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SERVICE MANUAL
WORLD HEADQUARTERS CANADA Yorkville Sound
550 Granite Court Pickering, Ontario L1W-3Y8 CANADA Voice: (905) 837-8481 Fax: (905) 837-8746

U.S.A. Yorkville Sound Inc.
4625 Witmer Industrial Estate Niagara Falls, New York 14305 USA Voice: (716) 297-2920 Fax: (716) 297-3689

sm-bm50.pdf Sept/98

Quality and Innovation Since 1963
Printed in Canada

BM50 Parts List 9/29/98

IMPORTANT SAFETY INSTRUCTIONS

INSTRUCTIONS PERTAINING TO A RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSONS.

INSTRUCTIONS RELATIVES AU RISQUE DE FEU, CHOC ÉLECTRIQUE, OU BLESSURES AUX PERSONNES.

CAUTION:
TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER SERVICEABLE PARTS INSIDE.

AVIS:
AFIN DE RÉDUIRE LES RISQUE DE CHOC ÉLECTRIQUE, N'ENLEVEZ PAS LE COUVERT (OU LE PANNEAU ARRIÈRE). NE CONTIENT AUCUNE PIÈCE RÉPARABLE PAR L'UTILISATEUR.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. Read Instructions:
The Owner's Manual should be read and understood before operation of your unit. Please, save these

CONSULTEZ UN TECHNICIEN QUALIFIÉ POUR L'ENTRETIENT. Veuillez lire le manuel:
Il contient des informations qui devraient êtres comprises avant l'opération de votre appareil. Conservez S.V.P. ces instructions pour consultations ultérieures

instructions for future reference.

Packaging:
Keep the box and packaging materials, in case the unit needs to be returned for service.

Emballage:
Conservez la boite au cas ou l'appareil devait être retourner pour réparation.

Warning:
When using electric products, basic precautions should always be followed, including the following:

Warning:
Attention: Lors de l'utilisation de produits électrique, assurez-vous d'adhérer à des précautions de bases incluant celle qui suivent: Alimentation:
L'appareil ne doit être branché qu'à une source d'alimentation correspondant au voltage spécifié dans le manuel ou tel qu'indiqué sur l'appareil. Cet appareil est équipé d'une prise d'alimentation polarisée. Ne pas utiliser cet appareil avec un cordon de raccordement à moins qu'il soit possible d'insérer complètement les trois lames. Des précautions doivent êtres prises afin d'eviter que le système de mise à la terre de l'appareil ne soit désengagé.

Power Sources:
Your unit should be connected to a power source only of the voltage specified in the owners manual or as marked on the unit. This unit has a polarized plug. Do not use with an extension cord or receptacle unless all three blades can be fully inserted to prevent blade exposure. Precautions should be taken so that the grounding scheme on the unit is not defeated.

Power Cord:
The AC supply cord should be routed so that it is unlikely that it will be damaged. If the AC supply cord is damaged DO NOT OPERATE THE UNIT.

Service:
The unit should be serviced only by qualified service personnel.

Cordon d'alimentation:
Évitez d'endommager le cordon d'alimentation. N'UTILISEZ PAS L'APPAREIL si le cordon d'alimentation est endommagé.

Service:
Consultez un technicien qualifié pour l'entretien de votre appareil.

YS No. 6405 6438 6825 6827 6824 6463 5101 5102 5119 6774 6917 6918 6882 5400 5402 5410 5417 5420 5428 5432 6451 5376 5834 5304 6435 5306 5314 5255 5257 5259 5281 5260 5961 5265 5267 5887 4409 4406 711 8547 3467 3489 3491 3682 3498 3523 3527 3451 3414 2468 2410 8459 8604 3563 3800 3804 3795 3799 3803 3810 3827 8693 3481 3834 8800 8841 8898 3830 4597 4599 4729 4815 4618 4817 4692 4852 4867 4873 4623 4823

