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AP4020
1. Parts List 2. Pot Board · M1128 Schematic · M1128 PCB layout 3. Input Board · M1129 Schematic · M1129 PCB layout

WEB: www.yorkville.com
WORLD HEADQUARTERS CANADA Yorkville Sound
550 Granite Court Pickering, Ontario L1W-3Y8 CANADA Voice: (905) 837-8481 Fax: (905) 837-8746

4. Power Supply Board · M1127 Schematic · M1127 PCB layout

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

5. Power Amp Module · M1126 Schematic · M1126 PCB layout 4. Service Kit · M1146/m1126

SERVICE MANUAL
s-ap4020.pdf v3.3 6/2002

Quality and Innovation Since 1963
Printed in Canada

IMPORTANT SAFETY INSTRUCTIONS
YS # 3570 5906 5908 6408 6419 6425 6438 6825 6934 6439 6440 6450 6822 6824 6432 6429 6465 6463 6433 5101 5102 5103 5107 5108 6854 5105 5106 6814 6815 6873 6874 6752 6933 6900 6989 6990 6927 6840 5190 6444 6859 6880 6478 6489 5200 5410 5197 5412 5417 5201 5416 5422 5273 5427 5209 6451 5834 5210 6435 5308 5226 5228 5314 5229 5231 5882 5255 5259 5281 5629 5945 5260 5961 5267 5630 5621 5618 5895 4520 4390 Description 14 PIN SCKT 641261/3 OR W3114T RED 3MM LED 1V9 20MA .4 SPACER T&R GRN 3MM LED 1V9 20MA .4 SPACER T&R GREEN 3MM LED 1V9 5MA FROSTED BRIDGE 35A 400V WIRE LEAD GI3504 BAV21 200V 0A25 DIODE T&R 1N4004 400V 1A0 DIODE T&R 1N4148 75V 0A45 DIODE T&R MR854 400V 3A0 DIODE FAST RECOV 1N5225B 3V0 0W5 ZENER 5% T&R 1N750ARL 4V7 0W5 ZENER 5% T&R 1N5242B 12V0 0W5 ZENER 5% T&R 1N4745A 16V0 1W0 ZENER 5% T&R 1N5246B 16V0 0W5 ZENER 5% T&R 1N5248B 18V0 0W5 ZENER 5% T&R 1N4747A 20V0 1W0 ZENER 5% T&R 1N5250B 20V0 0W5 ZENER 5% T&R 1N5251BRL 22V0 0W5 ZENER 5% T&R 1N5257B 33V0 0W5 ZENER 5% T&R BC550C TO92 NPN TRANS. T&R BC560C TO92 PNP TRANS. T&R MPSA06 TO92 NPN TRANS. T&R 2N5551 TO92 NPN TRANS. T&R 2N5401 TO92 PNP TRANS. T&R 2N6517 TO92 NPN TRANS. MPSA13 TO92 NPN DARLINGTONT&R MPSA63 TO92 PNP DARLINGTONT&R MJF6668 221D- PNP DARLINGTON MJF6388 221D- NPN DARLINGTON MJE340 TO126 NPN TRANS MJE350 TO126 PNP TRANS. MTP10N15L TO220 N CHAN MOSFET MTP23P06 TO220 P CHAN MOSFET YS6900 (22) TO3 NPN TRANS. MJL1302A T03P PNP TRANS PWR MJL3281A T03P NPN TRANS PWR YS6927 (23) TO3 PNP TRANS. MC33078P IC DUAL OP AMP MBS4992 TO92 8V5 DIAC T&R MAC224-4 TO220 40A TRIAC 200V NSL-28AA OPTO-COUPLER 4N35 OPTO-COUPLER AS35FN-TO92 TEMPERATURE SENSOR 5R0 20% NTC THERMISTOR _10P 200V 5%CAP T&R RAD CER.2"NPO 100P 100V 10%CAP T&R BEAD NPO 220P 100V 2%CAP T&R RAD CER.2"NPO 220P 100V 10%CAP T&R BEAD NPO 330P 50V 10%CAP T&R BEAD NPO 470P 100V 5%CAP T&R RAD CER.2"NPO 470P 50V 10%CAP T&R BEAD NPO __1N 50V 10%CAP T&R BEAD NPO __1N5 200V 5%CAP T&R RAD CER.2"NPO __2N2 500V 10%CAP T&R RAD CER.2" YB __4N7 250V 5%CAP T&R RADIAL.2"FILM __4N7 250V 20%CAP AC Y ONLY RAD10MM _10N 250V 20%CAP RAD POLYFILM BULK _22N 100V 10%CAP T&R RADIAL.2"FILM _22N 275V 20%CAP AC X2 RAD BLK15MM _47N 50V 10%CAP T&R BEAD X7R _68N 100V 5%CAP T&R RADIAL.2"FILM 100N 100V 5%CAP T&R RADIAL.2"FILM 100N 50V 10%CAP T&R BEAD X7R 150N 63V 10%CAP T&R RADIAL.2"FILM 220N 63V 10%CAP T&R RADIAL.2"FILM 220N 250V 10%CAP RAD POLYFILM BULK __1U 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" _10U 160V 20%CAP RADIAL ELECT BULK _10U 63V 20%CAP T&R RADIAL ELECTR _22U 50V 20%CAP T&R RADIAL ELE.2" _33U 16V 20%CAP NONPOLAR T&R RAD 100U 25V 20%CAP T&R RADIAL ELE.2" 330U 25V 20%CAP RADIAL ELECT BULK 470U 63V 20%CAP RADIAL ELECT BULK 470U 25V 20%CAP RADIAL ELECT BULK 6800U 63V 20%CAP RADIAL ELECT BULK 10K TRIM POT (ENCLOSED) _10K AUDIO DETENT STYLE"P22"16MM
= critical conponents

