Fender Bassman 300 Manual de usuario

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 100 Scottsdale, AZ 85250

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 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 part 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 used in the description of certain parts. The codes and what they mean are as follows:

CAPACITOR CODES HARDWARE CODES

CAP AE =Aluminum Electrolytic BLX =Black Oxide

CAP CA =Ceramic Axial CR =Chrome Plated

CAP CD =Ceramic Disk HWH =Hex Washer Head

CAP MPF =Metalized Polyester Film M=Machine Screw

CAP MY =Mylar NI =Nickel Plated

CAP PFF =Polyester Film/Foil OHP =Oval Head Phillips

PB =Particle Board

RESISTOR CODES PHP =Pan Head Phillips

PHPS =Pan Head Phillips Sems

RES CC =Carbon Comp SMA =Sheet Metal "A" Point

RES CF =Carbon Film SMB =Sheet Metal "B" Point

RES FP =Flame Proof SS =Stainless Steel

RES MF =Metal Film TF =Thread Forming

RES WW =Wire Wound ZI =Zinc Plated

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

110V TW : 21-3312010

230V ARG : 21-3352010

Power Requirements: All Versions : 900W

Preamp Section

Input impedance: 470 kΩ

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 notch: -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 kΩ

Power output: 300 Watts RMS into 2, 4, 0r 8Ω@ <3% THD

Sensitivity: 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

BASSMAN 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 60's style overdrive sound. The op-amp is 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 (R17) so

that a "blend" can be established. The channel select button (S9) on the front panel (or it's foot switch counterpart)

selects 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) , mid-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 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 ratio (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 amplification 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 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 paralleled 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 associated 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. Next, 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 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 it's 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)..

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, replace 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 warranty claims)

PARTS LIST

NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY

PRINTED CIRCUIT BOARD ASSEMBLY

QTY PART # DESCRIPTION REFERENCE DESIGNATION

4054360 CAP AE AX 22uF 450V 20% 105C C162 C166 C170 C176

2054361 CAP AE AX 47uF 450V 20% 105C C156 C159

4033606 CAP AE RDL .47uF 50V 20% C102 C126 C127 C130

2054355 CAP AE RDL 1000uF 50V 20% 105C C174-175

8028463 CAP AE RDL 10uF 50V 20% C41 C78 C81 C85 C88 C113 C178-179

1028458 CAP AE RDL 1uF 50V 20% C82

4028459 CAP AE RDL 2.2uF 50V 20% C27 C109 C112 C120

36 028467 CAP 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 C86 C103 C107-108

