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ACOUSTIC MASTER

WEB ACCESS: http://www.yorkville.com

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

SERVICE MANUAL
Manual-Service-am50-1v1.pdf

TYPE: AM50

Quality and Innovation Since 1963
Printed in Canada

#
1

Part#
3450 4417 4420 4420 4419 3660 4418 4417 8641 3698 3421 8649 Z282 3834 8570 8468 3481 8459 8547 7417 7331

Description
1/4" JCK PCB MT HORZ, GOLD

Function
Jack Gain 1 Bass Treble Freq Jack Gain 2 Reverb Knob
YS No. 6405 6408 6825 6438 6827 6822 6824 5105 6755 6798 6840 6882 6889 5402 5199 5410 5420 5422 5208 6451 5204 5207 6435 5308 5310 5228 5314 5230 5317 5231 5233 5234 5255 5256 5257 5945 5961 5267 5630 5887 4417 4418 4420 4419 8547 8570 3463 3467 3489 3682 3498 3886 3890 3914 3417 3660 3451 3414 2468 8459 8604 7417 3745 3804 3795 3801 3803 3810 8641 8649 3481 3834 8800 8787 8845 8898 3830 8581 4597 4599 5299 4675 4816 4704 4897 4857 Description RED 3MM LED 1V7 5MA BRT GRN 3MM LED 1V9 5MA FROSTED 1N4148 75V 0A45 DIODE T&R 1N4004 400V 1A0 DIODE T&R 1N5402 200V 3A0 DIODE 1N4745A 16V0 1W0 ZENER 5% T&R 1N5246B 16V0 0W5 ZENER 5% T&R MPSA13 TO92 NPN DARL T&R TA LM3876T IC 40 WATT POWER AMP MC4741CP IC QUAD OP AMP MC33078P IC DUAL OP AMP TL072CP IC FET DUAL OP AMP TLO74CN IC QUAD O/A T.I ONLY _15P 100V 10%CAP T&R BEAD NPO 100P 100V 2%CAP T&R RAD CER.2"NPO 100P 100V 10%CAP T&R BEAD NPO 680P 50V 10%CAP T&R BEAD NPO __1N 50V 10%CAP T&R BEAD NPO __2N2 400V 5%CAP T&R RAD .2"FLM __4N7 250V 20%CAP BLK 'Y' 10MM AC _10N 100V 10%CAP T&R RAD .2"FLM _18N 100V 5%CAP T&R RAD .2"FLM _22N 275V 20%CAP BLK 'X2' 15MM AC _47N 50V 10%CAP T&R BEAD X7R _68N 50V 10%CAP T&R BEAD X7R 100N 100V 5%CAP T&R RAD .2"FLM 100N 50V 10%CAP T&R BEAD X7R 180N 63V 5%CAP T&R RAD .2"FLM 180N 50V 10%CAP T&R BEAD X7R 220N 63V 10%CAP T&R RAD .2"FLM 330N 63V 5%CAP T&R RAD .2"FLM 470N 63V 10%CAP T&R RAD .2"FLM __1U 63V 20%CAP T&R RAD .2"EL __1U 63V 5%CAP T&R RAD .2"FLM __2U2 63V 20%CAP T&R RAD .2"EL _10U 63V 20%CAP T&R RAD .2"EL _33U 16V 20%CAP T&R RAD .2"NP 100U 25V 20%CAP T&R RAD .2"EL 330U 25V 20%CAP BLK 10X13MM EL 2200U 50V 20%CAP BLK 18X27MM EL _10K 5B LIN 9MM HORIZONTAL P28 _10K 5C R/A 9MM HORIZONTAL P28 _50K B LIN 9MM HORIZONTAL P28 100K B LIN 12MM HORIZONTAL STP27 PLASTIC FOOT BLACK CORNER, 2 LEGS NOTCED LIP BLACK CLIP 110X020 18-22AWG DISCO/INSL CLIP 205X032 14-16AWG DISC/INSUL CLIP 250X032 18-22AWG DISCO/INSL 250 MALE PCB TAB BULK CARTRIGE 1/4" JCK PCB MT HORZ 36" RCA PREFAB CABLE RED 36" PREFAB. CABLE RCA SNGL PCB MT HORZ 6-32 SCREW TERMINAL PC MOUNT XLR FEML PCB MT HORZ EYELET SMALL 0.089 OD PLATED INTERNATIONAL PC MOUNT FUSEHOLDER 0.800 AMP SLO-BLO .25X1.25 FUSE 9.5" STRAP HANDLE, PLASTIC COVERS 10-32 T NUT 8R 30W TWEETER PIEZO TLC 1 DUAL XSISTOR PBL SPRING PLATE ZN SNAP ON 1.5" INSULATING BUSHING #8 GROUND LUG ZIERICK 505-169 5/8" BUMPER BUTTON BLACK NYLON SECUR-A-TACH MINI PLASTIC TIE 4" NYLON CABLE TIE AQUA KNOB FOR "NEW" ACOUSTIC SERIE BUTTON KNOB FLAT BLACK 8' 3/18 SJT AC LINE CORD 250 CLIPS HEYCO #1214 STRAIN RELIEF "Y" LOGO ACOUSTIC SERIES SML. DOMED 6-32 KEPS NUT ZINC 8-32 KEPS NUT ZINC 10-32 PEMNUT SS-032-2-Z1 1/4-20 CAGE NUT C7998142027 TO218 PREGREASED MICA 56-78-2AP CUSTOM PBL TRANSISTOR SPACER 22AWG STRAN TC WIR JMP 22AWG SOLID SC WIR T&R JMP 24AWG SOLID SC WIR RAD JMP 1/2W 10R 5% T&R RES 1/4W 33R 5% T&R RES 5.0W 33R 5% BLK RES 1/4W 120R 5% T&R RES 1/4W 220R 5% T&R RES

