YORKVILLE Keymaster K4 User manual

U.S.A.
Yorkville Sound Inc.
4625 Witmer Industrial Estate
Niagara Falls, New York
14305 USA
Voice: [phone]
Fax: [phone]
WORLD HEADQUARTERS
WEB ACCESS: http://www.yorkville.com
CANADA
Yorkville Sound
550 Granite Court
Pickering, Ontario
L1W-3Y8 CANADA
Voice: [phone]
Fax: [phone]
Quality and Innovation Since 1963
Printed in Canada
SERVICE MANUAL
K4
MODEL TYPE:YS1045

IMPORTANT SAFETY INSTRUCTIONS
safety-4v3.eps • Oct. 26/05
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.
INSTRUCTIONS PERTAINING TO A
RISK OF FIRE, ELECTRIC SHOCK,
OR INJURY TO PERSONS
Read Instructions
The Owner’s Manualshould be read and understood
before operation of your unit. Please, save these instruc-
tions for future reference.
Packaging
Keep the box and packaging materials, in case the unit
needs to be returned for service.
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.
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.
Ensure that proper ventilation is provided around the appliance.
No naked flame sources, such as lighted candles, should be
placed on the apparatus.
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 OPERATETHE UNIT.
Service
The unit should be serviced only by qualified service personnel.
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
INSTRUCTIONS RELATIVES AU RISQUE
DE FEU, CHOC ÉLECTRIQUE, OU
BLESSURES AUX PERSONNES
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.
Emballage
Conservez la boite au cas ou l’appareil devait être
retourner pour réparation.
Attention:
Lors de l’utilisation de produits électrique, assurez-
vous d’adhérer à des précautions de bases incluant
celle qui suivent:
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.
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.
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.
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
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.

K4 Parts List 5/18/2006
YS # Description Qty. YS # Description Qty. YS # Description Qty. YS # Description Qty.
6554 BLUE 3MM LED 3V9 20MA TLHB440VISHAY 1 5281 _10U 16V 20%CAP T&R RAD .2"NP 2 2011 1/4W 11R3 1%FLAME PROOF T&R RES 2 8741 4-40 X 1/2 PAN PH MS JS500 2
6405 RED 3MM LED 1V7 5MA BRT 5 5282 _10U 16V 20%CAP T&R 5X7MM .2"NP 2 4815 1/4W 12R 5% T&R RES 4 8842 #4 X 5/16 PAN QUAD TYPE A JS500 BLK 8
6408 GRN 3MM LED 1V9 5MA FROSTED 1 5629 _10U 160V 20%CAP BLK 10X13MM EL 9 4612 1/2W 18R 5% T&R RES 2 8807 6-32 X 5/16 PAN PH MS JS500 2
6425 BAV21 200V 0A25 DIODE T&R 6 5945 _10U 63V 20%CAP T&R RAD .2"EL 7 4812 1/4W 18R 5% T&R RES 1 8801 6-32 X 3/8 PAN PH TAPTITE JS500 17
6825 1N4148 75V 0A45 DIODE T&R 41 5260 _22U 50V 20%CAP T&R RAD .2"EL 2 4618 1/2W 22R 5% T&R RES 3 8829 6-32 X 3/8 FLAT PH TAPTITE BO#4 HEA 22
6438 1N4007 400V 1A0 DIODE T&R 9 5631 _22U 50V 20%CAP T&R 6X7MM .2"EL 10 4817 1/4W 47R 5% T&R RES 4 8761 6-32 X 1/2 PAN PHIL MS ZINC CLEAR 4
6434 6A2 200V 6A0 DIODE 8 5265 _68U 25V 20%CAP T&R RAD .2"EL 2 4811 1/4W 68R 5% T&R RES 1 8806 6-32 X 1/2 PAN PH TAPTITE JS500 6
6733 BAT85 30V 0A2 DIODE SCHTKYT&R 10 5879 100U 16V 20%CAP T&R 8X7MM .2"EL 4 4912 1/4W 75R 5% T&R RES 1 8878 #6 X 2" PAN PHIL TYPE A JS500 BLACK 4
6439 1N5225B 3V0 0W5 ZENER 5% T&R 1 5610 220U 160V 20%CAP BLK 16X36MM EL 3 4852 1/4W 100R 5% T&R RES 4 8722 #8 X 1" PAN QUAD TYPE AB B/O 20
6461 1N5240BRL 10V0 0W5 ZENER 5% T&R 4 5621 470U 63V 20%CAP BLK 12X25MM EL 2 4659 1/2W 150R 5% T&R RES 6 8809 10-32 X 1/4 PAN PH TAPTITE JS500 8
6822 1N4745A 16V0 1W0 ZENER 5% T&R 2 5616 3300U 50V 20%CAP BLK 18X35MM EL 4 4859 1/4W 150R 5% T&R RES 2 8734 #10 X 1/2 PAN PH TYP A BRITE NICKEL 6
6463 1N5251BRL 22V0 0W5 ZENER 5% T&R 1 4032 _10K 1B LIN 9.5MM HORIZONTAL STP38 2 4857 1/4W 220R 5% T&R RES 10 8753 #10 X 1/2 PAN PH TYPE A JS500 BLACK 4
6871 MC7915CT TO220 N 15V0 REG V2 1 4480 _10K 1B LIN 12MM HOR ST P27 1 4770 1/4W 249R 1% T&R RES 4 8756 #10 X 3/4 PAN PH TYPE A BLACK OXIDE 30
6872 MC7815CT TO220 P 15V0 REG V1 2 4479 _20K 05C R/A 12MM HOR ST P27 2 4867 1/4W 270R 5% T&R RES 10 8781 #10 X 7/8 FLAT PHIL TYPE A JS500BLK 4
5101 BC550C TO92 NPN TRANSISTOR T&R 5 4482 _20K 05C R/A 9.5MM HORIZONTAL STP38 1 4986 1/4W 270R 5%MINI T&R RES 2 8833 10-32 X 7/8 HEX CAP GRD 5 JS500 3
5102 BC560C TO92 PNP TRANSISTOR T&R TB 9 4478 _50K 1B LIN 12MM HOR ST DET P27 6 4872 1/4W 390R 5% T&R RES 1 8727 #10 X 1" PAN PH TYPE A JS500 BLACK 2
5103 MPSA06 TO92 NPN TRANSISTOR T&R TA 1 4477 100K 1B LIN 12MM HOR ST P27 1 4821 1/4W 470R 5% T&R RES 2 8843 10-32 X 1 1/8 FLAT PH MS JS500 2
5104 MPSA56 TO92 PNP TRANSISTOR T&R 7 4529 470R TRIM POT 1 4799 1/4W 562R 1% T&R RES 2 8786 10-32 X 1 1/4 PAN QD MS JS500 BLACK 4
5107 2N5551 TO92 NPN TRNSISTR DARL T&RTA 2 3976 SNAP ON 0.843" INSULATING BUSHING 1 4743 1/4W 681R0 0.1% *** T&R RES 6 8770 1/4-20 X 1 5/16 TRUSS PH MS JS500 5
5108 2N5401 T092 PNP TRNSISTR DARL T&RTA 2 8521 RUBBER BUMPER WITH WASHER VERYSMALL 6 4873 1/4W 680R 5% T&R RES 4 8736 5/16-18X2-3/4 GRD 5 HEX BOLT JS500 1
5109 MPSA43 TO92 NPN TRANSISTOR T&R 4 3463 CLIP 110X020 18-22AWG DISCO/INSL 2 4822 1/4W 820R 5% T&R RES 2 8608 NYLON SPACER .200 OD .145 ID .110 L 4
5106 MPSA63 TO92 PNP TRNSISTR DARL T&RTA 3 3489 CLIP 250X032 18-22AWG DISCO/INSL 10 4726 5.0W 1K 5% BLK RES 2 8866 #6 NYLON SPACER OD.250XID.140X.187 6
5119 2N5638 TO92 NCH JFET T&R TC 3 3490 CLIP 250X032 14-16AWG DISCO/INSL 11 4823 1/4W 1K 5% T&R RES 26 3751 SNAP IN 5/16 SPACER RICHCO 4
5122 J109 TO92 NCH JFET T&R TC 1 3491 CLIP 205/187X020 18-22AWG DISCO/INS 10 4981 1/4W 1K 5%MINI T&R RES 7 7405 5" 8R 30WPGM SPEAKER SEALED BACK 2
6774 BD139 TO126 NPN TRAN TG 2 3601 RING TERMINAL 16AWG WIRE & #8 SCREW 3 6110 1/4W 1K0 1%MINI MF T&R RES 5 7388 12" 2R 170W WOOFER POLY/RUB SRND 1
6787 BD237 TO126 NPN TRAN TG 1 3682 250 MALE PCB TAB REEL 23 4889 1/4W 1K3 5% T&R RES 1 8818 3/4 OD X 3/8 ID X .080 THICK WASHER 2
6788 BD238 TO126 PNP TRAN TG 1 3498 1/4" JCK PCB MT HORZ 5 4824 1/4W 1K5 5% T&R RES 4 8820 #8 FLAT WASHER JS500 2
6815 MJF6388 T221D NPN TRNSISTR DARL TJ 1 3918 1/4" JCK PCB MT HORZ SLIM W/SCREW 8 4683 1.0W 1K8 5% T&R RES 1 8817 #10 FLAT WASHER FOR 3/16" BOLT 5
6902 TIP142 TO218 NPN TRAN DARL TE 2 3460 RCA DUAL PCB MT VERT GOLD .475" 1 4825 1/4W 1K8 5% T&R RES 3 3393 5POS 2S NONSHORTING HORZ ROT SWT 1
6903 TIP147 TO218 PNP TRAN DARL TE 2 3922 XLR FEML PCB MT HORZ THIN SNAP-IN 1 4808 1/4W 2K 5% T&R RES 23 3425 DPDT PUSH SW PCMT BREAK B4 MAKE 3
6909 MJ21196 TO3 NPN TRANSISTOR TH 1 3923 XLR MALE PCB MT HORZ MTHOLE-V SNAP 2 6113 1/4W 2K 5%MINI T&R RES 4 3587 DPDT ROKR SW QUIK 250"AC/PWR ON-OFF 1
6910 MJ21195 TO3 PNP TRANSISTOR TH 1 3451 EYELET SMALL 0.089 OD PLATED 32 4919 1/4W 2K05 1%-NO SUBS- T&R RES 1 3732 9 PIN PC MOUNT TUBE SOCKET BE 2
6804 MC33079P IC QUAD OP AMP 11 3414 INTERNATIONAL PC MOUNT FUSEHOLDER 6 4847 1/4W 2K2 5% T&R RES 10 12AX7 12AX7 DUAL TRIODE PREAMP TUBE 2
6840 MC33078P IC DUAL OP AMP 6 2427 5.0 AMP SLO-BLO .25X1.25 FUSE 3 4714 1/4W 2K21 1% T&R RES 4 CH1339 K4,K2 120V 60HZ T'RD 1
6882 TL072CP IC FET DUAL OP AMP 3 3856 FAN 80MM X 80MM 39CFM 12VDC 200MA 2 4883 1/4W 2K49 1% T&R RES 2
6884 NE5532N IC DUAL OP AMP 10 8565 BAR HANDLE ALL METAL 2 4805 1/4W 2K87 1% T&R RES 1
6745 LM13600N IC XCONDUCTANCE AMP 1 8604 10-32 T NUT 4 4804 1/4W 3K 5% T&R RES 12
6936 4007 IC COMPLIMENTARY PAIRS 2 7286 _8R 30W 4.75"TWEETER 2 4826 1/4W 3K3 5% T&R RES 21
6860 VTL5C8 OPTO-COUPLER 1 3501 B52200F006 COMP WASH #4 SMALL 2 5028 1/4W 3K74 1% T&R RES 2
6467 10K 10% THERMISTOR NTC TO-92 3 3719 DUAL XSISTOR TO218 SPRING YEL PLTD 2 4774 1/4W 4K12 1% T&R RES 5
5400 _10P 100V 10%CAP T&R BEAD NPO 2 3977 QUAD XSISTOR TO220SPRING YELLOWZINC 1 4910 1/4W 4K3 5% T&R RES 2
5402 _15P 100V 10%CAP T&R BEAD NPO 2 8609 VINYL CAP 0.250" X 1/2" BLK. 2 4681 1.0W 4K7 5% T&R RES 2
5404 _27P 100V 10%CAP T&R BEAD NPO 1 8889 RUBBER GROMMET #2183-034-BLK 3 4827 1/4W 4K7 5% T&R RES 14
5406 _33P 50V 10%CAP BLK BEAD NPO 3 3645 AC SOCKET RECEPTACLE WITH 0.250 TAB 1 4639 1/4W 4K99 1% T&R RES 20
5408 _47P 100V 10%CAP T&R BEAD NPO 1 3801 5/8" BUMPER BUTTON BLACK 1 6128 1/4W 4K99 1%MINI MF T&R RES 2
5410 100P 100V 10%CAP T&R BEAD NPO 11 3803 NYLON SECUR-A-TACH MINI PLASTIC TIE 1 4893 1/4W 5K1 5% T&R RES 4
5412 220P 100V 10%CAP T&R BEAD NPO 18 3810 4" NYLON CABLE TIE 15 4862 1/4W 5K6 5% T&R RES 1
5201 470P 100V 5%CAP T&R RAD CER.2"NPO 2 8399 BASSMASTER KNOB, NICKEL PLATED 10 4800 1/4W 10K0 1% T&R RES 14
5420 680P 50V 10%CAP T&R BEAD NPO 13 8504 CORNER, 2 LEGS NOTCED LIP NICKEL 4 4829 1/4W 10K 5% T&R RES 62
5206 __1N 400V 5%CAP T&R RAD .2"FLM 8 8636 BUTTON KNOB FLAT BLACK 3 4983 1/4W 10K 5%MINI T&R RES 3
5422 __1N 50V 10%CAP T&R BEAD NPO 4 8400 BASSMASTER KNOB, NICKEL W/STOPPER 1 6116 1/4W 10K0 1%MINI MF T&R RES 12
5274 __2N2 200V 5%CAP T&R RAD CER.2"NPO 2 3428 8' 3/18 SJT AC LINE CORD REMOVABLE 1 4773 1/4W 12K1 1% T&R RES 1
5209 __4N7 250V 5%CAP T&R RAD .2"FLM 7 8264 YBA/YCV LOGO EMBOSSED ALUMINUM 1 4775 1/4W 14K0 1% T&R RES 2
6451 __4N7 250V 20%CAP BLK 'Y' 10MM AC 1 3538 24 PIN BREAKAWAY LOCK .156 0.167 4830 1/4W 15K 5% T&R RES 2
5433 __5N6 50V 10%CAP T&R BEAD X7R 1 3549 TRIFURCON TERM .156 4 4771 1/4W 17K8 1% T&R RES 2
5204 _10N 100V 10%CAP T&R RAD .2"FLM 2 3558 TERM HOUSING 4 CIR .156/RAMP 1 4885 1/4W 20K 5% T&R RES 10
5834 _10N 250V 20%CAP BLK RAD POLY FLM 2 3654 PCB CONN 4 CIR .100 LOCKING 2 6123 1/4W 20K0 1%MINI MF T&R RES 25
5301 _12N 50V 10%CAP T&R BEAD X7R 3 3668 4 CIR CHASSIS MOUNT HDR .156 1 4832 1/4W 22K 5% T&R RES 7
5210 _22N 100V 10%CAP T&R RAD .2"FLM 6 3672 6 CIR CABLE HOLDER .098 4 4840 1/4W 33K 5% T&R RES 7
5304 _22N 50V 10%CAP T&R BEAD X7R 2 3676 8 CIR CABLE HOLDER .098 2 4834 1/4W 47K 5% T&R RES 9
6435 _22N 275V 20%CAP BLK 'X2' 15MM AC 2 3903 PCB CONN 4 CIR BOTTOM .156 2 4803 1/4W 49K9 1% T&R RES 4
5306 _33N 50V 10%CAP T&R BEAD X7R 14 5989 4 CIR CABLE HOLDER .098 6 4895 1/4W 51K 5% T&R RES 4
5223 _39N 100V 10%CAP T&R RAD .2"FLM 2 8701 4-40 KEPS NUT ZINC 2 4836 1/4W 68K 5% T&R RES 2
5226 _68N 100V 5%CAP T&R RAD .2"FLM 8 8760 6-32 KEPS NUT TIN PLATED 4 4772 1/4W 82K5 1% T&R RES 2
5310 _68N 50V 10%CAP T&R BEAD X7R 2 8800 6-32 KEPS NUT ZINC 11 4838 1/4W 100K 5% T&R RES 29
5212 100N 63V 5%CAP T&R RAD .2"FLM 50 8841 10-32 KEPS NUT ZINC 3 6120 1/4W 100K 5%MINI T&R RES 2
5228 100N 100V 5%CAP T&R RAD .2"FLM 6 8890 1/4-20 CAGE NUT C79-88142027 4 4776 1/4W 113K 1% T&R RES 4
5314 100N 50V 10%CAP T&R BEAD X7R 9 8797 5/16-18 KEPS NUT JS500 1 4796 1/4W 180K 5%MINI T&R RES 2
5229 150N 63V 10%CAP T&R RAD .2"FLM 2 3823 TO-220 THERMO PAD SMALL HOLE 2 4849 1/4W 180K 5% T&R RES 2
5231 220N 63V 10%CAP T&R RAD .2"FLM 2 3916 TO3 SIL-PAD REPLACES MICA 2 4865 1/4W 390K 5% T&R RES 1
5318 220N 50V 10%CAP T&R BEAD X7R 1 4022 ELASTOMER PAD - 2-TO218 / 4-TO220 3 4843 1/4W 470K 5% T&R RES 2
5233 330N 63V 5%CAP T&R RAD .2"FLM 8 8581 CUSTOM PBL TRANSISTOR SPACER 3 4874 1/4W 560K 5% T&R RES 2
5234 470N 63V 10%CAP T&R RAD .2"FLM 8 4597 22AWG STRAN TC WIR JMP 6 4844 1/4W 1M 5% T&R RES 14
5322 470N 50V 10%CAP T&R BEAD Z5U 1 4599 22AWG SOLID SC WIR T&R JMP 245 4888 1/4W 4M7 5% T&R RES 1
5255 __1U 63V 20%CAP T&R RAD .2"EL 1 5299 24AWG SOLID SC WIR RAD JMP 6 4751 1/4W 22M 5% T&R RES 2
5256 __1U 63V 5%CAP T&R RAD .2"FLM 10 4719 5.0W 0R18 5% BLK RES 2 4036 _8" 4C-28AWG RIB 1 W/LCK HDR 098 2
5257 __2U2 63V 20%CAP T&R RAD .2"EL 5 4729 5.0W 0R27 5% BLK RES 4 3623 17" 4C-26AWG RIBBON CABLE 0.1" 1
5258 __4U7 63V 20%CAP T&R 8X7MM .2"EL 2 2006 1.0W 1R 5%FLAME PROOF T&R RES 3 4040 5.0" 6C-26AWG RIBBON CABLE 0.1IN 1
5933 _4U7 100DC 10%CAP BLK RAD POLYE FLM 2 4866 1/4W 4R7 5% T&R RES 2 4041 10" 6C-26AWG RIBBON CABLE 0.1IN 1
5259 __4U7 63V 20%CAP T&R RAD .2"EL 22 4875 1/4W 10R 5% T&R RES 2 4037 5.5" 8C-26AWG RIBBON CABLE 0.1IN 1.5