C111 C115 C117 C124 C128 C144

C145 C147 C149-150

3054356 CAP AE RDL 330uF 450V 20% 105C C171-173

4028460 CAP AE RDL 4.7uF 50V 20% C2 C11 C12 C26

1038699 CAP CA 100pF 100V 5% C37

2039265 CAP CA 2200pF 100V 5% C79 C110

7039259 CAP CA 220pF 100V 5% C8 C40 C104-106 C114 C116

5038873 CAP CA 22pF 100V 5% C6 C15 C42 C59 C83

1039261 CAP CA 330pF 100V 5% C142

2038701 CAP CA 470pF 50V 5% C77 C163

2039256 CAP CA 68pF 100V 5% C118 C119

25 034788 CAP CD .1uF 50V 20% .15" cut C4-5 C89-100 C121 C140-141 C146

C148

C151-155 C169

3025995 CAP CD 8200pF 1000V 20% LL C167-168 C177

1027256 CAP MPF .0015uF 100V 10% C30

3027260 CAP MPF .0039uF 100V 10% C123 C125 C129

2027264 CAP MPF .01uF 100V 10% C32 C35

1024823 CAP MPF .01uF 400V 10% C18

11 027267 CAP MPF .022uF 100V 10% C23-25 C55-56 C58 C60 C62-63 C75-76

2024835 CAP MPF .022uF 630V 10% C160-161

9027272 CAP MPF .047uF 63V 10% C9-10 C87 C131-133 C138-139 C143

1027275 CAP MPF .068uF 100V 10% C22

1027277 CAP MPF .082uF 100V 10% C14

8027280 CAP MPF .15uF 63V 10% C28-29 C46-47 C49-50 C52-53

2024853 CAP MPF .1uF 250V 10% C157-158

4024854 CAP MPF .1uF 400V 10% C3 C7 C13 C17

6027278 CAP MPF .1uF 63V 10% C1 C21 C101 C122 C134-135

1027281 CAP MPF .22uF 63V 10% C137

BASSMAN 300

(This is the model 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

2027283 CAP MPF .33uF 63V 10% C43-44

1027286 CAP MPF .47uF 63V 10% C136

6030937 CAP PFF RDL .0027uF 50V 5% C65-66 C68-69 C71-72

2054357 CAP PPF .001uF 2kV 10% C164-165

1051679 CONTROL 10K5A 10K5C DET R102

11 050514 CONTROL SLIDER 30MM 50KW R71 R127-136

3037600 CONTROL SNAPIN 100K B R80 R100 R119

1047540 CONTROL SNAPIN 250K 15A R12

2037597 CONTROL SNAPIN 250K 30A R31 R42

1041510 CONTROL SNAPIN 25K B R107

2051681 CONTROL SNAPIN 25K DET 2B R58 R62

1051677 CONTROL SNAPIN RND 10KB 250KB R17

2026133 CONTROL TRIM 25K LIN R335 R361

14 064089 DIODE 1N4003 LL CR75-78 CR80-87 CR101-102

17 026730 DIODE 1N4006 800V 1A CR62-64 CR72 CR88-95 CR97-100

CR103

53 006260 DIODE 1N4448 SIGNAL LL CR1-25 CR27 CR29-39 CR44-50 CR52

CR54-60 CR96

8048361 DIODE 1N5407 800V 3A CR65-71 CR74

2029690 DIODE HV 3KV 200mA CR73 CR79

32 025802 FSTN TAB MALE .250x.032 PCB MT CP1-12 CP14-15 CP17-28 CP32-34

CP36-38

2026000 FSTN TAB MALE PCB MT .187X.032 CP13 CP16

4031041 FSTN TAB ML RTANG PCB .25x.032 CP29-31 CP35

6051094 FUSE CLIP PCB 5MM (EXPT) XF1 XF2 XF3

2013112 FUSE TD 20mmx5mm 250v 1A F1-2

1013109 FUSE TD 20mmx5mm 250v 250mAT F3

3033379 CABLE RIBBON 3 CKT 10" P9A P11A P12A

3049334 CABLE RIBBON 3 CKT 20" P6A P7A P10A

6027410 HDR .1 CTR 3 CKT SQ PIN P6B P7B P9B P10B P11B P12B

1051655 CABLE 6 CKT 14" P5A

2053856 CABLE RIBBON 6 CKT 8" P3A P8A

3027413 HDR .1 CTR 6 CKT SQ PIN P3B P5B P8B

1048914 CABLE RIBBON 8 CKT 7" P4A

1027416 HDR .1 CTR 8 CKT SQ PIN P4B

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

2041808 HEADER 8 CKTx.1" LO P1B P2B

2041825 HEADER 8 PIN VERT. P1A P2A

1051680 IC AUDIO PROCESSOR SSM2120 U18

18 051198 IC DUAL OP AMP BA4560N SIP U1 U5-8 U11-16 U19-23 U26-27

6016795 IC DUAL OP AMP TL072 U2-4 U9-10 U17

1051856 IC QUAD 2-IN NAND GATE 4011 U25

1013562 IC REGULATOR +15V MC7815CT U28

1013564 IC REGULATOR -15V MC7915CT U29

1041261 IC VOLT REF LM4040DIZ-10.0 U24

2051006 JACK 1/4 PCB DUAL TIP MONO J1 J5

1051007 JACK 1/4 PCB STEREO W/ SWITCH J7

1051658 JACK MONO R/A J8

3053450 JACK STEREO R/A J2-4

3026481 JACK TIP J9-11

1049892 JACK XLR MALE J6

3031871 LED BI-COLOR 5mmx5mm LD6-8

5028039 LED RED 5x5mm SLB-55VR3 LD2-5 LD9

1033177 LED RED/GREEN 5x5mm BI-COLOR LD1

1051411 SPACER LED .4x.1 TURQUOISE AT LD1

5990470144 SPACER LED.7x.125 BLUE A6192-3 AT LD2-5 LD9

3041527 SPACER RND NYL .680x.250x.147 AT LD6-8

4025116 RES CF 1/2W 100K 5% LL R10 R16 R27 R39

