Yorkville Sound YS4040 User Manual

WEB: www.yorkville.com

Manual-Service-ap4040-00-4v0.pdf

AP4040

WORLD HEADQUARTERS

CANADA

Yorkville Sound

550 Granite Court Pickering, Ontario

L1W-3Y8 CANADA

Voice: (905) 837-8481

Fax: (905) 837-8746

Quality and Innovation Since 1963

U.S.A.

Yorkville Sound Inc.

4625 Witmer Industrial Estate

Niagara Falls, New York

14305 USA

Voice: (716) 297-2920

Fax: (716) 297-3689

MODEL TYPE: YS4040

SERVICE MANUAL

Printed in Canada

IMPORTANT SAFETY INSTRUCTIONS

This lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of sufficient

magnitude to constitute a risk of electric shock to persons. Ce symbole d’éclair avec tête de flèche dans un triangle

équilatéral est prévu pour alerter l’utilisateur de la présence d’un « voltage dangereux » non-isolé à proximité de l’enceinte du produit qui pourrait être d’ampleur suffisante pour présenter un risque de choque électrique.

FOLLOW ALL INSTRUCTIONS SUIVEZ TOUTES LES INSTRUCTIONS

Instructions pertaining to a risk of fire,

electric shock, or injury to a person

CAUTION: TO REDUCE THE RISK OF ELECTRIC

SHOCK, DO NOT REMOVE COVER (OR BACK).

NO USER SERVICEABLE PARTS INSIDE.

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 instructions for future reference and heed all warnings. Clean only with dry cloth. Packaging: Keep the box and packaging materials, in case the unit needs to be

returned for service. Warning: To reduce the risk or fire or electric shock, do not expose this apparatus to rain or

moisture. Do not use this apparatus near water! Warning: When using electric products, basic precautions should always be followed,

including the following:

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. An

apparatus with CLASS I construction shall be connected to a Mains socket outlet with a protective earthing ground. Where the MAINS plug or an appliance coupler is used

as the disconnect device, the disconnect device shall remain readily operable.

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. Only use

attachments/accessories specified by the manufacturer

Note: Prolonged use of headphones at a high volume may cause

health damage on your ears.

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.

Ensure that proper ventilation is provided around the appliance. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.

No naked flame sources, such as lighted candles, should be placed on the apparatus.

Power Cord

Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet. The AC supply cord should be routed so that it is unlikely that it will be damaged. Protect the power cord from being walked on or pinched particularly at plugs. If

the AC supply cord is damaged DO NOT OPERATE THE UNIT. To completely disconnect this apparatus from the AC Mains, disconnect the power supply cord plug from the AC

receptacle. The mains plug of the power supply cord shall remain readily operable.

Unplug this apparatus during lightning storms or when unused for long periods of time.

Service

The unit should be serviced only by qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.

safety-4v7 • May 7/2008

The exclamation point within an equilatereal triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance.

Le point d’exclamation à l’intérieur d’un triangle équilatéral

est prévu pour alerter l’utilisateur de la présence

d’instructions importantes dans la littérature accompagnant l’appareil en ce qui concerne l’opération et la

maintenance de cet appareil.

S2125A

Instructions relatives au risque de feu,

choc électrique, ou blessures aux personnes

AVIS: 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.

CONSULTEZ UN TECHNICIEN QUALIFIE

POUR L’ENTRETIENT

Veuillez Lire le Manuel: Il contient des informations qui devraient êtres comprises avant

l’opération de votre appareil. Conservez. Gardez S.V.P. ces instructions pour consultations ultérieures et observez tous les avertissements.

Nettoyez seulement avec le tissu sec.

Emballage: Conservez la boite au cas ou l’appareil devait être retourner pour réparation. Avertissement: Pour réduire le risque de feu ou la décharge électrique, n'exposez pas

cet appareil à la pluie ou à l'humidité. N’utilisez pas cet appareil près de l’eau! 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. Un appareil construit selon les normes de CLASS I devrait être raccordé à une prise murale d’alimentation avec connexion intacte de mise à la masse. Lorsqu’une prise de branchement ou un coupleur d'appareils est utilisée comme dispositif de débranchement, ce dispositif de débranchement devra demeurer pleinement fonctionnel avec raccordement à la masse.

Risque

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. Utilisez seulement

les attachements/accessoires indiqués par le fabricant

Note: L'utilisation prolongée des écouteurs à un volume élevé peut

avoir des conséquences néfastes sur la santé sur vos oreilles. .

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.

Assurez que lappareil est fourni de la propre ventilation. Ne procédez pas à

l’installation près de source de chaleur tels que radiateurs, registre de chaleur, fours ou autres appareils (incluant les amplificateurs) qui produisent de la chaleur.

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.

Cordon d’Alimentation

Ne pas enlever le dispositif de sécurité sur la prise polarisée ou la prise avec tige de

mise à la masse du cordon d’alimentation. Une prise polarisée dispose de deux lames dont une plus large que l’autre. Une prise avec tige de mise à la masse dispose de deux lames en plus d’une troisième tige qui connecte à la masse. La lame plus large ou la tige de mise à la masse est prévu pour votre sécurité. La prise murale est désuète si elle n’est pas conçue pour accepter ce type de prise avec dispositif de sécurité. Dans ce cas, contactez un électricien pour faire remplacer la prise murale. Évitez d’endommager le cordon d’alimentation. Protégez le cordon d’alimentation. Assurezvous qu’on ne marche pas dessus et qu’on ne le pince pas en particulier aux prises.

N’UTILISEZ PAS L’APPAREIL si le cordon d’alimentation est endommagé. Pour

débrancher complètement cet appareil de l’alimentation CA principale, déconnectez le cordon d’alimentation de la prise d’alimentation murale. Le cordon d’alimentation du bloc d’alimentation de l’appareil doit demeurer pleinement fonctionnel.

Débranchez cet appareil durant les orages ou si inutilisé pendant de longues périodes.

Service

Consultez un technicien qualifié pour l’entretien de votre appareil. L'entretien est nécessaire quand l'appareil a été endommagé de quelque façon que se soit. Par exemple si le cordon d’alimentation ou la prise du cordon sont endommagés, si il y a eu du liquide qui a été renversé à l’intérieur ou des objets sont tombés dans l'appareil, si l'appareil a été exposé à la pluie ou à l'humidité, si il ne fonctionne pas normalement, ou a été échappé.