AP4020 Parts List 2/16/99
Qty. YS # Description 1 2448 15.0 AMP CIRCUIT BREAKER 3 3820 4UH COIL 14AWG ZOBEL HORIZONTAL 3 3601 RING TERMINAL 16AWG WIRE & #8 SCREW 3 3615 STAR RING TERMINAL 18 AWG #10 SCREW 2 3410 RED ON LEFT DUAL BINDING POST TPP4 4 3415 RED ON RIGHT DUAL BINDING POST TPP4 11 3918 1/4" SLIM JACK PC MOUNT W/SCREW 51 3628 PC-MOUNT 250TAB SPEAKON #4SCREW GRY 20 3657 FEMALE XLR PC MOUNT HORIZONTAL 2 3860 FAN 80MM X 80MM 40CFM 12VDC 9 3894 AAVID 5972-B H/S W/TAB B.O. 4 3501 B52200F006 COMP WASH #4 SMALL 4 3552 NYLON SPRING CLAMP 2 3827 SQUARE BUMPER BUTTON BLACK 2 8433 AP SERIES PLASTIC KNOB 1 8661 BUTTON KNOB FLAT GREY 2 3468 8? 3/16 SJT AC LINE CORD STRIP 17" 1 3821 HEYCO #1200 STRAIN RELIEF 3 3638 12 CIR CABLE HOLDER .098 14 3676 8 CIR CABLE HOLDER .098 14 8701 4-40 KEPS NUT ZINC 3 8793 4-40 HEX NUT ZINC 2 8760 6-32 KEPS NUT TIN PLATED 4 8800 6-32 KEPS NUT ZINC 2 8720 #8 SPRING NUT 1 8797 5/16-18 KEPS NUT JS500 1 3797 TO-247 THERMO CONDUCTIVE PAD 1 3815 TO3 PREGREASED MICA 56-03-2AP 2 3823 TO-220 THERMO PAD SMALL HOLE 6 3846 TO220 THERMO PAD LARGE HOLE 56359B 6 3580 12 CIR WAFER W/LCK VT 0.1" 2 3583 8 CIR WAFER W/LCK 0.1" 2 4745 5.0W 0R1 5% BLK RES 16 4749 5.0W 0R15 5% BLK RES 2 4974 1.0W 0R47 5%FLAME PROOF T&R RES 2 4677 1/2W 1R 5% T&R RES 16 4973 1.0W 1R 5%FLAME PROOF T&R RES 5 4688 1/2W 2R2 5% T&R RES 2 4911 1/4W 2R2 5% T&R RES 2 4748 2.0W 3R9 5% BLK RES 2 4733 5.0W 5R6 5% BLK RES 4 4605 1/8W 10R 5% T&R RES 2 4610 1/4W 10R 2%FLAME PROOF T&R RES 2 4875 1/4W 10R 5% T&R RES 4 4930 1/4W 10R 5% .2"U T&R RES 2 4591 1/8W 22R1 1%FLAME PROOF T&R RES 1 4607 1/8W 39R 2%FLAME PROOF T&R RES 13 4899 1/4W 39R 5% T&R RES 2 4811 1/4W 68R 5% T&R RES 2 4590 1/8W 100R0 1%FLAME PROOF T&R RES 2 4859 1/4W 150R 5% T&R RES 2 6201 1/4W 200R 1%FLAME PROOF T&R RES 2 4645 1/8W 220R0 1%FLAME PROOF T&R RES 6 4857 1/4W 220R 5% T&R RES 2 4977 1/4W 220R 5%MINI T&R RES 1 4606 1/8W 249R 2%FLAME PROOF T&R RES 2 4867 1/4W 270R 5% T&R RES 11 4855 1/4W 330R 5% T&R RES 2 4821 1/4W 470R 5% T&R RES 2 4980 1/4W 470R 5%MINI T&R RES 4 4891 1/4W 620R 5% T&R RES 3 4823 1/4W 1K 5% T&R RES 4 4981 1/4W 1K 5%MINI T&R RES 4 4854 1/4W 1K2 5% T&R RES 2 4718 5.0W 1K5 5% BLK RES 4 4988 1/4W 1K5 5%MINI T&R RES 3 4791 1/4W 1K54 1% T&T RES 6 4683 1.0W 1K8 5% T&R RES 2 4808 1/4W 2K 5% T&R RES 4 4847 1/4W 2K2 5% T&R RES 2 4804 1/4W 3K 5% T&R RES 10 6124 1/4W 3K 5%MINI T&R RES 8 4826 1/4W 3K3 5% T&R RES 3 4756 1/4W 4K120 0.1% *** T&R RES 6 4827 1/4W 4K7 5% T&R RES 4 4982 1/4W 4K7 5%MINI T&R RES 1 4887 1/4W 7K5 5% T&R RES 16 4663 1/2W 8K2 5% T&R RES 2 4990 1/4W 8K2 5%MINI T&R RES 2 4762 1/4W 9K760 0.1% *** T&R RES Qty. 1 2 1 4 1 1 2 3 2 1 8 23 1 11 2 3 1 1 1 2 20 3 64 2 2 1 4 32 4 4 1 2 12 4 2 4 4 3 8 2 2 1 8 2 1 2 16 6 2 4 4 6 4 4 7 8 4 2 4 5 2 6 6 1 4 6 4 2 6 2 4 2 4 2 8 6 5 2 2 8 YS # Description 4629 1/2W 10K 5% T&R RES 4800 1/4W 10K0 1% T&R RES 4829 1/4W 10K 5% T&R RES 4983 1/4W 10K 5%MINI T&R RES 6116 1/4W 10K0 1%MINI MF T&R RES 4856 1/4W 12K 5% T&R RES 4901 1/4W 13K 5% T&R RES 4830 1/4W 15K 5% T&R RES 4771 1/4W 17K8 1% T&R RES 6125 1/4W 18K 5%MINI T&R RES 6123 1/4W 20K0 1%MINI MF T&R RES 4832 1/4W 22K 5% T&R RES 6118 1/4W 22K 5%MINI T&R RES 4833 1/4W 27K 5% T&R RES 4840 1/4W 33K 5% T&R RES 4853 1/4W 39K 5% T&R RES 6119 1/4W 47K 5%MINI T&R RES 4835 1/4W 56K 5% T&R RES 4836 1/4W 68K 5% T&R RES 4838 1/4W 100K 5% T&R RES 6120 1/4W 100K 5%MINI T&R RES 4851 1/4W 120K 5% T&R RES 4790 2.0W 150K 5%10MM BODY T&R RES 4886 1/4W 200K 5% T&R RES 4841 1/4W 220K 5% T&R RES 6126 1/4W 220K 5%MINI T&R RES 4843 1/4W 470K 5% T&R RES 4844 1/4W 1M 5% T&R RES 4948 1/4W 1M 5% .2"U T&R RES 4951 1/4W 4M7 5% .2"U T&R RES 6132 1/4W 8M2 5%MINI T&R RES 3700 RELAY 2C 01AMP DC24 ???MA PC-S 3721 RELAY 1A 16AMP DC24 022MA PC-C 3604 21" 14C-28AWG DIP HDR CABLE .050" 3706 13" 8C-26AWG RIB 1 W/LCK HDR 0.1" 3740 15" 12C-26AWG RIB 1 W/LCK HDR 0.1" 8865 4-40 X 5/16 PAN PH MS SJ500 8742 4-40 X 3/8 PAN PH TAPTITE JS500 8861 4-40 X 3/8 PAN PH MS SJ500 8741 4-40 X 1/2 PAN PH MS JS500 8827 4-40 X 1/2 FLAT PH TAPTITE SJ500 8871 4-40 X 5/8 PAN PH MS SJ500 8799 #6 X 1/4 PAN PH TYPE B JS500 8832 6-32 X 1/4 PAN PH TAPTITE SJ500 8801 6-32 X 3/8 PAN PH TAPTITE SJ500 8829 6-32 X 3/8 FLAT PH TAPTITE BO#4 HEA 8761 6-32 X 1/2 PAN PHIL MS ZINC CLEAR 8806 6-32 X 1/2 PAN PH TAPTITE SJ500 8837 6-32 X 1/2 ROUND PH MS SJ500 8824 8-32 X 5/16 PAN QUAD TAPTITE SJ500 8869 8-18 X 1/2 THRD CUTTING FOR PLASTIC 8999 8-32 X 5/8 PAN PH TAPTITE SJ500 8719 8-32 X 3/4 FILLISTER PHIL MS JS500 8815 8-32 X 3/4 PAN PH TAPTITE SJ500 8809 10-32 X 1/4 PAN PH TAPTITE SJ500 8749 10-32 X 1/2 QDX PH TAPTITE JS500 8731 10-16 X 5/8 TYPE B HEX W/SLOT JS500 8736 5/16-18X2-3/4 GRD 5 HEX BOLT JS500 8663 11/64 NYLON SPACER (MICRO PLASTIC) 8629 10-32 X 1/4 SPACER PHENOLIC 3746 21/64 X .250 OD #6 SPACER ALUMINUM 3751 SNAP IN 5/16 SPACER RICHCO 3739 CUSTOM .4 LED SPACER 3743 SNAP ON 0.5" SPACER RICHCO 3859 1/2 PLASTIC HEX SPACER #4 3858 3/4 PLASTIC HEX SPACER #4 8667 SHOULDER WASHER SWS-229 LENGTH 1/8 8818 3/4 OD X 5/16 ID X .08 THICK WASHER 3511 #6 FLAT WASHER NYLON 8491 #10 SPLIT LOCK WASHER BO 8850 #10 INT TOOTH LOCKWASHER BO 3502 NYLON FLAT WASHER OD.158ID.110H.070 3436 DPDT PUSH SW PCMT H BREAK B4 MAKE 3587 DPDT ROKR SW QUIK 250" AC/PWR IEC65 3705 4P3T SLID SW PCMT H 3417 PC SCREW TERMINAL PC MOUNT 7584 SQUARE-CUT O RING FOR AP AIR FILTER 8432 AP SERIES AIR GRILL 1196 AP4020 T?RD Qty.
8 5 8 3 12 4 4 4 2 2 2 6 1 3 3 4 3 4 4 2 2 2 2 1 2 6 2 1 1 2 2 1 1 1 2 1 2 2 8 11 6 8 2 1 4 18 64 2 1 2 4 17 2 5 4 2 12 1 66 8 2 3 6 10 2 4 4 2 5 17 4 2 3 1 1 1 1 1 1

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 REDUIRE LES RISQUE DE CHOC ELECTRIQUE, N'ENLEVEZ PAS LE COUVERT (OU LE PANNEAU ARRIERE). NE CONTIENT AUCUNE PIECE REPARABLE PAR L'UTILISATEUR.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

CONSULTEZ UN TECHNICIEN QUALIFIE POUR L'ENTRETIENT.

Read Instructions:
The Owner's Manual should be read and understood before operation of your unit. Please, save these instructions for future reference.

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

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:

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:
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.

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.

Hazard:
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.