Input 1
Input 2
Input 2
Channel 1
Channel 2
Footswitch Front Panel
Drive Switch
Channel 3
Block Diagram for Keymaster K4
DESIGNED & MANUFA CTURED BY YORKVILLE SOUND
EQ
Bass/Mid/Hi
Bass/Mid/Hi
L
R
L
L
R
L
R
L
L
R
R
L
R
Input 2
RCA
Input
In L/Mono
Tube
Gain
Tube/Solid State
Switch
Solid
State
Tube
Solid
State
In R
CLIP 1
CLIP 2
CLIP 1
CLIP 2
CLIP 3
CLIP 3
Line Out L
L Bus
GND Lift
R Bus
Gain
Master L
Master R
HP
L Tweeter
Woofer
R Tweeter
L Mid
R Mid
HP
L Amp
LF Amp
R Amp
Ch 4 Gain L
Ch 4 Gain L
Gain L
Gain R
1
2
3
4
5
EQ
EQ L
EQ R
Voicing Select R
Voicing Select L
1
2
3
4
5
L Bus
R Bus
L Bus
R Bus
Channel 4 (Monitor Channel)
Sub Out
Headphone
T=Left/R=Right/S=Gnd
Solid State
Tube Gain Trim L
R
Line Out R
GND Lift
Solid State
Tube Gain Trim R Lead Gain R
Lead Gain L
Gain L
Gain R
In L/Mono
In R
In L/Mono
In R
OD Enable
Circuit
In L/Mono
In R
XLR
Mic In
In L/Mono
In R
OD Enable
Circuit
BLOCK-DIAG-K4-00-1v1.ai
MODEL TYPE:YS1045

www.yorkville.com
REAL Gear.
REAL People.
Yorkville Sound
550 Granite Court
Pickering, Ontario
L1W-3Y8 CANADA
Canada
Voice: [phone]
Fax: [phone]
Yorkville Sound Inc.
4625 Witmer Industrial Estate
Niagara Falls, New York
14305 USA
U.S.A.
Voice: [phone]
Fax: [phone]
SERVICE BULLETIN
1
K4 Pre-amp Tube Replacement
The Two 12AX7A/7025A tubes are inside the chassis.
To remove the chassis from the cabinet follow these instructions.
1. Unplug all connections. Make sure the K4 is unplugged from the AC main line and
remove all instrument and other cable connections.
2. Remove K4 Chassis from cabinet. Before removing K4 chassis from speaker
cabinet, make sure to unplug the speaker connectors.
a) Remove the five top bolts and loosen the vent screws holding the k4 chassis to the
cabinet; this will enable you to push the chassis forward approximately 2 inches until the
speaker wire connections at the
rear left will be visible.
b) Disconnect the connecter while
noting the orientation of the
locking fingers for when you re-
connect them after the tubes
have been changed. Continue
pushing the chassis forward until
it is out of the cabinet.
If the chassis snags on the
cabinet vinyl, reverse the process
and push it out the back of the cabinet.You may find it worthwhile to insert thin strips
of plastic as shims between the chassis and cabinet down the sides to reduce the
chance of snagging.
5. Once the chassis is removed, using
a small Phillips screwdriver, remove the
20 screws that are used to mount the
amplifier lid.You will find the tubes near
the front of the chassis on the left side
(looking from the front). They are held in
place with a retaining bracket which needs
to be unscrewed and removed before you
pull the 12AX7/7025s out of their sockets.
Remove the tube-retainer bracket screws,
and pull the bracket upward. Proceed to
replace the two 12AX7A/7025A tubes.
6. Reinstall the tube bracket and chassis lid screws.
7. Slide the chassis carefully back into the cabinet remembering to clear the speaker wires;
don’t forget to reconnect the speaker wires before sliding the unit into its final position.
8. Reinstall the large retaining bolts and tighten-down the vent plate screws.
Amp Cover
Lid Screws (20)
Tube retaining bracket
Tube retaining
bracket screws (2)
K4 Amplifier
Tubes
Speaker Connection
Lid and Tube Retaining Bracket

www.yorkville.com
REAL Gear.
REAL People.
Yorkville Sound
550 Granite Court
Pickering, Ontario
L1W-3Y8 CANADA
Canada
Voice: [phone]
Fax: [phone]
Yorkville Sound Inc.
4625 Witmer Industrial Estate
Niagara Falls, New York
14305 USA
U.S.A.
Voice: [phone]
Fax: [phone]
SERVICE BULLETIN
2
Remplacement des Lampes Pour le
Préamplificateur K4
Les deux lampes 12AX7A/7025A sont à l’intérieur du châssis.
Pour retirer le châssis de l’enceinte suivez les instructions ci-dessous.
1. Débranchez toutes les connexions. Assurez-vous que le K4 est débranché du
circuit CA et débranchez tous les autres câbles incluant les instruments.
2. Assurez-vous aussi de débrancher le connecteur du haut-parleur, et retirer ensuite le
châssis de l’enceinte.
a) Enlevez les cinq boulons du dessus et desserrer les vis de la plaque d’évent
qui tiennent le châssis à l’enceinte; cela vous permettra de pousser le châssis vers
l’avant d’environ 2 pouces jusqu’à
ce que les connexions du câble de
raccordement pour haut-parleur à
l’arrière gauche soient visibles.
b) Débranchez le connecteur en
prenant note de l’orientation du
joint de verrouillage pour raccorder
correctement le connecteur
une fois les lampes changées.
Continuez ensuite de pousser le
châssis vers l’avant jusqu’à ce
qu’il soit sortie de l’enceinte.
Si en le sortant par l’avant, le châssis se trouve coincé sur le vinyle de l’enceinte,
renversez le processus et poussez-le vers l’arrière de l’enceinte. Vous trouverez peut-
être préférable d’insérer de minces bandes de plastique comme cale entre le châssis
et le cabinet pour réduire les chances d’accrochage.
5. Une fois le châssis enlevé, à l’aide d’un
petit tournevis de type Phillips, enlevez
les 20 vis utilisées pour fixer le couvercle
au châssis. Les lampes sont situées près
du devant du châssis sur le côté gauche
(vue du devant). Elles tiennent en place à
l’aide d’une fixation qui doit être dévissée
et enlevée avant que vous puissiez tirer les
12AX7/7025 de leur douille. Enlevez les
vis des fixations et tirez les fixations vers le
haut. Procédez au remplacement des deux
lampes 12AX7A/7025A.
6. Réinstallez les fixations et le couvercle
du châssis à l’aide des vis fournies.
7. Glissez avec prudence le châssis dans l’enceinte en gardant les fils de haut-parleur
accessibles; n’oubliez pas de reconnecter les fils de haut-parleur avant de glisser l’appareil
jusqu’à sa position finale.
8. Réinstallez les gros boulons et resserrez les vis de la plaque d’évent.
Amp Cover
Lid Screws (20)
Tube retaining bracket
Tube retaining
bracket screws (2)
K4 Amplifier
Tubes
Speaker Connection
Lid and Tube Retaining Bracket

