Fender Bassman Bassman 100 User manual

BASSMAN 100
p/n 022-4503-000 (120V)
SERVICE MANUAL
CONTENTS:
Notices
Specifications
Service notes
Parts lists:
PCB assy-preamp
PCB assy pwramp
Chassis assy
Cabinet assy
End item
Drawings
Fender Musical Instruments Corp. 7975 North Hayden Road Scottsdale, AZ 85258

BASSMAN 100
(This is the model name for warranty claims)
SERVICE MANUAL
FEBRUARY 2000
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 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 100
SPECIFICATIONS
Product Release No.: PR 420 (This is not a model number)
Part Number: 120V Version : 22-4503
240V Aus : 22-4533
230V UK : 22-4543
230V Eur : 22-4563
100V : 22-4573
Power Requirements: 100V Version : 100 VAC 50/60 Hz, 360W
120V : 120 VAC 60 Hz, 360W
230V : 230 VAC 50 Hz, 360W
240V : 240 VAC 50 Hz, 360W
Power Amp Section:
Power Output: 100 Watts RMS into 4Ω@ <1% THD
Sensitivity: 1.1115V RMS
Preamp Section:
Input impedance: Passive: 1MΩActive: 1MΩ
Sensitivity For
Full Power: Passive: 12mV Active: 25mV
Nominal Level: Passive: 75mV Active: 150mV
Tone Controls: Bass: +/- 15 dB @ 50 Hz
Semi-parametric control: Mid frequency: 150 to 1500 Hz
Mid level: +/-15 dB @ Mid frequency setting
Treble:+/-15 dB @ 5 kHz
Speaker Complement: One 4 ΩFender Special Design 15" woofer (P/N 0040580000)
One Motorola Piezo Horn (P/N 0053641000)
Effects Loop:Send impedance: 1kΩ
Return impedance: 22kΩ
Nominal level: +4dBu
Dimensions: Height:24 1/4" (61.6 cm)
Width: 23" (58.4 cm)
Depth: 12 1/2" (31.8 cm)
Weight: 65 lbs. (29.3 kg)
Product specifications are subject to change without notice

BASSMAN 100
SERVICE NOTES
1. HORN REPLACEMENT requires speaker removal in order to access horn wiring. If wire ties,
clamps, etc. are removed for ease of connecting/disconnecting horn wires, these must be replaced to
prevent buzzing at higher power levels.
2. RIBBON CABLES running between rear panel board and preamp board should be routed next to
the chassis, underneath the power-amp board.
3. CHASSIS REMOVAL is accomplished by first removing six (6) screws from the top, and one (1)
screw from each side of the cabinet; then slide the chassis toward the rear just far enough to provide
access to the speaker wiring. Note: the speaker wires are bundled and shrink-wrapped with the
power transformer secondary wiring, and this configuration must be restored after servicing (for
safety compliance). Locate the speaker wires (white goes to P1, black goes to P2 of the power-amp
board) and disconnect them. It will be necessary to cut the shrink wrap (take care not to cut the
transformer wires) so that the speaker wires can be pulled from the opening in the bottom of the chassis.
It should be noted that the speaker wires have been glued in place inside the speaker baffle (for sound
quality reasons), if this is disturbed during disassembly, it should be restored by removing the speaker, and
working through the speaker hole; leave sufficient slack to allow reassembly of the speaker leads to the
chassis.
For reference, the red wires from the transformer go to P3 & P5. The red/yellow wire goes to P4.
