Bassman_300_(Rev.A)_Service_Manual电路图.pdf

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1、BASSMAN 300 p/n 021-3302-010 (120V) SERVICE MANUAL CONTENTS: Notices Specifications Circuit description Parts lists: PCB assembly Chassis assembly Cabinet assembly End item Footswitch assembly Footswitch PCB Schematics Service diagrams Fender Musical Instruments Corp. 8860 East Chaparral Road Suite

2、100 Scottsdale, AZ 85250 RadioFans.CN 收音机爱 好者资料库 BASSMAN 300 (This is the model name for warranty claims) SERVICE MANUAL December 2002 IMPORTANT NOTICE: The information contained herein is CONFIDENTIAL and PROPRIETARY to Fender Musical Instruments Co. It is disclosed solely for use by qualified tech

3、nicians 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

4、 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 cert

5、ain 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=Nickel Plated CAP PFF=Polyeste

6、r 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 Forming RES WW=Wire WoundZI=Zinc Pla

7、ted RadioFans.CN 收音机爱 好者资料库 BASSMAN 300 (This is the model name for warranty claims) SPECIFICATIONS Product Release No.:PR 512 (This is not a model number) Part Number:120V Version: 21-3302010 240V Aust : 21-3332010 230V UK : 21-3342010 230V : 21-3362010 100V JPN : 21-3372010 220V ROK : 21-3392010 1

8、10V TW : 21-3312010 230V ARG : 21-3352010 Power Requirements:All Versions: 900W Preamp Section Input impedance:470 k Full power sensitivity:12 mV Tone controls:Treble:+/- 15 dB 6kHz Bass:+/- 15 dB 40Hz Graphic equalizer:+/- 12 dB 31.5Hz, 63Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz, 16kHz Mid n

9、otch:-20 dB 700Hz Low boost:+10 dB 40Hz High boost:+10 dB 6kHz Compressor Crossover:400Hz Ratio:1:1 min to 4:1 max Line out level:+6 dB referenced to input (pre), 0 dBV (post) (Transformer balanced) Power amplifier section Input impedance:20 k Power output:300 Watts RMS into 2, 4, 0r 8 3% THD Sensit

10、ivity:1V RMS (0dBV) Speaker Complement:Designed for use with the Bassman 410H or Bassman 215 Bass Loudspeaker Enclosures Dimensions:Height:10.1(25.7 cm) Width:25.5(64.8 cm) Depth:15.6(40 cm) Weight:75 lbs.(34 kg) Product specifications are subject to change without notice RadioFans.CN 收音机爱 好者资料库 BAS

11、SMAN 300 (This is the model name for warranty claims) CIRCUIT DESCRIPTION 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 is used

12、 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 (R17) so that a blend can be established. The channel select button (S9) on the front panel (or its foot switch counterpart) selects

13、 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 U17B where low-boost (S3) , mi

14、d-notch (S2), and high-boost (S4) equalization switches can be used. These circuits are followed by conventional Baxendall low (R58) and high (R62) equalization. The Baxendall circuit output is then sent to a graphic equalizer which can be selected by the footswitch or graphic EQ button (S7) on the

15、front panel. The far-right graphic EQ slider (R71) 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 compression r

16、atio (R100) and high-frequency compression ratio (R119) are adjustable to suit the user. Audio is presented to the compressor EQ balance (R102). The compressor EQ balance controls the mix ratios of the compressor outputs. A compressor gain trim (R80) is provided to compensate for the amount of ampli

17、fication 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 U9B and master-gain control

18、R107, the signal is sent to output jack J2, effects-loop send. The signal input at J3, effects-loop return, goes to differential receiver U11A. Heater voltage (24VDC for 2 series-connected 12AX7s in the preamp) is derived from the 32VDC supply (+/-16VDC). Excess voltage is dropped across across para

19、lleled ballast resistors, R354-R356, on the preamp PCB. BASSMAN 300 (This is the model name for warranty claims) CIRCUIT DESCRIPTION (CONT) Output section On the top side of the chassis, at the rear of each pair (total = 3) of output tubes, is an LED and a fuse. The LED glows green when the associat

20、ed pair of tubes is operating properly, and glows red if a tube failure has caused the related fuse to blow. If a fuse blows, replace it only with one of the same type and rating. NEVER use a fuse with a higher current rating, as this could damage the equipment and present a serious safety hazard. N

