Fender_blues_junior_service_manual 电路图 维修原理图.pdf
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1、BLUES JUNIOR SERVICE MANUAL CONTENTS: Notices Specifications Theory of operation Parts lists: PCB assembly Chassis assembly Cabinet assembly Miscellaneous Schematics/Service diagram Fender Musical Instruments Corp., 8860 E. Chaparral Road Suite 100 Scottsdale, AZ 85250 收音机爱好者资料库 Ra d i o Fa n s .CN
2、BLUES JUNIOR SERVICE MANUAL NOVEMBER 1995 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 oth
3、ers 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
4、an asterick (*) 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
5、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=Particle Board RESISTOR CODESPHP=Pan Head Phillips PHP
6、S=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 收音机爱好者资料库 Ra d i o Fa n s .CN BLUES JUNIOR SPECIFICATIONS TypePR 295 Input impedance:1M
7、 ohm Power output:15 Watts R.M.S. 5% T.H.D Rated load impedance:8 Ohms Speaker complimentOne 8 ohm 12 Eminence, replica of Jenson P-10 Dimensions: Height:16inches(41 cm) Width:18inches(46 cm) Depth:9-13/16 inches(25 cm) Weight:31 lbs.(14 kg) THEORY OF OPERATION J1 is a high-sensitivity input with an
8、 input impedance of about 1M. V1B is the first gain stage which also contains the FAT switch. The FAT feature is activated by grounding the node between bypass capacitor C3 and R9. Via the FAT switch (S1) or the optional footswitch, the junction of R52 and R54 can be grounded. With zero volts applie
9、d to the gate of Q1, the JFET will essentially ground C3, activating the FAT feature. The output of V1B couples to the VOLUME control (R7). The VOLUME control is actually a preamp overdrive control that adjusts the level of distortion. C2 attenuates high frequencies and C1 attenuates low frequencies
10、 at high distortion settings. This takes the edge off the distortion and prevents the speaker from flapping. V1A provides a gain of about 40, and drives the tone control circuitry. After the tone controls, the signal is fed to V2B, which drives the MASTER volume control (R41). From the MASTER volume
11、, the signal splits to feed the power amplifier and the Reverb. U1A makes up a typical solid-state reverb drive circuit. U1B is the reverb recovery or sense circuit, which drives the REVERB control (R51). The reverb signal is summed with the dry signal at C6, which couples to the input of the Phase
12、Inverter (V3). The output tubes (6BQ5/EL84) are arranged in a push-pull configuration that will produce fifteen (15 ) watts R.M.S. into eight (8) ohms 5% THD, 1kHz. The output bias is derived from the -15Vdc supply. The voltage divider at R31 & R37 determines the bias voltage (-10.7 Vdc). C14 filter
13、s the ripple to 1mV or less. 收音机爱好者资料库 Ra d i o Fa n s .CN BLUES JUNIOR PARTS LIST PRINTED CIRCUIT BOARD ASSEMBLY QTY PART # DESCRIPTION REFERENCE DESIGNATION 1049306001PCB ASSY BLUES JUNIOR ALL V(STUFFED) 1028104000BUTTON PUSH SWITCH BLACK( S1) 2047093000CABLE 6 CKT 3.2CJ1,3 3029533000CABLE JMPR 22