PARTS LIST
NOTE: SHADED ITEMS ARE FOR REFERENCE ONLY
PRINTED CIRCUIT BOARD ASSEMBLY - PREAMP
QTY PART # DESCRIPTION REFERENCE DESIGNATION
1 26517001 CAP AE AX 2.2uF 50V 20% C40
2 38691001 CAP AE AX 4.7uF 50V 20% C2 C6
9 25960001 CAP AE AX 22uF 16V 20% C5 C13 C20 C25-27 C30-31 C33
1 38693001 CAP AE AX 47uF 16V 20% C64
4 42001001 CAP CA 33pF 100V LL C8 C19 C21 C32
1 39256001 CAP CA 68pF 100V LL C22
1 38699001 CAP CA 100pF 100V LL C39
2 39261001 CAP CA 330pF 100V LL C11 C37
2 38703001 CAP CA .1uF 50V C38 C41
2 51405003 CAP CD 120pF 500V 5% C28-29
1 51960003 CAP CD 180pF 500V 10% C1
16 34788003 CAP CR .1uF 50V 20% .2" LS C44-45 C52-63 C65-66
1 27256003 CAP MPF .0015uF 100V 10% C10
1 27257003 CAP MPF .0022uF 100V 10% C23
1 27259003 CAP MPF .0033uF 100V 10% C17
2 27260003 CAP MPF .0039uF 100V 10% C36 C67
1 27261003 CAP MPF .0047uF 100V 10% C18
1 27262003 CAP MPF .0068uF 100V 10% C12
1 27264003 CAP MPF .01uF 100V 10% C15

BASSMAN 100
PRINTED CIRCUIT BOARD ASSEMBLY - PREAMP (cont)
QTY PART # DESCRIPTION REFERENCE DESIGNATION
1 27265003 CAP MPF .015uF 100V 10% C9
1 27270003 CAP MPF .033uF 100V 10% C16
2 27278003 CAP MPF .1uF 63V 10% C3-4
1 27281003 CAP MPF .22uF 63V 10% C24
2 27283003 CAP MPF .33uF 63V 10% C34-35
3 27286003 CAP MPF .47uF 63V 10% C14 C47 C49
2 33578003 CAP PFF RDL .001uF 100V 10% C42 C51
1 33581003 CAP PFF RDL .0033uF 100V 10% C50
1 30942003 CAP PFF RDL .0056uF 50V 5% C7
3 33592003 CAP PFF RDL .047uF 100V 10% C43 C46 C48
1 31089000 CONTROL SNAPIN 100k 10C DUAL R36 (Mid frequency)
6 27945000 CONTROL SNAPIN 100k B TAPER R14 R27-29 R56 R72 (Gain, Bass, Mid level,
Treble, Compressor, Master vol)
26 6260001 DIODE 1N4448 SIGNAL LL D1-9 D11-17 D19-20 D22-27 D29 D32
1 27327001 DIODE ZEN 1N5234B 6.2V 5% LL D10
1 31635001 DIODE ZEN 1N5240B 10V 5% LL D30
2 27413000 HDR .1 CTR 6 CKT SQ PIN P1-2
1 27416000 HDR .1 CTR 8 CKT SQ PIN P3
6 31611000 IC OP-AMP DUAL PC4560 U6 U9-13
6 16795000 IC OP-AMP DUAL TL072 U1-5 U7
1 27404000 IC OTA CA3080AE U8
1 53450000 JACK STEREO R/A J1 (Input)
1 30755000 LED GREEN T-1 3mm DIFFUSED D31
2 49948000 LED RED LONG LEAD LUMEX D21 D28
1 40271000 LED RED/YELLOW D18
4 24937001 RES CF 1/4W 5% 10ohm LL R1-2 R119-120
2 24947001 RES CF 1/4W 5% 47ohm LL R81-82
1 24952001 RES CF 1/4W 5% 100ohm LL R45
2 24962001 RES CF 1/4W 5% 560ohm LL R59-60
1 29607001 RES CF 1/4W 5% 620ohm LL R118
1 24963001 RES CF 1/4W 5% 680ohm LL R106
3 24965001 RES CF 1/4W 5% 1k LL R78 R96 R112
4 24971001 RES CF 1/4W 5% 2.2k LL R12-13 R92 R94
1 24973001 RES CF 1/4W 5% 3.3k LL R3
1 24977001 RES CF 1/4W 5% 4.7k LL R83
3 24978001 RES CF 1/4W 5% 5.6k LL R30 R58 R61
1 28948001 RES CF 1/4W 5% 6.2k LL R109
1 24979001 RES CF 1/4W 5% 6.8k LL R40
1 24980001 RES CF 1/4W 5% 8.2k LL R51
1 24983001 RES CF 1/4W 5% 12k LL R84
1 24985001 RES CF 1/4W 5% 15k LL R15
1 24986001 RES CF 1/4W 5% 18k LL R17
2 29006001 RES CF 1/4W 5% 20k LL R46 R50
9 24987001 RES CF 1/4W 5% 22k LL R19 R66-69 R95 R100 R111 R122
4 24988001 RES CF 1/4W 5% 27k LL R18 R20 R85-86
3 24989001 RES CF 1/4W 5% 33k LL R42-43 R52
1 24991001 RES CF 1/4W 5% 39k LL R23
9 24993001 RES CF 1/4W 5% 47k LL R8-9 R11 R26 R41 R70-71 R88-89
2 28990001 RES CF 1/4W 5% 51k LL R73-74
4 24994001 RES CF 1/4W 5% 56k LL R10 R21-22 R24
2 26507001 RES CF 1/4W 5% 62k LL R54 R107
2 24995001 RES CF 1/4W 5% 68k LL R34-35
3 24996001 RES CF 1/4W 5% 82k LL R57 R75-76
4 24997001 RES CF 1/4W 5% 100k LL R32-33 R99 R123
1 28549001 RES CF 1/4W 5% 110k LL R77

BASSMAN 100
PRINTED CIRCUIT BOARD ASSEMBLY - PREAMP (cont)
QTY PART # DESCRIPTION REFERENCE DESIGNATION
1 24998001 RES CF 1/4W 5% 120k LL R93
2 25059001 RES CF 1/4W 5% 220k LL R104-105
3 25063001 RES CF 1/4W 5% 390k LL R4 R7 R31
3 25069001 RES CF 1/4W 5% 1M LL R25 R53 R101
3 25073001 RES CF 1/4W 5% 1.5M LL R55 R108 R110
1 25075001 RES CF 1/4W 5% 2.2M LL R90
1 25084001 RES CF 1/4W 5% 10M LL R87
22 24981001 RES CF 1/4W 5% 10k LL R5-6 R16 R37-39 R44 R47-49 R62-65 R79-80
R98 R102-103 R114-116
5 27348001 RES FILM 1W 5% 3.3k LL R91 R97 R113 R117 R121
4 28091000 SWITCH PUSH SLFLK SHORT STROKE S1-4 (Active/Passive, Enhance, Mute, Limiter)
2 14689003 XSTR N-CH JFET J111 TO-92 Q1-2
3 16739003 XSTR NPN 2N4401 TO-92 Q3-4 Q8
4 16742003 XSTR PNP 2N4403 TO-92 Q5-7 Q9
4 48451000 BUTTON PUSH OFF WHITE @ S1-4
3 36178000 SPACER LED .5X.1 BROWN @ D21 D28 D31
155630000 PCB, FAB, PREAMP, BASSMAN 100
PRINTED CIRCUIT BOARD ASSEMBLY - POWER AMP
QTY PART # DESCRIPTION REFERENCE DESIGNATION
2 53856000 CABLE RIBBON 6 CKT 8" PW1-2
1 48914000 CABLE RIBBON 8 CKT 7" PW3
1 26517001 CAP AE AX 2.2uF 50V 20% C4
8 25960001 CAP AE AX 22uF 16V 20% C16-17 C20-25
8 49521000 CAP AE AX 47uF 50V 20% C2 C5 C11-12 C26-27 C31-32
1 28474003 CAP AE RDL 100uF 25V 20% C3
2 31756000 CAP AE RDL 4700uF 50V +100%-20% C29-30
2 42001001 CAP CA 33pF 100V LL C36-37
2 38703001 CAP CA .1uF 50V C34-35
2 51409003 CAP CD 68pF 500V 5% C7-8
2 51459003 CAP CD 560pF 500V 10% C18-19
2 34788003 CAP CR .1uF 50V 20% .2" LS C9-10
3 27257003 CAP MPF .0022uF 100V 10% C1 C13-14
1 27278003 CAP MPF .1uF 63V 10% C15
1 52003003 CAP MPF .1uF 250V 10% C28
1 53860000 CAP MPF .1uF 250VAC 20% C33
1 27941000 CONTROL SNAPIN 50k B TAPER R55 (DI level)
2 64089001 DIODE 1N4003 LL D23-24
15 6260001 DIODE 1N4448 SIGNAL LL D1-8 D11-14 D21-22 D25
4 29045000 DIODE 6A 400V 6A4 LEAD FORMED D26-29
2 25821001 DIODE HV FDH400 SWITCHING D15-16
2 31635001 DIODE ZEN 1N5240B 10V 5% LL D9-10