1
SERVICE BULLETIN
January 29, 2009
The K4 is a powerful 300-Watt compact and light-weight combo
amplifier for keyboards. The product houses 5 drivers in it's speak-
er section and a chassis that has 3 amplifiers, a set of tubes, 2
fans (with heat sinks) and 6 circuit boards. All of these compo-
nents potentially rattle and/or buzz at various frequencies. Yorkville
uses a specific method to help prevent the sound energy from
being transferred from to the speaker compartment to the chassis.
Yorkville has taken great care by using dampening foam inside
to help reduce a great deal of rattling. Special foam and rubber
washers are also used for mounting the chassis to the cabinet.
The top 5 chassis mounting bolts are not fully tightened, this helps
prevent the transference of the sound energy to the chassis from
the speakers.
Over tightening the top 5 bolts may result in rattle and buzz!
If chassis is removed and replaced, we recommend using a
Phillips head screw driver and tighten each bolt so that the top of
the head is just above the surface of the cabinet. To test if the
mounting is done correctly, apply a little force to the front and then
the back of the chassis if it moves too much, retighten the bolts
and redo the test again.
K
E
Y
M
A
S
T
E
R
k4k4

Top
Facing Front
Bottom
24-inch Yellow
24-inch White
24-inch Black
15-inch Black
15-inch Black
15-inch Black
15-inch Orange
19-inch Brown
18-inch Red
18-inch White
RT
V
RED
WHITE
RT
V
BLACK WHITE
BROWN
C93 5933
4U7
100V
YELLOW
ORANGE
100V
4U7
#7286
L-TWEETER
#7388
WOOFER
R-MID
#7405
#7286
R-TWEETER
L-MID
#7405
K4 FINISHING Wiring Diagram
FINISHING-K4-speaker-wiring-00-1v1.pdf
#7405 #7405
#7286#7286
#7388
L
E
F
T
T
W
E
E
T
E
R
L
E
F
T
M
I
D
R
I
G
H
T
M
I
D
R
I
G
H
T
T
W
E
E
T
E
R
WOOFER

11 11
10 10
9 9
8 8
7 7
6 6
5 5
4 4
3 3
2 2
1 1
A
A
B
B
C
C
D
D
E
E
F
F
G
G
H
H
I
I
J
J
K
K
L
L
M
M
N
N
O
O
P
P
Q
Q
Product
Date:
Filename:
PCB#
M1238V300sch.sch2002
K4
Wed Feb 20, 2008 M1238 ofSheet
Rev: 41 3V00
Product
Date:
Filename:
PCB#
M1238V300sch.sch2002
K4
Wed Feb 20, 2008 M1238 ofSheet
Rev: 41 3V00
1/4W
10K
R53
.
1/4W
10K
R14
.
1/4W
22K
R57
.
1/4W
22K
R18
.
1/4W
47K
R54
.
1/4W
47K
R15
.
1/4W
2K2
R77
.
1/4W
2K2
R38
.
W37
W35
C20 100V68N
C3 100V68N
R143
1/4W
MINI
1K0
RED
BLACK
R152
1/4W
.
82K5
W1
4.75"
8r 30WPGM
1/4W
MINI
10K0
R160
1/4W
MINI
10K0
R133
1/4W
1M
R69
.
BAV21
D10
C22 100V68N
1/4W
1M
R30
.
BAV21
D4
C5 100V68N
1/4W
MINI
20K0
R162
1/4W
MINI
20K0
R158
1/4W
10K
R72
.
1/4W
1M
R71
.
BAV21
D8
1N5240BRL
D7
0W5
10V0
1/4W
10K
R33
.
1/4W
1M
R32
.
BAV21
D3
1N5240BRL
D1
0W5
10V0
1/4W
2K
R167
.
1/4W
MINI
10K
R165
1/4W
MINI
10K
R164
1/4W
MINI
10K0
R168
1/4W
.
R67
22K
R58
1/4W
.
2K2
TO92
MPSA56
Q14
5104
1/4W
MINI
2K
R183
1/4W
10K
R40
.
1/4W
.
R28
22K
R19
1/4W
.
2K2
MPSA56
Q4
5104
TO92
1/4W
MINI
2K
R182
1/4W
10K
R1
.
1/4W
.
4K3
R170
100P 100V
C87
1/4W
.
4K3
R169
100P 100V
C86
R64
1/4W
.
220R
50VC29
22U
R60
1/4W
.
10K
Q15
5104
TO92
MPSA56
R25
1/4W
.
220R
50VC13
22U
R21
1/4W
.
10K
5104
TO92
MPSA56
Q3
1/4W
4K7
R136
.
4148
D48
U3:B
LM13600N
R41
1/4W
.
10K
U3:A
LM13600N
U3:E
4148
D51
4148
D49
1/4W
3K3
R140
.
R141
1/4W
MINI
20K0
1/4W
100K
R74
.
50VC32
680P
R62
1/4W
.
10K0
50VC24
22U
1/4W
100K
R35
.
50VC15
680P
R23
1/4W
.
10K0
50VC7
22U
1/4W
1K8
R52
.
1/4W
22K
R42
.
1/4W
2K2
R27
.
1/4W
1K8
R13
.
X58
BLACK
W43
BLK
MJF6388
6815
Q35
T221D
RED
1/4W
680R
R50
.
25VC25
68U
1/4W
680R
R11
.
25VC8
68U
1/4W
470K
R154
.
4148
D53
BD139
6774
Q21
TO126
.
1/4W
10K
R51
.
1/4W
15K
R49
.
1/4W
270R
R61
.
BD139
6774
Q10
TO126
.
1/4W
10K
R12
.
1/4W
15K
R10
.
1/4W
270R
R22
.
1/4W
2K49
R153
.
TO92
Q38
5109
MPSA43
NTC
10K
R156:A
6467
R76
1/4W
.
12R
50VC23
100N
R37
1/4W
.
12R
R7
1/4W
.
12R
50VC6
100N
R146
1/4W
.
22K
1/4W
1M
R147
.
R150
1/4W
.
1K3
1/2W
22R
R75
.
5.0W
0R27
R70
.
5.0W
0R27
R55
.
1/2W
22R
R36
.
5.0W
0R27
R31
.
WHT
W3
SPKR/L-MID
5.0W
0R27
R16
.
R151
1/4W
.
82K5
5" 8R
30WPGM
+MID
SP4
W4
4.75"
8r 30WPGM
5" 8R
30WPGM
+MID
SP2
W30
AG
BLK
1/4W
MINI
10K0
R161
1/4W
MINI
10K0
R157
1/4W
10K
R43
.
1/4W
10K
R4
.
BAV21
D9
BAV21
D2
4V+ 11
V-
U1:E
1/4W
2K
R166
.
1/4W
1K
R65
.
1/4W
MINI
10K0
R171
1/4W
1K
R26
.
4V+ 11
V-
U7:E
NTC
10K
R134:A
6467
R2
1/4W
.
10K
4148
D50
1/4W
10K0
R139
MINI
1/4W
2K2
R66
.
BC560C
Q17
5102
TO92
1/4W
22K
R3
.
BC560C
Q6
5102
TO92
1/4W
3K3
R5
.
R6
1/4W
.
3K3
1/4W
3K3
R44
.
R45
1/4W
.
3K3
1/4W
47R
R78
.
1/4W
47K
R155
.
FAN2 1/4W
47R
R39
.
50VC1
1N
50VC18
1N
50VC34
1N
R46
1/4W
.
12R
50VC17
1N
250V
C33
10N
4148
D52
W6BRN
SPKR/ R-MID
250V
10N
C16
R149
1/4W
.
10K
SP1
HORN
7286
C19 100V68N
D5
4148
C2 100V68N
C74 100V47P
R29
1/4W
.
33K
R17
1/4W
.
10K
1
W51:A 2
2
W49:B 2
TP4
C27 100V10P
TP3
TP1
100P 100V
C80
1/4W
MINI
20K0
R163
C82
63V 4U7
100P 100V
C79
1/4W
MINI
20K0
R159
C81
63V 4U7
U8:A
TL072
16VC28
10U
1N5240BRL
D12
0W5
10V0
D11
4148
R59
1/4W
.
4K7
1/4W
10K
R48
.
C21 50V68N 1/4W
.
1K
R184
TO92
MPSA43
Q8
5109 16VC11
10U
1N5240BRL
D6
0W5
10V0
R20
1/4W
.
4K7
1/4W
10K
R9
.
C4 100V68N 1/4W
.
1K
R181
U2:B
NE5532N
1/4W
20K
R137
.63VC73
2U2
8
V+
4V-
U2:C
U2:A
NE5532N
R68
1/4W
.
33K
R73
1/4W
.
220R TO92
Q20
5119
2N5638
R47
1/4W
.
22M
R56
1/4W
.
10K
TO92
BC560C
Q16
5102
R34
1/4W
.
220R TO92
Q9
5119
2N5638
R8
1/4W
.
22M
2
W51:B 2
1
W49:A 2
R144
1/4W
FLMP
11R3
C85 160V10U
63VC31
4U7 100V
C30
15P
R63
1/4W
.
47K
TO92
Q13
5101
BC550C
CUT OUT R49, R51
UNTIL 2 TO 4 mV
IS ACROSS TP3 AND
TP4 WITH AMP COLD
63VC14
4U7 100V
C12
15P
TP2
R24
1/4W
.
47K
TO92
BC550C
Q2
5101
1/4W
100K
R148
.
Q36
5104
TO92
MPSA56
100V
C91
4U7
TO92
Q18
5104
MPSA56
TO92
MPSA43
Q19
5109
U8:B
TL072
8
V+
4V-
U8:C
M
LIN
P2:A
4032
10K
CH-4 GAIN
TO92
MPSA56
5104
Q7
U1:A
MC33079P
U7:C
MC33079P
1/4W
470K
R138
.
R142
1/4W
.
390K
NTC
10K
R135:A
6467
U1:C
MC33079P
(VCC)LM13600N
Dual VCA
6745
U3:D
TO92
BC560C
Q5
5102
U7:B
MC33079P
(VCC)LM13600N
Dual VCA
6745
U3:C
R145
1/4W
FLMP
11R3
TO92
Q39
5102
BC560C
TIP147
Q22
TO218
6903
FAN1
CUT OUT R10 , R12
UNTIL 2 TO 4 mV
IS ACROSS TP1 AND
TP2 WITH AMP COLD
C10 100V10P
TIP147
Q11
TO218
6903
TIP142
Q1
TO218
6902
TIP142
Q12
TO218
6902
Q37
MPSA43
TO92
5109
1
4
W47:A
100V
C904U7
SP3
HORN
7286
4
4
W47:D
M
LIN
P2:B
4032
10K
CH-4 GAIN
GND=GROUND
AG=AMP GROUND
SG=SIGNAL GROUND
U7:A
MC33079P
S TR
-
--
J1
LEFT
U1:B
MC33079P
S TR
-
--
J2
RIGHT
U1:D
MC33079P
U7:D
MC33079P

