KXR_100_Service_Manual 电路图.pdf

《KXR_100_Service_Manual 电路图.pdf》由会员分享，可在线阅读，更多相关《KXR_100_Service_Manual 电路图.pdf（11页珍藏版）》请在收音机爱好者资料库上搜索。

1、KXR 100 KEYBOARD EXTENDED RANGE SERVICE MANUAL CONTENTS: Notices Specifications Theory of Operation Parts lists: Preamp Power Amp 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 K

2、XR 100 (This is the model name for warranty claims) KEYBOARD EXTENDED RANGE SERVICE MANUAL FEBRUARY 1995 REV A TYPE PR262 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

3、 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 recommende

4、d 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.

5、The codes and what they mean 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/Foil

6、OHP=Oval Head Phillips PB=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 RadioFa

7、ns.CN 收音机爱 好者资料库 KXR 100 SPECIFICATIONS Part Number:120V Version :22-8501 230V Version :22-8561 Power Amp Section Power output:80 Watts RMS Sensitivity:370mV RMS Input impedance:33K Rated Load Impedance:4 ohms Distortion at rated power:Less than .1% 1kHz, before compression Less than 1% 1kHz, maximu

8、m compression DELTACOMP range:20dB PREAMP SECTION: Input Impedance:XLR 10k ” phone 36 k Sensitivity for 80 watts:XLR 2.8 mV CHANNEL and MASTER” phone 28mV VOLUME at maximum all tone controls at “0” Equalization Range:Low+/- 12dB at 100Hz Low Mid+/- 12dB at 338Hz High Mid+/- 12DB at 1588Hz High+/- 12

9、dB at 4 kHz (shelving) Dimensions:Height:27 1/2(69.8 cm) Width: 20 1/2 (52.1 cm) Depth: 12(30.5 cm) Weight:55 lbs.(25 kg) Product specifications are subject to change without notice RadioFans.CN 收音机爱 好者资料库 KXR 100 THEORY OF OPERATION The Channel One input will accept a Balanced or Unbalanced signal

10、via a ” Phone plug or a 3 pin XLR connector. U1B provides a gain of 1 for the ” input, and a gain of 10 for the XLR input. A balanced low level microphone connected to Channel One, allows the KXR 100 to function as a small self contained Vocal and Instrument PA system. U1B also rolls off high freque

11、ncies at about 128kHz. 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 frequencies at about 47kHz. Channels Two and Three do not offer a low level XLR input

12、 Jack. They do offer a function that shorts across the Volume control via a switch contact in the ” input jack. This causes U2A and U3A 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 circuitry. The three

13、channels sum together and feed the Reverb Drive stage U4A and the Summing Amp U5A. U4B senses the return signal from the Reverb Pan. R70 and C47 provide a slight boost in the high frequencies, R29 and C20 roll off low frequencies. This produces a fairly bright reverb sound. To eliminate noise, C49 l

14、imits the high frequency response to about 5kHz. All ground connections in the Reverb circuitry are routed through a dedicated trace to the Star Ground point on the circuit board. This eliminates any bleed through of noise into other audio ground paths. U5A sums the dry signal with the Reverb return

15、 signal and then drives the Equalizer circuit. Gyrators U6B, U7B, and U7A are used for the low (100Hz), Low Mid (338Hz), and High Mid (1588Hz)bands. The High band uses a single pole shelving filter (R47, C34) at 4kHz. U6A performs the Boost/Cut function, and also drives the Effects Loop. The Effects

16、 Loop Send is capable of providing a pseudo balanced signal if desired. This helps to reduce hum. The Effects Loop Return will accept an Unbalanced or Balanced input. U5B drives the Record Out jacks, and the Master Volume control. R55 and C40 boost the low frequencies at 220Hz. This boost is not des

17、ired at the Record Out jacks. Therefore C41 and R56 remove the Low boost. This allows the Record Out to see the same signal as the input channels, plus any tone shaping from the Equalizer. Between the ouptput of U5B and the Master Volume control, C43 and R60 boost high frequencies. The boost in Low

