +/- 12dB at 4 kHz (shelving) DIMENSIONS:Height:22(55.9 cm) Wi

9、dth: 18(45.7 cm) Depth: 12(30.5 cm) Weight:46 lbs.(21 kg) Product specifications are subject to change without notice RadioFans.CN 收音机爱 好者资料库 KXR 60 CIRCUIT DESCRIPTION Preamp The Channel One input will accept a Balanced or Unbalanced signal via a ” Phone plug. U1B provides a gain of 1, and rolls of

10、f high frequencies at about 128kHz. The signal then couples to the second half of the input stage. Located within the negative feedback loop of U1A is the Channel One Volume control. It provides a minimum gain of 1, and a maximum gain of 15. At maximum gain, Capacitor C6 rolls off the high frequenci

11、es at about 47kHz. The input stage also features a function that shorts across the Volume control via a switch contact in the ” input jack. This causes U1A to remain locked into a Unity gain mode, disabling the Volume control, until a plug is inserted into the jack. This reduces noise in the input c

12、ircuitry. Channel Two is identical to Channel One. The two channels sum together to feed the Reverb Drive stage U3A, and the Summing Amp U4B. U3B senses the return signal from the Reverb Pan . R24 and C19 provide a slight boost in the high frequencies . R23 and C18 roll off low frequencies. This pro

13、duces a fairly bright reverb sound. To eliminate noise, C17 limits the high frequency response to about 5kHz. All ground connections in the Reverb circuitry are routed through a dedicated Reverb Ground trace to the Star Ground point on the circuit board. This eliminates any bleed through of noise in

14、to other audio ground paths. U4B sums the dry signal with the Reverb return signal and then drives the Equalizer circuit. Gyrators U5B, U6B, and U6A are used for the Low (100Hz), Low Mid (338Hz), and High Mid (1588Hz) bands. The High band uses a single pole shelving filter (R40,C31) at 4kHz. U5A per

15、forms the Boost/Cut function, and also drives the Effects Loop. The Tape in jacks are buffered by U7A and sum with the main signal just prior to the Effects Loop. The Effects Loop Send is capable of providing a pseudo balanced signal if desired. This helps to reduce noise and hum. The Effects Loop R

16、eturn will accept an Unbalanced or Balanced input. U7B buffers the signal from the Effects Loop, and drives the Master Volume control. R55 and C39 boost the low frequencies at 220Hz. Between the output of U7B and the Master Volume control, C40 and R56 boost high frequencies. The boost in Low and Hig

17、h frequencies provide a slight “Smile Curve” response. DELTACOMP U8B is a unity gain amplifier that drives the power amp stage. U9 (CA3080A) is an Operational Transconductance Amplifier (OTA). In conjunction with U8B, it acts as the gain reduction circuit for the Deltacomp. The attack/release circui

18、t for the DeltaComp contains the Diode, Resistor, and Capacitor network that drives the base of Q8 (MPSA63). Comparator U4A senses the output of the power amplifier. As the amplifier approaches clipping, the output of U4A toggles negative. The negative voltage through Diodes CR14-17 charges Capacito

19、rs C54-C57 all at once in parallel as a one-pole filter through a single time constant made up with R84. R84X (C54+C55+C56+C57) = 2.2K x 8.8uF = 19.4mSec. KXR 60 DELTACOMP (CONT) As the capacitors charge, the negative voltage at the base of transistor Q8 turns on this Darlington device. Current flow

20、s from the Collector of Q8 to pin 5 of U9. This current controls the output amplitude of U9. The inverted output from U9 mixes with the signal at the input of U8B (pin 5) causing cancellation, which reduces the input to the power amplifier. This prevents the amplifier from clipping. When the output

21、of the power amplifier is reduced, the Comparator toggles positive, removing the negative control voltage from the attack/release circuit. The blocking action of Diodes CR14-CR17 force Capacitors C54-C57 to discharge(Release) through a 4-pole filter with different time constants, through Resistor R8