14、GA 4 CKT 3.2CJ2,4,5 1028577000CABLE REVERB 30( P1,2,3,4) 1038689001CAP AE AX .47F100VC23 3009512001CAP AE AX22F25V20%C3,4,21 3024819000CAP AE AX22F500VC10,17,18 1041589000CAP AE AX47F500V20%C15 1028474000CAP AE RDL100F25V20%C14 2028479000CAP AE RDL220F25V20%C29,30 2028489000CAP AE RDL470F50V20%C27,2
15、8 1039255001CAP CA10PF100VLLC24 1020909000CAP CD47PF1000V10%C33 1069724000CAP CD100PF1000V10% C&FC2 1020917000CAP CD250PF1000V10%C25 1020867000CAP CD330PF1000V10%C20 1017620000CAP CD1500PF1000V10%C35 1039265001CAP CA2200PF100VLLC22 2026202000CAP PFF.0022F600VC1,16 1033581000CAP PFF RDL .0033F100V10%
16、C26 1033588000CAP PFF RDL.01F100V10%C31 2024823000CAP MPF RDL.01F400V10%C6,34 1036234000CAP PFF RDL.015F100V10%C12 4024833000CAP MPF RDL.022F400V10%C8,9,11,13 1024839000CAP MPF.033F400VC19 2024853000CAP MPF RDL.1F250V10%C5,7 1024855000CAP MPF RDL.1F630V10%C32 1049402000CONTROL 25K B SNAPINR29 203471
17、9000CONTROL 50KB SNAP INR41,51 1041913000CONTROL SNAPIN 250K 10AR8 1040985000CONTROL SNAPIN 250K BR28 1049401000CONTROL 1M 10AR7 2064089001DIODE 1N4003 LLCR5,7 4026730001DIODE 1N4006 800V LLCR1,2,3,4 2006260001DIODE 1N4448 SIGNAL LLCR6,12 2029690001DIODE HV 3KV 200MA LLCR10,11 2009165001DIODE ZEN 1N
18、4744A 15V 1W 5%CR8,9 16025802000FSTN TAB MALE .250X.032 PCB MTCP1-13,16-18 2031041000FSTN TAB ML RTANG PCB .25X.032CP14,15 2025996000FUSE CLIP PCB .250 & 5MM FUSEXF1 1048827FUSE QA 1-1/4X1/4 250V 2AF1(100V/120V ONLY) 1020789FUSE QA 20mmX5mm 250V 1 AMPF1(230/240V EXPORT ONLY) 1016795IC DUAL OP AMP TL
19、O72U1 1030771JACK 1/4 PCB 2/CD SCCJ2 (SPEAKER JACK) 1027674JACK 1/4 PCB 2/CD SCC INSLJ3 (FOOTSWITCH JACK) 1037036JACK PHONE PCB MONO CA PREMIUMJ1 (INPUT JACK) 26020888001JUMPER WIRE 22GA .5W1-26 1048332LED RED PNL MT 7LD1 1049305PCB FAB BLUES JUNIOR(RAW BOARD) 1024947001RES CF 1/4W5%47LLR45 10249640
20、01RES CF 1/4W5%280LLR15 5024969001RES CF 1/4W5%1.5KLLR4,11,20,23,38 1029005001RES CF 1/4W5%2KLLR49 BLUES JUNIOR PRINTED CIRCUIT BOARD ASSEMBLY (CONT) QTY PART # DESCRIPTION REFERENCE DESIGNATION 2024977001RES CF 1/4W5%4.7KLLR16,46 1025942001RES CF 1/4W5%7.5KLLR26 1026510001RES CF 1/4W5%9.1KLLR18 302
21、4981001RES CF 1/4W5%10KLLR1,30,48 3024987001RES CF 1/4W5%22KLLR31,52,54 2024989001RES CF 1/4W5%33KLLR13,37 1028153001RES CF 1/4W5%75KLLR27 2024997001RES CF 1/4W5%100KLLR6,9 1024998001RES CF 1/4W5%120KLLR44 1028955001RES CF 1/4W5%130KLLR5 3025059001RES CF 1/4W5%220KLLR21,22,42 1025061001RES CF 1/4W5%
22、330KLLR50 1025828001RES CF 1/4W5%430KLLR40 2025065001RES CF 1/4W5%470K LLR47,56 1029618001RES CF 1/4W5%910K LLR43 4025069001RES CF 1/4W5%1MLLR2,12,14,53 2041741001RES MOX FP 1/2W 5%47R35,36 2028580001RES MOX FP 1/2W 5%100R24,25 1025829001RES CF 1/2W5%150LLR34 1031065001RES CF 1/2W5%91KLLR17 40251160
23、01RES CF 1/2W5%100KLLR3,10,19,39 2031067001RES FILM 1W5%750LLR57,58 2027349001RES FILM 1W5%10KLLR33,55 1041258RES CF 2W5%2.2KR32 1028091SWITCH PUSH SLFLK SHORT STROKES1 5029167TUBE SOCKET 9 PIN PCB MOUNTXV1-5 1014689XSTR N-CH JFET J111 TO-92Q1 CHASSIS ASSEMBLY QTY PART # DESCRIPTION REFERENCE DESIGN
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