21、ext, replace the tubes in their respective locations, check and adjust the bias and balance. NOTE: it is normal for the LEDs to glow red when the amp is in standby mode. Output tube bias adjustment instructions 1.Turn on the 300T and let it warm up for at least two minutes with the STANDBY switch in

22、 the ON position. Make sure the amplifier is connected to a speaker or equivalent load. 2.Remove the bias controls cover box. 3.With a DVM set to its most sensitive DC voltage scale, measure the voltage between the BIAS 100mV test points, and adjust the BIAS control for a reading of .1 VDC (100mVDC)

23、. 4.Next, connect the DVM to the BALANCE 0V test points, and adjust the BALANCE control for a reading of 0 VDC. 5.Replace the bias controls cover box. NOTES: 1.For optimum sonic performance, set bias to 100 mVDC first, then set balance. 2.If the output tubes cannot be biased to at least 80 mVDC, rep

24、lace the 6550C output tubes. 3.If the output tubes cannot be balanced, check the bias setting and/or replace the 6550C output tubes. 4.If the power tube trouble LEDs are glowing green, it does not indicate that the tubes are not worn or weak. Tube layout: BASSMAN 300 (This is the model name for warr

25、anty claims) PARTS LIST NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY PRINTED CIRCUIT BOARD ASSEMBLY QTY PART # DESCRIPTION REFERENCE DESIGNATION 4054360CAP AE AX 22uF 450V 20% 105CC162 C166 C170 C176 2054361CAP AE AX 47uF 450V 20% 105CC156 C159 4033606CAP AE RDL .47uF 50V 20%C102 C126 C127 C130 2054355

26、CAP AE RDL 1000uF 50V 20% 105CC174-175 8028463CAP AE RDL 10uF 50V 20%C41 C78 C81 C85 C88 C113 C178-179 1028458CAP AE RDL 1uF 50V 20%C82 4028459CAP AE RDL 2.2uF 50V 20%C27 C109 C112 C120 36028467CAP AE RDL 22uF 50V 20%C16 C19-20 C31 C33-34 C36 C38-39 C45 C48 C51 C54 C57 C61 C64 C67 C70 C73-74 C80 C84

27、 C86 C103 C107-108 C111 C115 C117 C124 C128 C144 C145 C147 C149-150 3054356CAP AE RDL 330uF 450V 20% 105CC171-173 4028460CAP AE RDL 4.7uF 50V 20%C2 C11 C12 C26 1038699CAP CA 100pF 100V 5%C37 2039265CAP CA 2200pF 100V 5%C79 C110 7039259CAP CA 220pF 100V 5%C8 C40 C104-106 C114 C116 5038873CAP CA 22pF

28、100V 5%C6 C15 C42 C59 C83 1039261CAP CA 330pF 100V 5%C142 2038701CAP CA 470pF 50V 5%C77 C163 2039256CAP CA 68pF 100V 5%C118 C119 25034788CAP CD .1uF 50V 20% .15 cutC4-5 C89-100 C121 C140-141 C146 C148 C151-155 C169 3025995CAP CD 8200pF 1000V 20% LLC167-168 C177 1027256CAP MPF .0015uF 100V 10%C30 302

29、7260CAP MPF .0039uF 100V 10%C123 C125 C129 2027264CAP MPF .01uF 100V 10%C32 C35 1024823CAP MPF .01uF 400V 10%C18 11027267CAP MPF .022uF 100V 10%C23-25 C55-56 C58 C60 C62-63 C75-76 2024835CAP MPF .022uF 630V 10%C160-161 9027272CAP MPF .047uF 63V 10%C9-10 C87 C131-133 C138-139 C143 1027275CAP MPF .068

30、uF 100V 10%C22 1027277CAP MPF .082uF 100V 10%C14 8027280CAP MPF .15uF 63V 10%C28-29 C46-47 C49-50 C52-53 2024853CAP MPF .1uF 250V 10%C157-158 4024854CAP MPF .1uF 400V 10%C3 C7 C13 C17 6027278CAP MPF .1uF 63V 10%C1 C21 C101 C122 C134-135 1027281CAP MPF .22uF 63V 10%C137 BASSMAN 300 (This is the model

31、 name for warranty claims) PARTS LIST NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY PARTS LIST PRINTED CIRCUIT BOARD ASSEMBLY (CONT) QTY PART # DESCRIPTION REFERENCE DESIGNATION 2027283CAP MPF .33uF 63V 10%C43-44 1027286CAP MPF .47uF 63V 10%C136 6030937CAP PFF RDL .0027uF 50V 5%C65-66 C68-69 C71-72 2054