2 28119060 DIODE ZEN 1N5353B 16V 5W 5% D30-31
4 26000001 FASTON TAB, .187" P6 P9 P13-14
10 25802000 FASTON TAB, .250" P1-5 P7-8 P10-12

BASSMAN 100
PRINTED CIRCUIT BOARD ASSEMBLY - POWER AMP (cont)
QTY PART # DESCRIPTION REFERENCE DESIGNATION
1 31611000 IC OP-AMP DUAL PC4560 U1
1 51658000 JACK MONO R/A J3 (Tuner)
2 53450000 JACK STEREO R/A J1-2 (FX send,FX return)
1 54261000 XLR CONNECTOR MALE RT ANGLE J4 (DI out)
2 26549001 RES CF 1/2W 5% 1.5k LL R25 R28
3 24937001 RES CF 1/4W 5% 10ohm LL R26-27 R66
3 24947001 RES CF 1/4W 5% 47ohm LL R4 R6 R12
11 24965001 RES CF 1/4W 5% 1k LL R1 R3 R5 R16 R37 R39 R45-48 R65
4 24971001 RES CF 1/4W 5% 2.2k LL R20-23
2 24972001 RES CF 1/4W 5% 2.7k LL R36 R38
2 24973001 RES CF 1/4W 5% 3.3k LL R56 R59
1 24975001 RES CF 1/4W 5% 3.9k LL R10
1 24977001 RES CF 1/4W 5% 4.7k LL R7
2 24981001 RES CF 1/4W 5% 10k LL R57-58
2 24986001 RES CF 1/4W 5% 18k LL R9 R15
1 24987001 RES CF 1/4W 5% 22k LL R8
1 24988001 RES CF 1/4W 5% 27k LL R2
1 24993001 RES CF 1/4W 5% 47k LL R11
6 24997001 RES CF 1/4W 5% 100k LL R43-44 R49-50 R54 R64
3 25059001 RES CF 1/4W 5% 220k LL R51-53
2 37354001 RES FILM 1W 5% 4.7k LL R24 R29
3 36960001 RES MF FUSE 1/4W 5% 47ohm LL R30-31 R40
2 27750001 RES MF FUSE 1/4W 5% 100ohm LL R18-19
2 51731001 RES MF FUSE 1/4W 5% 1k LL R13-14
4 31628001 RES MOX 2W 5% .22ohm LL R32-35
2 27628001 RES MOX 2W 5% 47ohm LL R41-42
4 41256000 RES WW 5W 10% 470ohm R60-63
2 28091000 SWITCH PUSH SLFLK SHORT STROKE S1-2 (DI select)
1 51418003 THERMAL SENSOR PTC 100 DEG C RT1
1 14689003 XSTR N-CH JFET J111 TO-92 Q21
1 16739003 XSTR NPN 2N4401 TO-92 Q19
4 25751003 XSTR NPN 2SC2362K/2SC2389STPS Q1-3 Q8
2 54418000 XSTR NPN 2SC3263 MT-100 Q14-15
1 28760000 XSTR NPN 2SC4793/2SC3298B Q13
1 51448003 XSTR NPN 2SD1857 Q11
1 14867003 XSTR NPN MPSW42 (TO-92) Q10
3 16742003 XSTR PNP 2N4403 TO-92 Q4-5 Q20
2 25752003 XSTR PNP 2SA1038STPS Q6-7
2 54417000 XSTR PNP 2SA1294 MT-100 Q17-18
1 28759000 XSTR PNP 2SA1306A TO-220P Q16
1 51447003 XSTR PNP 2SB1236 Q12
1 14866003 XSTR PNP MPSW92 TO-226AE Q9
2 48451000 BUTTON PUSH OFF WHITE AT S1-2
155772000 PCB, FAB, POWER AMP, BASSMAN 100
1 55636000 HEATSINK PLATE, BASSMAN 100
3 32908000 SCRW TF 6-32X3/8 PHP ZI AT ITEM 103 AND 101
2 51094003 FUSE CLIP PCB 5MM AT F1
4 40903000 INSULATOR MICA TO-218 AT Q14-15, Q17-18
4 32937000 WSHR CONE AT Q14-15, Q17-18
6 27638000 SCRW TF 4-40X3/8 HWHS ZI .1" HD AT Q13-18

BASSMAN 100
CHASSIS ASSEMBLY
QTY PART # DESCRIPTION REFERENCE DESIGNATION
10054843000 CHASSIS, BASSMAN 100
1 0054642000 CONNECTOR IEC SNAP IN
1 0053884000 FUSE QA 20MMX5MM 125V4A ULCSA 100V/120V
1 0020794000 FUSE QA 20MMX5MM 250V 2A EXPORT 220V/240V
7 0055775000 KNOB ROT W/ CH INS, BASSMAN