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

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

SERVICE MANUAL

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

SERVICE MANUAL

Yorkville AP4020 Power Amplifier M1129 "THE INPUT BOARD"
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.

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 M1127. 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.

M1126 "THE VOLTAGE AMPLIFIER AND CURRENT AMPLIFIER"
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 8.1 volts peak (at the output of U201) to approximately 70v peak, which is required to drive the current amplifier section. The current amplifier provides the current required for the 70v peak signal to drive 1200 watts into 2 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 M1126. 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.

M1128 "VOLUME CONTROL BOARD"
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 AP4020'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 M1126) 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+.

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

550 Granite Court, Pickering, Ontartio CANADA L1W-3Y8 4625 Witmer Industrial Estate, Niagara Falls, New York USA 14305

1

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

1

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

SERVICE MANUAL

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

SERVICE MANUAL

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 6 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 100 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 23mA 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]

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.

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

550 Granite Court, Pickering, Ontartio CANADA L1W-3Y8 4625 Witmer Industrial Estate, Niagara Falls, New York USA 14305

2

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

2

Y orkville Sound · http://www.yorkville.com

SERVICE MANUAL

Y orkville Sound · http://www.yorkville.com

SERVICE MANUAL

This causes Q40 to turn off until the reduced current flowing through Q5 maintains 0.5V across R12. Q1 will turn 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 vary, 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).

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 M1126 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 shorted 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 series 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 M1127. As soon as the relay is tripped the audio signal will be turned 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).

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 95V peak. How can an output transistor deliver a 95V peak when its collector is only at 55VDC? It can if its collector is pulled up to 100VDC as the output signal's peak rises above 55VDC. 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 55VDC. 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 46.5vp (55v-(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".

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.

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

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

550 Granite Court, Pickering, Ontartio CANADA L1W-3Y8 4625 Witmer Industrial Estate, Niagara Falls, New York USA 14305

3

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

3

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

SERVICE MANUAL

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

SERVICE MANUAL

NOTE: Every time you replace blown output transistors on a M1126 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.

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 +100VDC 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 turning off will turn 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 M1127) will deliver through D207 a positive current to turn 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).

Only test the triac for one protect cycle as prolonged testing will heat the triac to a high temperature.

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.

M1127 SHUTDOWN CIRCUIT, FAN CONTROL CIRCUIT, and SOFT TURN ON CIRCUIT:
· 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.

Fan Circuit Looking at the schematic to board M1127, here is a quick explanation of the fan control circuit. There is a temperature sensor (AS35) on each M1126 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

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

550 Granite Court, Pickering, Ontartio CANADA L1W-3Y8 4625 Witmer Industrial Estate, Niagara Falls, New York USA 14305

4

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

4

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

SERVICE MANUAL

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

SERVICE MANUAL

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 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 collector of Q207 reaches approximately 45V by robbing current from the base of Q208. 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 12VDC across the fan.

SPECIFICATIONS
Frequency Response: Hum and Noise: THD (1 khz, 4­Ohms): THD(20Hz ­ 20kHz, 4­Ohms): High Pass Filter: Slew Rate: Damping Factor: Crosstalk: Input Impedance: Input Sensitivity: Rejection: Controls: and LIMITER switches. Displays: Input Connectors: Output Connectors: Turn On/Off transients: Power Consumption: Transformer: Protection: Cooling: Size: 2 Rack Spaces Weight: +/- 1dB, 20 Hz to 20 KHz -103 dB below max output RMS voltage, unweighted <0.01% <0.1% 40Hz, 12 dB/octave Power amp section: 25 V/uS, 50 V/uS in bridged mode > 600, 20 Hz - 400 Hz, into 8 ohms. -75 dB below full output at 1khz, -60 dB below full output (20 Hz - 20 KHz). 20 KOhms balanced, 10 KOhms unbalanced 1.4 VRMS sine wave. (AP4020: 36 dB, AP4040: 39 dB gain). [email protected]: minimum 48dB, typical 56dB Rotary GAIN controls, MONO/STEREO/BRIDGE, FILTER, 2x CLIP, 2x ACTIVITY, PROTECT, POWER ON. (LEDS) 2 x XLR, 2 x 1/4" phone (TRS) 2 x Binding Post, 3 x SpeakonTM SP-4 < 15 milliwatt / seconds, 0.5 Wpk. (1s on delay) Typ 1130, Max 1800 Watts Toroidal Fully protected: DC, LOAD and THERMAL Aluminum Heatsinks with DC servo­controlled fan (in front, out rear) 44 cm x 48 cm x 9 cm (DWH) 17.5 in x 19 in x 3.5 in (DWH) (front panel to binding posts) 43.5 pounds. 19.8 Kilograms

Thermal Shutdown Circuit 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 voltage on the emitter of Q210 rises until at 85 degrees Celsius on the M1126 heatsinks. 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 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 relay back on enabling the amplifier.

Identifying Defective Boards in the AP4020
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 power supply (M1127 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 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 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 with the fan circuitry on the M1127 board, but it can also be caused by M1126 circuit problems. A damaged AS35 temperature sensor located under the M1126 heatsinks can cause erratic fan behavior. · No output on either or both channels could be caused by intermittent push 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. 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 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 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 conditions, there should only be 3 to 5 millivolts across test points 8 and 9 on the output stage of the amplifier.

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

550 Granite Court, Pickering, Ontartio CANADA L1W-3Y8 4625 Witmer Industrial Estate, Niagara Falls, New York USA 14305

5

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

5

VOLUME CONTROL/ LIMITER
+18 D2 500mW 4.7V Q6 BC560 R49 15K R48 4K7 R7 10K LCLIP R50 15K R47 470R D6 4148 R51 220K C36 16v 22u C3 25V 47n R52 470R R53 220R

+18

ACTIVITY LEDS CIRCUIT
LVGND +18 220p C126 25V 100n C127 50V 100n 100K C2 220n 15v C22 R1 8M2 R36 LVGND 470K R4 Q2 A63 LD2
GREEN

3V0 1N5225B D3

(V+)-3v

Q5 BC560

R_ACTIVITY

-18

L_CLIP

LD6
RED

LD8 NSL28AA R43 22K C41 50V 330P

C39
C17 100P R35 20K0 6 7 LSPOST LREF RSIG LVGND RREF LCLIP RCLIP +18 -18 ACT LD4
GRN

220R R55A

LVGND

L_GAIN
P2 10K
CW

25A GAIN 16V

C26 33u R44 10K

R45 4K12

LSPOST
LSIG LREF RSIG RREF LCLIP RCLIP +18V GND -18V PRTCT ACT 220R R55B

C38 15v 220p

5

U2
1/2

MC33078P (4=V-,8=V+)

+18 8 +18 -18 LVGND LSPOST BRPRTCT LREF RREF 14 RSPRE LSPRE RSPOST LIMABLE RSIG 7

+18 LVGND -18 Q3 BC560 R32 15K R33 4K7 R8 D9 4148 R31 220K

C35 16v 22u C4 25V 47n R30 470R

LD3
RED

R29 220R

PROTECT

LVGND

BRPRTCT POWER

RCLIP

R39 15K

10K R34 470R

Q4 BC560

R136 1K2

+18

-18 1

8M2 R5 100K R2 220n 15v C21 220p C1 ACT 470K R3

LD1
GREEN

L_ACTIVITY
3V0 1N5225B D1

R_CLIP

LD5
RED

LD7 NSL28AA R46 22K C40 50V 330P R42 20K0 2 1 C37 15v 220p 3 U2
1/2

Q1 A13

LVGND

C18 100P

R_GAIN
P1 10K
CW

25A GAIN 16V

C25 33u R41 10K

R40 4K12

M1128.SCH_DATABASE_HISTORY
MODEL(S):# DATE
1 2 3 4 5 6 7 8 9 10
YORKVILLE

AP4020/AP4040/AP2020 VER# DESCRIPTION OF CHANGE
1.00 1.10 . V V V V V V V FIRST_PRODUCTION PC#5694_ADD_CONNECTIONS_FOR_BRPRTCT BETWEEN_14_PIN_CONNECTOR_&_RIBBON N N N N N N N
SHEET OF 1 SCH VERSION: TITLE: POT-BOARD 1.10

MC33078P (4=V-,8=V+)

OCT/97 APR/22/98 . D D D D D D D

DATE: APR/22/98 NAME: M1128.SCH

MODELS: PCB#&VER:

AP4020/AP4040/AP2020 POT-BOARD M1128

LSPOST LREF RREF RSIG ACT

RREF LREF

J12

V-

TO P.S. PCB

CONN3A

J7 Q6 BC560 15K 4K7 10K 470R J8 PROTECT LD3 RED D6 R5
4148

J5 J4 R49 R48 R7 R47 Q1 8M2 A13 R3 C1 LD6 L_CLIP RED 15K R50 220p
3V0

15K 100K D1 J11
-

R39 R2 BC560 R4 J10 D9 R55A D3 C4 P2 22u 16v C35 R31 220K
4V7

SPC2

LSPRE

Q3

220n

Q2

LD5

4148

POWER

470K NSL-28AA R55B GRN LD1

SPC1

C36

U2

33078P

22u 16v

1K2 220R 470R 220K 47n

Q5 LD8 #6859 R136 R53 R52 R51 C3 J2

SPC3

J3 C26 33u 16V R43 22K 330P C39

10K 220p 4K12 20K0 100P

D2 R44

100n C127

C38 R45 R35 C17

100n 10K 220p 4K12 R40 100P C18 20K0 R42 R41 C37

BC560

#6859

LD7

10K

R_ACTIVITY

Q4 NSL-28AA

BC560

L_ACTIVITY

-

-

126 33u 16V C25 R46 22K 330P C40

VCD
M1128.PCB_DATABASE_HISTORY
MODEL(S):- AP-4020 # DATE VER# DESCRIPTION OF CHANGE
1 2 3 4 5 6 7 8 9 10 11 OCT/97 APR/17/98 . DEC/09/98 . D D D D D D 1.00 2.00 . 3.00 . V V V V V V FIRST_PRODUCTION PC#5664_RIBBON_CABLE_CONNECTIONS CHANGED_FOR_PROTECT_CIRCUIT PC#5736_TRACES_CHANGED_POT_SUPPORT SCREWS_ADDED N N N N N N

NOTES
STYLE "P22"

1 P1 AND P2 FOR NORTH AMERICAN USE PART #4390 P22 2 P1 AND P2 -M1128VC POT FOR VC2402 USE PART #4394 3 ADD A STICKER OVER THE AP-4020 LEGEND "M1128VC" TO AID PCB 3511 IN IDENTIFYING WASHER 8870 SCREW VC2402 BOARDS

LED SPACER PT#3739

GRN LD4

L_GAIN J6 220R

3V0

47N 470R 220R R29

R36 LD2

8M2 GRN

R_GAIN 10K

R30

-

+

C21

220R

RED

-

0.4"

470K

R_CLIP

220n C22

220p 15K 4K7 470R 10K A63

C2 R32 R33 R34 R8

RSPRE

R1 100K J9

J13

BLACK J1

14-PIN.SOCKET

RSIG LIMABLE RSPOST P1

V+

M1128 AP4020/4040 VER 3.00

LSPOST

PRTCT RCLP LCLP

VLVGND V+

BRPRTCT

J14

BALANCED INPUT
+V 25V 100n
LREF C15 25V 100n C103

FILTER
V+ V+
LVGND LVGND 14_PIN_CONNECTOR RSPRE 1 RREF LREF BRPRTCT LSPOST LVGND-28 VV+

V-

TO PIN 4 OF MC33078 C9 220p R10 56K LREF C34 16v 68N C30 16v 150N LREF TP1 C33 16v 68N R109B 4M7 C29 16v 150N R20 120K 56K R28 D7 4148

2 1

TP2

LEFT CHAN
JB4 2 LIN_XLR 3 NUTRIX 1 1K54 R27 9K760 R22 C11 220p

9K760 R23 MC33078
1/2

C23 3 U3 16V 33u 1/2 MC33078P (4=V-,8=V+) FILTER SWITCH -1dB 6Hz
5

IN
4

3 2

OUT
6

U4

-1dB 40Hz 12Db/Oct . S2

VLSPRE

LSPRE RSIG LIMABLE RSPOST FROM_POT_PCB

1 C10 220p

S1

LREF JB2 1 3 5 LIN_PH
S R T

C12 220p R25 1K54 9K760 R26

V+
ENABLE

V-

9K760 R24 STEREO,MONO: RSIG = RSPOST BRIDGED: RSIG = LSPOST MONO-STEREO-BRIDGE S3
9

THIS SIDE OF SWITCH NOT USED
MC33078 1/2 U4 5 7 6 (4=V-,8V+)

3

OUT
1

OUT
2

LREF
LREF

IN

IN DISABLE

NO_GOLD 2 4 6 S3
1

R6 33K

LIMABLE

LIMITER
RREF RSIG LREF RSPOST

L COM M R 2 3 4

V+
C13 25V 100n C116 22n C14 25V 100n

GND_LIFT S4 S4
1 OUT 2 IN 3 IN 6 OUT 5 4

CHGND

L COM M R 10 11 12

S3
5

L COM M R 6 7 8 L COM

.
M R

10R R111 10R R112

(4=V-,8=V+) MC33078P
1/2

CHGND

7

U1 10K0 R37

5 6

R119 10K0 LREF 10K0 R38 LVGND-28

LSPOST RREF

VLVGND

RIGHT CHAN
RREF NO_GOLD 2 4 6 RIN_PH
S R T

V+

C16 25V 100n C39 25V 100n

RREF AND LREF CONNECT TO LVGND AT THE INPUT JACKS

V- TO
C8 220p

PIN 4 OF MC33078 16V RREF R19 56K C31 16v 68N 56K R9 D4 4148 6 7 5 U3 TP3 C24 33u

BRPRTCT RSPRE

M1129.SCH_DATABASE_HISTORY
1 OCT/97 2 NOV/12/97 3 D 4 DEC/02/97 5 APR/22/98 6 . 7 D 8 D 9 D 10 D

JB1 1 3 5

1K54 R13

JB3 2 RIN_XLR 3 NUTRIX 1 RREF

9K760 R16 C6 220p

9K760 R15 MC33078
1/2

RREF

MODEL(S):- AP4020 # DATE VER# DESCRIPTION OF CHANGE
1.00 2.00 V 2.00 2.10 . V V V V

3 2

U1

1 C7 220p

C5 220p R11 1K54 9K760 R12

9K760 R14

C32 16v 68N R109A 4M7 C27 C28 16v 150N TP416v 150N R18 RREF 120K

1/2 RREF MC33078P (4=V-,8=V+) FILTER SWITCH -1dB 6Hz 2

IN
1

-1dB 40Hz 12Db/Oct

OUT
3

S1

FIRST_PRODUCTION REVERSED_INPUT_POLARITY AND_MADE_VALUE_CHANGES_FOR_AP2020 CHANGED_C27,C28,C29,C30_TO_150N PC#5694_ADD_CONNECTIONS_AT_BRIDGE SWITCH_FOR_BRPRTCT/LVGND-28 N N N N
SHEET OF 1 SCH VERSION: 2.10 TITLE: INPUT-BD

DATE: APR/22/98

MODELS: AP4020/AP2020/AP4040 INPUT PCB#&VER: M1129-2.00

YORKVILLE NAME: M1129.SCH

S4

100N C14

M1129
RIGHT 1K54 1K54 R13 R16 AP2020/AP4020/AP4040 R11

C13 EY2 100N

JB1

PART#3918 PART#3657

VER 4.00
R14 9K760 220P C7 U1
TP4

J31

FROM POTS J38
V+ V14-PIN.SOCKET

PART#3436 GND_LIFT BRIDGE 22N 275V

R12 9K760 9K760 C15 C8

TO_PS

J30 J29

RSPOST LIMABLE RSIG LSPRE

RT V

R38

FUNCTION C116 EY1

C24

J28 LSPOST J27 J26 J25

#3705

STEREO MONO S3

LREF

33078 TP3 R15

16V 16V 33U 33U
C23

J35

JB3

10K0

9K760 220P 100n

220P 220P

1 FOR XLR #3657 USE SCREW PT#8829 UP THROUGH THE BOTTOM 2 FOR M1129B VX1200/2400/J/2402 DO NOT STUFF J40 AND J41 ADD WIRES IN BOARD ASSEMBLY