Description RED 3MM LED 1V7 5MA BRIGHT PACE 1N4004 400V 1A0 DIODE T&R 1N4148 75V 0A45 DIODE T&R 1N5402 200V 3A0 DIODE 1N5246B 16V0 0W5 ZENER 5% T&R 1N5251BRL 22V0 0W5 ZENER 5% T&R BC550C TO92 NPN TRANS. T&R BC560C TO92 PNP TRANS. T&R 2N5638 TO92 N CHAN J FETT&R BD139 TO126 NPN TRANS BDV64B TO218 PNP DARLINGTON BDV65B TO218 NPN DARLINGTON TL072CP IC FET DUAL OP AMP _10P 100V 10%CAP T&R TUBULAR NPO _15P 100V 10%CAP T&R TUBULAR NPO 100P 100V 10%CAP T&R BEAD NPO 330P 50V 10%CAP T&R BEAD NPO 680P 50V 10%CAP T&R BEAD NPO __3N3 50V 10%CAP T&R TUBULAR Y5R __4N7 50V 10%CAP T&R TUBULAR Y5R __4N7 250V 20%CAP AC Y ONLY RAD10MM __6N8 50V 5%CAP T&R BEAD X7R _10N 250V 20%CAP RAD POLYFILM BULK _22N 50V 10%CAP T&R BEAD X7R _22N 275V 20%CAP AC X2 RAD BLK15MM _33N 50V 10%CAP T&R BEAD X7R 100N 50V 10%CAP T&R BEAD X7R __1U 63V 20%CAP T&R RADIAL ELE.2" __2U2 63V 20%CAP T&R RADIAL ELE.2" __4U7 63V 20%CAP T&R RADIAL ELE.2" _10U 16V 20%CAP NONPOLAR T&R .2" _22U 50V 20%CAP T&R RADIAL ELE.2" _33U 16V 20%CAP NONPOLAR T&R RAD _68U 25V 20%CAP T&R RADIAL ELE.2" 100U 25V 20%CAP T&R RADIAL ELE.2" 2200U 50V 20%CAP RADIAL ELECT BULK _10K 5C-REV/AUDIO STYLE"P14"16MM _50K 5B-LINEAR STYLE"P14"16MM 30 X 50 X 1.5MIL PLASTIC BAG PLASTIC FOOT BLACK CLIP 205X032 14-16AWG DISC/INSUL CLIP 250X032 18-22AWG DISCO/INSL CLIP 205/187X020 18-22AWG DISCO/INS 250 MALE PCB TAB BULK ON CATRIGE M203-02 PLAIN PC MNT JK SKT M203-02A GOLD TIP PC MNT JK SKT M203-02B GLOD SLV PC MNT JK SKT 0.089 OD SMALL EYELET ELECTROPLATED INTERNATIONAL PC MOUNT FUSEHOLDER 0.800 AMP SLO-BLO .25X1.25 FUSE 4.0 AMP FAST-BLO .25X1.25 FUSE 9.5" STRAP HANDLE, PLASTIC COVERS 10-32 T NUT TRANSISTOR MOUNTING BRACKET BELLY BUTTON #BB1 CORDS CANADA SNAP ON 1.5" INSULATING BUSHING #8 GROUND LUG ZIERICK 505-169 ROUND BUMPER BUTTON BLACK NYLON SECUR-A-TACH MINI PLASTIC TIE 4" NYLON CABLE TIE SQUARE BUMPER BUTTON BLACK S ROTARY KNOB GREY 8? 3/18 SJT AC LINE CORD 250 CLIPS HEYCO #1214 STRAIN RELIEF 6-32 KEPS NUT ZINC 10-32 KEPS NUT ZINC 1/4-20 CAGE NUT C7998142027 TO218 PREGREASED MICA 56-78-2AP 22AWG STRAN TC WIR 22AWG SOLID SC WIR T&R 5.0W 0R27 5% BLK RES 1/4W 12R 5% T&R RES 1/2W 22R 5% T&R RES 1/4W 47R 5% T&R RES 5.0W 100R 5% BLK RES 1/4W 100R 5% T&R RES 1/4W 270R 5% T&R RES 1/4W 680R 5% T&R RES 1/2W 1K 5% T&R RES 1/4W 1K 5% T&R RES

Qty.
1 2 5 4 2 1 1 2 1 1 1 1 2 3 1 2 1 6 1 1 1 2 1 1 1 1 5 1 1 1 2 1 1 1 2 2 1 3 1 4 2 2 2 9 1 1 1 4 6 1 2 1 2 1 2 1 1 1 1 6 1 4 1 1 7 2 4 2 6 20 2 2 1 1 1 1 2 3 2 1

YS No. 4824 4825 4847 4826 4829 4830 4832 4834 4838 4844

Description 1/4W 1K5 5% 1/4W 1K8 5% 1/4W 2K2 5% 1/4W 3K3 5% 1/4W 10K 5% 1/4W 15K 5% 1/4W 22K 5% 1/4W 47K 5% 1/4W 100K 5% 1/4W 1M 5%

Qty.
T&R RES T&R RES T&R RES T&R RES T&R RES T&R RES T&R RES T&R RES T&R RES T&R RES 3 1 5 6 4 3 5 2 2 2

9815 8801 8828 8876 8624 8756 8781 8843 8770 8905 8656 7337 3511 8852 8817 3698 3940 3941 3943 3949 3958 1309

1/2" POPLAR SELECT 1 4X4 ONLY 6-32 X 3/8 PAN PH TAPTITE SJ500 6-32 X 3/4 PAN PH TAPTITE SJ500 #6 X 1 1/2 PAN PH TYPE A SJ500 10-32 X 1/2 HEX HD MS JS500 BLK #10 X 3/4 PAN PH TYPE A JS500 BLACK #10 X 7/8 FLAT PHIL TYPE A JS500BLK 10-32 X 1 1/8 FLAT PH MS SJ500 1/4-20 X 1 5/16 TRUSS PH MS JS500 YORKVILLE PRODUCT SCHEMATIC .171 X 1/4 NYLON SPACER #SP42 10" 4R 50W SPEAKER BASS GUITAR #6 FLAT WASHER NYLON #6 INTERNAL TOOTH LOCKWASHER #10 FLAT WASHER BLACK OXIDE SPST ROKR SW QUIK 180" AC PWR BL/BL RED 18 AWG TR-64 PREFUSED BLACK 18 AWG TR-64 PREFUSED GREEN 22 AWG TR64 PREFUSED WIRE 18AWG GRN/YLLW STRANDED WIRE BLACK 18AWG 36STND WIRE DOUBLE INS BLOC-40B/40K/40W/50B XFMR

0.21 2 6 4 2 8 6 2 4 1 5 1 2 1 2 1 2.166 2.166 0.25 0.416 1.333 1

safe_v3.doc Version 3.5 Mar 98

-16V

+16V C12 100N C13 100N C1 4N7 C2 680P

+16V

R3 2K2 D11 2 3

J1 1 3 5 INPUT
S R T

SG R1 10K

C3 330P R105 2K2 R106 680R 1 U1
1/2

GOLD-T 2 4 6

TLO72 33U C4 R2 16V R4 1M D12 100R

C56 100N SG R5 680R 16V C5 10K 10U C6 CW 10U 16V 5C P1GAIN SG

C7 22N 50K R6 CW 15K BASS B P2 R8 47K 6N8 C8 MID B P3
CW

R7 15K

C33 100P 6 7 5 U1
1/2

R43 22K

6 5 SG

C59 100P R110 22K 7 U2
1/2

5 3 1 J4
T R S

LINE_OUT

6 4 2 NO-GOLD WC6 SG

R9 3K3

SG

SG

SG -16V

22V 5251B ZD4 2K2 R40 1N4004 D6 D7 1N4004

C29 25V 1U

R41 10K 1M R42 D8

C31 25V 2U2 AG Q7

50K C9 6N8 C10 TREBLEB P4 680P R45 R46 CW 50K 3K3 3K3 C11 680P R15 22K R14 1K8 BC560

R44 100K R10 3K3

TLO72

SG

TLO72 C57 3N3 R107 R108 22K 22K R109 1K C58 100N SG

2 1 3 U2
1/2

R11 270R

TLO72

C14 33N R12 10K

+33VDC R16 3K3 C18 25V 68U R17 47K 10p C20 680P R21 R23 680R 10K R22 270R C19 15P Q4 BD139 R25 47R R24 15K Q3 BC550C BDV65B Q5 AG 5 3 1 J5
T R S

C16 16V 22U AG BC560 Q1 Q2

R20 3K3

R26 12R

PHONES

+33VDC D1
F2 4A-FB

120Vac AG 60Hz C32 22n 1309 SW1

1N5402 D3 1N5402 D4 AG
F3 4A-FB

SG C26 40V 2200U R38
0.5W

C28 25V 100U

16V 5246B ZD3

D10 R13 100K

C15 680P

R18 2K2 C17 10V 4U7 AG R19 2K2

TP2
R27 12R Q6 680P BDV64B C22

AG

C30 4n7 WHITE

1N5402 -33VDC LD1
RED

1K R39
0.5W

0.8A-SB

F1

-16V AG AG

BLACK GREEN

1K R35 1K5

CUT OUT R23, R24 UNTIL 2 TO 4mV IS ACROSS TP1 AND TP2 WITH AMP COLD

-33VDC NOTE: ALL UNMARKED DIODES 1N4148

AG THE 50B BY A.WILSON AND C.CHIU

M510.SCH_DATABASE_HISTORY
1 MAR/30/95 2 MAY/01/95 3 JUN/01/95 4 DEC/09/97 5 D 6 D 7 D 8 D 9 D 10 D

BDV65B BDV64B BD139 2N5638

BC550C BC560C

MODEL(S):- BM50 # DATE VER# DESCRIPTION OF CHANGE
3.20 3.30 3.40 3.50 V V V V V V

PRIMARY_FUSE_0.6ASB->0.8ASB PC#4781)D6/D7_BAV21->1N4004 PC#4801_ADD_10p_ACROSS_R17 REBADGED_AS_BASSMASTER_50 N N N N N N

DSG ECB B C E

CBE

DATE: DEC/09/97

MODELS: BASS-MASTER_50 PCB#&VER: M510

0.5W

5W

T1

1N5402 D2

C25 40V 2200U

R36 1K5 R37 1K5

5W

C27 25V 100U

16V 5246B ZD2

D9

C21 100N

5W

AG +16V

2N5638

6 4 2 GOLD_S

TP1

R28 0R27

100R R31
SPKR1 10"4R-50W #7337

22R R29 0R27 R30 POLY C23 10N

SCH ISSUE: 3.50 TITLE: BASS_AMP_BM50

YORKVILLE NAME: BM50.SCH

-16V

+16V C12 100N C13 100N C1 4N7 C2 680P

+16V

R3 2K2 D11 2 3

J1 1 3 5 INPUT
S R T

SG R1 10K

C3 330P R105 2K2 R106 680R 1 U1
1/2

GOLD-T 2 4 6

TLO72 33U C4 R2 16V R4 1M D12 100R

C56 100N SG R5 680R 16V C5 10K 10U C6 CW 10U 16V 5C P1GAIN SG

C7 22N 50K R6 CW 15K BASS B P2 R8 47K 6N8 C8 MID B P3
CW

R7 15K

C33 100P 6 7 5 U1
1/2

R43 22K

6 5 SG

C59 100P R110 22K 7 U2
1/2

5 3 1 J4
T R S

LINE_OUT

6 4 2 NO-GOLD WC6 SG

R9 3K3

SG

SG

SG -16V

22V 5251B ZD4 2K2 R40 1N4004 D6 D7 1N4004

C29 25V 1U

R41 10K 1M R42 D8

C31 25V 2U2 AG Q7

50K C9 6N8 C10 TREBLEB P4 680P R45 R46 CW 50K 3K3 3K3 C11 680P R15 22K R14 1K8 BC560

R44 100K R10 3K3

TLO72

SG

TLO72 C57 3N3 R107 R108 22K 22K R109 1K C58 100N SG

2 1 3 U2
1/2

R11 270R

TLO72

C14 33N R12 10K

+33VDC R16 3K3 C18 25V 68U R17 47K 10p C20 680P R21 R23 680R 10K R22 270R C19 15P Q4 BD139 R25 47R R24 15K Q3 BC550C BDV65B Q5 AG 5 3 1 J5
T R S