22、5. Turn-on delay JFET Q7 and associated components provide a 2 - 3 second turn-on delay for the audio input to the power amplifier. Upon power-up, the negative16 volts charges Capacitor C45 through Resistor R64. The negative gate voltage pinches off the JFET, removing the ground from the input of th

23、e amplifier. When switching the power off, C45 immediately discharges through Diode CR1, grounding the input of the amplifier. TROUBLE SHOOTING 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

24、 times the JFET itself can be the culprit. NOTE: Excessive turn-off “Pops” can also be caused by uneven discharge fo 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

25、 even discharge to zero volts. Power Amplifier U10 is a high voltage op-amp (MC1436) that provides voltage gain for the power amplifier. Bootstrap Capacitors C47 and C48 sense the output through R104. This provides more voltage swing for the opamp with respect to the amplifier output. Diodes CR2 - C

26、R5 (BYV26D) make up the Fixed Bias circuit for the output transistors. The bodies of the Diodes mount 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 tem

27、perature. Pin 6 of U10 is at 0 Vdc. Therefore the Bias Diodes provide 2 voltage drops (1.2 volts) to the base of Darlington output Transisitors Q5 and Q6. Diodes CR6 - CR9 make up a voltage clamp protection circuit. If the bases of the output transistors reach 4.5 volts with respect to the output, t

28、he diodes will turn on, clamping the voltage. The output signal feeds through the Headphone Jack before driving the 15” speaker and dual piezo horn. Inserting a ” plug into the Headphone Jack will mute the speaker and horn. PARTS LIST PRINTED CIRCUIT BOARD ASSEMBLY QTY PART # DESCRIPTION REFERENCE D

29、ESIGNATION 4038690001CAP AE AX 1.0uF 100VC18,25,43,46 5026517001CAP AE AX 2.2uF 100VC45,54,55,56,57 1038692001CAP AE AX 10uF 35VC51 19009512001CAP AE AX 22uF 25V 20%C1,2,5,7,8,11,13-15,20,23,24,33-36,49,50,64 4049521000CAP AE AX 47uF 50VC47,48,62,63 KXR 60 PRINTED CIRCUIT BOARD ASSEMBLY (CONT) QTY P

30、ART # DESCRIPTION REFERENCE DESIGNATION 2031756CAP AE 4700uF 50VC60,61 11039256001CAP CA 68PF 100V LLC3,4,6,9,10,12,21,22,32,37,38 2039262001CAP CA 680PF 50VC17,30 1039266001CAP CA 3300PF 100V LLC16 1038702001CAP CA 6800PF 100V LLC28 103927001CAP CA 10000PF 50V 5% LLC31 3038703001CAP CA 1uF 50V LLC2

31、7,52,53 1033578003CAP PFF RDL .001uF 100V 10%C44 1033581003CAP PFF RDL .0033uF 100V 10%C41 1036234003CAP PFF RDL .015uF 100V 10%C26 3033591003CAP PFF RDL .033uF 100V 10%C39,40,42 1033592003CAP PFF RDL .047uF 100V 10%C19 1033594003CAP PFF RDL .056uF 100V 10%C29 1024854000CAP MPF RDL .1uF 400V 10%C59

32、1041501CAP MPF AX 2.2uF 100V 10%C58 1038656000CONTROL 10KBR25 (REVERB) 4038655000CONTROL 50KB W/CDR30-33 (EQUALIZER) 1038716000CONTROL 2K B SNAP INR58 (MASTER) 2037323000CONTROL SNAPIN 50K 15AR7,15 (VOLUME) 900626001DIODE 1N4448 75PRV SIGNAL LLCR1,6,9,12-17 2064089001DIODE 1N4003CR10,11 4029045000DI

33、ODE 6A 400V 6A4 LEAD FORMEDCR18-21 4028776000DIODE BIAS BYV26D LEAD FORMEDCR2-5 2027329001DIODE ZEN 1N5228B 3.9V 5% LLCR7,8 2028119000DIODE ZEN 1N5353B 16V 5W 5%CR22,23 13025802000FSTN TAB MALE .250X.032 PCB MTCP1-4,6-9,11-15 2026000001FSTN TAB MALE PCB MT .187X.032CP5,10 2025996000FUSE CLIP PCB .25