AP4040 Parts List 3/17/2010

YS # Description Qty. YS # Description Qty. YS # Description Qty. YS # Description Qty.

5906 RED 3MM LED 1V9 20MA.4SPCER T&R 3 5896 4700U 80V 20%CAP BLK 25X50MM ELS 16 4986 1/4W 270R 5%MINI T&R RES 2 8869 8-18 X 1/2 THRD CUTTING FOR PLASTIC 4 5908 GRN 3MM LED 1V9 20MA.4SPCER T&R 3 4390 _10K AUD 16MM DETENT P22 2 4855 1/4W 330R 5% T&R RES 2 8999 8-32 X 5/8 PAN PH TAPTITE JS500 17 6419 BRIDGE 35A 400V WIRE LEAD GI3504 2 4520 _10K TRIM POT 2 4821 1/4W 470R 5% T&R RES 2 8719 8-32 X 3/4 FILLISTER PHIL MS JS500 2 6425 BAV21 200V 0A25 DIODE T&R 4 2448 15.00 AMP CIRCUIT BREAKER 1 4980 1/4W 470R 5%MINI T&R RES 9 8815 8-32 X 3/4 PAN PH TAPTITE JS500 5 6438 1N4007 1000V 1A0 DIODE T&R 15 3820 ___4UH COIL 14AWG ZOBEL HORIZONTAL 2 4891 1/4W 620R 5% T&R RES 2 8809 10-32 X 1/4 PAN PH TAPTITE JS500 5 6825 1N4148 75V 0A45 DIODE T&R 52 3485 CLIP 250X032 18-22AWG RIGHT ANGL 4 5019 1/4W 620R 5%MINI T&R RES 2 8749 10-32 X 1/2 QDX PH TAPTITE JS500 13 6934 MR854 400V 3A0 DIODE FASREC 20 3486 CLIP 250X032 22-18AWG DISCO-LOK 14 4873 1/4W 680R 5% T&R RES 1 8731 10-16 X 5/8 TYPE B HEX W/SLOT JS500 12 6429 1N4747A 20V0 1W0 ZENER 5% T&R 1 3489 CLIP 250X032 18-22AWG DISCO/INSL 3 4934 1/4W 1K 5% .2"U T&R RES 1 8740 5/16-18 X 3 GRD 5 HEX BOLT JS500 1 6432 1N5248B 18V0 0W5 ZENER 5% T&R 2 3490 CLIP 250X032 14-16AWG DISCO/INSL 4 4981 1/4W 1K 5%MINI T&R RES 15 3570 14 PIN SCKT CLOSED FRAME DIP ONLY 1 6433 1N5257B 33V0 0W5 ZENER 5% T&R 4 3601 RING TERMINAL 16AWG WIRE & #8 SCREW 2 4854 1/4W 1K2 5% T&R RES 1 8663 11/64 NYLON SPACER (MICRO PLASTIC) 66 6439 1N5225B 3V0 0W5 ZENER 5% T&R 2 3410 RED:LEFT/BLACK:RIGHT BIND POST TPP5 1 4988 1/4W 1K5 5%MINI T&R RES 6 8629 10-32 X 1/4 SPACER PHENOLIC 16 6440 1N750ARL 4V7 0W5 ZENER 5% T&R 9 3415 RED:RIGHT/BLACK:LEFT BIND POST TPP5 1 4791 1/4W 1K54 1% T&T RES 4 3751 SNAP IN 5/16 SPACER RICHCO 3 6450 1N5242B 12V0 0W5 ZENER 5% T&R 4 3918 1/4" JCK PCB MT HORZ SLIM W/SCREW 2 4808 1/4W 2K 5% T&R RES 4 3743 SNAP ON 0.5" SPACER RICHCO 5 6461 1N5240BRL 10V0 0W5 ZENER 5% T&R 1 3628 SPKON 4C PCB MT VERT 250TAB GRY #4 2 6113 1/4W 2K 5%MINI T&R RES 2 3851 1/2 PCB PLASTIC SPACER 4 6463 1N5251BRL 22V0 0W5 ZENER 5% T&R 1 3417 6-32 SCREW TERMINAL PC MNT SNAP-IN 1 4847 1/4W 2K2 5% T&R RES 2 3859 1/2 PLASTIC HEX SPACER #4 2 6465 1N5250B 20V0 0W5 ZENER 5% T&R 1 3657 XLR FEML PCB MT HORZ NO SHELL 2 6124 1/4W 3K 5%MINI T&R RES 6 8657 6-32 X 3/8" HEX SPACER ALUMINUM 2 6822 1N4745A 16V0 1W0 ZENER 5% T&R 4 3451 EYELET SMALL 0.089 OD PLATED 68 4826 1/4W 3K3 5% T&R RES 2 8921 #3MM ID3.2MM OD7.0MM THICK 5MM 4 6824 1N5246B 16V0 0W5 ZENER 5% T&R 2 9198 FAN 80MM X 80MM 40CFM 12VDC 1 6136 1/4W 3K3 5%MINI T&R RES 2 8667 SHOULDER WASHER SWS-229 LENGTH 1/8 4 5101 BC550C TO92 NPN TRAN T&R TB 14 7584 SQUARE-CUT O RING FOR AP AIR FILTER 1 4744 5.0W 3K6 5% BLK RES 8 3517 NYLON WASHER #8 0.062 4 5102 BC560C TO92 PNP TRAN T&R TB 14 8432 AP SERIES AIR GRILL BLACK PLASTIC 1 4681 1.0W 4K7 5% T&R RES 2 8818 3/4 OD X 3/8 ID X .080 THICK WASHER 2 5103 MPSA06 TO92 NPN TRAN T&R TA 3 8434 AP SERIES PLASTIC HANDLE PAIR 1 4943 1/4W 4K7 5% .2"U T&R RES 1 3511 #6 FLAT WASHER NYLON 2 5105 MPSA13 TO92 NPN DARL T&R TA 2 3894 AAVID 5972-B H/S W/TAB B.O. 8 4982 1/4W 4K7 5%MINI T&R RES 17 8485 #6 SPLIT WASHER ZINC 4 5106 MPSA63 TO92 PNP DARL T&R TA 1 3501 B52200F006 COMP WASH #4 SMALL 23 4887 1/4W 7K5 5% T&R RES 5 8850 #10 INT TOOTH LOCKWASHER BO 4 5108 2N5401 TO92 PNP TRAN T&R TA 2 3803 NYLON SECUR-A-TACH MINI PLASTIC TIE 1 4990 1/4W 8K2 5%MINI T&R RES 2 3502 NYLON FLAT WASHER OD.158ID.110H.070 2 5113 MPSA42 TO92 NPN TRAN T&R TA 2 3810 4" NYLON CABLE TIE 12 4762 1/4W 9K760 0.1% *** T&R RES 8 3436 DPDT PUSH SW PCMT H BREAK B4 MAKE 3 5114 MPSA92 TO92 PNP TRAN T&R TA 2 3827 SQUARE BUMPER BUTTON BLACK 11 4800 1/4W 10K0 1% T&R RES 2 3587 DPDT ROKR SW QUIK 250"AC/PWR ON-OFF 1 6854 2N6517 TO92 NPN TRAN TA 3 3852 STICK ON CABLE WRAP ANCHOR 1 4829 1/4W 10K 5% T&R RES 2 3705 4P3T SLID SW PCMT H 1 6752 MTP10N15L TO220 NCH MFET TN 2 2328 8 CIR XH-HEADER 0.098IN 4 4983 1/4W 10K 5%MINI T&R RES 9 3682 250 MALE PCB TAB REEL 36 6814 MJF6668 T221D PNP TRAN DARL TJ 1 2329 12 CIR XH-HEADER 0.098IN 2 6116 1/4W 10K0 1%MINI MF T&R RES 12 3035 PATCH 08 22AWG 05.0 XH 1 6815 MJF6388 T221D NPN TRAN DARL TJ 2 4056 2 CIR XH-HEADER 0.098IN 1 4856 1/4W 12K 5% T&R RES 4 3036 PATCH 08 22AWG 09.0 XH 1 6873 MJE340 TO126 NPN TRAN TG 6 8433 KNOB AP SERIES PLASTIC 2 5008 1/4W 14K7 1% T&R RES 2 3037 PATCH 12 22AWG 15.0 XH 1 6874 MJE350 TO126 PNP TRAN TG 6 8661 KNOB BUTTON FLAT GREY 3 4630 1/2W 15K 5% T&R RES 2 CH1197 AP4040 117VAC-IMPORT T'RD 1 6925 MTP8P20 TO220 PCH MFET TN 2 8437 FAN FILTER LABEL 1 4830 1/4W 15K 5% T&R RES 12 8379 1/4 X 6 X 2.3 10PP1 FILTER FOAM 1 6909 MJ21196 TO3 NPN TRAN TH 16 3468 8' 3/16 SJT AC LINE CORD STRIP 17" 1 4771 1/4W 17K8 