Bassman_1200_Service_Manual电路图.pdf

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1、 BASSMAN 1200 (This is the model name for warranty claims) P/n 021-3300-010 (120V) SERVICE MANUAL CONTENTS: Notices Specifications Circuit description Parts lists: PCB assembly Chassis assembly End item Footswitch assembly Footswitch PCB Schematics Service diagrams Fender Musical Instruments Corp. 8

2、860 East Chaparral Road Suite 100 Scottsdale, AZ 85250 RadioFans.CN 收音机爱 好者资料库 BASSMAN 1200 (This is the model name for warranty claims) SERVICE MANUAL AUGUST 1998 IMPORTANT NOTICE: The information contained herein is CONFIDENTIAL and PROPRIETARY to Fender Musical Instruments Corp. It is disclosed s

3、olely 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 par

4、t 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

5、used in the description of certain parts. 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

6、=Nickel Plated CAP PFF=Polyester Film/FoilOHP=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 Formi

7、ng RES WW=Wire WoundZI=Zinc Plated RadioFans.CN 收音机爱 好者资料库 BASSMAN 1200 (This is the model name for warranty claims) SPECIFICATIONS Product Release No.:PR 513 (This is not a model number) Part Number:120V Version: 21-330010 240V Aus : 21-333010 230V UK : 21-334010 230V : 21-336010 100V JPN : 21-3370

8、10 110V TW : 21-331010 220V ROK : 21-339010 Preamp section Input impedance:470k Full power sensitivity: 12.75mV Tone controls:Treble: +/- 15dB 3kHz Bass: +/- 15dB 40Hz Graphic Equalizer:+/- 12dB 31.5Hz, 63Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz, 16kHz Mid notch:-20dB 700Hz Low boost:+10dB 40

9、Hz High boost:+10dB 6kHz Power Amplifier Section Power output:1200 Watts RMS into 2 0.2% THD Sensitivity:1V RMS (0dBV) Power Requirements:100V AC, 50/60 Hz, 1800W 120V AC, 60 Hz, 1800W 230V AC, 50 Hz, 1800W Speaker Complement:Designed for use with the Bassman 410 or Bassman 215 Bass Loudspeaker Encl

10、osures Dimensions:Height: 3.5(8.9 cm) Width:19.0(48.3 cm) Depth:15.0(38.1 cm) Weight:35 lbs(15.9 kg Product specifications are subject to change without notice RadioFans.CN 收音机爱 好者资料库 BASSMAN 1200 (This is the model name for warranty claims) CIRCUIT DESCRIPTION The Bassman 1200 Bass Amplifier employ

11、s many new technologies in various sections. This document is a brief overview. Preamp The preamp section employs two 12AX7 tubes. Channel one (V1) is fairly conventional, while channel two (V2) uses a second tube with additional op-amp gain (U2B) to provide a 60s style overdrive sound. The op-amp i

12、s used as straight gain and is never allowed to become non-linear. In typical operation, the drive channel and the clean channel are presented to the channel 1/2 mix control (R25) so that a blend can be established. The channel select button (S7) on the front panel (or its foot switch counterpart) s

13、elects between this channel mix or channel one only. This selection employs JFETS Q1-Q4. Signals are then presented to a second-order Sallen and Key filter set to F0 of 36.6 Hz and a Q of 2.1. This filter provides about 6.5dB of boost at 41 Hz. The signal path is routed to U4B where low-boost (S2) ,

14、 mid-notch (S4), and high-boost (S3) equalization switches can be used. These circuits are followed by conventional Baxendall low (R67) and high (R70) equalization. The Baxendall circuit output is then sent to a graphic equalizer which can be selected by the footswitch or graphic EQ button (S61) on

15、the front panel. The far-right graphic EQ slider (R660) is a +/- 10dB trim for graphic EQ gain compensation. Next, the signal is presented to a second-order state-variable filter before being presented to the compressor circuit. Said filter is set to 420 Hz. At the compressor, low-frequency compress

16、ion ratio (R88) and high-frequency compression ratio (R98) are adjustable to suit the user. Audio is presented to the compressor EQ balance (R107). The compressor EQ balance controls the mix ratios of the compressor outputs. A compressor gain trim (R113) is provided to compensate for the amount of a

17、mplification lost due to using the compressor. The compressor-gain trim control is able to compensate for a compressed signal of up to 10dB. The FETs Q5 and Q6 select between pre- and post-compressor via the front panel switch (S8) or footswitch. After passing through op-amp U10B and master-gain con

18、trol R116, the signal is sent to output jack J3, effects-loop send. The signal input at J4, effects-loop return, goes to differential receiver U11B. Signals are forwarded to power amp pass through amplifier U12B and on to J5. At these same nodes, the signal is passed on to the 1200 Watt class H powe