34、0 & 5MM FUSEXF1 1048827000FUSE QA 1-1/4X1/4 250V 2AF1 (100/120V ONLY) 1020789FUSE QA 20mmX5mm 250V 1AMPV1 (EXPORT 220/230/240V ONLY) 1027404000IC CA3080AE OTAU9 8016795000IC DUAL OP AMP TL072U1-8 1028047000IC OP AMP MC1436/SG1436YU10 2040903INSULATOR MICA TO-218Q5,6 5031570000JACK PHONE PCB STEREO P

35、REMIUMJ1,2,4,5,6 1025933000JACK PHONO DUAL PC MTGJ3 (TAPE IN) 2048466JACK RCA SINGLE PCB MOUNTJ7,8 (REVERB PAN CONNECT) 22020888001JUMPER WIRE 22GA 1028039000LED RED 5X5MM SBL-55VR3LD1 1049248003PCB ASSY KXR 60STUFFED 5024937001RES CF 1/4W 5% 110 LLR17,18,20,49,50 2024952001RES CF 1/4W 5% 100 LLR24,

36、61 10296060001RES CF 1/4W 5% 510 LLR48 8024965001RES CF 1/4W 5% 1K LLR23,42,46,62,65,72,73,78 4024971001RES CF 1/4W 5% 2.2 K LLR19,56,57,84 3024972001RES CF 1/4W 5% 2.7K LLR35,37,39 1029610001RES CF 1/4W 5% 3K LLR40 4024973001RES CF 1/4W 5% 3.3K LLR6,8,14,16 2024977001RES CF 1/4W 5% 4.7K LLR89,90 10

37、24979001RES CF 1/4W 5% 6.8K LLR92 2025942001RES CF 1/4W 5% 7.5K LLR71,74 11024981001RES CF 1/4W 5% 10K LLR43,44,45,60,79,81,82,85-88 2024986001RES CF 1/4W 5% 18K LLR29,41 12031818001RES MF 1/4W 1% 18.2K LLR1,2,3,5,9,10,11,13,51-54 2024987001RES CF 1/4W 5% 22K LLR27,55 3024989001RES CF 1/4W 5% 33K LL

38、R59,80,83 5024993001RES CF 1/4W 5% 47K LLR21,22,28,66 1024994001RES CF 1/4W 5% 56K LLR77 7024997001RES CF 1/4W 5% 100K LLR4,12,26,34,36,38,47 1024998001RES CF 1/4W 5% 120K LLR91 2025069001RES CF 1/4W 5% 1M LLR63,64 KXR 60 PRINTED CIRCUIT BOARD ASSEMBLY (CONT) QTY PART # DESCRIPTION REFERENCE DESIGNA

39、TION 1028861001RES CF 1/2W 5% 3.3K LLR103 3028045001RES FILM 1W 5% 220 LLR93,94,104 2028030001RES FILM 1W 5% 680 LLR67,70 4029722001RES FILM 1W 5% 1K LLR95-98 2028029001RES FILM 1W 5% 1.5K LLR68,69 2028028000RES WW BT 5W 10% .47R76,76 1048467RES WW BT 5W 10% 39R100 2029047000RES WW BT 7W 10% 270R101

40、,102 1048468RES WW BT 10W 10% 47R99 2027638000SCREW TF 4-40X3/8 HWHS ZI .1” HDQ5,6 2038900000SCREW TF 6-32X1/4 PHP ZIPCB TO HEATSINK MOUNT 2028169000WSHR SHLDR NYL 5/32/1/4Q5,6 1014689003XSTR N-CH JFET J111 TO-92Q7 1028114000XSTR NPN TIP 142 TO-218ACQ5 1014408003XSTR PNP DARLNGTON MPA 63 TO 92Q8 102

41、8115000XSTR PNP TIP 147 TO-218ACQ6 CHASSIS ASSEMBLY QTY PART # DESCRIPTION REFERENCE DESIGNATION 1007565BUSHING SR .625X.125X37/64 BLK POWER CABLE 100/120V ONLY 1010401BUSHING SR .625X.125X37/64 WHTPWR CABLE 230/240V ONLY 1026527CABLE ASSY PWR 120V .187 TABS100/120V ONLY 1026528CABLE ASSY PWR 230V .

42、187 TABS230V ONLY 1036479CABLE ASSY PWR AUST .187 TABS240V AUSTRALIA ONLY 1040992CABLE ASSY PWR 5A UK .187 TABS240V UNITED KINGDOM ONLY 1028560END BELL XFMR 85WTRANSFORMER MOUNT 1049977HEATSINK BAR KXR 60COUPLER TO CHASSIS 8048357KNOB CUSTOM BLK/OFF WHT 180 4028591NUT ACORN 8-32TRANSFORMER MOUNT 503

43、1647NUT HEX 12MMX1MM NIPHONE JACKS 10492520PANEL FRONT KXR 60 1049253PANEL REAR KXR 60 1041595SCREW 6-32X3/16 PHP STL ZI SEMS 6017433SCREW M 6-32X3/8 PHP BLXPCB MOUNT 1031868SCREW PLASTITE 4X1/4 PHP BLXRCA JACKS 3037988SCREW TF 8-32X1: HWH BLX 1025935SWITCH DPST .187 TAB (DOM)POWER SWITCH 4030007WSH

44、R LCK INTL 8X.330X.02 ZITRANSFORMER MOUNT 1027668XFMR PWR 120V 85W120V ONLY 1039357XFMR PWR EXP DELUXE 112100V/115V/230V CABINET ASSEMBLY QTY PART # DESCRIPTION REFERENCE DESIGNATION 1049251CAB ASSY KXR 60COMPLETE CABINET 1025722CABLE REVERB 1100MMREVERB CABLE 1022491CLAMP CABLE NYL SCRW MNT 5/16 .3

45、77026317CLOTH GRILLE BLACK PVC 6031867CORNER 2 HOLE W/ NOTCH BLK PWDRD 2031840CORNER 3 HOLE BLK PWDRD 4029821EYELET RFLNGD .15OD X.315 LREVERB PAN MOUNT 4027849GLIDE CAB 1.24X335 BLX WAXSTEEL ONLY , NO INSERT 1049251010GRILLE ASSY KXR 60COMPLETE GRILLE 1027846HANDLE 9.25” NO LOGORUBBER ONLY, NO INSE

46、RT 2031845HANDLE CAP 2 HOLE BLK PWDRD 1049260HORN CERAMIC PIEZO KXR 60 4019275INSERT GLIDE CUSHION 1.27 DIARUBBER ONLY 1032524INSERT HANDLESPRING STEEL 1029906NAMEPLATE FENDER GENERIC SMALLLOGO 4021972NUT T 10-32X3/4 STR 3 PRNG BLXSPEAKER MOUNT KXR 60 CABINET ASSEMBLY (CONT) QTY PART # DESCRIPTION R

47、EFERENCE DESIGNATION 1028055REVERB UNIT 800 8EB2C1B DNREVERB PAN 4017441SCREW M 10-32X1-1/2 OHP STL BLXSPEAKER MOUNT 4036199SCREW M 8-32X1-1/16 OHP BLX CPCHASSIS MOUNT 5029828SCREW PB 8X3/4 PHP ZIREVERB PAN MOUNT 49904101110SCREW PB 8X5/8 THP BLACK 2018113SCREW SMA 4X1/2 OHP BLXLOGO MOUNT 14026576SC

48、REW SMA 8X5/8 THP BLACKCORNER MOUNT 4017942SCREW WOOD 8X1 FHP BLXGLIDE MOUNT 4026577SCRW M 10-32X1 PHP BLX 1047539SPEAKER 12” 8 75W BXR 60 REF026570TOLEX BLACK LT WEIGHT 4029527WSHR FNSH 8-5/8 FLNGD BLX WXCHASSIS MOUNT MISCELLANEOUS QTY PART # DESCRIPTION REFERENCE DESIGNATION 1049254MANUAL OWNERS KXR 60 1049245SCHEM REDUCED KXR 60