1% T&R RES 2 6910 MJ21195 TO3 PNP TRANSISTOR TH 16 3821 STRAIN RELIEF HEYCO #1200 1 6125 1/4W 18K 5%MINI T&R RES 2 7004 2SA2121-0 TO3P PNP TRAN TK 2 8261 GE VELVET/MATTE LEXAN .007"X12"X24" 0.348 6123 1/4W 20K0 1%MINI MF T&R RES 4 7005 2SC5949-0 TO3 NPN TRANSISTOR TK 2 8701 4-40 KEPS NUT ZINC 20 4777 1/4W 21K5 1% T&R RES 2 6745 LM13600N IC XCONDUCTANCE AMP 2 8793 4-40 HEX NUT ZINC 3 4632 1/2W 22K 5% T&R RES 8 6840 MC33078P IC DUAL OP AMP 5 8760 6-32 KEPS NUT TIN PLATED 64 6118 1/4W 22K 5%MINI T&R RES 1 5190 MBS4992 TO92 8V5 DIAC T&R 2 8800 6-32 KEPS NUT ZINC 5 4833 1/4W 27K 5% T&R RES 6 6478 AS35FN-TO92 TEMPERATURE SENSOR 2 8854 6-32 X 1/4" 0.D. HEX NUT ZINC CLEAR 4 4840 1/4W 33K 5% T&R RES 3 6489 __5R 20% THERMISTOR-SURGR NTC 2 8720 #8 SPRING NUT 2 6122 1/4W 33K 5%MINI T&R RES 1 6517 STM-BTB-600BRG TO220 ??A TRIAC 600V 2 8797 5/16-18 KEPS NUT JS500 1 4878 1/4W 43K 5% T&R RES 2 6880 4N35 OPTO-COUPLER 4 3797 TO-247 THERMO CONDUCTIVE PAD 4 6119 1/4W 47K 5%MINI T&R RES 9 5401 _10P 500V 5%CAP T&R RAD CER.2NPO 4 3846 TO220 THERMO PAD LARGE HOLE 56359B 8 4835 1/4W 56K 5% T&R RES 8 5197 220P 100V 2%CAP T&R RAD CER.2NPO 3 3916 TO3 SIL-PAD REPLACES MICA 32 6139 1/4W 62K 5%MINI T&R RES 2 5203 _47P 100V 2%CAP T&R RAD CER.2NPO 2 4060 SILPAD 1500ST 0.900 X 0.725BERQUIST 4 5007 1/4W 78K7 1% T&R RES 2 5410 100P 100V 10%CAP T&R BEAD NPO 2 8432P LOGO HOT STAMPED ON PLASTIC GRILL 1 4586 1/4W 82K 5%MINI T&R RES 2 5412 220P 100V 10%CAP T&R BEAD NPO 13 4597 22AWG STRAN TC WIR JMP 23 4898 1/4W 91K 5% T&R RES 4 5201 470P 100V 5%CAP T&R RAD CER.2NPO 2 4599 22AWG SOLID SC WIR T&R JMP 120 4838 1/4W 100K 5% T&R RES 2 5208 __2N2 400V 5%CAP T&R RAD .2FLM 12 5299 24AWG SOLID SC WIR RAD JMP 10 6120 1/4W 100K 5%MINI T&R RES 2 5273 __1N5 200V 5%CAP T&R RAD CER.2NPO 2 4745 5.0W 0R1 5% BLK RES 12 4851 1/4W 120K 5% T&R RES 2 5416 470P 50V 10%CAP T&R BEAD NPO 2 4749 5.0W 0R15 5% BLK RES 4 4886 1/4W 200K 5% T&R RES 1 5422 __1N 50V 10%CAP T&R BEAD NPO 2 2005 1.0W 0R47 5%FLAME PROOF T&R RES 2 4668 2.0W 220K 5%10MM BODY T&R RES 2 5209 __4N7 250V 5%CAP T&R RAD .2FLM 2 2006 1.0W 1R 5%FLAME PROOF T&R RES 4 6126 1/4W 220K 5%MINI T&R RES 10 5210 _22N 100V 10%CAP T&R RAD .2FLM 11 4677 1/2W 1R 5% T&R RES 4 6127 1/4W 470K 5%MINI T&R RES 2 5834 _10N 250V 20%CAP BLK RAD POLY FLM 2 4688 1/2W 2R2 5% T&R RES 3 4844 1/4W 1M 5% T&R RES 1 6435 _22N 275V 20%CAP BLK 'X2' 15MM AC 2 4911 1/4W 2R2 5% T&R RES 8 4948 1/4W 1M 5% .2"U T&R RES 1 6451 __4N7 250V 20%CAP BLK 'Y' 10MM AC 1 4748 2.0W 3R9 5% T&R 4 4951 1/4W 4M7 5% .2"U T&R RES 2 5212 100N 63V 5%CAP T&R RAD .2FLM 4 4733 5.0W 5R6 5% BLK RES 2 6132 1/4W 8M2 5%MINI T&R RES 2 5226 _68N 100V 5%CAP T&R RAD .2FLM 4 2009 1/4W 10R 2%FLAME PROOF T&R RES 2 4751 1/4W 22M 5% T&R RES 4 5228 100N 100V 5%CAP T&R RAD .2FLM 3 2037 1/4W 10R FUSIBLE T&R RES 6 3618 STAR RING TERMINAL14-16AWG #10SCREW 4 5229 150N 63V 10%CAP T&R RAD .2FLM 4 4605 1/8W 10R 5% T&R RES 1 3604 21" 14C-28AWG DIP HDR CABLE .05" 1 5231 220N 63V 10%CAP T&R RAD .2FLM 2 4875 1/4W 10R 5% T&R RES 2 3699 RELAY 1C 02AMP DC48 006MA PC-S 1 5234 470N 63V 10%CAP T&R RAD .2FLM 4 4930 1/4W 10R 5% .2"U T&R RES 1 3735 RELAY 1A 16AMP DC48 011MA PC-C 1 5314 100N 50V 10%CAP T&R BEAD X7R 2 2039 1/4W 22R0 FUSIBLE T&R RES 2 8870 #4 X 1/4 PAN PH TYPE A ZINC 2 5882 220N 250VDC 10%CAP BLK RAD PLY FLM 4 2014 1/8W 33R 2%FLAME PROOF T&R RES 4 8865 4-40 X 5/16 PAN PH MS JS500 2 5255 __1U 63V 20%CAP T&R RAD .2EL 3 2016 1/8W 39R 2%FLAME PROOF T&R RES 2 8729 #4 X 3/8 FLAT QUAD TYPE A JS500 BLK 4 5258 __4U7 63V 20%CAP T&R 8X7MM .2EL 2 2041 1/4W 39R0 FUSIBLE T&R RES 10 8742 4-40 X 3/8 PAN PH TAPTITE JS500 2 5259 __4U7 63V 20%CAP T&R RAD .2 4 4899 1/4W 39R 5% T&R RES 6 8861 4-40 X 3/8 PAN PH MS JS500 8 5269 __4U7 100V 20%CAP T&R RAD LESR2 2 2042 1/4W 47R0 FUSIBLE T&R RES 4 8741 4-40 X 1/2 PAN PH MS JS500 3 5260 _22U 50V 20%CAP T&R RAD .2EL 8 4811 1/4W 68R 5% T&R RES 2 8871 4-40 X 5/8 PAN PH MS JS500 12 5282 _10U 16V 20%CAP T&R 5X7MM .2NP 2 4984 1/4W 150R 5%MINI T&R RES 4 8902 4-40 X 3/4 PAN PHIL MS B/O & WAX 4 5629 _10U 160V 20%CAP BLK 10X13MM EL 4 2045 1/4W 150R FUSIBLE T&R RES 8 8799 #6 X 1/4 PAN PH TYPE B JS500 2 5945 _10U 63V 20%CAP T&R RAD .2EL 2 2021 1/4W 200R0 1%FLAME PROOF T&R RES 6 8832 6-32 X 1/4 PAN PH TAPTITE JS500 4 5961 _33U 16V 20%CAP T&R RAD .2 12 2023 1/8W 220R0 1%FLAME PROOF T&R RES 4 8801 6-32 X 3/8 PAN PH TAPTITE JS500 4 5267 100U 25V 20%CAP T&R RAD .2EL 3 4857 1/4W 220R 5% T&R RES 2 8829 6-32 X 3/8 FLAT PH TAPTITE BO#C HEA 24 5619 330U 100V 20%CAP BLK 12X25MM EL 4 4977 1/4W 220R 5%MINI T&R RES 7 8761 6-32 X 1/2 PAN PHIL MS ZINC CLEAR 64 5621 470U 63V 20%CAP BLK 12X25MM EL 1 2024 1/8W 249R 2%FLAME PROOF T&R RES 12 8796 6-32 X 5/8 PAN PH TAPTITE ZINC 2 5630 330U 25V 20%CAP BLK 10X13MM EL 6 4867 1/4W 270R 5% T&R RES 2 8830 6-32 X 7/8 PAN PH MS JS500 2