Labeled Components

am50 Oct 20,2000
Qty. 2 1 7 1 4 2 1 2 1 1 1 4 2 2 2 3 2 4 2 1 2 2 1 1 1 1 15 1 1 2 1 1 3 2 1 1 2 3 2 2 2 1 2 1 8 6 2 2 4 10 3 1 1 2 2 1 10 2 1 1 2 1 1 1 2 1 1 5 6 1 1 1 1 3 2 2 2 1 1 7 41 2 2 1 1 2 4 YS No. 4770 4655 4799 4981 4824 6113 4883 4827 4639 4893 4863 4800 4829 6116 4830 6123 4840 4834 4803 4836 6120 4849 4844 3586 9892 9047 9150 9250 9815 8842 8801 8829 8828 8876 8763 8767 8815 8753 8756 8781 8912 8770 8905 3833 7331 8820 8473 3421 3698 3937 3940 3941 3950 3958 1309 Description 1/4W 249R 1% T&R RES 1/2W 330R 5% T&R RES 1/4W 562R 1% T&R RES 1/4W 1K 5%MINI T&R RES 1/4W 1K5 5% T&R RES 1/4W 2K 5%MINI T&R RES 1/4W 2K49 1% T&R RES 1/4W 4K7 5% T&R RES 1/4W 4K99 1% T&R RES 1/4W 5K1 5% T&R RES 1/4W 8K2 5% T&R RES 1/4W 10K0 1% T&R RES 1/4W 10K 5% T&R RES 1/4W 10K0 1%MINI MF T&R RES 1/4W 15K 5% T&R RES 1/4W 20K0 1%MINI MF T&R RES 1/4W 33K 5% T&R RES 1/4W 47K 5% T&R RES 1/4W 49K9 1% T&R RES 1/4W 68K 5% T&R RES 1/4W 100K 5%MINI T&R RES 1/4W 180K 5% T&R RES 1/4W 1M 5% T&R RES ACC# 1BB1C1C SHORT REVERB CABINET COVER, BLUE/BLACK, 54" WIDE .187 HOLE @ .250 STAG 16GA PERFORAT .081" 48X96 UTILITY ALUMINUM .040" 48X96 5052H32 ALUM VINYL LAMI 1/2"PRECISION SANDED SPRUCE 4X8 #4 X 5/16 PAN QUAD TYPE A JS500 BLK 6-32 X 3/8 PAN PH TAPTITE JS500 6-32 X 3/8 FLAT PH TAPTITE BO#4 HEA 6-32 X 3/4 PAN PH TAPTITE JS500 #6 X 1 1/2 PAN PH TYPE A JS500 BLK 8-32 X 1/2 PAN PH MS JS500 BLACK #8 X 3/4 PAN PHIL TYPE A JS500 BLK 8-32 X 3/4 PAN PH TAPTITE JS500 #10 X 1/2 PAN PH TYPE A JS500 BLACK #10 X 3/4 PAN PH TYPE A BLACK OXIDE #10 X 7/8 FLAT PHIL TYPE A JS500BLK 10-32 X 1 FLAT PHIL MS JS500 BLK 1/4-20 X 1 5/16 TRUSS PH MS JS500 YORKVILLE PRODUCT SCHEMATIC 8 X 3/8 (250 OD,.171 ID)NY SPACER 8" 8R 50WPGM SPEAKER JENSENJA8/80 #8 FLAT WASHER JS500 #10 BLACK CUPWASHER SWF-10BK DPDT PUSH SW PCMT MAKE B4 BREAK SPST ROKR SW QUIK 180" AC PWR BL/BL YELLOW 18 AWG TR-64 PREFUSED RED 18 AWG TR-64 PREFUSED BLACK 18 AWG TR-64 PREFUSED GREEN 18 AWG TR-64 PREFUSED BLACK 18AWG 36STND WIRE DOUBLE INS BLOC-40B/40K/40W/50B XFMR Qty. 2 8 2 3 3 3 1 5 4 1 2 12 9 3 2 2 2 2 1 1 5 2 1 1 11.5 1.4 2.13 0.33 8.16 2 5 4 3 4 2 4 1 12 8 10 4 2 1 3 1 2 2 1 1 2.333 2.333 4.667 2 3.333 1