11 11
10 10
9 9
8 8
7 7
6 6
5 5
4 4
3 3
2 2
1 1
A
A
B
B
C
C
D
D
E
E
F
F
G
G
H
H
I
I
J
J
K
K
L
L
M
M
N
N
O
O
P
P
Q
Q
Product
Date:
Filename:
PCB#
M1238V300sch.sch2002
K4
Wed Feb 20, 2008 M1238 ofSheet
Rev: 42 3V00
Product
Date:
Filename:
PCB#
M1238V300sch.sch2002
K4
Wed Feb 20, 2008 M1238 ofSheet
Rev: 42 3V00
4148
D27
0A45
1/4W
4R7
R97
.
1/4W
18R
R96
.
1.0W
4K7
R84
.
4148
D55
4148
D54
1/4W
1K
R99
.
3
W34:C 4
CURRENT LIMIT
R98
1/4W
.
68R
TP6
TP5
3W47:C4
W41
RED
4
W34:D 4
2
W34:B 4
R94
1/4W
.
10K
1/4W
2K
R172
.
1/4W
.
2KR88
1/4W
2K
R89
.
IN FROM M1239
PRE-AMP
4148
D28
0A45
D31
0A454148
4148
D18
1/4W
2K
R106
.
4148
D16
1/4W
.
249R
R177
1/4W
.
249R
R176
D23
0A2BAT85
D22
0A2 BAT85
1/4W
10K
R105
.
C37 100V100P
R93
1/4W
.
10K
1/4W
.
4K99
R175
1/4W
.
4K99
R178
R125
1/4W
.
270K
R113
1/4W
.
270K
R91
1/4W
.
2K05
4
6
5
4N35 U13:B
6880
1/4W
75R
R104
.
M
Lin
4529
470R
P1
.
Q40
5102
BC560C
TO92
1/4W
4R7
R102
.
Q26
5101
BC550C
TO92
C77
63V
1U
Q34
5102
BC560C
TO92
Q23
5101
BC550C
TO92
TO92
BC560C
Q42
5102
R190
1/4W
.
47K
4148
D19
BD237
6787
Q27
TO126
.
R201
1/4W
.
100R
R199
1/4W
.
100R
1.0W
4K7
R111
.
5.0W
0R18
R95
.
R204
1/4W
.
100K
R207
1/4W
.
22M
R208
1/4W
.
15K
R203
1/4W
.
200K
R194
1/4W
.
22M
R193
1/4W
.
15K
5.0W
1K
R112
.
1N4745A
D20
1W0
16V0
1N4745A
D17
1W0
16V0
5.0W
1K
R85
.
1/4W
49K9
R205
.
R206
1/4W
.
47K
8V+ 4
V-
U14:C
R110
1/2W
.
150R
R114
1/2W
.
150R
50VC36
68N
R83
1/2W
.
150R
W40
WHT
8V+ 4
V-
U6:C
1
W34:A 4
C41 50V470N
D26
0A454148
R116
1/4W
.
47K
U6:B
NE5532N
U4:A
TL072
8
V+
4V-
U4:C R117
1/4W
.
22K
R108
1/4W
.
4K12
R87
1/4W
.
2K87
R187
1/4W
.
470R
R186
1/4W
.
220K
1/4W
4K12
R119
.
Q32
5102
BC560C
TO92
1/4W
4K12
R80
.
R189
1/4W
.
20K
1/4W
150R
R120
.
1/4W
150R
R81
.
BD238
6788
Q33
TO126
.
R202
1/4W
.
100R
R200
1/4W
.
100R
5.0W
0R18
R101
.
U15:E
R86
1/2W
.
150R
R109
1/2W
.
150R
50V
68N
C44
R82
1/2W
.
150R
2W10:B4
R191
1/4W
.
100K
LIMITER DRIVE
R124
1/4W
.
47K
C42 100V27P
X77
R92
1/4W
.
10K0
63V
C40 1U
4W10:D4
3W10:C4
1W10:A4
1/4W
.
4K99
R174
U12:A
TL072
1/4W
.
4K99
R173 1/4W
MINI
10K0
R179
RED
LD1
6405
.
1N5225B3V0
D56 0W5
C45 50V5N6
4148
D24
R103
1/4W
.
47R
D21
0A2 BAT85
R90
1/4W
.
47R
C39 50V680P
D15
0A2BAT85
Q25
5101
BC550C
TO92
C35 50V12N
(VCC)LM13600N
Dual VCA
6745
U15:D
{Function}
1/4W
3K
R185
.
1/4W
470R
R188
.TO92
BC550C
Q41
5101
400V
C26
1N
POWER AMPLIFIER
4007
D25
63VC43
470U
TO3
6910
Q30
MJ21195
63VC38
470U
R198
1/4W
.
33K
R195
1/4W
.
33K U14:B
MC33078P
R192
1/4W
.
47K
12" 2R 170WPGM
WOOFER
SP5
7388
2
4
W47:B
R107
1/4W
.
12K1
TO92
Q29
5119
2N5638
R100
1/4W
MINI
10K0
1/4W
.
10K0
R180
8V+ 4
V-
U12:C U12:B
TL072
RED
LD2
6405
.
1/4W
10K0
R118
.
Q31
5102
BC560C
TO92
U4:B
TL072
1
2
4N35
U13:A
6880
1/4W
10K0
R79
.4148
D13
(VCC)LM13600N
Dual VCA
6745
U15:C
{Function}
WITH AMP COLD
ADJUST P1 FOR
2 mV ACROSS TP5
AND TP6
MJ21196
6909
TO3
Q28
W8
{Function}
{AWG}
RED
R197
1/4W
.
33K
R196
1/4W
.
33K
4007
D14
U14:A
MC33078P
LM13600N
U15:A
LM13600N
U15:B
WARNING: 120 VDC IS BETWEEN C55 TO GROUND.THIS PRESENT A SIGNIFICANT SCHOCK HAZARD. PLEASE, USE EXTREME CAUTION WHEN SERVICING!
TO92
Q24
5122
J109
U6:A
NE5532N
S TR
-
--
J3
SUB-OUT

11 11
10 10
9 9
8 8
7 7
6 6
5 5
4 4
3 3
2 2
1 1
A
A
B
B
C
C
D
D
E
E
F
F
G
G
H
H
I
I
J
J
K
K
L
L
M
M
N
N
O
O
P
P
Q
Q
Product
Date:
Filename:
PCB#
M1238V300sch.sch2002
K4
Wed Feb 20, 2008 M1238 ofSheet
Rev: 43 3V00
Product
Date:
Filename:
PCB#
M1238V300sch.sch2002
K4
Wed Feb 20, 2008 M1238 ofSheet
Rev: 43 3V00
F2
FUSE
4 3
BLU .W22
W7
2
S4
1
BRN .
50Hz
D45
6A2
4007
D35 4007
D34
GRN/YELL
BLUE
250V
4N7
50V
22N 230/240VAC
XF1_
CH1339E
240VAC
BRN/BLK
6A2
D43
D46
6A2
D42
6A2
3
W2:C 4 2W5:B4
BROWN
W20
CHASSIS GND
.
GRN
F1
3414
FUSEHOLDER
W14
SW
.BLK
C64
W21
SW-WHT
W22
XFMR-BLK
W17
SW .
BLK
C61
W18
W50_BLU
TUBE AG2
D44
6A2
6A2
D41
6A2
D40
63VC9
1U
5 AMP SB
F3
FUSEHOLDER
5 AMP SB
F2
FUSEHOLDER
1/4W
2K2
R130
.
FAN-AG
W43_
BLK BLK
W9
SPKR/AG
R131
1/2W
.
22R
63VC66
100N
R129
1.0W
FLMP
1R
50VC53
33P
IN
REF
OUT
MC7815CT
6872
U10
63VC72
100N
63VC70
100N
63VC54
1U
R127
1.0W
FLMP
1R W12
WHT
63VC84
100N
63VC89
100N
1
W2:A 4
2
W2:B 4
4
W2:D 4
63VC76
100N
4W5:D4
3W5:C4
1W5:A4
W19
AC-BLK
IEC_RECT
275V
C6122N
7
6
1
2
3
4
5
T1
4007
D39
6A2
D47
W13
TUBE/AG1
BLK
1/4W
5K6
R126
.
63VC49
1U
63VC48
1U
BC
TO-92
MPSA63
MPSA43
2N5551
E
MPSA56
MPSA06
MPSA13
2N5401
BD139
BD237
BD238
MJE340
MJE350
MJE271
MJE270
BD140
ECB
160V
C58
220U
TUBE AG2
W50 BLU
SG
TO-92
2N5638
D
J109
BE
TO-92
BC560C
C
BC550C
6840_PC
63VC65
100N
R132
1.0W
FLMP
1R
63VC69
100N
W29
WHT
-29VDC
63VC83
100N
63VC88
100N
IN
REF
OUT
MC7915CT
6871
U11
IN
REF
OUT
MC7815CT
6872
U9
63VC75
100N
SCH_DPDT
{Value}
W28_ BRN
4148
D36
EUROPEAN POWER SUPPLY
C64 250V4N7
W27
GRY
W26
RED
S1
DPDT Switch
W24
RED
W23
GRY
W18
XFMR-BLK
4007
D38
50VC62
3300U
50VC63
3300U
W29_ WHT
50VC59
3300U
R128
1/4W
.
1M
160V
C55
220U
4007
D37
C52 160V220U W11
TUBE120VDC
RED
63VC68
100N
63VC47
100N
63VC57
1U
50VC56
33P
63VC51
1U
50VC50
33P
+29VDC
W28
BRN
W25
XFMR
YEL
D33
0W5
22V0
1N5251BRL
50VC60
3300U
6882_PC 6884_PC
63VC67
100N
63VC71
100N
63VC46
100N
6745_PC
CSA-5 A / 120 V
CE-T3.15 A / 230V
6804_PC
REF KNOBPART#
MODEL(S):-
FUNCTION
R
R
R
R
R
R
R
R
R
R
R
P2
F
F
F
F
F
F
F
F
F
F
F
CH-4 GAIN
K
K
K
K
K
K
K
K
K
K
K
9922
P
P
P
P
P
P
P
P
P
P
P
4032
POT LIST
N
N
N
N
N
N
N
N
N
N
N
{NEW}
N
K4
13
10
7
4
1
9
11
12
8
#
2
3
5
6
VER#
MODEL(S):-
DATE DESCRIPTION OF CHANGE
V
V
.
3.00
1.00
V
V
.
.
.
.
.
2.00
D
D
.
13-FEB-2008
08-FEB-2007
N
N
NODE N122 DELETED.
PC#7291,REPLACE FAN EYELETS WITH MOLEX.
FIRST PROTO
K4
D
D
.
.
.
.
.
08-MAR-2007
N
N
PC#7592, NEW #6787 & #6788 NEED NO THERMO PAD
FORCE UPDATED
PC#7437,REDUCE HUM,ISOLATE AC SECTION.
PC#7277,VALUE CHANGE PRIME CE F1 TO T3.15A #2475.
PC#7281,CHANGE W3,W6,W8 & W9 TO NORMAL EYELET
REPLACE OPTOCOUPLER
M1238 DATABASE HISTORY