18、and High frequencies provide a Smile Curve response. The signal and ground line from the Master Volume control feed through a Flex Jumper to U2A, which is on the Power Amp circuit board. Any Hum induced into the signal and ground line is canceled by the Common Mode Rejection at U2A. Using R71 and C6

19、0, U2A provides the high frequency pre-emphasis from about 1kHz on up. This prevents compressor “pumping” caused by very low frequencies. The increase in high frequencies prevents repetitive releases by the compressor when triggered by low frequencies. De-emphasis occurs just prior to the speaker co

20、nnections, on a small break-away circuit board that contains R72, R73, and C61. KXR 100 THEORY OF OPERATION (CONT) Deltacomp U2B is a unity gain amplifier that drives the power amp stage, and U3. U3 is an Operational Transconductance Amplifier (OTA). In conjunction with U2B, it acts as the gain redu

21、ction circuit for the Deltacomp. The attack/release circuit for the Deltacomp contains the diode, resistor, and capacitor network that drives the base of Q8. Comparator U4A senses the output of the power amplifier. As the amplifier approaches clipping, the output of U4A toggles negative. The negativ

22、e voltage charges capacitors C22 C25 all at once in parallel as a one-pole filter through a single time constant made up with R47. R47 x (C22+C23+C24+C25)=2.2k x 8.8uF=19.4mSec. As the capacitors charge, the negative voltage at the base of transistor Q8 turns on this Darlington device. Current flows

23、 from the collector of Q8 to pin 5 of U3. This current controls the output amplitude of U3. The inverted output from U3 mixes with the signal at the input of U2B (pin 5) causing cancellation, which reduces the input to the power amplifier. This prevents the amplifier from clipping. When the output o

24、f the power amplifier is reduced, the comparator toggles positive, removing the negative control voltage from the attack/release circuit. The blocking action of diodes CR24 CR27 force capacitors C22 C25 to discharge (release) through a 4-pole filter with different time constants, through resistor R4

25、6. 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, capacitor C21 charges through resistor R40. The negative gate voltage pinches off the JFET, removing the ground from the input of the amplifier. When switc

26、hing the power off, C21 immediately discharges through diode CR23, 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 is appliied to the input. Many times the JFET itse

27、lf 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 scop input and check for even discharge to ze

28、ro volts. U1 is a high-voltage op-amp that provides voltage gain for the power amplifier. Bootstrap capacitors C1 and C2 sense the output through R6. This provides more voltage swing for the op-amp with respect to ground. Diodes CR5 CR8 (BYV26D) make up the fixed bias circuit for the output transist

29、ors. 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 temperature. Pin 6 of U1 is at 0Vdc. Therefore the bias diodes provid

30、e 2 voltage drops (1.2V) to the base of Darlington transistors Q1, Q2, Q5, Q6. Diodes CR32 CR35 make up a voltage clamp protection circuit. If the bases of the output transistors reach 4.5 volts with respect to the output, the diodes will turn on, clamping the voltage. The output signal feeds throug

31、h the Headphone Jack to the 1kHz de-emphasis circuit, before driving the 15” speaker and dual piezo horn. KXR 100 PARTS LIST PREAMP PRINTED CIRCUIT BOARD ASSEMBLY QTY PART # DESCRIPTION REFERENCE DESIGNATION 1047755PCB ASSY KXR 100 PREAMP(STUFFED) 1047974CABLE RIBBON ASSY 9 CKT 8 INCH(P1,95) 2038690

32、CAP AE AX 1.0UF 100VC20,28 3038692CAP AE AX 10UF 35VC48 17009512CAP AE AX 22UF 25V 20% C1,2,5,7,8,11,13,14,17,21,22,25,26,35,36,37, 42 14039256CAP CA 68PF 100VC3,4,6,9,10,12,15,16,18,23,24,27,38,39 1038703CAP CA .1uF 50VC30 1039270CAP CA 10000PF 50V 5%C34 1039266CAP CA 3300PF 100VC19 2039262CAP CA 6