VCD

R112 10R CHASSIS

RREF

MC2

R111 J9

RSPRE

10R

J42

J10

C5 10K0 R119 100n C39

C6 J17

J13

J11 J12 J40

10K0

J41

33K

J39

R37

J24 J23 J22

BRKT 1

TP2

TP3

R6

C27

D4
4148

R22

9K760 220P C10 J32
TP1

9K760 9K760

C31 68N 150N 56K 56K R19 R9 120K R18 150N C29

PART#3657 JB2 PART#3918 J34 J33

R24

J16

J15

JB4 LEFT

33078

J43 LIMITER PART#3436 S2 R109A C28 150N
4M7

4148

D7

PRODUCTION NOTES

220P C9 9K760 R23 100n C16 220P C12 220P C11 R25 1K54 R26 1K54 R27

33078 U4 J36

J37 J20

U3 R20 120K R28 56K R10 56K 68N C34 C30 150N

68N C32 R109B

4M7

68N C33

FILTER PART#3436

J50

J19 J18

S1

M1129.PCB_DATABASE_HISTORY
MODEL(S):- AP4020/4040/2020/VX1200/2400/2402 # DATE VER# DESCRIPTION OF CHANGE
1 2 3 4 5 6 7 8 9 10 11 OCT/97 NOV/97 D D DEC/02/97 APR/16/98 . JUL/01/98 D D D 1.00 2.00 V V 2.00 3.00 . 4.00 V V V FIRST_PRODUCTION SWITCH_RREF_WITH_LREF_AND RSPRE_WITH_LSPRE_AT_14PIN_CONNECTOR SWAP_INPUTS_TO_BE_NONINVERTING CHANGE_C27_C28_C29_C30_TO_150N PC#5694_PINS_10-12_OF_MC2_CONNECTED TO_BRIDGE_SWITCH ISOLATE_PIN_OF_SWITCH_S3 N N N

ASSEMBLY PCB MECH

C214A 220P 50V BR1 TR1 BLK WC4 TYPE_H 1KVA 120VAC CSA YSL#1300 C1 22n BLK CSA C2 4n7 15AMPS WC10 WC18 3 WC14 GREY WC2 RED 4 WC3 YELLOW 3 WC6 RED GREY 4 35AMP WC13 2 35AMP BR2 1 2 C208 63v 470U C209 63v 470U C210 63v 470U 1 C207 63v 470U EY1 EY12 . . . +100 . . PRTCT RCLIP LCLIP -18 LVGND +18 LSIG LREF RSIG RREF ACT
1 2 3 4 5 6 7 8 9 10 11 12

WC7

RED

EY2 EY10 . +55 . . . EY4 . . EY3 . EY9 . -55 EY5 . . . EY11 . -100 . EY6 . .

HIGH CURRENT TO M1126

YELLOW BLACK BLACK WHITE

PRTCT RCLIP LCLIP -18 LVGND +18

16V

C201A R201A 33U 10K0 2

R203A 10K0
(4=V-,8V+)

4148 D202A D201A 4148

1 3 U201 R202A 10K0

33U C202A 16V

LREF

ACT

16V

C201B R201B 33U 10K0

BLUE

TO VOLUME BOARD R202B 10K0 RREF D216 1N4004

WC17

SL225R012 +55 COM
SURGISTOR

1/2 MC33078 R204A 10K0 C214B LOG 220P 50V R203B 10K0 4148 D202B 6 (4=V-,8V+) D201B 4148 7 5 U201 1/2 MC33078 R204B 10K0

33U C202B 16V

WHITE GREEN 120 VAC 60 Hz LINE

SL225R012 NO BLACK

C-

C+ 1N4004 R240 D240 10K

20V 1W ZD211

1N4004 D213 R242 R243 47K 27K

1N4004 D214 ZD205 500mW 20v ZD206 500mW 33v

D215 1N4004

SURGISTOR

CC215 4U7 Q241 BC550 C216 25V 100u

63V R244 220K R245 1M

Q240 MPSA06 LDRV RDRV 3 REL1 6 WC7.WC4. BLUE WC14. NC NC GREY 2 7 WC2. RED COM C+ C- NO COM NO LOG ROG WC3. 4 1 8 5 YELLOW WC6. BLUE WC18. WHITE 1N4004 D203 DUMMY Q201 A06 WC17. R207 4K7 OVERHEAT SHUTDOWN PRTCT ACT +55

4148 D212 R235 8K2

0.5W

0.5W

CSA C2E 4n7 8AMPS

245V BROWN/BLK 230V WC13.

Q202 20v 2N5401 500mW ZD201 C203 4u7 63v R206 10K Q203 BC550 R211 220K R237 1M

0.5W

TOROID 1075VA CSA 230/245V_50Hz C1E 680n YSL#1196E BROWN . WC10.

C212 Q210 63V 2N5401 4v7 1U 500mW ZD210 R234 4K7 R238 R225 200K 470R D210

R226 22K Q208 A06 R227 220R 4V7 500mW ZD207 ABOUT 5 WATTS Q207 MJF6388 +55

ROG ROSIG RNFB LOG LOSIG LNFB

R213
0.5W

+100 4148 D204 D205 R208 1K5 R209 1K5 22V 500mW ZD202 4148 R210 10K D207

4148 D218 R236 8K2 D211

C204 25v 22n

8K2 18V 500mW ZD208

R215 1K

+18 Q204 MJF6388 R217 FP 10R C205 25v 100u

R228 2R2 25v WC8 . . 40CFM R219 7K5 F1 C213 470u EY7 . .

R229 2R2

R230 2R2

-55

18V 500mW ZD209 R214
0.5W

LVGND R216 1K Q205 MJF6668

R218 FP 10R

C206 25v 100u -18

8K2

1N4004 D206

M1127.SCH_DATABASE_HISTORY
RC 1 2 3 4 5 6 7 8

LC
AC LINE FILTER

1 2 3 4 5 6 7 8

LCLIP LDRV

RCLIP RDRV

GRN/YELL

TRANSFORMER SHOWN WIRED FOR 245VAC INPUT VOLTAGE. FOR 230VAC INPUT VOLTAGE OPERATION BROWN LEAD TO WC10 AND BROWN/BLACK LEAD TO DUMMY TAB 230 VAC 50 Hz LINE

EMF1E

LCLIM LC LPRTCT LC LTSENS LC GND LC LNFB LC LSIG
LC

1 3

BRN GRN/YEL BLU

LC

LNFB LOSIG LOG

RCLIM RC RPRTCT RC RTSENS RC GND RC RNFB RC RSIG
RC

RC

NOTE: CAPACITOR VOLTAGE RATINGS SHOWN ARE MINIMUM REQUIRED. ACTUAL PARTS MAY HAVE HIGHER VOLTAGE RATINGS. ALL UNMARKED DIODES ARE 1N4148.

RNFB ROSIG ROG

1 OCT/97 2 NOV/27/97 3 JAN/19/98 4 APR/03/98 5 . 6 JUL/15/98 7 . 8 OCT/27/98 9 NOV/17/98 10 JAN/21/99
DATE: JAN/21/99

MODEL(S):- AP4020 # DATE VER# DESCRIPTION OF CHANGE
1.00 2.00 3.00 3.10 . 3.20 . 3.30 3.40 3.50

FIRST_PRODUCTION PC#5532_ADD_RELAY_DELETE_TRIAC CORRECTIONS PC#5649_ADD_5R0_SURGISTORS_DELETE R233_&_THERMAL_BREAKER PC#5797_R235,R236_10K->8K2_ZD202_ 27v->22v_ZD210_6V2->4V7_ZD212->JMP R241_4K7->C216_100u/25V CORRECT_C+,C-_AT_REL1 XFMR_WIRE_COLOURS_UPDATED
SHEET OF 1 SCH VERSION: 3.50 TITLE: POWER_SUPPLY/FAN