19、r amplifier. BASSMAN 1200 (This is the model name for warranty claims) Power Amplifier The power amplifier employs class AB topology in the pre-driver circuit Q8-Q11. Quiescent current is established with transistors Q12-Q13. Driver transistors Q16-Q17 provide drive for Q23-Q26, and Q31-Q34. Transis

20、tors Q19,Q21, and Q27-Q30 provide positive “on demand” supply-rail boost. Transistors Q20, Q22, and Q35-Q38 provide the same function for the negative rail. Transistor Q18 provides “charge depletion” of Q23-Q26 and Q31-Q34. This allows for the suppression of common mode current that can occur at hig

21、h frequencies. Relay K1 and associated components reduce output-stage current gain to unity during power-up and over-temperature events as monitored by thermistor RT1 on the main heatsink. Power supply Primary circuit inrush limiting is accomplished by TH1, a negative temperature coefficient thermis

22、tor. The power supply employs a toroidal power transformer with only one tapped-main secondary. Two large bridge rectifiers are used to obtain +/-47VDC and +/- 94VDC. High voltage (356VDC) for vacuum tube sections is generated by half-wave multiplier comprised of CR92-CR95, C125-C128. Low voltage (+

23、/-22VDC) and (+10 +28VDC variable fan) is supplied by the synchronous rectifier system located on the power supply break-away board. This synchronous system observes the input sine and allows Q81, Q85, and Q88 to be forced on until the input sine wave reaches the correct level as observed by Q83, Q8

24、7, and Q90. References Q84 (variably controlled by RT2) CR811 and CR818 are employed. Regulators U21 and U22 reduce the +/-22V lines to +/-16VDC Heater voltage (24VDC for 2 series-connected 12AX7s in the preamp) is derived from the 32VDC supply (+/- 16VDC). Excess voltage is dropped across across pa

25、ralleled ballast resistors, R354-R356, on the preamp PCB. BASSMAN 1200 (This is the model name for warranty claims) PARTS LIST NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY PRINTED CIRCUIT BOARD ASSEMBLY QTY PART # DESCRIPTION REFERENCE DESIGNATION 20052047000BRIDGE RECT 35A 800VBR1 BR2 90048451000BUTTO

26、N PUSH OFF WHITE 20053930000CABLE RIBBON 3 CKT 3 inP1A P5A 10048914000CABLE RIBBON 8 CKT 7 inP4A 10054388000CABLE RIBBON 8 CKT 9 inP8A 20033606003CAP AE RDL .47UF 50V 20%C116 C640 30028494000CAP AE RDL 1000uF 35V 20%C802 C805 C809 20028476003CAP AE RDL 100UF 50V 20%C806 C810 60028463003CAP AE RDL 10

27、UF 50V 20%C39 C43 C46 C50 C55 C59 10028458003CAP AE RDL 1UF 50V 20%C53 100028459003CAP AE RDL 2.2UF 50V 20%C24 C34-35 C52 C57 C81-83 C85 C88 20054204000CAP AE RDL 22UF 450V 20%C130-131 370028467003CAP AE RDL 22UF 50V 20%C1-2 C7 C19 C23 C40 C48 C51 C56 C61 C64-66 C69 C72-74 C76 C105 C134 C137 C601 C6

28、03-613 C634 C636 C638-639 40028460003CAP AE RDL 4.7UF 50V 20%C12-13 C28 C161 20053955003CAP AE RDL 47UF 160V 20%C92-93 40054206000CAP AE RDL 47UF 350V 20%C125-128 10054205000CAP AE RDL 47UF 450V 20%C129 60047195003CAP AE RDL 47UF 63V 20%C4 C86 C98-99 C803 C807 20037182000CAP AE RDL 6800UF 63V 20%C12

29、1-122 20053915000CAP AE100V10000uF 20%C123-124 10039261001CAP CA 330PF 100VC80 340034788003CAP CD .1UF 50V 20% .15CUTC644-649 C94-95 C132-133 C135-136 C139-160 30051457003CAP CD 100pF 500V 5%C100-101 C637 20051960003CAP CD 180 PF 500V 10%C14 C20 90051406003CAP CD 220PF 500V 10%C25 C45 C62-63 C67-68

30、C70-71 C641 40051445003CAP CD 22PF 500V 5%C18 C49 C54 C58 30051409003CAP CD 68pF 500V 5%C16 C60 C89 20027255003CAP MPF .001UF 100VC5 C11 30027257003CAP MPF .0022UF 100VC44 C47 C87 10027260003CAP MPF .0039UF 100VC79 50027261003CAP MPF .0047UF 100VC38 C84 C96-97 C162 20027262003CAP MPF .0068UF 100VC41