32、357CAP PPF .001uF 2kV 10%C164-165 1051679CONTROL 10K5A 10K5C DETR102 11050514CONTROL SLIDER 30MM 50KWR71 R127-136 3037600CONTROL SNAPIN 100K BR80 R100 R119 1047540CONTROL SNAPIN 250K 15AR12 2037597CONTROL SNAPIN 250K 30AR31 R42 1041510CONTROL SNAPIN 25K BR107 2051681CONTROL SNAPIN 25K DET 2BR58 R62

33、1051677CONTROL SNAPIN RND 10KB 250KBR17 2026133CONTROL TRIM 25K LINR335 R361 14064089DIODE 1N4003 LLCR75-78 CR80-87 CR101-102 17026730DIODE 1N4006 800V 1ACR62-64 CR72 CR88-95 CR97-100 CR103 53006260DIODE 1N4448 SIGNAL LLCR1-25 CR27 CR29-39 CR44-50 CR52 CR54-60 CR96 8048361DIODE 1N5407 800V 3ACR65-71

34、 CR74 2029690DIODE HV 3KV 200mACR73 CR79 32025802FSTN TAB MALE .250 x.032 PCB MTCP1-12 CP14-15 CP17-28 CP32-34 CP36-38 2026000FSTN TAB MALE PCB MT .187X.032CP13 CP16 4031041FSTN TAB ML RTANG PCB .25x.032CP29-31 CP35 6051094FUSE CLIP PCB 5MM (EXPT)XF1 XF2 XF3 2013112FUSE TD 20mmx5mm 250v 1AF1-2 10131

35、09FUSE TD 20mmx5mm 250v 250mATF3 3033379CABLE RIBBON 3 CKT 10P9A P11A P12A 3049334CABLE RIBBON 3 CKT 20P6A P7A P10A 6027410HDR .1 CTR 3 CKT SQ PINP6B P7B P9B P10B P11B P12B 1051655CABLE 6 CKT 14P5A 2053856CABLE RIBBON 6 CKT 8P3A P8A 3027413HDR .1 CTR 6 CKT SQ PINP3B P5B P8B 1048914CABLE RIBBON 8 CKT

36、 7P4A 1027416HDR .1 CTR 8 CKT SQ PINP4B BASSMAN 300 (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 2041808HEADER 8 CKTx.1 LOP1B P2B 2041825HEADER 8 PIN VERT.P1A P2A 1

37、051680IC AUDIO PROCESSOR SSM2120U18 18051198IC DUAL OP AMP BA4560N SIPU1 U5-8 U11-16 U19-23 U26-27 6016795IC DUAL OP AMP TL072U2-4 U9-10 U17 1051856IC QUAD 2-IN NAND GATE 4011U25 1013562IC REGULATOR +15V MC7815CTU28 1013564IC REGULATOR -15V MC7915CTU29 1041261IC VOLT REF LM4040DIZ-10.0U24 2051006JAC

38、K 1/4 PCB DUAL TIP MONOJ1 J5 1051007JACK 1/4 PCB STEREO W/ SWITCHJ7 1051658JACK MONO R/AJ8 3053450JACK STEREO R/AJ2-4 3026481JACK TIPJ9-11 1049892JACK XLR MALEJ6 3031871LED BI-COLOR 5mmx5mmLD6-8 5028039LED RED 5x5mm SLB-55VR3LD2-5 LD9 1033177LED RED/GREEN 5x5mm BI-COLORLD1 1051411SPACER LED .4x.1 TU

39、RQUOISEAT LD1 5990470144SPACER LED.7x.125 BLUE A6192-3AT LD2-5 LD9 3041527SPACER RND NYL .680 x.250 x.147AT LD6-8 4025116RES CF 1/2W 100K 5% LLR10 R16 R27 R39 5026368RES CF 1/2W 100ohm 5% LLR317-318 R354-356 1048903RES CF 1/2W 18k 5% LLR331 4026493RES CF 1/2W 2.7K 5% LLR234 R237 R241 R287 1047436RES