2

MODELS: AP4020 . PCB#&VER: M1127

YORKVILLE NAME: M1127.SCH

PS

WC3B

BLK

YEL/GND

WC3

TP2

+100 GREEN/CHASS.GND

TP1

TP9

-100

+100

C208

DUMMY FOR CE

C2 250V 4N7

TP10

470u 63V

GREEN

WC17B

WC17

D240

C210 Q240 A06 EY11
GREY

-55

470u 63V

RT V

RT V

C209 J28 J29
RCLIP RCLIM

DUMMY

DUMMY

RTCSA V

EY1

GREY

+55

LDRV LTSENS LOG LNFB LOSIG LOG

RDRV RTSENS ROG RNFB ROSIG

1A(SPST-NO)
NO2 NO1 C1 C2

4004

ROG

+

LCLIP LCLIM

TP4

TP3

-100

M1127 AP4020 VER 6.00

RELAY REL2

C215 63v 4u7

Q241 BC550
WC18

BLUE
EY6

TO BOTTOM AMP

1
C214B 220P R203B 10K0 10K0 J21 R202B 4148 D201B 4148 D202B 10K0 R204B 16V 33U

J24

R240 10K J39 R225 R244 220K R234 R245 1M 1U 27K 63V R243 ZD211

47K R242

20V/1W

. PART#6489 5R0

. PART#6489 5R0

TP6

WC2

RED

+55

33078

C201A

16V 33U

00.6-7211M

J10

C202A

ZD210

ZD205

4V7 470R 4K7 22K

20V

R238

33v

R203A

J9 WHITE REL1

10K0 C214A 220P J18 J16

2N5401 200K Q210

ZD206
R226

J17 100U 25V C206

J26 C205 100U 25V

FAN BLK

22V ZD202 1N4148 D210 7K5 R219 22N C204
-55 RED

J8 EY9 R214
1N4148

AROMAT_RELAY C NC NO
8K2 0.5W 1N4004

18V

D205

1N4004

WC8

1N4004

C213 D212 D218

1N4004

J13 ZD201 1K R216
8K2 0.5W 18V

D216

D213

D214

D215

EY5

C203 63v 4u7

R209 1K5 1K5 R208 J7

20v

ZD208 R215 10R R217 J31

4148

R228

J38

J37

J36

J32

J35

J34

Q207

Q205

J33

E

FAN

B

E

-18V

B

E

+18V

B

MJF6388

MJF6668

MJF6388

VCD

Q204

J30

FAN RED

4148

4V7

J3 J4

Q202

R229

2R2 0.5W 2R2 0.5W 2R2 0.5W

R230 EY7

Q208 A06

J2 220R R227 ZD207

10K A06 R206 Q201 R237 1M 4K7 R207 R210 Q203 10K BC550 2N5401 10R 1N4004 4148 D206 220K D207 R211 J6

8K2 8K2

1K R213

R218

SHEAR THIS WAY

R236 R235 D211

1N4148

1N4004

470uT R 25v V

D204

TP8

4148

WC6

TP7

D203

J11 J12

ZD209 J15 J14

1

P:\1127V60.PRN
TO TRANS PRIM

M1127 AP4020
WC10 TRANS/PRIM BLACK/AC WC13 WC7 WHITE/AC FROM TB1 WC4

M1127.PCB_DATABASE_HISTORY

SHEAR MODEL(S):- VER# DESCRIPTION FIRST AP4020 # DATE
EY3

OF

SHEAR FIRST CHANGE

EY4

BLACK
C207 WC14

C1 EY12

RED

RT470u V RT470u V
63V 63V

1 OCT/97 2 . 3 NOV/13/97 4 NOV/25/97 5 . 6 . 7 DEC/12/97 8 JAN/21/98 9 . 10 . 11 MAR/27/98 12 JUL/15/98 13 . 14 OCT/27/99 15 D 16 D

1.00 . 1.01 2.00 . . 3.00 4.00 . . 5.00 5.10 . 6.00 V V

FIRST_PRODUCTION R232_150R->270R_R233_10R->2R PC#5514_R232_270R->470R PC#_____DELETE_TRIAC_ADD_RELAY_R233 2R0->10R_ZD208/209_20V->18V_U201_TL -072->33078 UPDATE_FOR_AP4040 PC#5578_CORRECT_SPACING_FOR_R228, R229,R230_PC#5579_REDO_AC_FOR_4N7 ADD_DUMMY_TABS_FOR_CE_XFMR PC#5649_ADD_SURGISTORS_DELETE_R233 PC#5797_R235/R236_10K->8K2_ZD202_27K->22K_ZD212->JUMPER_ZD210_6V2->4V7 PC#5695_ADD_TP9,10_THICKEN_TRACKS N N

PRODUCTION NOTES:
1
J25

1
J22 J27 10K0
R201B 4148 4148 C201B

TO TOP AMP
ACT

2

EY10

YEL
TP5

33U 16V
D201A D202A

RSIG RREF LREF LSIG +18 LVGND -18 LCLIP

FOR C1 USE 22N FOR NORTH AMERICAN AND 680N FOR EURO. ADD RTV UNDER RELAY BEND LEADS FLAT TO PCB
RELAY PCB RTV

"053.7 X 051.41=EZIS KNALB BLANK SIZE=14.150 X 7.350"

25V 100U C216

EY2

R202A

C202B

10K0 10K0 R204A
J20

C212 U201

10K0
R201A J19

33U 16V

RCLIP PRTCT

SHEAR THIS WAY

R56A R44A 1K R45A 1K Q13A 2N5401

2WATT

R83

200R:FP

C19A 16v 22u

D16A R41A 7K5 R42A 39K

D23A D21A

R62A FP 39R Q19A MJE350

FP

RT1 10K

BAV21

1W

5W

5W

5W

FP

12V 500mW ZD4 14V0 500mW ZD5

CW

220K R70

D7

R37 D11 22K

5W

R50A 4K7 D18A R51A 1K5

5W

5W

5W

5W

2W

Q16A

R71 100K

C23A 200v 10p

R63A FP 39R Q17A

C1 120v 1n5 C28A 120v 10u

R19 Q2 BC560

R13 43K

249R:1% FP R84 R15 150R C4 2N2 Q41 MJE350 R16 12K 200R:FP Q6

R22 3K

R23 4K7 D5

TP5
D3 D4

C8 63V 1u

4K7 R42 Q10 BC560 R43 C13 16v 22n 470R R44

13K R35A

D9 22K D10 R39 68K R40 1K

BAV21

-100

Q4 BC550 C33 R17 150R FP R18 10K:1% 1N C5 10v 22u R86 470R R45 -F15 4v ACROSS R17
5W

R48 FP 39R 16v 1W ZD9
S G P D

MT1 Q29 Q21 YS6910 Q23 YS6910 Q25 YS6910 Q27 YS6910

MBS4992 G R65 10R

CLIP

0.5W

4

E

NC
3

B CE

U2

GND

M1126.SCH_DATABASE_HISTORY
MODEL(S):# DATE
1 2 3 4 5 6 7 8 9 10 OCT/97 DEC/04/97 . . DEC/17/97 . MAR/03/98 JUL/09/99 AUG/30/99 MAY/31/01

M1126.SCH_DATABASE_HISTORY
MODEL(S):# DATE
1 2 3 4 5 6 7 8 9 10 MAY/31/01 SEP/06/01 . SEP/19/01 JAN/24/02 MAY/23/02 . . D D

C28 63V 6800U C27 63V 6800U C26 63V 6800U

C23 63V 6800U C24 63V 6800U C25 63V 6800U R66 10K
0.5W 0.5W

0.5W

CBE

EBC

EBC

IN OUT REF

U:\M1126V2.PRN

4N35 B

A
1

CLIP

R89 180K

6

C
5 4

R80 220R

ZD10 1N5225B 3V0 D30 1N4004

C E NC

2 3

CLIP CLIM
.

U1 POWER MODULE A SHOWN

PRTCT TSENS GND NFB SIG
R205 47K BC560 ISOTHERMAL TO HEATSINK R49A 2K

M1126
+100

B- B+
TO POWER MODULE B

OUTPUTS

+100
R57A 100R FP 10K R67A Q20A C26A 10v 4u7 4v ACROSS R5 R59A 10R FP +F15 R5 150R FP Q3 BC560 330u 16v C29A 16mA R7 150R R6 10K:1% C3 10v 22u C34 1N Q40 MJE340 R87 470R 75mA IDLE