31、-42 20027264003CAP MPF .01UF 100VC602 C635 BASSMAN 1200 (This is the model name for warranty claims) PARTS LIST NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY PRINTED CIRCUIT BOARD ASSEMBLY (CONT) QTY PART # DESCRIPTION REFERENCE DESIGNATION 10047165000CAP MPF .01UF 250VC138 90027267003CAP MPF .022UF 100

32、VC31-33 C622-627 90027272003CAP MPF .047UF 63VC26-27 C75 C107-108 C114-115 C642- 643 10027275003CAP MPF .068UF 100VC30 10027277003CAP MPF .082UF 100VC17 60027280003CAP MPF .15UF 63VC616-C621 140027278003CAP MPF .1UF 63V 10%C3 C6 C10 C29 C36-37 C106 C109-111 C113 C801 C804 C808 10027281003CAP MPF .22

33、UF 63VC112 40027283003CAP MPF .33UF 63VC77-78 C614-615 10027286003CAP MPF .47UF 63VC117 30024853000CAP MPF RDL .1UF 250V 10%C118-120 50024854000CAP MPF RDL .1UF 400V 10%C8 C9 C15 C21 C104 10024823000CAP MPF RDL.01uf 400v 10%C22 60030937003CAP PFF RDL .0027UF 50V 5%C628-633 110050514000CONTROL SLIDER

34、 30MM 50KWR607-616 R660 30027945000CONTROL SNAPIN 100K B TAPERR113 R88 R98 10053926000CONTROL SNAPIN 10K 5A 10K 5CR107 10053929000CONTROL SNAPIN 10K B 250K BR25 20039053000CONTROL SNAPIN 1M 30AR20 R47 10053928000CONTROL SNAPIN 250K 30A TAPERR37 20031087000CONTROL SNAPIN 25K 2B W/DETENTR67 R70 100279

35、41000CONTROL SNAPIN 50K B TAPERR116 150064089001DIODE 1N4003 LLCR44-45 CR103-104 CR801-802 CR805-808 CR812-815 CR819 40026730001DIODE 1n4006 800v LLCR92-95 720006260001DIODE 1N4448 SIGNAL LLCR3-27 CR38-39 CR50-53 CR60 CR62- 85 CR87-88 CR96-100 CR601-603 CR803-804 CR809-810 CR816-817 40054209001DIODE

36、 1N5817 1ACR36-37 CR42-43 20029045000DIODE 6A 400V 6A4 LEAD FORMEDCR58-59 120025821001DIODE HV FDH-400 SWITCHING LLCR28-35 CR46-47 CR54-55 20052050000DIODE MUR1520 200PRV 15AMPCR56-57 10041261000DIODE VOLT REF LM4040DIZ-10.0U15 20009165001DIODE ZEN 1n4744a 15v 1w 5%CR90-91 10027329001DIODE ZEN 1n522

37、8b 3.9v 5% LLCR86 40027327001DIODE ZEN 1n5234b 6.2v 5% LLCR40-41 CR101-102 10029898001DIODE ZEN 1N5236B 7.5V 5%CR89 50031635001DIODE ZEN 1n5240b 10v 5% LLCR1-2 CR48-49 CR61 20038686001DIODE ZEN IN4737A 7.5V.5W 5%CR811 CR818 BASSMAN 1200 (This is the model name for warranty claims) PARTS LIST NOTE: S

38、HADED ITEMS ARE FOR REFERENCE ONLY PRINTED CIRCUIT BOARD ASSEMBLY (CONT) QTY PART # DESCRIPTION REFERENCE DESIGNATION 110025802000FSTN TAB MALE .250 x .032 PCB MTCP1-11 20025996000FUSE CLIP PCB .250 5MM FUSEXF1 10053654000GASKET HEATSINK 1200S 10027408000HDR .1 CTR 2 CKT SQ PINP9 20027410000HDR .1 C

39、TR 3 CKT SQ PINP1 P5 20027416000HDR .1 CTR 8 CKT SQ PINP4 P8 10053864000HEATSINK DRVR 1200S FRNT 10053865000HEATSINK DRVR 1200S REAR 10053488000HEATSINK MAIN SUNN 1200S 10053866000HEATSINK RECTIFIER 1200S 20025796000HEATSINK TO-220 170051198000IC DUAL OP AMP BA4560N SIPU5-7 U11-13 U16-17 U19-20 U61-