550 Granite Court, Pickering, Ontartio CANADA L1W-3Y8

4625 Witmer Industrial Estate, Niagara Falls, New Yor k USA 14305

SERVICE MANUAL

Yorkville Sound • http://www.yorkville.com

550 Granite Court, Pickering, Ontartio CANADA L1W-3Y8

4625 Witmer Industrial Estate, Niagara Falls, New Yor k USA 14305

SERVICE MANUAL

Yorkville Sound • http://www.yorkville.com

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MM11112299 ““TTHHEE IINNPPUUTT BBOOAARRDD””

The input board processes the audio signal from the input jacks to the volume control board, (M1128).

Each channel consists of a balanced gain stage, switchable subsonic filter, and a

stereo / mono / bridge switch.

Looking at the left channel, the balanced input, (XLR Jack) and unbalanced input (phone jack) are wired in parallel to the input of a balanced operational amplifier, (U4). The gain of this stage is 0.82 (-1.3dB) balanced and 1.6 (4.0dB) unbalanced. Resistors R25, R27 along with capacitors C11 and C12 form a radio interference elimination filter.

Switch S1 selects the cutoff frequency of the hi-pass subsonic filter.The subsonic filter provides a 20Hz or 40 Hz high pass filter.The filter consists of a tee network on the input of U3 along with R10, R28, C29 and C30, C33 and C34.The gain is 1 (0dB) in the passband, (above 100Hz).