40、 CF 1/2W 270ohm 5% LLR357 1027869RES CF 1/2W 470ohm 5% LLR221 4025941RES CF 1/2W 560ohm 5% LLR258 R337 R342 R347 4024967RES CF 1/4W 5% 1.2k LLR6 R14 R79 R150 2024969RES CF 1/4W 5% 1.5k LLR38 R50 2025073RES CF 1/4W 5% 1.5M LLR124 R189 15024997RES CF 1/4W 5% 100k LLR4 R29 R46 R75 R113 R181 R204 R226 R

41、271 R273-275 R289-290 R307 BASSMAN 300 (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 68024981RES CF 1/4W 5% 10k LLR1 R5 R8 R15 R18 R20-21 R25 R28 R33 R36 R43-44 R48

42、R51 R56 R61 R63-64 R66-69 R76 R81-83 R87 R97 R99 R106 R108-109 R112 R114-116 R121 R125 R177 R184 R190 R193 R197 R200-201 R208-209 R212 R217 R228 R231-232 R243-245 R248 R253-254 R261 R266 R276 R285 R291 R298 R305 R308 R351 5024937RES CF 1/4W 5% 10ohm LLR178-180 R203 R296 1024998RES CF 1/4W 5% 120k LL

43、R13 2029539RES CF 1/4W 5% 13k LLR53-54 5024999RES CF 1/4W 5% 150k LLR35 R91 R292 R319-320 4024985RES CF 1/4W 5% 15k LLR157 R163 R169 R175 4024986RES CF 1/4W 5% 18k LLR84 R86 R145 R151 8024965RES CF 1/4W 5% 1k LLR90 R94 R162 R174 R294-295 R297 R332 23025069RES CF 1/4W 5% 1M LLR2 R19 R26 R32 R37 R45 R

44、49 R92-93 R110 R210 R215 R219 R224 R236 R246-247 R251-252 R264 R279 R282 R286 2024971RES CF 1/4W 5% 2.2k LLR170 R218 2025075RES CF 1/4W 5% 2.2M LLR225 R267 3029455RES CF 1/4W 5% 2.4k LLR98 R120 R146 3025059RES CF 1/4W 5% 220k LLR11 R207 R293 7024956RES CF 1/4W 5% 220ohm LLR95-96 R122 R182-183 R195 R

45、205 20024987RES CF 1/4W 5% 22k LLR23 R40 R72-73 R78 R103 R214 R222 R229 R233 R238 R240 R242 R249 R259 R265 R268-269 R277 R284 4024988RES CF 1/4W 5% 27k LLR239 R255-256 R304 1029005RES CF 1/4W 5% 2k LLR158 7024973RES CF 1/4W 5% 3.3k LLR34 R140 R144 R152 R160 R164 R172 2026504RES CF 1/4W 5% 3.6k LLR57

46、 R59 2024975RES CF 1/4W 5% 3.9k LLR138 R154 5028865RES CF 1/4W 5% 30k LLR153 R159 R165 R171 R270 2025061RES CF 1/4W 5% 330k LLR24 R230 15024989RES CF 1/4W 5% 33k LLR60 R117 R137 R141 R147 R185 R191- 192 R198-199 R211 R227 R250 R278 R283 2025063RES CF 1/4W 5% 390k LLR333 R353 4024991RES CF 1/4W 5% 39

47、k LLR88 R118 R186 R188 4029610RES CF 1/4W 5% 3k LLR148 R156 R168 R176 1029472RES CF 1/4W 5% 4.3k LLR166 BASSMAN 300 (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 802

48、4977RES CF 1/4W 5% 4.7k LLR47 R52 R142 R216 R235 R339 R344 R349 1025828RES CF 1/4W 5% 430k LLR213 4025065RES CF 1/4W 5% 470k LLR41 R77 R206 R358 7024961RES CF 1/4W 5% 470ohm LLR260 R272 R280-281 R338 R343 R348 9024993RES CF 1/4W 5% 47k LLR104-105 R202 R373-378 10024947RES CF 1/4W 5% 47ohm LLR7 R9 R6

49、5 R89 R126 R187 R257 R262- 263 R306 5024978RES CF 1/4W 5% 5.6k LLR3 R30 R70 R74 R85 2024994RES CF 1/4W 5% 56k LLR155 R167 1028948RES CF 1/4W 5% 6.2k LLR55 2024979RES CF 1/4W 5% 6.8k LLR194 R196 7024995RES CF 1/4W 5% 68k LLR101 R111 R123 R139 R143 R334 R369 2025942RES CF 1/4W 5% 7.5k LLR161 R173 1024980RES CF 1/4W 5% 8.2k LLR149 8025068RE