VCD
CLINCH
ORIGIN LONG AXIS
SHORT AXIS
INSERT
ORIGIN
Pcb Mech 3V00M1238
BlankSize - 17000x11000
TAB
NORMAL
SOCKET
SOCKET WITH DIRECTION
NORMAL LARGE
SOCKET UPSIDE DOWN
Top Assy 3V00
8829 SCREW
TOOLING PIN 8829 SCREW TOOLING PIN
M1238
SEE LAYOUT DOCUMENTATION
RT
V
V
T
R
V
T
R
RT
V
V
T
R
V
T
R
V
T
R
V
T
R
V
T
R
V
T
R
V
T
R
V
T
R
V
T
R
GUIDE
ETCH
231 4
V
T
R
V
T
R
V
T
R
V
T
R
RT
V
GUIDE
ETCH
V
T
R
V
T
R
BAR DOWN
RT
VRT
V
E B
C
E B
C
BAR DOWN
BAR DOWN
BAR DOWN
V
T
R
7
RT
V
21
RB
21
RB
GUIDE
ETCH
BAR DOWN
231 4
E B
C
1 2 3 4
PCBCONN 4 CIR BOTTOM .156
E B
C
BAR DOWN
BAR DOWN
V
T
R
BAR DOWN
7 7
1 2 3 4
PCBCONN 4 CIR BOTTOM .156
.
.
.
FUNCTION
RIGHT
CH-4 GAIN
SUB-OUT LEFT
5834
3654
5101
3538
6467
6435
64056405
6434
6815
6871
4729
6774
4729
6467
5101
5834
4729 4729
6788
6434
4719 4726
6434
6434
4529
3414
4726 4719
3498
4056
4056
3672
4040
3672 4040
6434
6467
6451
3602
3654
6872
6872
6903 6902 6902 6903
6787
6909
3903
6774
6880
6910
6434
6434
6434
4032
3498 3498
3903
3414
3414
4K99
10K 4K3
10K 68N
2K2
4148
10K 220R
10K
10K
10K 68N 10K0
220R
3K3
2K2 20K0
1K0
4148
20K
10V0
10V0
22K
47K
47R 12N
4148
68R
470N 270K
47K
75R
10K
2K87
4K12
12K1
150R
47K
49K9
100K 100N
4148 15K 2K49
82K5
10K
249R
10K 249R
33K 68N
2K2
220R
4K3
10K 22V0
5K6
100P
20K0
10K
68N
22M 20K0
10K 4148
390K
22K
10U
16V
10K0
4007
100P
2K
47K
10K 1R
1.0W
4148
MPSA56
4148
10V0 11R3
22K
12RBAV21
1M
10K0
10K
10N
47R 680P
270R 680R
2K2 10P
15K 10K
1K8 100N 3K3 2K2
3K3
1N 1K8
12R 10K
4U7
63V
100K 270R
22R
1/2W 47R
1N
10V0
22K 22K 1M
4007 150R
BAT85
10K0
4007
4148
47R
1/2W
150R
4148 4R7
270K
16V0
10K
2K 100N
10K0
5N6
4K12
68N
100R
100K
10K0
1/2W
150R
200K 82K5
47K
33K
1K3
100K
22K
100N
2K
100N
1U
3V0
4148
470R
BC560C
1N
1U
63V
10K0
68N
1U
63V
100N
100N
2K
1M
4K7
22K
22M
1K
47K
MPSA56
10K0
68N
100N
MC33079P
100P
100N
100N
10K0
TL072
10K0
68N
10K
4CIR
MPSA56
50V
22U
10K
2U2
63V
4148
20K0
33K
100N
BAV21
MPSA43
4K7
4148
BAV21
BAV21
BC550C
BC560C
10P
68U
25V
2N5638
BAV21
MPSA43
10K
BC550C BC550C 22N
275V
REDRED
4148
10K0
2K05
NE5532N
10K
100P
4148
47K
100N
4R7
6A2
MC33078P
33K
33K
4148
27P
100N
J109
BC560C BC560C
BC560C
47K
MPSA56
22M
100R 470K
4K99
220R
100N
MC33079P
2K
100P
4007
1K
MPSA56
4K99
4K99
10K0
10K
1U
33P
10K0
68N
4007
33P
220U
160V
10K0
10K0
TL072
20K0
47P
NE5532N
4K7
470K
1M
MPSA56
{Watts}
MJF6388
T221D
TO220
{Watts}
MC7915CT
33P
1.0W
1R
1K
1K
MPSA56
1M
11R3
22U
50V
5.0W
0R27
1N
TO126
BD139
2N5638
5.0W
0R27
3K3
4U7
63V
2K2
15P
10K
BC550C
3K3
100K
47K
BC560C
12R
BAV21
1N
100N
10N
680P
680R
15K
2K2
15P
0R27
5.0W
12R
22U
50V
5.0W
0R27
4007
BD238
TO126
6A2
16V0
5.0W
0R18
5.0W
1K
4007
6A2
6A2
4148
18R
4K12
1K
4148
BAT85 BAT85
4148
BAT85
68N
150R
1/2W 1/2W
150R
470R
2K
TL072
50V
3300U
680P
50V
3300U
5.0W
1K
5.0W
0R18
100R
BC550C
150R
1/2W
4148 1/2W
150R
MPSA43
100R
33K
22K
MPSA43
1M
LM13600N
10K
100N
2K
2K
1U
3K
470R
20K
22M
220U
160V
220U
160V
10K 1U
10U
16V
50V
22U 10U
160V
4U7
63V
4U7
63V
BC560C
68U
25V
6A2
4148
220K
2N5638
1U
10K
1U
100N
4K7
1.0W
1.0W
4K7
250V
4N7
47K
15K
BC560C
1R
1.0W
10K
Yellow
4CIR
{Watts}
MC7815CT
TO220
TO220
{Watts}
MC7815CT
100V
4U7
BC560C
TO218
TIP147
TO218
TIP142
TO218
TIP142
TO218
TIP147
BD237
TO126
MJ21196
Body
22R
1/2W
100V
4U7
BD139
TO126
100N
50V
3300U
4N35
MJ21195
Body
3300U
50V 6A2
6A2
BC560C
BC550C
63V
470U 63V
470U
LM13600N
6A2
LIN
10K
22R
1/2W
-15
SG -15
+15
4/5
2/5
K4
R
L
SG
+15
L
K4
K4
M1238
3V00
PRE-AMP
1/5
M1238
AG
SG
3V00
M1238
K4
K4 5/5
3V00
AG
R
3V00
M1238
LOW
SIG
M1238
3V00
3/5
SET P1 FOR 2 mV
BETWEEN TP5
AND TP6
WARNING!
120V DC IS
BETWEEN
C55 TO
GROUND
R178
R21 R170
X46 X75
R53
C19
X60
X48
R130
D36
R14 X38
X37 R73
R60
R41
R48
C20
R157
R64
R140
R58 R162
X40 R143
X74 X33
D49
R137
D1 D7
X42
R3
X1
X10
R24
X11
R90
X59
C35
D31 R98
C41 R125
R124
R104
X78
R93
R87
R108
R107
R120
R206 X32
R205
X65
X66
R191
C47
X82
D54
R193 R153
R151 R149
R176
R17 X57 R177
R29 C21R19
R34
R169R2 D33 R126
C79
R159
R4
C5
X50
R47
R158
R1
D50
R142
R67
C28
R139
D35
C80
R183
R54
R33
R127
D5
Q14
X35 D11
D6 R145
R18
R7D2
R30
R62
R72
C33
R39 C32
R22 R11
R38 C27
R10 R12
X9
R13 C6 R44 R66
R5
C17
X8
R52
R37 R51
C31
R35 R61
R36 X21 R78
C18 D12
R57 R42 R69
D14 R81 D15
X13
R79
D25
X6 D19
R103
R82
X19
D26
R97
X20 X17 R113
D20
R105
R106
C65
R92
C45
R119
C44
R202
R204
R118
R110
R203 R152
R155
R195
R150
R148
R117
C67
X70 X49
R182
X47
X52
X44
X58
C83
C51
TP4
X27
X26
X28
X77
X69
D56
D16
TP6
R187
Q40
X79
X80
X83
C26
C77
X34
R168
C4
C49
C72C71
R89
R128
R20
R28
R8
R181
R15
Q4
R171
C22
C68
U1
C87
X61
X63
C89
C88
R180
U12
R179
C2
X45
R9
W34
X39
W50
BLU
TUBE AG2
X23
Q15
C29
R56
X62
C73
X15
D51
R141
R68
C69
D3
Q8
W28
+29VDC
BRN
X41
R136
D48
W39 +29VRED
D4
D8
W6
BRN
SPKR/ R-MID
X4
Q13
Q17
W4
R-TWEETER
ORN
C10
C8
X22
X12
Q9
X25
D10
Q19
W47
W23
GRY
R134
X29
W27
GRY
Q25 Q26
C61
W25
XFMR
YEL
LD1LD2
D28
TP5
W39_
RED
R100
R91
U6
R94
C37
X56
D18
R116
C75
R102
X71
X76
W24
RED
D42
U14
R197
R198
D55
C42
X64
C46
Q24
X14
Q32
Q31
CAUTION!
Replace with same
type and value fuse.
5-AMP SB
Q42
R192
Q36
R194
R199
W38
BLK
-15V
R154
R173
R25
C66
U7
R88
C86
D34
R26
Q3
R174
R175
R133
R43
C57
C56
R23
C3
D37
X68
C53
C52
R161
R160
U8
R163
C74
U2
R59
R138
R32
Q7
Q35
U11
C50 X36
R129
R184
R65
Q18
R71
R144
C7
R16
C1
TP1
Q10
Q20
R70
W41
WOOFER
RED
W30
AG
BLK
R6
C14
R27 C12
R135
Q2
X2
X3
R45
R74
R63
Q16
R76
D9
C34
C23
W37
R-MID
BRN
X43
C16
C15
X5
TP2
R50
X7
R49
R77
C30
R31
LOC
BEC
R46 X24
C24
R55
D38
Q33
D40
D17
R95
R85
D39
D47
D43
D13 R96
R80
R99
W17 BLK-SW
W18 XFMR-BLK
W21SW-WHT
W22
XFMR-BLK
D27
D23
X16
D22
W9
SPKR/AG
BLK
D24 D21
C36
CAUTION! Replace with same type and value fuse. CSA-5 AMP
CE-T3.15 A / 230V
X72
X73
R86 R83
W19
AC-BLK
P1
F1
R172
U4
C63
X30 C39
W29_
-29VDC
WHT
C60
R112
R101
R201
Q41
R109
D53 R114
Q38
R200
R196
R146
Q37
R147
U3
J2
-
-
-
X31
X54
X55
X53 X84
R40
C84
R167
R166
C9
X67
R185
X81
R188
R189
R207
C58C55
R165 C54
C11
C13
C85
W51 W49
W44
W16
W43
BLK
W42
W1
L-TWEETER
YEL
W15
X51
C81
C82
X18
Q6
W3
SPKR/L-MID
WHT
C25
W13
TUBE/AG1
BLK
W26
RED
D46
D52
R186
W28_
BRN+29VDC
W43_
BLKFAN-AG
Q29
C48
R156
C40
C76
R111
R84
W8
RED
SPKR/WOOFER
C64
R190
R208
Q39
R132
R164
W12
+15V TUBE
WHT
W10
W11
TUBE120VDC
RED
U10
U9
W48_
.
GRN
W38_
BLK-15V W29
WHT
-29VDC
C90
W35
L-MID
WHT
W48
.
GRN
Q5
Q11
Q12
Q1
Q22
Q27
Q28
R75
C91
TP3
W40
WOOFER
WHT
W2
Q21
C70
C59
U13
Q30
C62
W50_
BLU
TUBE AG2
D45
D44
Q34
Q23
C38 C43
W7 DUMMY
W14
SWBLK
W20
CHASSIS GND
GRN
CAUTION!
Replace with same
type and value fuse.
5 AMP SB
U15
D41
P2
J3
-
-
-
J1
-
-
-
W5
F2
R131
F3

SEE LAYOUT DIAGRAM
PRODUCTION NOTES K4 M1238
1--ADD THERMAL JOINT COMPOUND (GOOP) BETWEEN Q25 AND Q26;
Q31 AND Q32 . COVER WITH VINYL CAP (8609) AND RTV.
2--ADD RTV TO ALL CAP'S.
3--Q2 , Q13 , R134 , R135 , R156 ARE HAND INSERTED.
4--C90 AND C91 RTV AND BEND FLAT
5--CHECK THE PICTURE FOR MOUNTING THE TO-220 AND TO-218.
6--Q23 & Q33 ( #6787 & #6788 ) DON'T NEED ANY THERMO PAD OR SILICON
JUST PUT SOME THERMO CONDUCTIVE COMPOUND (WHITE GREASE)
PCB
Sil pad
8833 screw
Inner heatsink
Outer heatsink
8581
TO220 parts
8841
3977 - Yellow spring
8833 screw
Inner heatsink
8581
Outer heatsink
TO218 parts
Sil pad
8841
PCB
3719 - Spring

NE5532N MC33079P
TLO72
LM13600N
MC33078P
PIN CONFIGURATION
SEE LAYOUT DIAGRAM
BD139
BD237
BD238
MJE340
MJE350
MJE271
MJE270
BD140
EBC
DGS
TO-92
2N5638
J109
CEB
TO-92
BC560C
BC550C
6
4
2
+V
1
-V
4
9
11
13
7
5
3
1
2 3
8
10
12
14
FUNCTION KNOBREF
MODEL(S):- PART#
P2 CH-4 GAIN 4032 9922
POT LIST
K4
4
2
-V
A
5
7
3
1
B
+V
6
8
4
2
-V
A
5
7
3
1
B
+V
6
8
5
2
#
6
3
4
1DATE
MODEL(S):- VER# DESCRIPTION OF CHANGE
D
D
V
V
N
N
D
D
D
V
V
V
N
N
N
K4 M1238 DRILL HISTORY
UPDATED PER PC#7291, 7277, 7437.3.0013-FEB-2008
ECB
TO-92
MPSA63
MPSA43
MPSA13
2N5551
MPSA56
MPSA06
2N5401
12
9
6
3
#
13
11
10
5
4
8
7
2
1DATE
MODEL(S):- VER# DESCRIPTION OF CHANGE
D
.
.
V
.
.
N
PC#7437,REDUCE HUM,ISOLATE AC SECTION.
PC#7281,CHANGE W3,W6,W8 & W9 TO NORMAL EYELET
D
D
D
.
.
.
08-FEB-2007
08-MAR-2007
V
V
V
.
.
.
1.00
2.00
N
N
N
PC#7277,VALUE CHANGE PRIME CE F1 TO T3.15A #2475.
PC#7291,REPLACE FAN EYELETS WITH MOLEX.
NODE N122 DELETED.
FORCE UPDATED
REPLACE OPTOCOUPLER
FIRST PROTO
M1238 DATABASE HISTORY
K4
3.0013-FEB-2008
. . PC#7592, NEW #6787 & #6788 NEED NO THERMO PAD
4
2
-V
A
5
7
3
1
B
+V
6
8
16 14 12 10
1 3 5 7
V-
91315 11
24 6 8