The audio signals from the input board M1129 pass through the 14 conductor cable to board M1128.

MM11112288 ““VVOOLLUUMMEE CCOONNTTRROOLL BBOOAARRDD””

This board contains:

• the front panel audio gain controls

• the front panel indicating LED’s (power, protect, activity and clip).

• the audio limiters

Circuit Explanation:

• The left channel of the circuit is explained. (Refer to the schematic of M1128 as the sections of the circuit are explained.)

The audio signal out of M1129 passes through volume control P2 and the desired level enters U2 through pin 6.U2 is set for a gain of 5 (14dB) when the volume control is in the fully clockwise position.

The AP4040’s defeatable limiter is built around LD8. LD8 is an opto-resistive cell comprising of an LED that shines on a photocell. As the LED in the LD8 becomes brighter, the resistance of the photocell decreases, placing more of the audio signal on pin 5 (non-inverting input) of U2.This audio voltage gets subtracted from the signal on the inverting input and less signal appears on the output of U2.Transistors Q5 and Q6 along with the surrounding passive parts provide the attack and release time constants of the limiting function along with the drive currents for the clip LED and the LED inside LD8.When an audio signal on the output of the power amplifier section (on board M1146) enters clipping, pulses representing the duration of the clipped portion appear at LCLIP.These pulses turn on transistor Q6, and Q6 provides current pulses to turn on clip LED LD6. The pulses also pass through R7 and D6 to charge C3 and C36.When the voltage across C3 reaches 0.5 volts then Q5 turns on providing a current into the LED of the LD8 limiting the audio signal at U2.The charging (attack) and discharging (release) times of the limiter are 80mS and 3.5 seconds respectively. Resistors R50 and R7 provide the charging path, and resistor R51 provides the discharge path.The limiter can be defeated by placing the limiter switch (S2) in the in position which disconnects Q5 and the charging / discharging circuitry from V+.

The activity LED circuit consists of Q1 and the surrounding circuitry.The audio signal enters the activity LED circuit through R2. R2 and C21 form a differentiator that turns Q1 on illuminating the activity LED whenever the audio signal increases in amplitude. A constant current flows through R55A, R55B and when Q1 is off, the collector current then flows through D1.

From M1128 the audio signal passes through a 12-conductor ribbon cable to circuit board M1147.

On M1127 an operational amplifier U201 re-references the ground for the audio signal from LREF or RREF to the corresponding LOG (left output ground) or ROG (right output ground). U201 also provides DC correction for DC offsets appearing on the output binding posts. Feedback from the output binding posts appears on LFNB or RFNB. Through R203A or R203B the DC offset achieves a gain of -1 from U201.The DC offset of opposite polarity on the output of U201 will compensate for the DC offset in the amplifier section on M1146 resulting in 0 volts DC on the output binding posts.

• The audio signal continues to M1146 via an 8-conductor ribbon cable.

MM11112266 ““TTHHEE VVOOLLTTAAGGEE AAMMPPLLIIFFIIEERR AANNDD CCUURRRREENNTT AAMMPPLLIIFFIIEERR””

This board contains:

• a voltage amplifier section

• a current amplifier section

• amplifier current limit section

• DC output protection

• heatsink temperature sensing

Voltage Amplifier Section

The voltage amplifier amplifies the audio signal’s voltage from 6.8 volts peak (at the output of U201) to approximately 98v peak, which is required to drive the current amplifier section.The current amplifier provides the current required for the 98v peak signal to drive 1200 watts into 4 ohms out of the binding posts.

Before the circuit is described in detail here is a quick rundown on the signal’s path through the voltage amplifier stage.Refer to the schematic of M1146. Let’s consider that a positive going AC signal is present at the SIG input.The positive going signal will turn on the positive side of the voltage amplifier.The signal at the SIG input turns on Q12A (through R40A, D14A and D13A).The collector of Q12A pulls down on the base of Q14A turns this transistor on further and allows a greater current to flow out of Q14A’s collector. This increase in current passes through Q15A and it’s collector to emitter voltage decreases.The collector of Q15A now being more positive in voltage turns the base of Q18A on causing an increase in Q18A’s collector current resulting in test point 1 going positive.

As the positive side of the amplifier was turning on the negative side would have been turning off.This is how test point 1 was able to move positive following the input signal.The reverse would hold true if a negative going signal were present on the input of the voltage amplifier.

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CIRCUIT DESCRIPTION:

The voltage amplifier is a mirrored image with circuitry connected to the positive power supply rail being identical (but opposite polarity) to the circuitry connected to the negative power supply rail.

For this reason we will look in detail at the positive side of the amplifier.

The audio signal enters the voltage amplifier at the SIG input.The signal passes through R40A, D14A and D13A to the base of Q12A. Diodes D13A and D14A set up the DC bias on Q12A to approximately 0.6 mA.

The first voltage gain stage consists of Q12A along with the resistor chain on its collector and the emitter resistor (R44A).

Transistor Q12A drives the base of Q14A through the resistor chain. A DC current of approximately 4 mA should flow through the collector of Q14A.The voltage drop across Q14A remains constant and is derived from the voltage drop across the voltage reference Q20A, resistor R58A, and the base/emitter junction of Q15A.This total voltage should equal approximately 3 VDC. Transistor Q14A is the second gain stage and its output current flows through Q15A. Transistor Q15A is a common base stage with the collector driving the base of output buffer Q18A.

Diode D17A is a clamping diode that prevents the maximum peak of the audio signal from coming within 4V of the 144 VDC rail.This is to prevent the output current amplifier from going into saturation during clipping and therefore having storage delay problems.

Transistor Q18A buffers the high impedance present on the collector of Q15A.The output of the buffer provides a low output impedance at the junction of R61A and R62A and is current limited to 30mA through the clamping action of D19A, D20A and D23A. The signal at the junction of R61A and R62A drives the succeeding current amplifier.

Current Amplifier Section

The current amplifier receives a high voltage audio signal from the voltage amplifier and provides the current drive necessary to drive speaker cabinets.

The current amplifier is a two-tier complimentary output driver design controlled by a complimentary darlington stage.