R30 620R

C9 200v 4N7 R29
5W

R31 39R

C10 100v 2N2
D G N S

1K5 ZD8 16v 1W R28

Q11 MTP10N15L Q13 YS6909 R32 39R FP Q15 YS6909 Q17 YS6909 Q19

D21 MR854

SPEAKON
1+ 122+

+55
R47A 1K5 D17A R55A R39A 7K5 C18A 16v 22u R40A 220R D13A D14A 10K:1% Q12A 2N5551 R46A 4K7 C22A 200v 10p Q15A

3K3 R68A Q14A

BC550

+55
YS6909

C27A 120v 10u FP 39R R66A 10R FP Q18A MJE340 1.6 WATTS

A/BRIDGED

R38A 39K

R58A

C2 6n8 R8 12K R82 200R;FP

4 WATTS Q5 MJL3281A D1 D2

C11 120v 220n

TP6
R33
1W

MR854 D22 Q14

MR854 D13 Q16 YS6909

MR854 D14 Q18 YS6909

MR854 D15 SPEAKON Q20
1+

RCLIM RCLIM

0.5W

1R

MJE350

C12 16v 22n

R26 470R Q9 BC550 16v 500mW ZD7 2R2 R27

1R FP C30 50V 22n R35 1K R36 13K R40B 68K

270R R34 R55

YS6909

YS6909

122+

D19A D22A D20A

17K8:1% C20A R43A 16v 2N2 3K D15A

150K R60A

FP

39R R61A

Q1 BC550 R1 39R R3 2R2

TP4
R9 249R:1% LIN FP R11 22R1 FP R12 39R FP R85 0R47 C6 16v 330u

R20 3K Q7 2N6517 350V

R21 2K2

+55

220R0:FP:1%

B

R25 220K R24

TP8 TP10
R53 0R15 R56 0R1 R58 0R1 R60 0R1 L1 4uH R63 R52 0R15 R57 0R1 R59 0R1 R61 0R1 R62 3R9
5W

BP2

TP1
R2 68R R4 2R2 R10 4K7

MJE340

R14 39R

4V7 1N750 ZD12 C7 16v 330u

18K Q8 BC550

R38 2R2 R41

5R6

OUTPUTS BP1

TP9
-55
R51 220R0:FP1% Q22 YS6910 D16 Q24 YS6910 D17 MR854 Q26 YS6910 D18 MR854 Q28 YS6910 D19 MR854

C19 150v 10n

-55
R53A 2K

BC550

3K3 R69A Q21A BC560 C25A 10V 4U7

C31 270R 50V 22n R50 R49
1W

R64A 100R FP

R65A 10R FP

1R FP MJL1302A C14 120v 220n
0.5W

10K R70A

1R

TP7

MR854

33K R64 Q30 MT2 TRIAC_MAC224 G MT1

-55
D20

+55

10u 16v MR854

MT2 C21

R72 1K8 33V 1N5257 ZD13

C32 63V 10U

Q31 AS35 1 IN OUT 3 REF 2 R73 2K

YS6900 YS6927 MBS4992 R74 330R MT1 NC MT2 BC550C BC560C 2N6517 2N5551 2N5401 AS35 B BOTTOM E
VIEW

MJL1302A MJL3281A

MTP10N15L MTP23P06

MAC224

BF871 BF872

MJE340 MJE350

R46 1K

1K5 C15 200v 2n2 4N35 B R81
1

Q12 MTP23P06

R47 39R

C16 100v 470p D31 1N4004

A

3.0V/500mW 1N5225B ZD11

GDS

BCE

E CB

R88 180K

6

C
5

220R

C

2

IDLE CURRENT ADJUST FOR 3 TO 5 MILLIVOLTS BETWEEN TESTPOINTS 8 & 9

-100
C29 63V 6800U C22 63V 6800U R69 10K R68 10K

G MT2 MT1

+100

+55 -55
R67 10K -100

AP-4020 VER# DESCRIPTION OF CHANGE
1.00 1.10 . . 1.20 . 1.30 1.40 1.50 1.60 FIRST_PRODUCTION PC#5533_R36,39_68K->47K_R400B,R35A 20K->16K_R31_47R->39R_C10_680P->2N2 C8_2u2/10V->1u/63V PC#5550_R36,R39_47K->68K_R40A,R35B 16K->13K CORRECTIONS SPKON_JACKS_ADDED BRIDGED_SPKON_B->A PC#6381_ADD_R86/R87_C33/C34

AP-4020 VER# DESCRIPTION OF CHANGE
1.60 1.70 . 1.80 1.90 2.00 . . V V PC#6385_C2,C4_1N->2N2 C33,C34_220P->1N PC#6438_ADD_R88,R89 PC#6435_C2_2N2->6N8 PC#6506_ZD10/ZD11_4V7->3V0 PC#6514_Q13->Q20_#6900->#6909 Q21->Q28_#6927->#6910_R5/R17_249R-> ->150R_R13_27K->43K_ZD5_12V->14V N N

DATE: MAY/23/2002 YORKVILLE NAME: M1126.SCH

MODELS: PCB#&VER:

AP4020 . M1126

SHEET

OF

1 SCH VERSION: TITLE: OUTPUT-BD

2.00

EY9

5WATT 0R1

5WATT 0R1

5WATT 0R1

YS6900 Q16 .

YS6900 .

YS6900 .
BLUE

MARCONI HOLE

5WATT 0R15

WC6

BC550

5WATT 0R1

5WATT 0R1

5WATT 0R1

Q24

. YS6927

. YS6927

YS6927 .

1

YS6927 .

BC560

5WATT 0R15

AS35

D20

5R6 5WATT

2K 330R

R31

J10

R64

L1

3 R6

MR854

MAC224-4 DC_PROT TRIAC

C9

10R

33K

39R

R74

1R/1W

R65

4uH

REPPOC.zo2

MJE350 FUNCTION

4N7

R45

R73

G

S

. R84 C33 J23 Q6

MJE340 FUNCTION

.
R49

OUTPUT TAB7

1K5 5WATT

R69 R68 6800u 63V #5895

WC6

2N2/500V C15

J20

0.5W 0.5W

R66 R67

2N2/500V

10K 10K

0.5W 0.5W

10K 10K

Q30

TP7 J22

MR854

16V/1W

16V/1W

39R

Q29

C16

D21

1K5 5WATT

39R

0R47/1W 2R2 4K7

C4 2N2 R15 150R R16 12K R42 R19 249R D3

22R1 J16 249R

4148 4148

22K

R29

R47

R48

1K

R62
J6 J5

1N4004

Q3 4148

1N 470R

R30

D31

2R2

C19

7"YEL 16AWG

Q4

R12 39R

J17

10N 250V

2WATT 3R9

620R

TP10

WC7

R82 200R R5 249R J26 R6 10K0 R8 12K R7 150R C2 6N8

ZD9

470P

ZD8

MBS4992

R32 39R

R86 470R

200R 1N

R10

R4

C21

Q5

68K
BAV21

R85

R39

R3

16V 10U

OUTPUT +

G

Q11 S

Q12 GG D

1R/1W

R33

10K0 249R

1R 1/2W

R28

6800u 63V #5895

4148

22N C30

ZD10

D1 D9

TP6

R38

R40

R11

13K BC550 J30

4148 D4 470R R9

R37

22K

C5

39R

6800u 63V #5895

TP5

68R

4V7

R35A

4148

R25

3K

R72

R2

220N 250V 220N 250V

R80

470R BC550 22N Q9 C12 J32

C32

6800u 63V #5895

R22

C27 6800u 63V #5895 6800u 63V #5895

R1

C23

6800u 63V #5895

BAV21

63V 10U

220K

J29

D30 R36 68K

1K

R42A

Q10

1N5

C11

C14

R38A

J35 D11

R20 R35 R26

J9

"058.01X"057.41=EZIS KNALB BLANK SIZE=14.750"X10.850"

10R

39K

2K2

R65A

R40A

2N2/500V C20A

TAB3 J3

HS2

R88

R89
R63A D19A

J12 J13

180K

J14

TAB4

180K

C7

TAB2

R27 R41

ZD4

+55V

-100V

4N35

R24

GND

1N4004

4N35 U1

R70 R23

VR T

-55V

2N6517

330U 16V

C1

TAB1

1W 1K8

VR T

VR T

C8

VR T

U2

Q7

R55

ZD5

R21

220R

2R2

12V

12V

JZD3 3K

TAB5

18K 4K7

C25

220R0

1U 63V

2R2 BC560

VR T

VR T

VR T

33V

ZD13 R81

R43 R14

VR T

16V 330U

R51 R50

ZD12

C6

+100V

220R

J21

ZD11

C28

3V0 3V0

J33

C22

ZD716V/.5W 220K

VR T

VR T

4K7

22N

C13

C2

C24

J1

Q8

13K R40B

TP1

TP4

J15

VR T

9

D2

C26

39R 220R0 270R

R18

VR T

J2

R17

6800u 63V #5895

C34 R87

R13

4148

1R 1/2W

VR T

1K

D7

R46

R44

C3

39K R71 100K

J11

R59A 10R C19A

220R

Q18A

#3894

Q19A

#3894

22U 16V

22N

Q15A

39R

D17A 10P C22A R47A D18A

47K

D15A

C18A

D16A 4148

22U 16V

R205

Q12A R44A

MJE340
C26A

MJE350
D20A D21A R62A D23A

J19 R55A HS1

#3894

#3894

4148

Q16A

4148

R46A

D22A

R45A

R50A

2N5551

BLK

7K5 7K5

D13A 4148 4148

R39A

R41A

1K5 R51A

4148

1K

1K5

39R

4148

4K7 4K7

10K 3K3

4148

39R

150K

10K0

4148

Q21A R70A

Q13A

4148

4148

1K 2N5401

R68A

EY8

EY1 EY5 EY2 EY6

EY3

100R0 2K

D14A

BC550 10K

R66A 10R

C25A

R61A

BC550

R60A

Q20A

CLIM

6211M

10V 4U7

RED 13" BLK 4"