11 11
10 10
9 9
8 8
7 7
6 6
5 5
4 4
3 3
2 2
1 1
A
A
B
B
C
C
D
D
E
E
F
F
G
G
H
H
I
I
J
J
K
K
L
L
M
M
N
N
O
O
P
P
Q
Q
of
Filename:
PCB# Sheet 31
Product
Date: Rev: YsType:CSA#
M1239V101_sch.sch2002
M1239
CH-1 INPUT-1
Thu Mar 06, 2008 V1.01
K4
of
Filename:
PCB# Sheet 31
Product
Date: Rev: YsType:CSA#
M1239V101_sch.sch2002
M1239
CH-1 INPUT-1
Thu Mar 06, 2008 V1.01
K4
4148
D8
R73
1/4W
51K
.
R72
1/4W
51K
.
4148
D13
R74
1/4W
1M
.
4148
D1 W3
RED
1/4W
1M
R31
.
1/4W
33K
R19
.
1/4W
4K99
R172
.R58
1/4W
20K0
MINI
W24:C 4
W24:A 4
W29:C
4
W29:A
4
IN FROM
POWER BOARD
W9:C 4
W9:A 4
C47
100V220P
R2
1/4W
.
10K
W10:C
4
W10:A
4
C3
100V220P
D6
4148
W23:G
8
W23:E
8
W23:B
8
C186
250V4N7
X136
C36
50V680P
4148
D5
C95
63V330N
C93
63V 4U7
C97
63V470N
R128
1/4W
.
3K
C92
63V 4U7
C96
100V10N
R240
1/4W
MINI
1K
C89
63V 4U7
W24:D 4
W24:B 4
W29:D
4
W29:B
4
R66
1/4W
100K
.
C49
160V
10U
R67
1/4W
17K8
.
R68
1/4W
14K0
.
C46
63V 10U
R64
1/4W
20K
.
C167
275V22N
R300
1.0W
.
1K8
W4
GRN
CHANNEL-1 INPUT -1
W9:B 4
W9:D 4
D
05C R/A
P4:A
4482
20K
OVERDRIVE
R70
1/4W
1K5
.
Q3
5108
TO92
2N5401
R65
1/4W
.
4K99
C45
63V 330N
R4
1/4W
.
10K
R3
1/4W
.
10K
R1
1/4W
.
10K
W10:B
4
W10:D
4
1/4W
4K99
R113
.
D14
4148
R171
1/4W
.
3K
R60
1/4W
.
220R
R8
1/4W
MINI
20K0
R7
1/4W
MINI
20K0
W2
BLK
R53
1/4W
2K21
.
C33
50V
22U
R46
1/4W
113K
.
8V+ 4
V-
U13:C
4148
D11
4148
D12
C196
100V220P
R122
1/4W
MINI
10K0
R199
1/4W
.
1K
R322
1/4W
10K
.
4148
D2
W23:H
8
W23:F
8
W23:C
8
W23:A
8
W23:D
8
W1
WHT
C35
63V220N
R47
1/4W
.
49K9
C127
63V 10U
C197
100V220P
U25:B
NE5532N
R304
1/4W
MINI
10K0
R17
1/4W
.
100K
R54
1/4W
.
10K
R50
1/4W
.
3K3
R48
1/4W
.
3K3
R44
1/4W
.
4K7
1/4W
1M
R25
.
C41
63V
470N
C39
50V33N
R51
1/4W
.
3K3
R49
1/4W
.
3K3
R56
1/4W
.
100K
R45
1/4W
.
4K7
1/4W
100K
R29
.
I/P SELECTOR
S1:A
3425
4148
D7
U6:A
MC33078P
8V+ 4
V-
U6:C
1/4W
1K
R21
MINI
LD1
RED
6405
R135
1/4W
.
10K
C86
63V470N
R121
1/4W
2K2
.
R111
1/4W
.
3K
C82
100V39N
R110
1/4W
.
3K
R129
1/4W
10K
.
U2:A
MC33079P
11
V-
4
V+
U2:E
C84
400V1N
R115
1/4W
.
2K
R114
1/4W
.
10K
R138
1/4W
.
2K
C102
250V
4N7
R137
1/4W
.
2K
C101
400V1N
R123
1/4W
.
10K
C87
63V 2U2
D16
4007
D17
4007
R170
1/4W
1K5
.
R258
1/4W
MINI
1K
C100
100V100N
C99
200V2N2
R131
1/4W
.
2K
R132
1/4W
5K1
.
R124
1/4W
.
10K
R175
1/4W
100K
.
Q6
5102
TO92
BC560C
R241
1/4W
MINI
2K
C91
63V 4U7
R167
1/4W
100K
.
LIVE
R166
1/4W
100K
.
3425
S4:B
LEAD
R169
1/4W
100K
MINI
R239
1/4W
100K
.
C48
63V1U
8
V+
4V-
U12:C
R61
1/4W
.
220R
R71
1/4W
20K0
MINI
C50
160V
10U
R69
1/4W
.
1K
R296
1/4W
.
2K
100V
C1
220P
100V
C2
220P
8V+ 4
V-
U25:C
R63
1/4W
.
10K
C53
100V22N
6
14
7
13
8
N
P
U7:B
MC14007
4
V+
11
V-
U1:E
V1:A
2X_TRIODE_HCT
Val
R130
1/4W
MINI
4K99
R36
1/4W
.
1K
R52
1/4W
33K
.
R133
1/4W
.
1K
50V
C23
22U
160V
C15
10U
1/4W
113K
R23
.
R57
1/4W
.
2K
R319
1/4W
220R
.
R164
1/4W
.
1M
4477
P1:A
D
B LIN
100K
GAIN
R112
1/4W
.
3K
C83
100V
100N
C85
250V
4N7
R118
1/4W
.
2K
U2:C
MC33079P
TO92
MPSA06
Q7
5103
D15
1N5225B
0W5
3V0
R177
1/4W
100K
.
R120
1/4W
20K
.
U3:B
MC33079P
C90
63V 4U7
R168
1/4W
100K
.
S3:A
3393
W22:G 8
W22:D 8
RIBBON CABLE W22:B 8
RIBBON CABLE
R202
1/2W
.
18R
C200
100V220P
PIANO
W25:B
4
W25:C
4
W25:A
4
W25:D
4W22:H 8
W22:E 8
W22:C 8
W22:F 8
W22:A 8
V1:C
100V
C51
100N
C32
100V22N
C52
160V 10U
Q2
5107
TO92
2N5551
R298
1/4W
.
4K99
U13:A
MC33078P
R201
1/4W
.
4K99
11
12
9
10
P
N
U7:C
MC14007
C126
63V4U7
C44
63V 330N
1/4W
10K0
R62
.
R198
1/4W
.
1K
C4
100V220P
R35
1/4W
.
3K
1/4W
.
1K
R321
R55
1/4W
10K
.
C37
50V680P
C54
63V470N
4478
P3:A
D
50K
B LIN
TREBLE
C34
50V
33N
R313
1/4W
20K
.
4478
P2:A
D
50K
B LIN
MID
C21
63V 2U2
C10
50V33N
C204
63V4U7
D
4478
P5:A50K
B LIN
BASS
50V
C19
680P
C17
50V22N 100V22N
C124
V1:B
2X_TRIODE_HCT
Val
C9
50V100N
Q1
5106
TO92
MPSA63
R27
1/4W
.
10K0
R178
1/4W
.
4M7
R176
1/4W
.
100K
R174
1/4W
1K8
.
Copper Tie-net Name
Tie Here
R134
1/4W
.
10K
R125
1/4W
.
10K
R117
1/4W
10K
.
C94
63V330N
C98
100V470P
R127
1/4W
.
20K
C88
63V150N
R119
1/4W
.
2K
U2:B
MC33079P
LEAD
3425
S4:A
BYPASS
STUDIO
R165
1/4W
100K
.
ORGAN
M
4032
P13:A 10K
LIN
LEAD-GAIN
1/4W
100K
R209
.
1/4W
20K0
R6
MINI
1/4W
20K0
R5
MINI
U1:A
MC33079P
2 1 5 4
3
N
P
U7:A
MC14007
U1:D
MC33079P
U12:B
NE5532N
U25:A
NE5532N
U5:B
MC33078P
C38
63V
1U
U1:C
MC33079P
R59
1/4W
.
1K
R76
1/4W
.
100R R75
1/4W
.
10K
C31
50V33N
100V
C40
100P
1/4W
2K21
R33
.
R314
1/4W
1K
.
LD2
GRN
6408
C128
250V
4N7
U16:A
NE5532N
8V+ 4
V-
U16:C
R126
1/4W
.
10K
U2:D
MC33079P
U3:C
MC33079P
U3:A
MC33079P
4V+ 11
V-
U3:E
ST R J10
---
FOOT/SW
U3:D
MC33079P
U22:B
NE5532N
REF KNOBPART#
MODEL(S):-
FUNCTION
XC141
R
R
P13
R
R
P10,P11
P12
P4
P1
P2,P3,P5,
P7,P8,P9.
S3
F
F
LEAD-GAIN
F
F
CH-2 &CH-3 GAIN
MASTER
OVERDRIVE
CH-1 GAIN
BASS,MID,TREBLE
5POS-2S SWITCH
K
K
9922
K
K
8399
8399
9922
8399
8399
8400
P
P
4032
P
P
4479
4480
4482
4477
4478
3393
POT LIST
N
N
N
N
N
N
N
N
N
N
N
{NEW}
N
K4
U1:B
MC33079P
U12:A
NE5532N
S TR
J1
-
--
CH-1 I/P -1 LEFT
S TR
J2
-
--
CH-1 I/P -1 RIGHT
13
10
7
4
1
9
11
12
8
#
2
3
5
6
VER#
MODEL(S):-
DATE DESCRIPTION OF CHANGE
V
V
V
V
1V00
V
V
V
V
V
V
V
1V01
D
D
D
D
MAY-10-2005
N
N
N
N
FIRST LAUNCH
K4
D
D
D
D
D
D
D
FEB-07-2008
N
N
N
N
N
N
N
PC#7464, REPLACE R248 & R249 FROM 1K TO 2K #4808
M1239.PCB_DATABASE_HISTORY

11 11
10 10
9 9
8 8
7 7
6 6
5 5
4 4
3 3
2 2
1 1
A
A
B
B
C
C
D
D
E
E
F
F
G
G
H
H
I
I
J
J
K
K
L
L
M
M
N
N
O
O
P
P
Q
Q
of
Filename:
PCB# Sheet 32
Product
Date: Rev: YsType:CSA#
M1239V101_sch.sch2002
M1239
CH-1 INPUT-2
Thu Mar 06, 2008 V1.01
K4
of
Filename:
PCB# Sheet 32
Product
Date: Rev: YsType:CSA#
M1239V101_sch.sch2002
M1239
CH-1 INPUT-2
Thu Mar 06, 2008 V1.01
K4
4148
D18
R78
1/4W
51K
.
R77
1/4W
51K
.
4148
D19
R79
1/4W
1M
.
1/4W
113K
R24
.
1/4W
1M
R32
.
1/4W
4K99
R179
.
R80
1/4W
20K0
MINI
1/4W
100K
R30
.
C55
100V220P
R9
1/4W
.
10K
C5
100V220P
D20
4148
C187
250V4N7
X162
C58
50V680P
C103
63V330N
C104
63V 4U7
C105
63V470N
R136
1/4W
.
3K
C106
63V 4U7
C107
100V10N
R242
1/4W
MINI
1K
R243
1/4W
MINI
2K
PIANO
C108
63V 4U7
R99
1/4W
100K
.
C59
160V
10U
R81
1/4W
17K8
.
R100
1/4W
14K0
.
C61
63V 10U
R82
1/4W
20K
.
CHANNEL-1 INPUT-2
D
05C R/A
P4:B
4482
20K
OVERDRIVE
Q4
5108
TO92
2N5401
R84
1/4W
1K5
.
R85
1/4W
.
4K99
C62
63V 330N
R11
1/4W
.
10K
R10
1/4W
.
10K
R12
1/4W
.
10K
R200
1/4W
.
4K99
D22
4148
R184
1/4W
.
3K
R86
1/4W
.
220R
R13
1/4W
MINI
20K0
R14
1/4W
MINI
20K0
1/4W
100K
R208
.
V2:C
R87
1/4W
2K21
.
C64
50V
22U
R88
1/4W
113K
.
U13:B
MC33078P
4148
D23
D24
4148
C198
100V220P
R139
1/4W
MINI
10K0
R328
1/4W
10K
.
4148
D4
4148
D3
C56
63V220N
R89
1/4W
.
49K9
C199
100V220P
U27:B
NE5532N
R302
1/4W
MINI
10K0
R91
1/4W
.
10K
R92
1/4W
.
3K3
R93
1/4W
.
3K3
R94
1/4W
.
4K7
1/4W
1M
R26
.
50V
C74
22U
50V
C20
680P
R28
1/4W
.
10K0
C67
63V
470N
C57
50V33N
R95
1/4W
.
3K3
R96
1/4W
.
3K3
R97
1/4W
.
100K
R98
1/4W
.
4K7
1/4W
2K21
R34
.
U6:B
MC33078P
R140
1/4W
.
10K
C109
63V470N
R141
1/4W
2K2
.
R142
1/4W
.
3K
C110
100V39N
R143
1/4W
.
3K
R144
1/4W
10K
.
U9:A
MC33079P
11
V-
4
V+
U9:E
C111
400V1N
R145
1/4W
.
2K
R146
1/4W
.
10K
R147
1/4W
.
2K
C112
250V
4N7
C113
400V1N
R148
1/4W
.
2K
R149
1/4W
.
10K
C114
63V 2U2
C116
200V2N2
R150
1/4W
.
2K
R151
1/4W
5K1
.
C115
100V100N
R152
1/4W
.
10K
C117
63V 4U7
LIVE
R180
1/4W
100K
.
STUDIO
R181
1/4W
100K
.
R182
1/4W
100K
MINI
R238
1/4W
100K
.
C60
63V1U
8
V+
4V-
U26:C
R101
1/4W
.
220R
R102
1/4W
20K0
MINI
160V
C66
10U
R83
1/4W
.
1K
R297
1/4W
.
2K
100V
C6
220P
100V
C7
220P
8V+ 4
V-
U27:C
R103
1/4W
.
10K
C63
100V22N
4
V+
11
V-
U8:E
V2:A
Val
2X_TRIODE_HCT
R37
1/4W
.
1K
R153
1/4W
MINI
4K99
R90
1/4W
33K
.
8V+ 4
V-
U22:C
R154
1/4W
.
1K
160V
C16
10U
R105
1/4W
.
2K
R320
1/4W
220R
.
R186
1/4W
.
1M
4477
P1:B
D
B LIN
100K
GAIN
R155
1/4W
.
3K
C118
100V
100N
C119
250V
4N7
R156
1/4W
.
2K
U9:C
MC33079P
BC
TO-92
MPSA63
E
MPSA06
R157
1/4W
20K
.
U10:B
MC33079P
C120
63V 4U7
R183
1/4W
100K
.
3393
S3:B
1/4W
.
1K
R325
100V22N
C125
MC33078 NE5532N
C201
100V220P
BYPASS
6
14
13
8
7
N
P
U14:B
MC14007
R203
1/2W
.
18R
100V
C69
100N
C68
100V22N
C70
160V 10U
Q5
TO92
2N5551
5107
C129
63V 10U
1/4W
4K99
R116
.
R299
1/4W
.
4K99
11
12
9
10
P
N
MC14007
U14:C
C130
63V4U7
C71
63V 330N
1/4W
10K0
R106
.
C8
100V220P
R38
1/4W
.
3K
R107
1/4W
10K
.
C65
63V470N C72
50V680P
4478
P3:B
D
50K
B LIN
TREBLE
C73
50V
33N
R311
1/4W
20K
.
P2:B
D
50K
B LIN
MID
4478
C24
50V33N
C22
63V 2U2
C205
63V4U7
D
P5:B50K
B LIN
BASS
4478
C18
50V22N
I/P SELECTOR
S1:B
R259
1/4W
MINI
1K
R158
1/4W
.
10K
R159
1/4W
.
10K
R160
1/4W
10K
.
C121
63V330N
C122
100V470P
R161
1/4W
.
20K
C123
63V150N
R162
1/4W
.
2K
U9:B
MC33079P
MC33079
ORGAN
R185
1/4W
100K
.
M
4032
P13:B 10K
LIN
LEAD-GAIN
1/4W
20K0
R15
MINI
1/4W
20K0
R16
MINI
U8:A
MC33079P
2 1 5 4
3
N
P
MC14007
U14:A
U8:D
MC33079P
U26:B
NE5532N
U27:A
NE5532N
8V+ 4
V-
U5:C
C76
63V
1U
R109
1/4W
.
1K
U8:C
MC33079P
R104
1/4W
.
100R R163
1/4W
.
10K
C77
50V33N
100V
100P
C131
R312
1/4W
1K
.
V2:B
Val
2X_TRIODE_HCT
U16:B
NE5532N
R188
1/4W
.
10K
U9:D
MC33079P
U10:A
MC33079P
U10:C
MC33079P
4V+ 11
V-
U10:E
U10:D
MC33079P
U22:A
NE5532N
U8:B
MC33079P
U26:A
NE5532N
S TR
J3
-
--
CH-1 I/P-2 LEFT
S TR
J4
-
--
CH-1 I/P-2 RIGHT
U5:A
MC33078P