C16 16V 22U AG BC560 Q1 Q2

R20 3K3

R26 12R

PHONES

+33VDC D1
F2 4A-FB

230Vac AG 50Hz C32 22n 1206 SW1

1N5402 D3 1N5402 D4 AG
F3 4A-FB

SG C26 40V 2200U R38
0.5W

C28 25V 100U

16V 5246B ZD3

D10 R13 100K

C15 680P

R18 2K2 C17 10V 4U7 AG R19 2K2

TP2
R27 12R Q6 680P BDV64B C22

AG

BROWN GRN/YELL

1N5402 -33VDC LD1 BLUE
RED

1K R39
0.5W

T400MA

F1

-16V AG AG

1K R35 1K5

CUT OUT R23, R24 UNTIL 2 TO 4mV IS ACROSS TP1 AND TP2 WITH AMP COLD

-33VDC NOTE: ALL UNMARKED DIODES 1N4148

AG THE 50B BY A.WILSON AND C.CHIU

M510.SCH_DATABASE_HISTORY
1 MAR/30/95 2 MAY/01/95 3 JUN/01/95 4 DEC/09/97 5 D 6 D 7 D 8 D 9 D 10 D

BDV65B BDV64B BD139 2N5638

BC550C BC560C

MODEL(S):- BM50E # DATE VER# DESCRIPTION OF CHANGE
3.20 3.30 3.40 3.50 V V V V V V

PRIMARY_FUSE_0.6ASB->0.8ASB PC#4781)D6/D7_BAV21->1N4004 PC#4801_ADD_10p_ACROSS_R17 REBADGED_AS_BASSMASTER_50 N N N N N N

DSG ECB B C E

CBE

DATE: DEC/09/97

MODELS: BASS-MASTER_50 PCB#&VER: M510

0.5W

5W

T1

1N5402 D2

C25 40V 2200U

R36 1K5 R37 1K5

5W

C27 25V 100U

16V 5246B ZD2

D9

C21 100N

5W

AG +16V

2N5638

6 4 2 GOLD_S

TP1

R28 0R27

100R R31
SPKR1 10"4R-50W #7337

22R R29 0R27 R30 POLY C23 10N

SCH ISSUE: 3.50 TITLE: BASS_AMP_BM50E

YORKVILLE NAME: BM50E.SCH

"529.01X "052.21 =EZIS KNALB BLANK SIZE= 12.250" X 10.925"
TOP Q3 NB Q5 PLACE THE TOP OF Q3 AGINST THE UPPER PART OF ROUTED AREA. BC550C J19 BEND BOTTOM LEADS OF Q3 TOWARDS FRONT OF BOARD. BEND Q3 DOWN INTO ROUTED AREA AS SHOWN. BDV64B J20 J21 Q6 C32 250TAB 250TAB
XFMR_PRI AC_BLK AC_WHT