[CIRCUIT DESCRIPTION - REFER TO THE SIMPLIFIED SCHEMATIC #1 ON THE

FOLLOWING PAGE]

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QUIESCENT CONDITION:

This design is class A/B and therefore the output driver transistors must be forward biased to provide low crossover distortion. In most class A/B designs, a diode chain or VBE multiplier is used to control the bias voltage and provide a means of adjusting the bias.This design is different, as there isn’t a diode chain or VBE multiplier. For simplicity lets consider only the positive side of the current amplifier, that is all parts between the positive power supply rails and the audio signal output/input terminals.The negative side is the same as the positive, except for polarity changes.

To bias Q14, greater than 0.5V is needed from base to emitter, (or for simplicity from base to amplifier output). Points A and B are at the same potential, so consider them to be connected. If this is true then 0.5V from test point 2 to the amplifier output must appear across R12.There must be some way of developing this voltage across R12, and there is using the darington (Q5 and Q40) driver along with local feedback.

Simplified schematic #1 shows the biasing circuit.The current needed to develop 0.5V across R12 comes from the emitter of Q5.When the amplifier is first turned on the current source (Q3) turns on Q5 and Q40) and current flows through R12 developing a voltage. When this voltage approaches 0.5V Q1 turns on and robs current from the base of Q40.

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4625 Witmer Industrial Estate, Niagara Falls, New Yor k USA 14305

SERVICE MANUAL

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This causes Q40 to turn off until the reduced current flowing through Q5 maintains

0.5V across R12. Q1 will tur n off slightly causing Q5 and Q40 to increase their collector currents.The circuit reaches a point of equilibrium with approximately 0.5V across R12.

Because all output devices are not identical and base emitter voltages var y, some adjustment must be available to slightly adjust the 0.5V across R12.This is accomplished with RT1. RT1 causes Q1 to turn on slightly more or less resulting in Q5 and Q40 turning on slightly more or less and therefore R12’ s voltage will be slightly more or less than 0.5v. The proper quiescent current voltage is 4mV (to be measured between test points 8 and 9).

The Second Tier and Tier Switching

Refer to the simplified schematic Fig. #1 while reading the following text.One way of making an amplifier more efficient is to vary the Power Supply Voltage on the collectors of the output transistors (Q14 & Q22).The lower the voltage from collector to emitter, the lower the device dissipation.During quiescent conditions, there is 55VDC on the collectors of output transistors Q14 and Q22.The peak AC voltage that can appear on the amplifier’s output is approximately 139V peak. How can an output transistor deliver a 139V peak when its collector is only at 78VDC? It can if its collector is pulled up to 144VDC as the output signal’s peak rises above 78VDC.Refer to Fig. #2. The second tier voltage must remain above the amplifier’s output voltage by amount Vm. Therefore the circuitry controlling the second tier voltage must increase the tier voltage before the amplifier’s output voltage reaches 78VDC.This leading voltage is necessary to compensate for time lag of the second tier circuit during fast rising amplifier output

signals.

The voltage between the amplifier’s output and test point 4 is approximately 12VDC derived from the voltage drop across ZD4.We call this voltage the “floating battery” because it floats on top of the output audio signal with test point 4 always being 12VDC greater than the peak of the output signal.Test point 4 drives the gate of mos-fet Q11. Q11 controls the transistors of the upper tier.As Q11 turns on its source forward biases the base of Q13 and Q13 pulls the collector of Q14 towards the 100 volt rail. The gate to source voltage needed to turn on Q11 is approximately 3.5 volts.When the peak output signal is about 69.5vp (78v-(12v-3.5v)) then Q11 will start to turn on the second tier. The second tier voltage will remain about 13 volts (Vm) above the peak of the output signal

to the point of clipping where this voltage is reduced to about 6 volts (measured driving an 8 ohm load). Zener ZD8 protects the gate source junction of Q11 and also provides a supply current path through R29 for the “floating battery”.

NOTE: The Power supply voltages given are those when the amplifier is not driving a

speaker load.This will allow yo to check the tier switching with the cover of the amplifier off and the amplifier, therefore, running cool.

Current Limit Protection Circuitry

To have an amplifier drive 3000 watts into practically any combination of speaker cabinets and know what is a safe load and what is not is a very difficult task. An extensive

amount of time was spent on the current limit circuitry so that it may simulate the safe operating area of the output transistors (SOAR curve).No matter how reactive the load may be the phase shift that it presents, along with it’s resistive component is used to set the output current limit of the output transistor stage.

Refer to the schematic of board M1146 while reading the following text. The current limit circuitry is a mirrored image with circuitry connected to the positive power supply rail being identical (but opposite polarity) to the circuitry connected to the negative power supply rail.For this reason we will look at the positive side of the circuitry.

Transistor Q9 measures the peak current flowing through resistor R53. The voltage across R53 (as a result of the current flowing through it) is scaled down by R55, R35, R35A, R36, R37, D7 and D11 these parts make up the safe operating area along with the time constants of C30, R34, C12 and R26. Fig. #3 shows a waveform of the current that passes through R52 and R53 when the output of the amplifier is shor ted to ground. This can only be seen by using an oscilloscope to measure differentially across R52 and R53.The conditions of the measurement are contained on the diagram. During current limit when Q9 turns on it reduces the voltage across R42. R42 is in ser ies with a 16 volt zener (ZD7) and is also in parallel with the junction of Q8.The current that flows through R20, ZD7, R42, and R22 normally saturates Q8. When Q9 reduces the voltage across ZD9 and R42 to below 16.6 volts, Q8 turns off allowing a charge to build up on C8 through resistors R24 and R25. If current limiting occurs for a long enough duration to allow C8 to charge to 1.2 volts then Q7 will turn on tripping the relay circuit on board M1147. As soon as the relay is tripped the audio signal will be tur ned off at the output of the voltage amplifiers and will remain off for about 5 seconds before the relay turns on and allows the audio signal to pass through the amplifier.If a current limit condition is still present then the whole cycle will occur again and repeat until the load conditions on the amplifier’s output are safe for the amplifier.When a safe load appears the amplifier will automatically reset and drive that load (the speaker cabinet).

DC Protection

If a DC voltage greater than 8 volts appears on the output of the amplifier for more than 200 milliseconds then triac Q30 will turn on holding the output at ground potential. MBS4992 is a device that turns on at either + or - 8 volts DC.

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NOTE: Every time you replace blown output transistors on a

M1146 board test the DC protection triac with the following circuit.

Conditions of test:

A) Pass a 100Hz 25v peak signal through the M1126 board under test with no load connected to the amplifier output.

B) Connect points 1 and 2 as shown in the diagram.The amplifier should go into protect mode as the triac (if working) shorted the output of the amplifier to ground, and the amplifier goes into current limit.