IMPORTANT SAFETY INSTRUCTIONS

2

_10K 5B LIN 9MM HORIZONTAL P28 _50K B LIN 9MM HORIZONTAL P28 _50K B LIN 9MM HORIZONTAL P28 100K B LIN 12MM HORIZONTAL STP27 XLR FEML PCB MT HORZ _10K 5C R/A 9MM HORIZONTAL P28 _10K 5B LIN 9MM HORIZONTAL P28 Note: All pots use 8641 Aqua Knob SPST ROKR SW QUIK 180" AC PWR BL/BL DPDT PUSH SW PCMT MAKE B4 BREAK BUTTON KNOB FLAT BLACK AM50 Grill (special order while unit is in production only) HEYCO #1214 STRAIN RELIEF CORNER, 2 LEGS NOTCED LIP BLACK VELCRO STRAP 3/4"X22CM (VELSTRAP) 8' 3/18 SJT AC LINE CORD 250 CLIPS 9.5" STRAP HANDLE, PLASTIC COVERS PLASTIC FOOT BLACK 8R 30W TWEETER PIEZO TLC 1 8" 8R 50WPGM SPEAKER JENSENJA8/80

applicable to serial numbers 001xxxx

3 4 5 6 7 8 knob 9

INSTRUCTIONS PERTAINING TO A RISK OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSONS.
TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER SERVICEABLE PARTS INSIDE.

INSTRUCTIONS RELATIVES AU RISQUE DE FEU, CHOC ÉLECTRIQUE, OU BLESSURES AUX PERSONNES.
AFIN DE REDUIRE LES RISQUE DE CHOC ELECTRIQUE, N'ENLEVEZ PAS LE COUVERT (OU LE PANNEAU ARRIERE). NE CONTIENT AUCUNE PIECE REPARABLE PAR L'UTILISATEUR.

10 10 11 12 13 14 15 16 17 18 19

CAUTION:

AVIS:

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

CONSULTEZ UN TECHNICIEN QUALIFIE POUR L'ENTRETIENT.