11 11
10 10
9 9
8 8
7 7
6 6
5 5
4 4
3 3
2 2
1 1
A
A
B
B
C
C
D
D
E
E
F
F
G
G
H
H
I
I
J
J
K
K
L
L
M
M
N
N
O
O
P
P
Q
Q
of
Filename:
PCB# Sheet 33
Product
Date: Rev: YsType:CSA#
M1239V101_sch.sch2002
M1239
CH- 2 & 3
Thu Mar 06, 2008 V1.01
K4
of
Filename:
PCB# Sheet 33
Product
Date: Rev: YsType:CSA#
M1239V101_sch.sch2002
M1239
CH- 2 & 3
Thu Mar 06, 2008 V1.01
K4
W16
4148
D21
4148
D25
CHANNEL-3
CHANNEL-2
R40
1/4W
.
47K
R195
1/4W
.
820R
R194
1/4W
.
820R
R197
1/4W
.
4K99
R191
1/4W
.
4K99
W11:E 6
W11:C 6
C135
16V10U
R234
1/4W
.
180K
C155
50V100N
R278
1/4W
.
4K99
R280
1/4W
.
470R
R288
1/4W
.
10K0
R266
1/4W
.
270R
W19:B
4
C175
100V
100N
C174
100V
100N
R207
1/4W
4K7
.
R206
1/4W
4K7
.
R204
1/4W
4K7
.
C177
100V
100N
C195
50V
100N
100V
C12
100N
R39
1/4W
.
47K
R228
1/4W
MINI
20K0
C185
100V
100N
C184
100V
100N
100V
C26
100N
C43
100V
100N
R230
1/4W
.
49K9
R42
1/4W
MINI
20K0
R41
1/4W
MINI
20K0
C134
400V
1N
C132
400V
1N
1/4W
.
249R
R173
R22
1/4W
.
249R
C191
100V
100N
C81
100V
100N
C169
100V
100N
W14 W14_
C30
63V 10U
W16_
C29
63V 10U
4148
D9
4148
D10
R190
1/4W
.
4K99
R189
1/4W
.
4K99
W11:F 6
W11:B 6
W11:D 6
D
4479
P11:B20K
05C R/A
CH3-GAIN
4148
D29
R254
1/4W
68K
.
C136
16V10U
1/4W
.
10K
R316
1/4W
.
1K
R318
1/4W
.
5K1
R196
1/4W
.
5K1
R187
C154
63V 4U7
C157
16V
100U
Q9
5106
TO92
MPSA63
R250
1/4W
.
33K
R251
1/4W
68K
.
R275
1/4W
MINI
10K
R274
1/4W
.
10K
U21:A
MC33079P
4V+ 11
V-
U21:E
R235
1/4W
.
180K
Q8
5106
MPSA63
TO92
R277
1/4W
.
10K
R279
1/4W
.
4K99
R276
1/4W
.
10K
R222
1/4W
.
3K3
R220
1/4W
.
3K3
R218
1/4W
.
4K7
R252
1/4W
.
1K
C162
50V
12N
R293
1/4W
.
100R
R281
1/4W
.
470R
C161
50V
12N
R292
1/4W
.
100R
C147
50V680P
4478
P9:B
D
50K
B LIN
TREBLE
C144
50V
33N
4478
P8:B
D
50K
B LIN
MID
C143
50V33N
D
P7:B50K
B LIN
BASS
4478
C139
50V33N
4478
P9:A
D
50K
B LIN
TREBLE
R217
1/4W
.
100K
C137
50V
33N
4478
P8:A
D
50K
B LIN
MID
C138
50V33N
D
4478
P7:A50K
B LIN
BASS
C166
50V22U
R291
1/4W
.
10K0
C164
50V22U
C163
50V22U
R290
1/4W
.
10K0
R289
1/4W
.
10K0
3923
J14
RIGHT LINE OUT
R237
1/4W
.
2K
R236
1/4W
.
2K
R307
1/4W
MINI
270R
R271
1/4W
.
270R
R264
1/4W
.
270R
R263
1/4W
.
270R
4V+ 11
V-
U19:E
R270
1/4W
.
270R
63V
C160
4U7
W19:C
4
W19:A
4
W19:D
4
R205
1/4W
2K49
.
C171
100V
100N
C170
100V
100N
C193
50V
100N 100V
C11
100N
C173
100V
100N
R226
1/4W
MINI
20K0
R231
1/4W
.
49K9
100V
C25
100N
C42
100V
100N
8V+ 4
V-
U15:C
C183
100V
100N
C182
100V
100N
C133
400V
1N
C75
400V
1N
C80
100V
100N
C168
100V
100N
C189
100V
100N
8
V+
4V-
U24:C
W11:A 6
4148
D28
C158
16V
100U
R246
1/4W
MINI
180K
1/4W
.
1K
R317
RED
LD4
6405
U23:A
MC33078P
8V+ 4
V-
U23:C
U23:B
MC33078P
R282
1/4W
0.1%
681R0
C151
63V 4U7
R284
1/4W
0.1%
681R0
C145
50V33N
C140
50V680P
R216
1/4W
20K0
MINI
R224
1/4W
20K0
MINI
C165
50V22U
1/4W
10R
R295
.
C142
100V
100P
C148
100V
100P
R294
1/4W
10R
.
S2:B
3923
J13
LEFT LINE OUT
R267
1/4W
.
270R
R306
1/4W
MINI
270R
R262
1/4W
.
270R
R265
1/4W
.
270R
Copper
Tie Here
Tie-net Name
R193
1/4W
.
4K12
R192
1/4W
.
4K12
R283
1/4W
0.1%
681R0
W12:C
6
W12:A
6
R247
1/4W
MINI
180K
4148
D26
4148
D27
C176
100V
100N
C179
100V
100N
C181
100V
100N
C190
100V
100N
100V
C207
100N
C194
50V
100N C79
100V
100N C14
100V
100N
R227
1/4W
MINI
20K0
C28
100V100P
U15:A
MC33078P R245
1/4W
MINI
1K0
U15:B
MC33078P R244
1/4W
MINI
1K0
R253
1/4W
.
33K
U24:B
MC33078P
R108
1/4W
.
562R
R20
1/4W
.
3K74
U24:A
MC33078P
R43
1/4W
.
562R
R18
1/4W
.
3K74
U21:D
MC33079P
MC33079P
U21:C
W12:F
6
W12:D
6
W12:B
6
W12:E
6
1/4W
.
10K
R315
U4:B
MC33078P R249
1/4W
.
2K
C153
63V 4U7
U4:A
MC33078P
C152
63V 4U7
C150
16V
100U
R213
1/4W
.
3K3
R233
1/4W
.
680R
D
4479
P10:B20K
05C R/A
CH-2 GAIN
C149
16V
100U
R212
1/4W
.
3K3
R232
1/4W
.
680R
D
4479
P10:A20K
05C R/A
CH-2 GAIN
R210
1/4W
.
4K7
RED
LD3
6405
R286
1/4W
0.1%
681R0
R285
1/4W
0.1%
681R0
R301
1/4W
2K2
.
LD5
POWER
6554
BLU
C203
100V220P
R269
1/4W
MINI
1K0
C146
50V680P
R223
1/4W
.
3K3 C202
100V220P
R268
1/4W
MINI
1K0
R221
1/4W
.
3K3
R219
1/4W
.
4K7
R215
1/4W
.
3K3
C141
50V680P
R214
1/4W
.
3K3
4V+ 11
V-
U20:E
U20:A
MC33079P
R211
1/4W
.
4K7
D
1B LIN
P12:B
4480
10K
MASTER
D
1B LIN
P12:A
4480
10K
MASTER
S TR
J11
-
--
RIGHT
R
L
J6
GOLD .475
3460
R229
1/4W
MINI
20K0
C192
50V
100N C78
100V
100N
C13
100V
100N
C172
100V
100N
C180
100V
100N
C178
100V
100N
C188
100V
100N
100V
C206
100N
C27
100V100P
S TR
J9
-
--
LEFT
MC33079P
U21:B
8V+ 4
V-
U4:C
R248
1/4W
.
2K
C156
50V100N
R255
1/4W
.
1K
U18:B
NE5532N
U18:A
NE5532N
8V+ 4
V-
U18:C
R287
1/4W
0.1%
681R0
S2:A
GROUND LIFT
3425
R225
1/4W
.
100K
U20:B
MC33079P
63V
C159
4U7
RIBBON CABLE
U19:C
MC33079P
D
4479
P11:A20K
05C R/A
CH3-GAIN
U19:A
MC33079P
J8:A
3922
MIC
U20:D
MC33079P
U19:B
MC33079P
U20:C
MC33079P
U19:D
MC33079P
S TR
J5
-
--
I/P LEFT MONO
S TR
J7
-
--
I/P RIGHT
ST R J12
---
HEADPHONE