BDV65B J16 J17 J18

Q3 J11 C18 270R 680R 100N 680P

XFMR_PRI

TAB1 WC1 C30 12R R27

0.8A-SB AC_LINE

250TAB

250TAB

22N 400V 4N7 250V

#3414

N.B

F1

TAB2

10K

15K

3K3

TAB8 250TAB

R15

M510 50B VER-3.20
R29
J4 C29 J3
Q7 2N5638
1N4148

680P

12R

22K

WC2

WC3

5W 0R27

J22

C21 R20

R16

C22 J10

R22

R21

R23

R24 J13

D2 1N5402 D4
1N5402

J14

R26

C20

D1

0R27 5W

DOWN

Q2

10K

2K2

22V

1M

1K8

2K2

22R 0.5W

DOWN

R42 ZD4 D8

R41

R28

10N 100V C23

TAB6

C31

R40

BD139

D3

J12 R107 R14 R108 R18 R109

R17 C24

C19 R25

R19

R13 C15

D10

02.3-015M D11 D12 C12 C13 Q4

J2

R30

J1

BC560 Q1 C57

C28
1N4148

2200u 50V 2200u 40V

SHEAR

R3 R105 R106 R44 C33 C10

1N4148

1K5

J101

10K

1N4148

J15

1N4148

100N 100N

3N3 C59

22K

22K 1K

100U 25V

1K5

16V

16V

J5

U1

R110 22K 100P U2 TLO72

0.5W 1K 0.5W 1K

100U 25V

C26
J23

ZD3

J6

ZD2

J9

J8

R12

C4

R10 C8

R7

R37

R39 R38 D9
33N

C27

R36

TLO72 330P 4N7 10K 680P

2K2 2K2 680R 100K 100P 680P

22K

C58

J50

R43

R2 JB1

C56 R8

16V 33U

15K 100N

R6 R9

1M GOLD

C3 C1

C6

JB4
C14 270R 3K3 6N8 3K3 3K3

JB5

5W 100R R31

C5 100R R4

R5 680R

16V 10U

+

100N 47K

15K 3K3

R11

5C10K VOLUME R1 C2 INPUT

22N B BASS 50K

6N8 50K MID B

R46 R45

C7

LINE_OUT

P1

P2

P3

P4

ASSEMBLY

RED + LED1

GOLD_S PHONES

1K5

C9

C11 680P B TREBLE 50K

R35

10U 16V

WC6

M510_3.20

VCD
M510.PCB_DATABASE_HISTORY
MODEL(S):- 50B # DATE VER# DESCRIPTION OF CHANGE
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 SEP/12/94 . MAY/01/95 MAY/09/95 D D D D D D D D D D D D D D D D 3.10 . 3.20 3.30 V V V V V V V V V V V V V V V V PC#4625_HOLES_ADDED_FOR_RADIAL PWR_SUPPLY_CAP PC#4781_D6/D7__BAV21-->1N4004 PC#4801_ADD_10P_ACROSS_R17 NOW_ADDED_IN_AUTO-INSERTION N N N N N N N N N N N N N N N

PRODUCTION NOTES 1 2
CUT ALL NECESSARY LEADS THAT ARE PROTRUDING FROM THE BOTTOM OF BOARD SUCH AS WC'S, FUSE HOLDER LEGS, DIODE LEADS, ETC, SO THAT THE DISTANCE BETWEEN BOARD AND CHASSIS COULD BE KEPT TO A MAXIMUM. WC1 AND WC3 BLACK 18AWG WIRES FOR N.A. BLACK DOUBLE/INSUL. FOR S WC2=3"GRN AND WC6=5"GRN GREEN WIRES FOR N.A. WC6 GRN/YELL WIRE FOR S VERSION ADD TUBING TO S VERSION WIRE WC2/WC3 NO WIRE FOR S VERSION DO NOT STUFF C30 OR F1 FUSEHOLDER FOR S VERSION

3 4

SHEAR

#3414

T2A SECONDARY 4A-FB

F3

DOWN

BAR

BAR

BC560

SEC_GND

10V 4U7

1N5402

16V FUNCTION 22U

47K 10P

15P 47R

2K2

+

100K 680P

+

250TAB

SEC_IN

+ 25V 2U2

2200u

SEC_IN

AZ HOLE

C16

C17

250TAB

+

250TAB TAB5

50V 2200u

DOWN

BAR

BAR

OUT(+)

1U 25V

40V

1N5402

TAB7

TAB9 250TAB

OUT(-)

C25
#3414
1N4004 1N4004

D6 D7

T2A SECONDARY 4A-FB

F2

25V 68U

3K3

TAB3

TAB4