1 0019798000 KNOB ROTARY SS DI LEVEL ON REAR
1 0055637000 HEATSINK BAR, BASSMAN 100
4 0028500000 SCRW TF 8-32x3/4 HWH SLTD Z1 @HEATSINK
10055631000 PCB ASSY, PREAMP, BASSMAN 100
10055773000 PCB ASSY, POWER AMP, BASSMAN 100
10055629000 PANEL, REAR, BASSMAN 100
10055628000 PANEL, FRONT, BASSMAN 100
1 0040582000 SWITCH DPST .250 TAB GLOBAL EXPORT
1 0039236000 SWITCH ROCKER DPST PSEUDO-IEC DOMESTIC
1 0038900000 SCRW TF 6-32X1/4 PHP ZI CHS GND
17 0051404000 STANDOFF NYLON BLK .375
1 0053479000 NUT, HEX 7/16-20X1/8 NI @FRONT IN JACK ONLY
1 0053480000 WASHER FLAT .442 X .692 NI @FRONT IN JACK ONLY
2 0051155000 SCRW SMB #4X3/8 PHP BLX XLR JACK
3 0055838000 NUT PLASTIC BLK REAN JACK REAR JACKS
1 0040696000 XFMR PWR 120V 100W BXR100
1 0040697000 XFMR, PWR, EXP BXR100, 100W
1 0033045000 END BELL XFMR PWRCH @XFMR
4 0028591000 NUT ACORN 8-32 @XFMR
4 0030007000 WSHR LCK INTL 8x.330x.02 ZI @XFMR
CAB ASSEMBLY
QTY PART # DESCRIPTION REFERENCE DESIGNATION
1 0048958000 HANDLE RECESSED KXR/BXR
1 0049564000 GASKET HANDLE
2 0026568000 CORNER 3 HOLE NI @LOWER REAR
4 0029071000 CORNER NOTCHED NICKLE (FD)
4 0051049000 FOOT RUBBER 1.5 DIA
3 0038796000 SCREW 8 x 1-1/2 PFH SM ZI @BACK CLEAT
10 0026571000 SCREW SMAB 8X5/8 THP NI @CORNERS
8 0016627000 SCREW SMA 8 X 3/4 OHP BLX @HANDLE
1 0021972000 NUT T 10-32X3/4 STR 3 PRNG BLX @SPEAKER MOUNT
4 0033380000 SCREW SMAB 8X1 THP BLX @FEET
2.01 0051343000 VINYL TOLEX 4227A (SY)
.12 0040046000 CARPET BLACK (SY) GRILLE DAMP CLEAT

BASSMAN 100
END ITEM ASSEMBLY
QTY PART # DESCRIPTION REFERENCE DESIGNATION
1 0055360000 CAB ASSY, BASSMAN 100
1 0055623000 CHS ASSY, BASSMAN 100, 120V DOMESTIC 120V
1 0055624000 CHS ASSY BASSMAN 100 230V EXPORT 230V UK/EUR
1 0055626000 CHS ASSY BASSMAN 100 240V AUST EXPORT 240V AUST
1 0055627000 CHS ASSY BASSMAN 100 100V EXPORT 100V JPN
1 0047248000 CORD PWR W/ IEC CONN DOM DOMESTIC
1 0047250000 CORD PWR W/ IEC CONN 250V EXPORT 240V AUST
1 0047249000 CORD PWR W/ IEC CONN 230V UK EXPORT 230V UK
1 0047251000 CORD PWR W/ IEC CONN 230V EXPORT 230V EUR
1 0053997000 CORD PWR W/ IEC CONN 100V JPN EXPORT 100V JPN
1 0055831000 GASKET, HORN, BASSMAN SERIES
1 0053641000 HORN PIEZO LTB 12 SPKR
1 0040580000 SPEAKER 15" 4M 100W (099-4815-001)
1 0055731000 LOGO, DOME, BASSMAN AMPS
1 0050850000 NAMEPLATE VINTAGE PLASTIC SMAL
1 0055671000 GRILLE, METAL, BASSMAN 100
2 0050312000 SCRW 2-56X3/8 FHP NI LOGO
8 0026577000 SCRW M 10-32x1 PHP BLX SPKR
8 0029527000 WSHR FNSH 8-5/8 FLNGD BLX WX CHS
10 0036112000 SCRW SMAB 6X1-1/4 OHP BLX W/ WS GRL
8 0036199000 SCRW M 8-32x1-3/16 OHP BLX CP CHS (PEM)
2 0050311000 NUT 2-56 NYLON INSERT 2CNME-Z LOGO
4 0024052000 SCRW SMA 6-X5/8 PHP BLX HORN