Read Instructions: Packaging: Warning:

The Owner's Manual should be read and understood before operation of your unit. Please, save these instructions for future reference. Keep the box and packaging materials, in case the unit needs to be returned for service. When using electric products, basic precautions should always be followed, including the following:

Veuillez lire le manuel: Emballage: Warning:

Il contient des informations qui devraient êtres comprises avant l'opération de votre appareil. Conservez S.V.P. ces instructions pour consultations ultérieures Conservez la boite au cas ou l'appareil devait être retourner pour réparation. Attention: Lors de l'utilisation de produits électrique, assurez-vous d'adhérer à des précautions de bases incluant celle qui suivent:

1309 2468 3586 3745 3830 5105 5887 6755 6798 6827 6840 6882 6889 8581

BLOC-40B/40K/40W/50B

Internal Electronic Components
XFMR

0.800 AMP SLO-BLO .25X1.25 FUSE ACC# 1BB1C1C SHORT REVERB DUAL XSISTOR PBL SPRING PLATE ZN TO218 PREGREASED MICA 56-78-2AP MPSA13 LM3876T TO92 NPN DARL T&R TA IC 40 WATT POWER AMP 2200U 50V 20%CAP BLK 18X27MM EL MC4741CP IC QUAD OP AMP 1N5402 200V 3A0 DIODE MC33078P IC DUAL OP AMP TL072CP TLO74CN IC FET DUAL OP AMP IC QUAD O/A T.I ONLY

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 the plug can be fully inserted. Precautions should be taken so that the grounding scheme on the unit is not defeated.

Alimentation:

Hazards:

Do not place this product on an unstable cart, stand, tripod, bracket or table. The product may fall, causing serious personal injury and serious damage to the product. Use only with cart, stand, tripod, bracket, or table recommended by the manufacturer or sold with the product. Follow the manufacturer's instructions when installing the product and use mounting accessories recommended by the manufacturer. The apparatus should not be exposed to dripping or splashing water; no objects filled with liquids should be placed on the apparatus. Terminals marked with the "lightning bolt" are hazardous live; the external wiring connected to these terminals require installation by an instructed person or the use of ready made leads or cords. No naked flame sources, such as lighted candles, should be placed on the apparatus.

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.

CUSTOM PBL TRANSISTOR SPACER

Hazard:

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.

Ne pas placer cet appareil sur un chariot, un support, un trépied ou une table instables. L'appareil pourrait tomber et blesser quelqu'un ou subir des dommages importants. Utiliser seulement un chariot, un support, un trépied ou une table recommandés par le fabricant ou vendus avec le produit. Suivre les instructions du fabricant pour installer l'appareil et utiliser les accessoires recommandés par le fabricant. Il convient de ne pas placer sur l'appareil de sources de flammes nues, telles que des bougies allumées. L'appeil ne doit pas être exposé à des égouttements d'eau ou des éclaboussures et qu'aucun objet rempli de liquide tel que des vases ne doit être placé sur l'appareil. Les dispositifs marqués d'une symbole "d'éclair" sont des parties dangereuses au toucher et que les câblages extérieurs connectés à ces dispositifs de connection extérieure doivent être effectivés par un opérateur formé ou en utilisant des cordons déjà préparés.

Notes:

Service:

Cordon d'alimentation: Service:

The unit should be serviced only by qualified service personnel.

Évitez d'endommager le cordon d'alimentation. N'UTILISEZ PAS L'APPAREIL si le cordon d'alimentation est endommagé. Consultez un technicien qualifié pour l'entretien de votre appareil.

SAFE_V4.doc Version 4.0 02/11/99 11:54 AM

parts-am50.xls - 10/23/00

ftp.yorkville.com/parts

Instrument Amplifiers

Block Diagram for AM50
D E S I G N E D A N D M A N U FAC T U R E D B Y Y O R K V I L L E S O U N D
Channel 1 Clip LED Channel 2 Clip LED

Channel Inputs
Input 1 Gain Pot

Speaker Outputs
EQ Tweeter 8 Ohms OUT Contour Filter Notch IN AMP +

Low / High Channel 1 Unbalanced

In 1

Notch Filter

Stereo 1/4" +

8 Ohms

XLR Balanced Input 2 Gain Pot

Reverb Gain Stage
Channel 2 Balanced In 2 Stereo 1/4" Buffer

Reverb Send RCA

Reverb Return RCA

Reverb Gain Stage

Reverb Pot

BLOCK-DIAGRAM-AM50-1V4 .ai
C:\ADATA\block diagrams\BLOCK-DIAGRAM-AM50-1V4.ai 18-JUL-2003 SE

CLIP +16V R70 1K
RED

C27 100N Q10 A13

D31 D26 R65 100K

LED2

LG

R105 10K

D60 R60 C100 1U 63V NOTCH R55 100K SG 10K0
OUT

C56 100P R61 6 5 4K99 7 U7 TL072 R62 4K99
2/2

6
T

4
R

2 NO_GOLD
S

CHANNEL 1 INPUT R8 SG 100MVRMS JB2 MONO 1
S

C4 100P R7 49K9 2 3 R3 1M SG SG 6 5 SG CLIP +16V R35 1K
RED

20K0 SW1 C1 15P C55 330N SG R59 20K0

LINE-OUT JB4

1Vrms

R63 249R R64 249R

R31 33K 1 C6 33U 16V R9 120R VOLUME 10K
CW

10K0

D6

C121 2U2 63V

5

3

1

IN

LINE OUT

C2 10N 3
R

R161 100K SG R1 2K R2 10K C61 18N 9 10 SG R83 15K 2 3 R89 10K0 SG U6
1/4

5
T

R4 10K0

U1

NO_GOLD 2

4

6

C3 100P

TL072

1/2

R45 C7 16V 100U 4K7 BASS

C10 100N 50K
CW

R15 13 12 SG 10K 14 U6 TL074 C23 180N
4/4

LG

R46 4K7 R47 C12 15P 1 U3 TL072 SG
1/2

5B P1 R10 10K0 7 U1 TL072
2/2

B P2

10K0 R14 R12 2 3 10K0 1 U5 TL074
1/4

R80 100K CW D B P6 7
2/4

10K0 R82 C60 18N R81 10K0 U5

IG

TREBLE B P4
CW

47K C11 R48 1N 1K

2 3

100K
CW

B NOTCH

D P6

R44 10K0 6 5 SG R43 5K U5

C19 16V 1u R101 10K C51 100P R100

NOTCH

8
3/4

50K

TL074 R50 4K75

TL074

C27A 100N Q10A A13 D26A

R40 100K D25 SG R65A 33K LG R41 2K49 13 12 SG R42 10K0 U5
4/4

C64 2N2 1 TL074 R84 10K R85 10K R90 33R C65 220N . SG R86 2K

C66 10N R87 2K

9 10 U6 C67 2N2 . SG
3/4

8 TL074

R103 10K SG

2 3

10K 1 U7 TL072
1/2

LED1

14

C62 470N

C63 100N

CHANNEL 2 INPUT JP4 3mVrms 2 MIC_IN 3 NUTRIX 1 R11 10K0 1
S

TL074 R18A 180K D10A C13 1N R5 562R 2 3 R6 562R R34 4K99 1 U2 33078 R49 4K99 C14 1N SG
1/2

VOLUME2 10K
CW

5C P5 120R R53 33U C9 16V 6 5 R52 180K 7 U2 33078
2/2

IG

C8 16V 100U

R26 8K2 2 C21 47N R25 4K7 SG R33 47K SG 9 10 13 6 5 3

C22 1N R27 8K2 U8
1/4

+35VDC

REVERB TANK #3586 6 1 R28 220R REV_SEND J11 2 1 RCA R30 220R NOTES: ALL UNMARKED DIODES ARE 1N4148 AC VOLTAGES MEASURED AT 1KHz AND WITH VOLUMES AT 10, TONES AT 0 C45 100N C43 100N C42 100N C50 100N C57 100N C150 100N C44 100N C58 100N SG SG +16V SG -16V SG SG C15 180N SG R16 1K5 REV_RTN J10 6 2 5 10K R18 5 C16 100P R17 68K 7 U10 TL072 P3 10K
CW 2/2

C68 7 U3 TL072
2/4

2 3 U10
1/2

68N 1 TL072 R91 10K

10U 63V C17A

BOG R20A 1K
9 1

POLY C21A 50V 1U BOG R22A 15K
5 3 7 10 8

100mvrms

JP3 MONO

3
R

5
T

R19 10K0

1N4004 D5A R24A POLY C23A 40V 220N 10R R25A
0.5W 5W

MC4741 7 U8 MC4741 8 U8 MC4741
3/4 2/4

C16A C18 2U2 680P 16V 5B REVERB BOG BOG SG 4K7 R51 R13A 100K C15A 680P

NO_GOLD 2

4 IG

6

U4
4

R29 220R

LM3876

33R
8R 8" #7322

RCA 1

BOG 16V 1N5246B ZD4A 100U 25V C18A BOG 10K R21A POLY C22A 50V 1U

10R R23A

0.5W

#7415 3.75" 4R

BOG
-35VDC

+35VDC 330R D1 RED EXPORT 230Vac 50Hz #1309E T1 BLK T1 120Vac AG 60Hz 400V C90 BLK 22n #1309 RED 1N5402 D2 1N5402 D3 1N5402 D4 1N5402 C91 4n7 250V GREEN WHITE LED3 AG
RED
0.8A-SB

12 R206 330R
0.5W

14 U8 MC4741
4/4

R32 220R

330R

R204 C25 40V 2200U
AG

0.5W

R207 330R R205
SG 0.5W

0.5W

+16V 16V 1N4745A ZD2 16V 1N4745A ZD3

C27 25V 330U C28 25V 330U

C152 100N C151 100N

C40 100N C41 100N

400V

SW1

250V 4n7
F1

YEL

C32 22n

AG

AG

C26 40V 2200U R201 330R R202
0.5W 0.5W

SG

330R R203 330R R39
0.5W 0.5W

-16V PIN OUTS PIN 1

F1

330R 1K5 R66 -35VDC

GRN/YEL

BLACK

LM3876T
10 11 4 5 6 7 8 9

MPSA43 MPSA56

BC550C BC560C

2N5638

EBC
V+ NC VOUTPUT NC NC GND NC(+) MUTE V_INV_IN+

CBE

DSG

STYLE "P27"

STYLE "P28"

1 2 3 4 5 6 7 8 9 10

MODEL(S):# DATE
JAN/18/00 MAY/03/00 MAR/22/01 OCT/06/03 D D D D D D

AM50 VER# DESCRIPTION OF CHANGE
1.20 1.30 1.40 1.50 V V V V V V

M571.SCH_DATABASE_HISTORY
ADD_HISTORY/POT_BLOCKS UPDATE_CE_PWR-SUPPLY PC#6358_E_VERSION_XFMR_#1206->1309E CORRECT_POLARITY_OF_HORN N N N N N N DATE: OCT/06/2003 MODELS: PCB#&VER: AM50 M571

1 2 3 4 5 6 7 8 9 10

MODEL(S):# REF
P1 P2 P3 P4 P5 P6 D D D D

VOLUME BASS REVERB TREBLE GAIN NOTCH F F F F

AM50 FUNCTION

M571.PCB_POT_LIST
#4417 #4420 #4417 #4420 #4418 #4419 N N N N 1 OF

T400mA

PART#

#8641 . . . . . K K K K

KNOB

JAN/2000 . . . . . D D D D 1.50

AS_OF

BROWN

1

BLUE

2 3

SHEET

1

SCH ISSUE:

YORKVILLE

NAME: M571.SCH

TITLE: AM50_ACOUSTIC_AMP

INPUT

OUTPUT

TO REVB INPUT
R29 R28 R30

100N
C27 D26 D31

RED

. RCA_JACK

WC10 WC6 R3
4148 4148

RIGHT 10K 1K5
MPSA13

PART#3914 JB11 1N 8K2 8K2

JB2
100K
R65 Q10 R8 C4 R7

R32

220R 220R 220R 220R

+

MC4741

VOLUME 10N C2

BOT

WIP

JAN/18/00 JAN/15/02 . . . AUG/26/02 D D D D D

TOP

BOT

WIP

TOP

P2

BOT

WIP

TOP

MODEL(S):- AM50 # DATE VER# DESCRIPTION OF CHANGE

TOPA WIPB BOTA TOPB BOTB WIPA

P6

VCD
C3

4148

4417

3.00 4.00 . . . 5.00 V V V V V

10K 5B BASS
R45 C57 C21 R46

C10

100N

J2 4420 C150 J3 U3 R18 R44 R16 C16 R17 -16V R12 J40 R50 C15 180N

RED
LED2
P1
R4 R27 R26 C22 C6 U1 J45 J39 R33 J9 J38 C42 C50 C23 R25 R39 R203 R202 R201 U8

100P 10K0 JB10 PART#3914 BLK . RCA_JACK 33u 16V 100U 25V 4K7 100N 47N
4148
D60 J7

10K0 100P 49K9

180K

C7

10K0
R10

TLO72CN

120R
R9 D6

47K TO REVB OUTPUT J37 J36 J35

CDV83- CDV83+

100N 4K7 47K
J8 R47

TLO72

100N 100N 180N 4K7

50K B
C11 R48 C12 R55 J6 18N C60

10K0 10K0 4K7
J5

10K 1K5 100P 68K

100U 25V

TREBLE

R21A

10K
ZD4A

1N 1K 15P 100K 63V 1U

330R 0.5W 330R 0.5W 0.5W 330R 0.5W 330R 16V/1W

16V

4420 C100

1U
ZD3 C22A J32

TLO72

2K49

50K B TLO74
R42 C43 C45 R81 J11 R43 R40 R80 U10

U5 100N 100N 63V 2U2

R41

-38VDC

J34 C28

D5A

1U
1N4004

C21A

M571.PCB_DATABASE_HISTORY

#6755

10K0
R14 C61 R82 18N C121 J12 C65 220N R90

10K0 10K0 5K1 100K 10K0 33R 10K0 10K0
R85 2N2 R84 R83 +16V R89 C64 100N 470N U6 J41 SG C62 C18

LM38x6

B 100K 4419 PART#

10K0

C27

330U 25V

330U 25V

J31

U4
16V/1W
J42 J43 R205 R207 +16V R206 C16A ZD2

ADD_POT_CHART PC#6250_MOVE_C2_AWAY_FROM_JB2 PC#6177_MOVE_RED_LED_NEW_SOLDER_ MASK_FOR_TABS_PC#6484_NEW_DRILL AND_MASK_FOR_RCA_JACKS MAKE_ALL_LED'S_SAME_LENGTH N N N N N

63V 1U
R161 C63

PCB MECH FUNCTION

100K 10K0 15K PART# NOTCH-ENABLE
R1

680P R13A C15A 2K
J44 R204

100K 680P R20A
GA

100N

WC11 SW1 J46

TLO74
J14 R86 R87

0.5W 330R 0.5W 330R 330R 0.5W 330R 0.5W
J110

1K 63V 10U

REF

P1 P2 P3 P4 P5 P6

JP3

C17A

33K
C40 Q10A R65A

2K
C67 2N2 J50 10N

J30 J15 C66 C41 R15 C68

68N
R91 D10 J29

J33 10K 100N 10K 15P
C1

R22A
J10A

15K R23A R25A

M571_5.00

MODEL(S):- AM50

RIGHT
MPSA13 R18A D26A C27 R11

VOLUME BASS REVERB TREBLE GAIN FREQ

33K
4148

100N
4148
D25

10K 1K

J28

10R 0.5W 10R 0.5W

J16

+ 10K0 RED - LED1 10K0

R19
R2 R35 C13

J18 J19 R34 C14 R49 R6 J20

J13

C26 562R

C25

FUNCTION PART# KNOB

1N 4K99 1N 4K99 PART#
JP4
C9

J27 J26

40V 2200U

562R

R5 J101

M571.PCB_POT_LIST

40V 2200U RTV

J21

J25 J24 33u 16V
BOT

AS_OF

JAN/2000 . . . . .

33078 100N
C58 4418 5C

U2

J47

SEC_GND

00.4_175M LTED LLIRD 00.5_175M EDISREDLOS

TAB8

250TAB

BLACK

100N GAIN 10K
WIP

C44

FUNCTION

SPKR(-)

RTV

25V 100U
TOP

180K 120R
P5
C8

R52

250TAB
TAB5 SEC_IN C51 J23 R100 R53

J75

TAB6 63V 1U 4K7
4417
BOT

BLACK

250TAB
R51 R103 C19

TAB9

250TAB

RED

SPKR(+)

100P 10K 10K 10K REV
5B R101 C151

FUNCTION

D3
J60 330N U7

D1
BAR
DOWN

BAR
DOWN

05MA 00.5-175M

100N

RED

10K

1K5
WIP TOP

TLO72
R66

1N5402
BAR C55 C152

PRODUCTION NOTES

1N5402
BAR

5W 33R

YELLOW

TWEET(+)

TAB10

FUNCTION

250TAB

P3

J48

D4
JB4
R59

DOWN

1N5402

DOWN

250TAB 4K99
R60 SEC_IN

1N5402
D2 GRN

100N 20K0 20K0 4K99 249R
100P R62 C56

TAB7
R61 TRANS PRIM

LEADS FOR D1,D2,D3 AND D4 OVER AND LAY FLAT ON PCB WIRE AT WC3 FOR CE FUSEHOLDERS FOR CE

249R

R63

+ GRN -

REPLACE WITH SAME VALUE FUSE NA 0.8A 250V SB CE T400MA 250V
R64
LED3

RTV

AC HOT 250TAB
.

AC RET 250TAB
.

TRANS PRIM

22N 400V 250TAB

F1

FUSE=0.8A SB

CSA-0.8A/250VS . AC_LINE #3414 CE-T400MA

FUNCTION

250V 4N7 TAB4 TAB2 TAB3 C30

7415 LESON

PART# SWITCH

P:\571CMP.PRN
R70 R105 GRN

GRN GRN
C18A

1 2 3 4 5 6 7 8 9 10 11

1M

J4

GRN 2K
4148

#4417 #4420 #4417 #4420 #4418 #4417

220N C23A

#8641 . . . . .

INPUT2

RTV

1 DO NOT CUT THE BEND THE LEADS 2 DO NOT INSTALL 3 DO NOT INSTALL
LINE-OUT GRN

AM50 M571-5.00

7331 8" 8 OHM JENSEN

R24A

WC1

C32 TAB1 250TAB

WC3 22AWG

FUNCTION

BLK

BLK

YEL

STYLE "P27"

STYLE P28

D0 NOT INSTALL THIS WIRE FOR CE

FOR S VERSION

N.

1206

6 1/2" GRN/YELL

LM38x6 63V 10U 25V 100U 1U 1U

220N SPKR(-) TAB8 BLACK 5W 33R TWEET(+) TAB10 YELLOW

PCB MECH M571_1.00

SPKR(+) TAB9 RED

NEUTRAL

AM50 EXPORT AC WIRING JUL 04, 2000

#8 48 6 L O C K WA S H E R
C HA S SIS

L INE

N.B

GRN REV-SEND RCA_JACK REV-RTN RCA_JACK TAB5J75 25V 330U 2200U 40V SEC_GND TAB7

SEC_IN TAB 6

25V 330U 2200U 40V MC4741 U8 TLO72 U10 63V 2U2

AC HOT RET AC

C32 22N 400V TAB1 PRIM TRANS TAB3 BLK WC1 TAB2 WC3 TAB4

SEC_IN

TRANS PRIM

FU SE=0.8A SB

180N

2N2

MPSA13

10N

TLO74

2N2

63V 1U 330N TLO72 100P U7

TLO7 2 U3

18N

GRN GRN WC10 WC6 100P GRN

100N 470N

TLO72CN 33u 16V

TLO74

NOTCH-ENABLE

MPSA 13

33078

U2
+ GRN LED3

AC_LINE

WHITE DBL/INS

BLACK DBL/INS
SWITCH PART#3702

L ED 2

RIGHT

63V 1U

25V 10N 100U VOLUME 10K 5B 63V 1U 4420 4420 50K B BASS TREBL E
W TO PIP T BO

4417

SW 1

25V 100U

RED

33u 16V

GRN LINE-OUT
P3

+

JP4

100K4419 B

GRN

RIGHT

4418 T BO TO P W IP GAIN 5C 10K

50K B

P5

WC11

+ RED LED1

4417 T B OTO P W IP REV 5B 10K

INPUT2

4N7 250V C30

AM50 M571-2.40

22AWG WC2

TOP AIPB A W BOT TOP B W IP A BOT B

P6

P2

W TO PIP T BO