40、67 70016795000IC DUAL OP AMP TL072U1-4 U9-10 U14 10051680000IC DYNAMIC RANGE PROCESSOR DUAL VCA SSM2120 U8 10013562000IC REGULATOR 15V MC7815CTU21 10013564000IC REGULATOR 15V MC7915CTU22 10051856000IC QUAD 2-IN NAND GATE 4011U18 10027387000INDUCTOR AIR CORE RDL 2.5UHL1 40017974000INSULATOR MICA TO-2

41、20 200038815000INSULATOR SILICONE TO-3P 10051006000JACK 1/4 PCB DUAL TIP MONOJ1 20051658000JACK MONO R/AJ2 J12 40029175000JACK PHONE 1/4 HI CURRENT PCJ8-11 40053450000JACK STEREO RAJ3-6 10049892000JACK XLR MALEJ7 40028039000LED RED 5x5MM SLB-55VR3LD3-5 LD61 20053951000LED RED, T-1.75 ClrLD1-2 100331

42、77000LED RED/GREEN 5x5mm BI-COLORLD6 10053616000PCB MAIN SUNN 1200S 10036613000RELAY DPDT DIP 24 VOLT 8.3mAK1 20026505001RES CF 1/2W 5% 1 OHM LLR813 R819 30026368001RES CF 1/2W 5% 100 OHMR3-5 40025116001RES CF 1/2W 5% 100KR18 R23 R36 R44 40026493001RES CF 1/2W 5% 2.7K LLR238 R244 R268 R675 300265120

43、01RES CF 1/2W 5% 3.9K LLR802 R809 R815 20025941001RES CF 1/2w 5% 560 ohm LLR6 R292 40024967001RES CF 1/4W 5% 1.2KR13 R22 R31 R637 BASSMAN 1200 (This is the model name for warranty claims) PARTS LIST NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY PRINTED CIRCUIT BOARD ASSEMBLY (CONT) QTY PART # DESCRIPTIO

44、N REFERENCE DESIGNATION 20028862001RES CF 1/4W 5% 1.3KR159-160 70024969001RES CF 1/4W 5% 1.5KR43 R58 R155-156 R179-180 R229 20025073001RES CF 1/4W 5% 1.5MR86 R96 20024937001RES CF 1/4W 5% 10 OHMR230 R301 20024952001RES CF 1/4W 5% 100 OHMR119 R130 180024997001RES CF 1/4W 5% 100KR12 R16 R33-34 R56 R12

45、2 R133 R135- 136 R140 R196-197 R228 R277-279 R282 R668 610024981001RES CF 1/4W 5% 10KR8 R10 R14 R24 R26 R28-29 R32 R38 R48 R50-51 R54 R60 R69 R72-74 R77 R79 R82-83 R89 R99 R106 R110 R115 R117-118 R120-121 R124-129 R131- 132 R137 R141 R157-158 R236 R241 R253 R265 R276 R285 R290 R601-606 R657-658 R664

46、-665 R671 10024998001RES CF 1/4W 5% 120KR21 30024983001RES CF 1/4W 5% 12KR143 R188-189 20029539001RES CF 1/4W 5% 13KR61-62 50024999001RES CF 1/4W 5% 150KR41 R95 R251 R256 R271 40024985001RES CF 1/4W 5% 15KR642 R647 R651 R656 20024986001RES CF 1/4W 5% 18KR633 R638 110024965001RES CF 1/4W 5% 1KR17 R93

47、 R103 R151 R153 R646 R655 R803-804 R811 R817 180025069001RES CF 1/4W 5% 1MR9 R15 R27 R30 R39 R59 R64 R94 R104 R139 R240 R246 R270 R274 R302-303 R670 R673 60024971001RES CF 1/4W 5% 2.2KR235 R248 R257 R652 R810 R816 10025075001RES CF 1/4W 5% 2.2MR289 50029455001RES CF 1/4W 5% 2.4KR87 R97 R198-199 R634

48、 10024942001RES CF 1/4w 5% 22 ohm LLR806 60024956001RES CF 1/4W 5% 220 OHMR90-91 R100-101 R123 R134 10025059001RES CF 1/4W 5% 220KR19 180024987001RES CF 1/4W 5% 22KR46 R52 R227 R242-243 R252 R261 R263-264 R266-267 R272 R286 R288 R661-662 R672 R674 20024988001RES CF 1/4W 5% 27KR144-145 10029005001RES

49、 CF 1/4W 5% 2KR643 70024973001RES CF 1/4W 5% 3.3KR40 R617-618 R620 R622-623 R625 20026504001RES CF 1/4W 5% 3.6KR65-66 40024975001RES CF 1/4W 5% 3.9KR192-193 R628 R640 40028865001RES CF 1/4W 5% 30KR639 R644 R648 R653 30025061001RES CF 1/4W 5% 330KR49 R262 R275 30024989001RES CF 1/4W 5% 33KR627 R630 R635 10024960