5026368 RES CF 1/2W 100ohm 5% LL R317-318 R354-356

1048903 RES CF 1/2W 18k 5% LL R331

4026493 RES CF 1/2W 2.7K 5% LL R234 R237 R241 R287

1047436 RES CF 1/2W 270ohm 5% LL R357

1027869 RES CF 1/2W 470ohm 5% LL R221

4025941 RES CF 1/2W 560ohm 5% LL R258 R337 R342 R347

4024967 RES CF 1/4W 5% 1.2k LL R6 R14 R79 R150

2024969 RES CF 1/4W 5% 1.5k LL R38 R50

2025073 RES CF 1/4W 5% 1.5M LL R124 R189

15 024997 RES CF 1/4W 5% 100k LL R4 R29 R46 R75 R113 R181 R204

R226 R271 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

68 024981 RES CF 1/4W 5% 10k LL R1 R5 R8 R15 R18 R20-21 R25 R28 R33

R36 R43-44 R48 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

5024937 RES CF 1/4W 5% 10ohm LL R178-180 R203 R296

1024998 RES CF 1/4W 5% 120k LL R13

2029539 RES CF 1/4W 5% 13k LL R53-54

5024999 RES CF 1/4W 5% 150k LL R35 R91 R292 R319-320

4024985 RES CF 1/4W 5% 15k LL R157 R163 R169 R175

4024986 RES CF 1/4W 5% 18k LL R84 R86 R145 R151

8024965 RES CF 1/4W 5% 1k LL R90 R94 R162 R174 R294-295 R297

R332

23 025069 RES CF 1/4W 5% 1M LL R2 R19 R26 R32 R37 R45 R49 R92-93

R110 R210 R215 R219 R224 R236

R246-247 R251-252 R264 R279 R282

R286

2024971 RES CF 1/4W 5% 2.2k LL R170 R218

2025075 RES CF 1/4W 5% 2.2M LL R225 R267

3029455 RES CF 1/4W 5% 2.4k LL R98 R120 R146

3025059 RES CF 1/4W 5% 220k LL R11 R207 R293

7024956 RES CF 1/4W 5% 220ohm LL R95-96 R122 R182-183 R195 R205

20 024987 RES CF 1/4W 5% 22k LL R23 R40 R72-73 R78 R103 R214 R222

R229 R233 R238 R240 R242 R249 R259

R265 R268-269 R277 R284

4024988 RES CF 1/4W 5% 27k LL R239 R255-256 R304

1029005 RES CF 1/4W 5% 2k LL R158

7024973 RES CF 1/4W 5% 3.3k LL R34 R140 R144 R152 R160 R164 R172

2026504 RES CF 1/4W 5% 3.6k LL R57 R59

2024975 RES CF 1/4W 5% 3.9k LL R138 R154

5028865 RES CF 1/4W 5% 30k LL R153 R159 R165 R171 R270

2025061 RES CF 1/4W 5% 330k LL R24 R230

15 024989 RES CF 1/4W 5% 33k LL R60 R117 R137 R141 R147 R185 R191-

192 R198-199 R211 R227 R250 R278

R283

2025063 RES CF 1/4W 5% 390k LL R333 R353

4024991 RES CF 1/4W 5% 39k LL R88 R118 R186 R188

4029610 RES CF 1/4W 5% 3k LL R148 R156 R168 R176

1029472 RES CF 1/4W 5% 4.3k LL R166

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

8024977 RES CF 1/4W 5% 4.7k LL R47 R52 R142 R216 R235 R339 R344

R349

1025828 RES CF 1/4W 5% 430k LL R213

4025065 RES CF 1/4W 5% 470k LL R41 R77 R206 R358

7024961 RES CF 1/4W 5% 470ohm LL R260 R272 R280-281 R338 R343 R348

9024993 RES CF 1/4W 5% 47k LL R104-105 R202 R373-378

10 024947 RES CF 1/4W 5% 47ohm LL R7 R9 R65 R89 R126 R187 R257 R262-

263

R306

5024978 RES CF 1/4W 5% 5.6k LL R3 R30 R70 R74 R85

2024994 RES CF 1/4W 5% 56k LL R155 R167

1028948 RES CF 1/4W 5% 6.2k LL R55

2024979 RES CF 1/4W 5% 6.8k LL R194 R196

7024995 RES CF 1/4W 5% 68k LL R101 R111 R123 R139 R143 R334 R369

2025942 RES CF 1/4W 5% 7.5k LL R161 R173

1024980 RES CF 1/4W 5% 8.2k LL R149

8025068 RES CF 1/4W 5% 820k LL R288 R299-303 R321-322

2027353 RES FILM 1W 100K LL 5% LL R326-327

1027349 RES FILM 1W 10K 5% LL R359

2041706 RES FILM 1W 470k 5% LL R313-314

6027354 RES FILM 1W 5% 220k LL R336 R340-341 R345-346 R350

3036470 RES MOX FP 1W 5% 10k LL R328 R379-380

2054213 RES MOX 2W 100k 5% LL R311-312

1053945 RES MOX 2W 150k 5% LL R329

2031629 RES MOX 2W 1ohm 5% LL R365 R368

1028021 RES MOX 2W 470ohm 5% LL R220

12 027628 RES MOX 2W 47ohm 5% LL R309-310 R324-325 R362-364 R366-367

R371-372 R381

2053947 RES MOX BT 18Kohm 5W 5% R316 R323

1053948 RES MOX BT 39Kohms 5W 5% R360

2031703 RES WW BT 10W 10% .22 ohm R330 R352

1026483 RES WW BT 10W 10% 2.7k R370

1053950 RES WW BT 18k 10W 10% R315

5050817 SWITCH PB PC VERT MNT DPDT S2-4 S6 S9

1049557 SWITCH PC MNT 2P3T S10

4028091 SWITCH PUSH SLFLK SHORT STROKE S1 S5 S7-8

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