VCD
CLINCH
ORIGIN LONG AXIS
SHORT AXIS
INSERT
ORIGIN
M1239V1.01
Pcb Mech V1.01
Pcb Mech
M1239
BlankSize - 19100x10400
1
1
Top Assy M1239
Top Assy V1.01
Layers for wires
V1.01
M1239
SEE LAYOUT DOCUMENTATION
GUIDE
ETCH
-
+
TIP
RING
SLEEVE
TIP-SW
SL-SW
RING-SW
7
77
GUIDE
ETCH
1
GUIDE
ETCH
GND
WHT RED
21
21
2
1
TIP
RING
SLEEVE
TIP-SW
SL-SW
RING-SW
7
TIP
RING
SLEEVE
TIP-SW
SL-SW
RING-SW
7
TIP
RING
SLEEVE
TIP-SW
SL-SW
RING-SW
7
TIP
RING
SLEEVE
TIP-SW
SL-SW
RING-SW
7
TIP
RING
SLEEVE
TIP-SW
SL-SW
RING-SW
7
TIP
RING
SLEEVE
TIP-SW
SL-SW
RING-SW
7
TIP
RING
SLEEVE
TIP-SW
SL-SW
RING-SW
7
POWER
I/P SELECTOR
MASTER
CH-1 I/P -1 LEFT
OVERDRIVE
FOOT/SWHEADPHONE
CH1-GAIN BASS
GROUND LIFT
LEFT LINE OUT
RIGHT LINE OUT
TREBLE
MIC
LEAD
TREBLEBASS MID CH3-GAIN
CH-1 I/P -1 RIGHT CH-1 I/P-2 LEFT CH-1 I/P-2 RIGHT
LEAD-GAIN
I/P LEFT MONO I/P RIGHT LEFT RIGHT
MID CH2-GAIN
3489
5629
4036
5989
6554
3602
3672 4041
5629
5629
6435
36724041
5629
3425
6405
4037
6405
4480
6405
3918
4482
3489
5629
5989
3498
5989
3498
4036
5989
3676
4037
5989
3623
3460
3489
5629
5629
5629
3732 3732
4477 4478
3425
39233923
4037
4478
3393
3922
6408
3425
4478
4478
4478
4479
3623
3918 3918 3918
4032
3918 3918 3918 3918
3676
5989
4037
4478
4479
1M
22N
17K8
113K
51K
100K
22N
1K5
51K
2K
2K2
22N
1M
51K
20K
100K
113K
22N
33N
1N
49K9
20K0
680P470P
10K
10K
10K
20K0
1K
100N
4148
4148
1N
220P
4U7
63V
20K0
4148
20K0 220P
100R
100K
330N
4K99
1K
2K
470N
1K 1K1N
4N7100N
220P
1K8
10K
100K
2K2
100K
100N
2K
100N
100K
3K
1N
220P
220P
470N
10N
4M7
3K3
3K74
4K99
4K99
4K99
100P
4148
4K99
820R
270R
820R 1N
10K
220R
681R0
4148
681R0
220P
3K
4148
4K99
1K
270R
10K
100N
1K
270R
12N
4148
4148
10K
1/2W
18R
2K21 14K0
680P
2K21
3K
3K
10K0
10K
100K
150N
20K0
14K0
10K 20K0
10K
3K 4K7
3K10K 1K
20K0
1K
5K1
220P
3K 3K3
10K
33N
3K3
10K
1K
220P
20K0
1K
3K3
3K3
220R
3K3
2K
10K 680P
680P
2K 680P
33K
100K
10K
100K 100K
220P 220P
33N
100K
2K
10K
10K 5K1
10K
1K
470N
220R
2K
100R
10K
10K
2K
1K10K
4007
2K
10K0
180K
2K
20K
33N
4K7
220R
1K
10K
10K
4K7
100N 4K99
3K3
100K
100K33N
4K7
33N
4148
4148
4K7 4K7
680P
2K 3K3
3K3
680P
220P
562R
3K3
100P
4K12
180K
4148
270R
4148
68K 47K
270R
2K
220P
270R
270R
49K9
1K
20K0
10K
470R
20K0
4K99
20K0
681R0
10K
20K0
100P 4148
20K0
1K0
1K
4148
4148
681R0
10R
10K0
220N
100N
100N
1K
4N7
100N
100N
100N
100N
100N
681R0
100K
1U
20K0
160V
10U
2N5551
49K9
113K
1M
10R
50V
22U
17K8
10K
113K
1M
220N
50V
22U
22N
4U7
63V
4U7
63V
100N
4N7
39N
2U2
63V
1K5
2N5551 2N5401
33K 51K
1U
1M
33N
100N
10N
100K
220P
MC33079P
330N
4U7
63V
470N
1K
10U
63V
33N
100N
2N2
4N7
100N
100N
100N
MC33079P
220P
100N
100N
100K10K
10K
470N
4148
2K
100K
100N
4U7
63V
2N2
4007
4K99
4U7
63V
100K
3K
2K
4K99
220R
3V0
20K
100N
4U7
63V
39N
2U2
63V
1K
4K7
330N
10U
16V
10U
16V
33N
100N
4U7
63V
4U7
63V
4U7
63V
470P
100N
4148
100K
3K3
100K
4K99
4K99
4K99
1N
100N
4148
100N
1N
33K
16V
100U
100N
100N
330N
10K0
10U
63V
16V
100U
1K0
1K0
100N
4U7
63V
4U7
63V
4U7
63V
100N
330N
100N
20K
100K
100N
100N
10U
63V
12N
5K1
100N
10K04K7
100N
4148
68K
MPSA63
BLU
10K
10K470R
100R
2K21
22N
50V
22U
1K8
1.0W
160V
10U
160V
10U
275V
22N
50V
22U
50V
22U
1M
1U
1U
50V
22U
1/2W
18R
100K
2K
2K
4K7
2K21
50V
22U
10U
160V
DPDT PUSH
10K
20K
MC33079P
4K7
4K7
33N
10K
20K0
10K0
220P
63V
2U2
2K
10K
470N
33N
100K
2K
10K 33N
10K0
3K3
10K
MC33079P 680P
3K3
3K
20K0 20K0
10K
100P
100P
3K3
MC33078P
1K
470N
RED
3K 2K
10K 1K
1K5
180K
16V
100U
2K
4U7
63V
330N
10K 20K
10U
63V
10K
4N7
150N
MC33078P
16V
100U
3K
4U7
63V
4148
4148
NE5532N
3K
10K
330N
33N
20K0
3K3
4N7
4148
100N
2K49
10K0
MC14007
2K
33N
680P
100K
4K99
MC33078P
4K12
4K99
562R
MC33078P
220P 4K99
RED
MPSA63
3K3
270R
4U7
63V
680P
MC33079P
2K
1K
47K
20K
4K99
270R
270R
180KMC33079P
100P
49K9
4148 220R
MC33078P
1K0
100R
220P
1K
1B LIN
10K
4148
33K
20K0
RED
4K99
2K2
220P
681R0 5K1
20K 05C R/A
10K0
1M
10K0
4N7
100N
100K
1K
100N
249R680R
100N
160V
10U
2N5401
33K
10K
1M
22N
4U7
63V
4U7
63V
470N
50V
22U
10K0
10K0
100N
MC33078P
100N
100N
4148
NE5532N
10U
63V
MPSA63
100N
100N
4U7
63V
NE5532N
100K
249R
680R 3K74
100N
4U7
63V
NE5532N
NE5532N
10U
63V
100N
100N
22N
2U2
63V
10U
160V
160V
10U
160V
10U
Val Val
330N
100K
B LIN
50K
B LIN
DPDT PUSH
10K
4148
MC33079P
50K
B LIN
NE5532N
5POS 2S
1N
100N
GRN
DPDT PUSH
BC560C
MPSA06
20K
MC33079P
20K0
50K
B LIN
50K
B LIN
50K
B LIN
NE5532N
MC14007
20K
05C R/A
MC33079P
MC33078P
LIN
10K
50K
B LIN
20K
05C R/A
SG
V1.01
+15V
-15V
15VT
SG
V1.01
-15V
V1.01
+15V
CHASSIS
GND
AG1
R32
C125
R81
R24
R78
R99C63
R84
R77
R118 R121
C124
R31
R73
R120
R66
R46
C53
C24X74
C84
R47
R71
C19
X185
C98
R55
X73
X193 R328
X75
R322
R7 R36
C100
X189
D2 D1
X191
C101
C200
X169
C93
X28
R14
X158
X167
D4
X30
R13
C8X65
X24
R104
X92
R169
C103
R116R240
X42
X31
R296
C54
R69 R83
C113 X71
C112
C189
X96 X95
C201
X204
R174
X76
R188
R175
R141 R183
C118
X178
R156
X176
X179
C182
R185
R142
X68
C111
X83C47
X61
C197
C109
X85
C107
R178
X77
X173
X163
R220
X175
X118
X100
X99
R20
R190
X138
X49
R201
R189
C148
X40
D25
R299
R195
R264X206
X140
R194
C133
X47
X48
X137
X202
R103
R101
X44
X172
R285
D23
R287
C199
R184
D24
X46
R278
X82
R312
X98
R306
R276
X80
C156
R255
R307
C162
D9
D28
R275
R203
X63
R34 X4
R68
C20
X8
R53 X9
R111
R110
X69
R27 X5
R114
R165
C88
R58
R100R117 R80
X12
R124
R112 R44
X14 X13
R35
R1
R199
R5
R325
R132
X151
X152
C2
R128
R96
X136
R4
C77
R93
R129
R59
C4 R8
R321
R49
R48
R319
X122
R51
X144
X123
R138 R134 C37
C72
X125 X124
R137 C58
R19
X27X66
X67
R168
R12R97
R56
C6
C7
X60 X59
X142
C57
X57
R180
R105
R11 X126
R159 R151
R163
R21
C105
R320
X54 R241
X32
R76
R75
R158
X119 X116R147
R259
R140
D16
R145
R62 X130
R235
X180
X33
X29
R162
X84
R313
C143
R218
R60
R314
R149
R160
R210
X188
C192 R172
R214
R217
R177C144
R204
X21
C145
D8 D6
R219 R211
C141
X34
X106
R237 R223
R215
X117
C147
X171
X79
C196
R108
R213
C142
X108
R193
R246
D27
X107
R270
D26
X35
R251
X109
R39X110
R266
R249
C55X111
R265
R267
R230
R154
R42
R274
R280
R229
R179
R227
R282
R315
R226
C27 D20
X97
R41
R269
R318
D22 D19
R284
R295
R288
C35
X2
C190
X50
C11
X18
X19
X16
X183
X156
R37
X72
C187
C185
W18
C69
C51
X132
X161
X41
X141
C80
C171
R286
R30
W2
BLK
W1
WHT
C60
R102
C66
Q5
R89
R88
R79
R294
C165
X11
R67
R107
X10
R23
R74
C56
C74
C18
C204 C205
C83
C85
C82
C87
R70
X64
Q2 Q3
R52
R72
C38
R25
C10
C172
C96
R166
W29
X36
C3
U1
C95
C91
X190
X39
C41
R198
C129
C31
C176
C99
X157
C102
C188
C42
C43
X120
U8
C5
X20
C181
C180
R239
R126
X159
R91
C65
D3
R297
X93
R182
C115
C117
C116
X70
X184
D17
R113
C106
R238
R143
R148
R65
R61
D15
R157
C184
C108
X177
C110
C114
R133
R206
C44
C136
C135
C137
C178 C151C152
C120
X62C122C191
D14
R209
R212
X186
R225
R200
R298
R191
C134
C81
D21
C155
C132
R250
C157
X187
X45
X78
C175
X148
C169
X22
X139
C62
R106
C61
C158
R244
R245
C206
C159
C154
C160
X43
C174
X208
X146
C71
C194
R311
R208
C13
C193
X101
C30
C161 R187
C170
R139
R207
C14
D29
R254
Q9
LD5
R277
R316R281
R293
W3
120VDC
RED
W4
GRN
K4
M1239 3/3 W12
R87
C68
C64
R300
C16
C59
C167
C163
C164
R26
C76 C48
C33
X23
R202 R29
R119
R115
R98
W11
R33
C23
C52
S1
X52
R123
R127
U2
R45
R94
C34
R2 R6
R302
C1
C22
R131
R125
C97
X201
X153
C73
R167
R57
R3
X182
C39
R304
X51
R92
R135
U3
C36
R95
R38
R15
R16
X1
R9 X7X25
C131
C40
R50
X58
U6
X162
R109
C67
X127 X129
LD1
R136 R150 X56
R144 R258
X121 X115
R170
R234
C149
R243
C104
C45
R63 R64
C46
W24
R146
C119
C123
U23 C150
R171
C126
D12
X131
D11
U12
X53
R155
R152
C121
C138
R224
R221
X164
C128
D13
C195
R205
R122
U7
R236
C139
C146
R181
R197
U13
R192
R130
X165
R43
U24
C198
R153
Q8
R222
R263
C153
C140
U20
R248
R252
R40
R82
X166
R85
W14
RED
R271
R262
R247
U19
C28
R231
D10 R86
U15
R268
R292
C202
R317
BOTA
BOTBWIPA
TOPAWIPB
TOPB
P12
D18
W16
YEL
R253
R228
LD4
R279
R301
C203
R283 R196
J1
-
-
-P4
R28
R164
X3
R289
X102
X174
C186
C9
R17
R242
X155
X154
C25
R22R233
X113
X145
X150
X55
X38
W14_
RED
C173
X15
C50
Q4
R90 R54
R186
C17
X6
J10
- - -
J12
- - -
W19
C90
C89
C86
C166
R290
R291
C12
U5
X26
X17
C79
C78
D5 U22
C127
Q1
C183
W25
C179
C92
K4
M1239 1/3
U25
W9
R176
R173
R232 R18
X112
X149
C168
C130
X105
U26
LR
J6
U18
C29
W16_
YEL
X37
C207
C177
C32
C21
C70
C15
C49
V2 V1
C94
BOTA
BOTBWIPA
TOPAWIPB
TOPB
P1
BOTA
BOTBWIPA
TOPAWIPB
TOPB
P5
S2
J13
J14
R10
D7
W22
U10
BOTA
BOTBWIPA
TOPAWIPB
TOPB
P3
U16
S3
C75
C26
X114
J8
LD2
S4
Q6
Q7
R161
U9
R216
BOTA
BOTBWIPA
TOPAWIPB
TOPB
P9
BOTA
BOTBWIPA
TOPAWIPB
TOPB
P7
BOTA
BOTBWIPA
TOPAWIPB
TOPB
P8
U27
U14
BOTA
BOTBWIPA
TOPAWIPB
TOPB
P11
U21
U4
K4
M1239 2/3
W10
J2
-
-
-
J3
-
-
-
J4
-
-
-P13
J5
-
-
-
J7
-
-
-
J9
-
-
-
J11
-
-
-
W23
BOTA
BOTBWIPA
TOPAWIPB
TOPB
P2
BOTA
BOTBWIPA
TOPAWIPB
TOPB
P10

SEE LAYOUT DIAGRAM
PRODUCTION NOTES K4 M1239
---------------------------------
1- CUT METAL PIN OF J8 , J13 AND J14 XLR
2- RTV ALL CAPACITORS
3- C167, B.A. WILL PUT A 220N #5600 INSTEAD OF 22N
Break this
connection here.

NE5532N MC33078P MC33079
SEE LAYOUT DIAGRAM
PIN CONFIGURATION
ECB
TO-92
MPSA63
MPSA06
5
2
#
6
3
4
1
DATE
MODEL(S):-
VER# DESCRIPTION OF CHANGE
D
D
V
V
N
N
D
D
D
D
V
V
V
V
N
N
N
N
K4
M1239 DRILL HISTORY
4
1
6
5
3
#
2
MODEL(S):-
PC#
*PLACE IMPLEMENTED CHANGES INTO BOARD HISTORY
PENDING CHANGE
X
X
X
X
X
X
PC
PC
PC
PC
PC
PC
M1239 PENDING CHANGES
K4
12
9
6
3
#
13
11
10
5
4
8
7
2
1
DATE
MODEL(S):-
VER# DESCRIPTION OF CHANGE
D
D
DV
V
V
V
V
D
D
N
N
N
N
N
D
D
DV
V
V
K4
V
V
D
DN
N
N
N
N
M1239.PCB_DATABASE_HISTORY
MAY-10-2005 FIRST LAUNCH1V00
FEB-07-2008 1V01
. . PC#7217, REPLACE C167 22N #6435 WITH 220N #5600
PC#7464, REPLACE R248 & R249 FROM 1K TO 2K #4808
FUNCTION KNOBREF
MODEL(S):-
PART#
R
R
R
P4
P13
R
P7,P8,P9.
P10,P11
P12
S3
P1
P2,P3,P5,
F
F
F
OVERDRIVE
LEAD-GAIN
F
CH-2 &CH-3 GAIN
MASTER
5POS-2S SWITCH
CH-1 GAIN
BASS,MID,TREBLE
P
P
P
4482
4032
P
4479
4480
3393
4477
4478
N
N
N
N
N
N
N
N
N
N
N
N
K
K
K
9922
9922
K
8399
8399
8400
8399
8399
{NEW}
POT LIST
K4
2G
2K
1 9
1K
1G
4
H
6
2
3
H
8
7
2P
5
HT
1P