C) Disconnect the triac test circuit and allow the amplifier to complete it’s protect cycle. D) Reverse connections 1 to 2 and 2 to 1 and test again.The same results as in B)

should be observed if the triac is working.

Only test the triac for one protect cycle as

prolonged testing will heat the triac to a high temperature.

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• The shutdown relay and its associated drive circuitry have two possible operating states.

• Amplifier on under normal operating conditions.

• Amplifier power switch has just been turned OFF/ON, or the amplifier is in current limit protecting the amplifier’s output transistors, or the amplifier has overheated.

Shutdown Circuit

Here is how the circuit accomplishes these functions.The relay’s normally closed contacts short the output of the voltage amplifiers to ground when the power switch is off. When the power switch is turned on, the relay remains off (normally closed) for about 6 seconds. C203 charges to 35V and results in Q203 turning off allowing Q201 to turn on. As Q201 turns on, it connects the negative terminal of the relay’s coil (Pin 16) to ground energizing the relay and opening the normally closed contacts.

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If prolonged current limiting occurs on the amplifier’s output transistors then D204 or D205 (depending on which channel is current limiting) will be forward biased turning on Q202 (from its off state). Now +144VDC appears on the collector of Q202 and through R210 and R211 turn on Q203 therefore turning off Q201 by shorting its base emitter junction. Q201 tur ning off will tur n the relay off and the normally closed contacts (off state) will short the outputs of the voltage amplifiers to ground so as not to continuously stress the amplifier’s output transistors.A cycle now occurs.With the voltage amplifiers now disabled there is no signal driving the output transistors (Q13 to Q28).

The current limit circuit protecting the output transistors (Q13 to Q28) turns off and D204 and/or D205 are not forward biased and Q202 turns off.Through Q203 and Q201 the relay is turned back on and the voltage amplifiers are now active again, driving the output transistors. If current limiting still occurs, then the same cycle will occur. If the cause of current limiting (low impedance or short on the speaker output terminals) has been removed, then the amplifier will continue to operate normally.

The third operation that the relay provides is “overheat shutdown”. If for some reason the fan cannot keep the heatsinks in a safe operating temperature area then the fan control circuit (on board M1147) will deliver through D207 a positive current to tur n Q203 on and turn Q201 off to turn off the relay and disable the voltage amplifiers. When the fan has cooled down the temperature of the amplifier, then the signal through D207 will disappear and the relay circuit will turn on the relay to resume normal operation. Anytime the relay is in the “protect” mode (due to the abnormal states) then contact pin 4 of the relay will illuminate LD3 (the protect LED on the front panel).

Soft Turn On Circuit

To reduce the “inrush” current that flows through the line cord from the 120 VAC power source (typical with large linear power supplies), a circuit provides a soft turn on function.When the power switch is turned on, the current that initially flows through the primary of the transformer must flow through SG201 and SG202.These are surgestors that reduce the peak inrush current flow.After about 500 milliseconds a relay’s contacts short across the surgestors so that they are not stressed by the current flowing through them under normal operation. A circuit consisting of Q240, Q241, C215, and the associated resistors provides the time delay for the turn on cycle of the relay. The circuit is very similar to the shutdown time delay circuit.Refer to the section on the shutdown circuit for a circuit description.

Fan Circuit

Looking at the schematic to board M1147, here is a quick explanation of the fan control circuit. There is a temperature sensor (AS35) on each M1146 board.When the amplifier is first turned on, Q207 and Q208 are off.The AS35 temperature sensors are configured as temperature controlled current sources. As either temperature sensor begins to heat up, more current flows through D212 or D218 increasing the voltage drop across R235 or R236. The hotter temperature sensor will provide more current than the cooler sensor and therefore develop a higher voltage across it’s associated 8K2 resistor.The higher voltage will forward bias D212 or D218 reverse biasing the cooler temperature

sensor’s diode so that the hotter sensor will control the fan speed. At 40 degrees C there

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is 10 volts across R235 or R236 which is enough to turn on Q210, Q208, and Q207 pro-

is 10 volts across R235 or R236 which is enough to turn on Q210, Q208, and Q207 providing 7 DC volts to the fan. Further heating the temperature sensors results in a larger

viding 7 DC volts to the fan. Further heating the temperature sensors results in a larger

viding 7 DC volts to the fan. Further heating the temperature sensors results in a larger DC voltage across the fan. To lower the dissipation of Q207, D215, D216, ZD205, ZD206

DC voltage across the fan. To lower the dissipation of Q207, D215, D216, ZD205, ZD206

DC voltage across the fan. To lower the dissipation of Q207, D215, D216, ZD205, ZD206 and R226 turn off Q207 and Q208 when the full wave rectified voltage present of the col-

and R226 turn off Q207 and Q208 when the full wave rectified voltage present of the col-

and R226 turn off Q207 and Q208 when the full wave rectified voltage present of the collector of Q207 reaches approximately 58V by robbing current from the base of Q208.

lector of Q207 reaches approximately 58V by robbing current from the base of Q208.

lector of Q207 reaches approximately 58V by robbing current from the base of Q208. The maximum fan voltage is 20.5 VDC. ZD207 and R228, R229 and R230 provide a cur-

The maximum fan voltage is 20.5 VDC. ZD207 and R228, R229 and R230 provide a cur-

The maximum fan voltage is 20.5 VDC. ZD207 and R228, R229 and R230 provide a current limiting function. Figure #4 shows the current through these resistors when there is

rent limiting function. Figure #4 shows the current through these resistors when there is

rent limiting function. Figure #4 shows the current through these resistors when there is 12VDC across the fan.

12VDC across the fan.

Thermal Shutdown Circuit

The emitter of Q210 in the fan circuit is the measuring point for the shutdown voltage.