33、80PF 50VC33,49 1033586CAP PFF RDL .0068uF 100V 10%C31 1033590CAP PFF RDL .022uF 100v 10%C41 2033591CAP PFF RDL .033UF 100V 10%C43,40 1033592CAP PFF RDL .047UF 100V 10%C47 1036234CAP PFF RDL .015UF 100V 10%C29 1038656CONTROL 10KBR31 (REVERB) 1038716CONTROL 2K B SNAP INR61 (MASTER) 4038655CONTROL 50KB

34、 W/ CDR36-39 ( EQUALIZER) 3037323CONTROL SNAPIN 50K 15AR8,16,24 4025802FSTN TAB MALE.250X.032 PCB MTCP1-4 7016795IC DUAL OP AMP TL072U1-7 6031570JACK PHONE PCB STEREO PREMIUMJ1,3-6,8 (INPUTS EFF LOOP) 1025933JACK PHONO DUAL PC MTJ7 (RECORD OUT RCAS) 2048466JACK RCA SINGLE PCB MOUNTJ9,10 (REVERB IN/O

35、UT) 1029177JACK XLR FM PC MNTJ2 (INPUT #1,3 PIN) 23020888JUMPER WIRE 22GA.5X.175W1-20,22-24 1028039LED RED 5X5MM SLB-55VR3LD1 1047754PCB FAB KXR 100 PREAMP(RAW CIRCUIT BOARD) 2024937RES CF 1/4W 5% 10R68,69 1024942RES CF 1/4W 5% 22R26 1024952RES CF 1/4W 5% 100R70 1024965RES CF 1/4W 5% 1KR29 2031819RE

36、S MF 1/4W 5% 1.82KR3,4 10024971RES CF 1/4W 5% 2.2K R7,9,15,17,23,25,27,49,50,60 3024972RES CF 1/4W 5% 2.7KR42,44,46 1029610RES CF 1/4W 5% 3KR47 1028861RES CF 1/2W 5% 3.3K R100 2024977RES CF 1/4W 5% 4.7KR57,58 2024986RES CF 1/4W 5% 18KR40,35 16031818RES MF 1/4W 1% 18.2KR1,2,5,6,10,11,13,14,18,19,21,2

37、2,51,25,53,54 2024987RES CF 1/4W 5% 22KR33,55 1024989RES CF 1/4W 5% 33KR56 3024993RES CF 1/4W 5% 47KR28,30,34 8024997RES CF 1/4W 5% 100KR12,20,32,41,43,45,48,59 4029722RES FILM 1W 5% 1KR64,65,66,67 2028045RES FILM 1W 5% 220R62,63 19904701440SPACER LED.7X.125BLUE POWER AMPLIFIER PRINTED CIRCUIT BOARD

38、 ASSEMBLY QTY PART # DESCRIPTION REFERENCE DESIGNATION 1047764KXR 100 PCB ASSY POWER AMP(STUFFED) 1038690CAP AE AX 1.0uF 100VC14 9028459CAP AE RDL 2.2uF 50V 20%C15-17,19,21-25 1038692CAP AE AX 10uF 35VC7 2028465CAP AE RDL 22uF 25V 20%C5,6 5028471CAP AE RDL 47uF 50V 20%C1,2,10,11,28 KXR 100 POWER AMP

39、LIFIER PRINTED CIRCUIT BOARD ASSEMBLY (CONT) QTY PART # DESCRIPTION REFERENCE DESIGNATION 2031756CAP AE 4700uF 50VC12,13 3027278CAP MPF .1uF 63V 10%C3,4 1041501CAP MPF AX 2.2uF 100V 10%C61 1024854CAP MPF RDL .1uF 400V 10%C46 1033578CAP PFF RDL .001uF 100V 10%C20 1033580CAP PFF RDL .0022uF 100V 10%C6

40、0 1033591CAP PFF RDL .033uF 100V 10%C18 2064089DIODE 1N4003CR21,22 13006260DIODE 1N4448 SIGNALCR1,2,23-29,32,35 4029045DIODE 6A 400V 6A4 LEAD FORMEDCR17-20 4028776DIODE BIAS BYV26D LEAD FORMEDCR5-8 2027329DIODE ZEN 1N5228B 3.9V 5%CR33,34 2028119DIODE ZEN 1N5353B 16V 5W 5%CR13,14 2026000FSTN TAB MALE

41、 PCB MT.187X.032CP7,12 16025802FSTN TAB MALE.250X.032 PCB MTCP1-6,1-11,17-22 2025996FUSE CLIP PCB.250 ZO SE,S( GROUND LUG) 4027636SCRW TF 8-32X5/8 HWH BLX(HEATSINK TO CHASSIS MOUNT) 1025935SWITCH DPST .187 TABS1 (100/120V ONLY) 1039287SWITCH DPST .187 TAB GLOBALS1 (230/240V EXPORT ONLY) 4030007WSHR

42、LCK INTL 8X.330X.02 ZI(TRANSFORMER MOUNT) 1027668XFMR PWR 120V 85WT1 (DOMESTIC 120V ONLY) 1039357XFMR PWR EXP DELUXE 112T1 (100/115/230/240 ONLY) CABINET ASSEMBLY QTY PART # DESCRIPTION REFERENCE DESIGNATION 1047757CAB ASSY KXR 100 1047120CABLE REVERB 1450MM 1022491CLAMP ABLE NYL SCRW MNT 5/16 REF02

43、6317CLOTH GRILLE BLACK PBC 6031867CORNER 2 HOLE W/NOTCH BLK PWDRD 2031840CORNER 3 HOLE BLK PWDRD 4029821EYELET RFLNGD .215 OD X.315 L(REVERB PAN MOUNT) 1028885GASKET HORN DUAL PIEZO 4027849GLIDE CAB 1/24X.335 BLX WAX(NO INSERT) 1047757GRILLE ASSY KXR 100(COMPLETE GRILLE) 2048958HANDLE RECESSED(NEW S

44、TYLE ON EACH SIDE OF CABINET) 2031845HANDLE CAP 2 HOLE BLK PWDRD(OLD STYLE ON TOP) 1025884HANDLE INSERT 7.78”(OLD STYLE) (SPRING STEEL) 1025883HANDLE SHORT NO LOGO(OLD STYLE) (NO INSERT) 1028813HORN DRIVER DUAL PIEZO 4019275INSERT GLIDE CUSHION 1.27 DIA(RUBBER ONLY) 1011298NAMEPLATE FENDER SMALL(LOG

45、O) 1031669REVERB UNIT 800 8EB2C1D(MOUNTED INSIDE CABINET ON BOTTOM BENEATH INSULATION) 8026577SCRW M 10-32X1 PHP BLX(SPEAKER MOUNT) 4017441SCRW M 10-32X1-1/2 OHP STL BLX(HANDLE MOUNT, OLD STYLE) 4036199SCRW M 8-32X1-3/16 OHP BLX CP(CHASSIS MOUNT) 5029828SCRW PB 8X3/4 PHP ZI(REVERB PAN MOUNT) 2018113

46、SCRW SMA 4X1/2 OHP BLX(NAMEPLATE MOUNT) 14026576SCRW SMA 8X5/8 THP BLX(HORN/CORNER MOUNT) 8016627SCRW SMA 8X5/8 THP BLK(HANDLE MOUNT/NEW STYLE) 4017942SCRW WOOD 8X1 FHP BLX(GLIDE MOUNT) 1040580SPEAKER 15” 4 100W 4029527WSHR FNSH 8-5/8 FLNGD BLX WX(CHASSIS MOUNT) MISCELLANEOUS 1047761MANUAL OWNERS KXR 100 1047752SCHEM REDU KXR 100 1047753SRVC DIAG KXR 100 W PWR AMP