RED

2W

L+ 1-

R-

C23A

J4

4U7 10V

GND SIG NFB GND TSENSE PRTCT

3K3

RED 2.5"

JB3

EGDIRB 1+. 1-

BLK

39R 10P

R69A

1

BC560

3K 17K8

C27A

R64A

HOLDER=#3676

CABLE=#3706

Q17A

Q14A

R67A

R56A

R43A

C28A

YEL

YEL

C29A TP5A

M1126

2 oz. COPPER

L-

.

R+

BLK

.

J28

ASSEMBLY PCBMECH

M1126-8.10 M1126-8.10

R53A

R49A R57A

2K 100R0

EY4

BLK 14"

B
.

2+

EY7

120V 10u

10u 120V

J25

P:\1126V81.PRN

M1126
YEL

AP-4020
Q13

1

PRODUCTION NOTES
MOUNTING DETAILS FOR 5W
ADD #8629 SPACERS ONLY ON 5 WATT RESISTORS R29, R29A R45 AND R45A

Q17
Q19

MARCONI HOLE Q15

YS6900 .
R56 D13
MR854

YS6900 .
R58

YS6900 .
R60 D15
MR854

YS6900 .
R53 D22
MR854

2

D14
MR854

2 MOUNTING HARDWARE FOR Q5,Q6
#8871 4-40X 1/2" BOLT #3501 BELL WASHER T264 DEVICE #3797 THERMO PAD HEATSPREADER
Q1

1

Q18

Q20

Q14

YS6900 .

J24

PCB #8701 4-40 KEPS NUT TORQUE 4 INCH/LB

Q28

Q26

Q22

Q2

3

MOUNTING HARDWARE FOR Q40,Q41
#8741 4-40X 1/2" BOLT #3501 BELL WASHER T126 TYPE DEVICE #3797 THERMO PAD HEATSPREADER PCB #8701 4-40 KEPS NUT TORQUE 4 INCH/LB

R57
MR854

R61
MR854

R59
MR854 MR854

R52 D16 Q21

D17

D19

D18

Q23

. YS6927 Q27

. YS6927

Q31

YS6927 .
Q25

. YS6927

NOTE #6

TAB6

MJL1302A . HTP23P06

MJL3281A .

MTP10N15L

4 MOUNTING HARDWARE FOR Q11,Q12
J31
J18

S

Q41

#8741 4-40X 1/2" BOLT
RT1
VBE 10K 270R
R34

5.5"PUR 16AWG

Q40

R83 200R BC550 BC560

D10

VR T

VR T

VR T

27K 10V 22U 22U 10V

HEATSPREADER

#3501 BELL WASHER #8667 SHOULDER WASHER T-220 DEVICE #3846 MICA

D5

TP9

PCB #8701 4-40 KEPS NUT TORQUE 4 INCH/LB

22N C31

5 MOUNTING HARDWARE FOR TO3 OUTPUTS
#8835 BOLT TO-3 TRANSISTOR #3815 MICA

M1126 AP-4020 VER:8.10 6211M TP8 01.8-

MJE350

MJE340

01.8-6211M EDISREDLOS
1 MX1

01.8-6211M
BLK 3.5" BLK 18"

LLIRD

HEATSPREADER #8663 SPACER MICA GREASE IS REQUIRED ON BOTH SIDES OF THE MICA PAD

R58A

JB2

1+. 2-

#8800 6-32 KEPS NUT INITIAL TORQUE FOR TO-3'S IS 8 INCH/LB FINAL TORQUE AFTER HEATSINK HAS COOLED FROM WAVE SOLDER IS 6 INCH/LB

A

BC560

330U 16V

BLK

22+ BRIDGE .

CLIP

B

6 7

VCD M1126.PCB_DATABASE_HISTORY
MODEL(S):- AP4020, # DATE VER# DESCRIPTION OF CHANGE
1 2 3 4 5 6 7 8 9 10 11 OCT/97 NOV/10/97 . NOV/19/97 DEC/04/97 . . JAN/13/98 . JAN/27/98 JUN/19/98 1.00 1.01 . 1.10 1.20 . . 1.30 . 2.00 2.01 FIRST_PRODUCTION PC#5520_R35A_16K->20K_ZD7_20V->16V1/2W ROUTING_ADDED_HOLE_SIZE_CHANGES PC#5533_R36,R39_68K->47K_R40B/R35A_ _20K->16K_R31_47R->39R_C10_680P ->2N2_C8_2u2->1u PC#[email protected],@R39_47K->68K_R40B, R35A_16K->13K PC#5577_D21_MOVED_J31,J35_ADDED PC#5767_C10/15/20A_TO_PT#5427_2N2 1 2 3 4 5 6 7 8 9 10 11 12

M1126.PCB_DATABASE_HISTORY
MODEL(S):- AP4020, # DATE VER# DESCRIPTION OF CHANGE
OCT/06/98 3.00 TRACE_CHANGES_TO_ELIMINATE_SHORTS PC#5729_J5-J6_MOVED . . JAN/27/99 4.00 PC#5908_4N35_U1,U2->TLP621 JUN/11/99 5.00 1_SPKON_JACK_DELETED U1-U2_TLP621->4N35_SPKON_JK_PCB_ JUN/23/99 . MOVED_TO_CLEAR_SHEAR . . AUG/12/99 6.00 CORRECT_BRIDGE_JACK_TO_A MAY/31/01 7.00 PC#6381_ADD_C33/C34_R86/R87 PC#6385_C2,C4_1N->2N2 . . SEP/06/01 8.00 PC#6435_C33,C34_220P-AXL->1N_->RAD C2_2N2->6N8_PC#6438_ADD_R88,R89 . . . . PC#6438_ADD_R88,R89 JAN/24/02 8.10 PC#6506_ZD10/ZD11_4V7->3V0

YELL DO NOT STUFF WIRES 2.5" OR SPEAKON JACKS FOR SERVICE BOARDS

YELL 19"

USE #XXXX SMALL BODY 1R 1W FOR R33,R49 MOUNTING DETAILS FOR Q30 TRIAC
USE #8799 TO MOUNT TRIAC Q30

1 IMPORTANT AFTER MOUNTING DEVICE 2 3
1/4" BEND DOWN 1/4" FROM BODY OF TRANSISTOR DO NOT CUT LEGS BEND LEGS IN DIRECTION SHOWN IT IS IMPERATIVE THAT LEGS MARKED 2 AND 3 ARE BENT FLAT AGAINST THE COPPER SURFACE

9 Q31 IS HAND INSERTED AND BENT OVER WITH FLAT SIDE UP AS SHOWN. 10

8 TAB WIRE COLOURS
TAB TAB TAB TAB TAB TAB TAB 1 2 3 4 5 6 7 RED YEL BLK WHT BLU OUTPUT OUTPUT 16AWG 16AWG 16AWG 16AWG 16AWG + -

SERVICE BULLETIN
AP4020 & AP4040

SERVICE BULLETIN
AP4020 & AP4040

Quick Fix for M1146 & M1126
To speed up the servicing of the AP4020 or AP4040 on your bench, Yorkville Sound's service department has developed a method to replace the components most likely to fail when a M1146 amplifier board requires service. This Quick Fix kit contains the procedure, assembly drawings, and components to perform the Quick Fix to a M1146 or M1126 board. It should be understood that the person using this procedure knows how to test resistors, diodes, and transistors to determine if they are defective. This procedure is not intended to be a substitute for one's lack of electronic capability. Before starting, look at the board for repair and locate the version number. It is very important that you follow t