The emitter of Q210 in the fan circuit is the measuring point for the shutdown voltage. As the temperature sensing devices (AS35) that control the fan circuit heat up the volt-

As the temperature sensing devices (AS35) that control the fan circuit heat up the volt-

As the temperature sensing devices (AS35) that control the fan circuit heat up the voltage on the emitter of Q210 rises until at 85 degrees Celsius on the M1146 heatsinks.

age on the emitter of Q210 rises until at 85 degrees Celsius on the M1146 heatsinks.

age on the emitter of Q210 rises until at 85 degrees Celsius on the M1146 heatsinks. The voltage on the emitter of Q210 reaches 18 (85 degrees C) VDC and the amplifier

The voltage on the emitter of Q210 reaches 18 (85 degrees C) VDC and the amplifier

The voltage on the emitter of Q210 reaches 18 (85 degrees C) VDC and the amplifier must be shutdown to protect the output power transistors. ZD202 and D207 become

must be shutdown to protect the output power transistors. ZD202 and D207 become

must be shutdown to protect the output power transistors. ZD202 and D207 become forward biased and Q203 turns on turning the relay off and muting the audio signal.

forward biased and Q203 turns on turning the relay off and muting the audio signal.

forward biased and Q203 turns on turning the relay off and muting the audio signal. After the amplifier cools down the voltage will decrease until Q37 turns off turning the

After the amplifier cools down the voltage will decrease until Q37 turns off turning the

After the amplifier cools down the voltage will decrease until Q37 turns off turning the relay back on enabling the amplifier.

relay back on enabling the amplifier.

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STEP 1:VISUAL INSPECTION OF FRONT PANEL AND FAN

• Check to see whether the green power LED is lit. If not, the amplifier has a

• Check to see whether the green power LED is lit. If not, the amplifier has a power supply (M1147 board), transformer, A.C. switch or line cord problem.

power supply (M1147 board), transformer, A.C. switch or line cord problem.

• If the red protect LED stays on or samples off and on, this usually indicates a

• If the red protect LED stays on or samples off and on, this usually indicates a problem with the voltage amplifier or current amplifier sections on one or both of

problem with the voltage amplifier or current amplifier sections on one or both of

problem with the voltage amplifier or current amplifier sections on one or both of the M1126 boards. Check for misaligned pin connections or see if the ribbon

the M1126 boards. Check for misaligned pin connections or see if the ribbon

the M1126 boards. Check for misaligned pin connections or see if the ribbon cables have been cut or pinched through their insulation.

cables have been cut or pinched through their insulation.

• If the fan is running at full speed at power up this usually indicates a problem

• If the fan is running at full speed at power up this usually indicates a problem with the fan circuitry on the M1147 board, but it can also be caused by M1146 cir-

with the fan circuitry on the M1147 board, but it can also be caused by M1146 cir-

with the fan circuitry on the M1147 board, but it can also be caused by M1146 circuit problems. A damaged AS35 temperature sensor located under the M1146

cuit problems. A damaged AS35 temperature sensor located under the M1146

cuit problems. A damaged AS35 temperature sensor located under the M1146 heatsinks can cause erratic fan behavior.

heatsinks can cause erratic fan behavior.

• No output on either or both channels could be caused by intermittent push

• No output on either or both channels could be caused by intermittent push switches on the input board.

switches on the input board.

STEP 2:VISUAL INSPECTION OF INTERNAL CHASSIS AND INITIAL TESTING

After removing the lid, look for any signs of smoke, charring or burnt components.

After removing the lid, look for any signs of smoke, charring or burnt components. Before powering up replace the burnt components, and check the associated circuitry

Before powering up replace the burnt components, and check the associated circuitry

Before powering up replace the burnt components, and check the associated circuitry for damaged parts. Disconnect one M1127 board and test one board at a time to

for damaged parts. Disconnect one M1127 board and test one board at a time to

for damaged parts. Disconnect one M1127 board and test one board at a time to reduce the possibility of further damage. Use a variac to slowly increase the 120 VAC

reduce the possibility of further damage. Use a variac to slowly increase the 120 VAC

reduce the possibility of further damage. Use a variac to slowly increase the 120 VAC up from 0 volts while monitoring the quiescent current with a meter and the speaker

up from 0 volts while monitoring the quiescent current with a meter and the speaker

up from 0 volts while monitoring the quiescent current with a meter and the speaker output with an oscilloscope. Watch the speaker output for large DC offsets, or oscilla-

output with an oscilloscope. Watch the speaker output for large DC offsets, or oscilla-

output with an oscilloscope. Watch the speaker output for large DC offsets, or oscillation. Watch the meter for large collector currents flowing. Remember under quiescent

tion. Watch the meter for large collector currents flowing. Remember under quiescent

tion. Watch the meter for large collector currents flowing. Remember under quiescent conditions, there should only be 3 to 5 millivolts across test points 8 and 9 on the out-

conditions, there should only be 3 to 5 millivolts across test points 8 and 9 on the out-

conditions, there should only be 3 to 5 millivolts across test points 8 and 9 on the output stage of the amplifier.

put stage of the amplifier.

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SPECIFICATIONS

Frequency Response: +/- 1dB, 20 Hz to 20 KHz

Hum and Noise: -103 dB below max output RMS voltage, unweighted

THD (1 khz, 4–Ohms): <0.01%

THD(20Hz – 20kHz, 4–Ohms): <0.1%

High Pass Filter: 40Hz, 12 dB/octave

Slew Rate: Power amp section: 25 V/uS, 50 V/uS in bridged mode

Damping Factor: > 600, 20 Hz - 20 KHz, into 8 ohms

Crosstalk: -75 dB below full output at 1khz, -60 dB below full output

(20 Hz - 20 KHz)

Input Impedance: 20 KOhms balanced, 10 KOhms unbalanced

Input Sensitivity: 1.4 VRMS sine wave

(AP4020: 36 dB, AP4040: 39 dB gain)

Rejection: CMRR@60Hz: minimum 48dB, typical 56dB

Controls: Rotary GAIN controls, MONO/STEREO/BRIDGE,

FILTER and LIMITER switches

Displays: 2x CLIP, 2x ACTIVITY, PROTECT, POWER ON (LEDS)

Input Connectors: 2x XLR, 2x 1/4” phone (TRS)

Output Connectors: 2x Binding Post, 3x Speakon™ SP-4

Turn On/Off transients: < 15 milliwatt / seconds, 0.5 Wpk. (1s on delay)

Power Consumption: Typ 1130, Max 1800 Watts

Transformer: Toroidal

Protection: Fully protected: DC, LOAD and THERMAL

Cooling: Aluminum Heatsinks with DC servo–controlled fan (in front, out rear)

Size: (DWH) 44 cm x 48 cm x 9 cm (front panel to binding posts)

(DWH) 17.5 in x 19 in x 3.5 in Two rack spaces

Weight: 43.5 pounds, 19.8 Kilograms

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4625 Witmer Industrial Estate, Niagara Falls, New York USA 14305

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4625 Witmer Industrial Estate, Niagara Falls, New York USA 14305

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Yorkville Sound YS4040 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual