Yorkville YS4040 User's Manual
Contents
1. 2 o F EE 1 gt 18 18 18 pe 805600 5 z aE 25 z gt 1N750ARL ENS SF PRISE pere 5 5 PEN 588 BC560C 5 T 06 gg 5 4 95 8 MPSA63 2 4K7 5102 R50 4148 22M Au 63v 220N 02 teu 174 TOS 7 7 2 15K 4 ue 187 5106 az R18 ATEN R1 092 15K 3 R24 15K TAN 100K Rig 5 2 249R R25 lt LM1360 1781 4 rises 4 MINI 47K 1 Bloom R27 AR T 25 TAW 4 A oe LVGND o gt aS ERAS AEE R77 781004 5 25 15K A14 22 15 ga of 5 2 TAN TAW Bee che 19 15 SW LVGND U4 B 13 Ror 1 2 LREF gz 5 RCLIP 42 w1 B R43 Se Gap gel 3 mue Lee SES Elik 18 4 zwi 4 4 AUD vono 12 12 1 4390 R45 6 ite 330 16V awe nah M Fun2. a 16 5 Swe Me was k i2 54 ap al Q ain 5 7 145 ROSIG R202B 5 3700 1 4W U201 B 36 4 16 5 KD A R204B 2 3721 14W ROG 4 4 ROG RDRV 3721 78 ACT K1 B 3700 5 2 a RES 78V lt 5 Le en X of tin ndo nto MJF6388 8 548 SVE SY R213 R215 5 ge 0240 AAS Off STN STH TW 14W 204 PRTCT ASIE 15K 1K 815 K1 A 4007 RAD T221D R217 145v 15 pets TANT 18 100 407 5 6 co Ae 5 5 gt 17 52 550 9 a gt D 5 78 5103 244 4 5 58 5 E 220K 56 Blo 2N5401 18 I 1 als SIN LVGND 5 0202 Blo 8 18 5108 2 Ala ac 35 59 2 gt i 5 a 5 Zhan 92 5 MJF6668 ER 23 R214 2 R216 205 198 100v 407 2159 85 2 TAN TAN 6 15K 1K 814 C203 5 5 y MINI asss SS a gt T221D x 7 ol gt 5554 Slo 5 AS 9 x 5 06 als ASE av wo ayy 9 4148 AAS E 4 14 8 a MPSA6 ite R211 S 2 225 Q208 1 4W 2
3. m_a 55 eee sS me 1r T T o ee o 5 er EE men RE es r SSeS SS TS EA O SSE a r SS sh a e DO a SS SS a _ _ _ _ EE EP 2S DR SS lt lt PROFESSIONAL SERIES 8 Lug aA ns NE 5 22 SSS mar se TT eee a SS OOO Pr eo 77 7 77759 r o _ a ms mme TT _ ee p gt 5 Le ae eee Re m E lt lt 5 7 2 rT PER
4. o SS M LES SSS o a et o e lt r Citer 2 a WEB www yorkville com WORLD HEADQUARTERS CANADA U S A Yorkville Sound Yorkville Sound Inc 550 Granite Court 4625 Witmer Industrial Estate Pickering Ontario Niagara Falls New York L1W 3Y8 CANADA 14305 USA Voice 905 837 8481 Voice 716 297 2920 Fax 905 837 8746 Fax 716 297 3689 MODEL TYPE YS4040 SERVICE MANUAL Yorkville Quality and Innovation Since 1963 Printed in Canada Manual Service ap4040 00 4v0 pdf IMPORTANT SAFETY INSTRUCTIONS This lightning flash with arrowhead symbol within The exclamation point within an equilatereal triangle is an equilateral triangle is intended to alert the user to AUTIO N A VIS intended to alert the user to the presence of important the presence of uninsulated dangerous voltage operating and maintenance servicing instructions in within the product s enclosure that be of sufficient RISK OF ELECTRIC SHOCK the literature accompanying the appliance magnitude to constitute a risk of electric shock to persons DO NOT OPEN Le point d exclamation l
5. 8701 4 40 KEPS NUT gt 77 TORQUE 4 INCH LB 3 MOUNTING HARDWARE FOR 040 AND 041 2234 CLAMP lt 3517 8 NYLON WASHER 3851 1 2 PCB PLASTIC 5 gt lt lt T126 TYPE DEVICE 4060 SIL THERMO PAD gt HEATSPREADER gt gt 3851 2234 8902 SPCR CLAMP 8485 440 SCREW WASHER 4060 SIL PAD WASHER 4 CLAMP DETAIL SEE NOTES 2 AND 3 4 MOUNTING HARDWARE FOR Q11 Q12 8741 4 40X 1 2 BOLT lt 3501 BELL WASHER 8667 SHOULDER WASHER gt lt 220 DEVICE 3846 MICA gt HEATSPREADER gt lt PCB lt 8701 4 40 KEPS NUT 5 MOUNTING HARDWARE FOR TO3 OUTPUTS TORQUE 4 INCH LB 8835 BOLT TRANSISTOR lt 3916 THERMAL PAD lt HEATSPREADER TS 8800 6 32 KEPS NUT o INITIAL TORQUE FOR TO 3 S IS 8 INCH LB FINAL TORQUE AFTER HEATSINK HAS COOLED FROM WAVE SOLDER IS 6 INCH LB 6 USE 2006 SMALL BODY 1R 1W FOR R33 AND R49 7 MOUNTING DETAILS FOR Q30 TRIAC USE 8799 TO MOUNT TRIAC Q30 1 mA 1 4 BEND DOWN 1 4 FROM BODY OF THE TRANSISTOR IMPORTANT AFTER MOUNTING DEVICE DO NOT CUT LEGS BEND LEGS IN DIRECTION SHOWN IS IMPRATIVE THAT LEG
6. BRIDGE XF_SEC_MIDW20 Wis BRIDGE BRIDGES RED B 0 011102 U201 0202 4148 22024 R204A OKO 10 0 CA R240 33 007 1134 44 MC33078P 0 a gt 0 2 LL gt 0 2 0n a x TO COMPLY WITH EUROPEAN SAFETY STANDARD EN60065 M1147 AP4040 2 BRIDGE MOUNTED 111134 V44 BY WIRING 6419 Q210 0 ZD202 17 122 0 R252 47 FE 20018 oor D223 D 0210 R251 7 R219 30 2465170220 4001 W38 4056 BRIDGE wis 5 BRIDGER 007 D206 BC550 MPSA06 LAN Pcb Mech 8012 12V0 Top Assy 8012 12 0 BlankSize 14000 8000 SEE LAYOUT DOCUMENTATION gt SEE LAYOUT DIAGRAM X8012 PRODUCTION NOTES M1147 AP4040 1 FOR C1 USE 22N FOR NORTH AMERICAN AND 680N FOR EURO 2 ADD RTV UNDER RELAY AND BEND LEADS FLAT TO PCB RELAY Cc 45 SEE LAYOUT DIAGRAM PIN CONFIGURATION PCB PATABASE HISTORY 2N6517 MOD AP4040 AND V44 MOD i AP4040 AND V44 2N5401 DATE VER DESCRIPTION OF CHANGE DATE VER DESCRIPTION OF CHANGE 205551 MJF6388 5712798 0 0 0 MAR 30 98 200 REPLACE R233 amp THERMISTOR WITH SURGISTORS D 07 98 PC 5664 ADD EXTRA PROTECT CIRCUIT D MPSA13
7. Se AP VX VTC POT PCB POT PCB PCB X8011 Date Fri May 29 2009 Rev 8V00 Filename X8011V800sch sch2002 M1128 AP V 1128 175 M1133 X24 VTC PRTCT_2 V 265259 9 049 000404 Supply 50 pu BIZ 3 R34 4708 R47 Te 4708 2620P gt e TELS Ds F TAE lt 24 220R 14K7 R45 Para RIDER RER 6 of 20 TE BlankSize 14000x11000 1242498 2 R23 242495 2 R24 T a StepAndRepeat X2 6 875Y3 3 300 ORIGIN 4 gt SEE LAYOUT DOCUMENTATION 5 SEE LAYOUT DIAGRAM 4 gt X8011 PRODUCTION NOTES M1128 AP VX P22 POT PCB 3511 WASHER 870 8 LED Bice PT 373 45 SEE LAYOUT DIAGRAM 4 X8011 PCB_DATABASE_HISTORY X8011 DRILL HISTORY MODELS 020 AND AP4040 VX2400 AND VX2402 V42 AND V44 MODEL S 4020 AND AP4040 VX2400 AND VX2402 V42 AND 4 DATE VER DESCRIPTION OF CHANGE 0 97 ODUCTIO D LEAD PIN REFERENCE 2 APR 17 98 2 00 5664 RIBBON CABLE CONNECTIONS CHANGED FOR D ee 3 PROTECT CIRCUIT D 4 13 00 PG 5736 TRACES CHANGED SUPPORT SCREWS 0 Le MIE D es 8 577902 410 BEE RETO VEIT AND MPSAOG 4 OD 10 J
8. e TDS DEX zoo LAr 0102 Loon osearn 5 8 Es V6IO vizo err 2 a ter Hoce wd voza Om Tues 28 5 veu EE vez 0 S 5 0927 8 2013 ozm 510 VL9H COL R81 CRUE gel ov gO swe pe JOE 2 008908 909594 V8c9 VOrd Hoze vecu lt 8 55 8 ZNZ 27 2 Ca LE 001 lt 8717 D vora Sg FAY 9 609 tY eo view vesd Bor gt 5 8 3 4 F5 a 3 02201 2 2 5 5 5 5 a is 2888 5 n 79 145V RED 121 N_ YEL 19 YEL 2 5 DO NOT STUFF WIRES OR SPEAKON JACKS FOR SERVICE BOARDS 4 SEE LAYOUT DOCUMENTATION AP4040 V44 LAYOUT 4 SEE LAYOUT DIAGRAM 4 M1146 AP4040 V44 PRODUCTION NOTES 1 MOUNTING DETAILS FOR 5W ADD 8629 SPACERS ONLY ON 5 WATT RESISTORS R29 AND R45 ENSURE SPACERS ARE UNDER RESISTOR BODY ENOUGH TO RAISE IT OFF THE BOARD SURFACE 2 MOUNTING HARDWARE FOR Q5 AND Q6 lt 8902 4 40 X 3 4 PAN PHIL lt 8485 ZINC 6 WASHER 1 7234 CLAMP lt T264 DEVICE 3797 THERMO PAD gt HEATSPREADER gt
9. 63V 20 T amp R RAD 2EL po po po A po 1 4W 200R0 1 FLAME PROOF T amp R RES 6 32 X 1 4 PAN PH TAPTITE JS500 330 16 20 T amp R RAD 2 D 1 8W 22080 1 FLAME PROOF T amp R RES 6 32 X 3 8 PAN PH TAPTITE JS500 1000 25V 20 T amp R RAD 2EL 1 4W 2208 5 T amp R RES 6 32 X 3 8 FLAT PH TAPTITE BO C HEA 330U 100V 20 CAP BLK 12 25 EL 1 4W 2208 5 T amp R RES NJ A A 6 32 X 1 2 PAN PHIL MS ZINC CLEAR 470U 63V 20 CAP BLK 12 25 EL 1 8W 2498 2 PROOF T amp R RES D 6 32 X 5 8 PAN PH TAPTITE ZINC 330U 25V 20 BLK 10X13MM EL o 1 4W 2708 5 T amp R RES 6 32 X 7 8 PAN PH MS JS500 Yorkville Sound http www yorkville com Yorkville AP4040 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 C
10. N35 2010 0 5 1N750A 00 8 Function SPEAKON 4C 250 2N2 400 IRF630NPBF 021 2 SPEAKON 2 TO220 MR854 Function Function J1 B 2001 220P MJ21196 MJ21196 MJ21196 MJ21196 4 1WO Q13 015 07 919 16V0 1N4745A Function Function Function Function 330 16V 72 16W 6 407 53V 224 50 5 J2 A unction cu R28 014 4 0 big SPEAKON 4 Function 250 MR MR 22001 MJE340 1 54 854 854 MRB54 Q40 MJ21196 MJ21196 MJ21196 MJ21196 M Q16 Q18 20 014 25v 3300 100 160V Qi Fa 2805949 0 5908 1 Q5 TO3 TO3 TO3 TO3 Function Function Function Function 7005 R26 c12 fa cao 22N 100 GOR 22N 100 UNI BC550C MJE340 Q18A BC550C 6873 T0126 220 50V 207 2600 gt ows 1 5246 20 2 2 400V aK ce 3300 25 R85 1
11. 1 4W 5103 aan 0 MJF6388 8 T R227 0207 D 54829 lve 0 El 815 aS STN STA gt T221D 5 SE 2 RR 5 2N6517 8 2N5401 2 2 5551 0211 azoa 8212 i 4 4 ga ga MPSA06 MJF6388 W36 LCUP W37 8 op 4148 MPSA13 6668 7 4 warea l ay k 1 4 MPSA43 4700 63 550 56 O 6 6 wee c 8 3 W37 C 8 27K 4 14W 560 MPSA63 8 4 2N6517 eta 0220 R25 87 Wa7 E 8 52 3 Q211 1 4W b654 2 wa6 F 8 4007 680R 5 7092 7 0221 5 13 2 10 w36 G 8 wazaa rose x 5 1 8 4 e o 4007 021 5 E CBE EBC BCE Toe ig 70 92 92 TO 221D 3700_DRW 3721_DRW ola al _ JEKE TZ Product 4 8 PCB Sheet 1 of 1 Date Wed Feb 03 2010 12 00 YsType YS LOG ROG 4007 5 4007 LVGND 22 Filename X8012V1200sch sch2002 11 B8 CG 0 EN StepAndRepeat X2 6 675Y1 0 000 M1147 AP4040 BLK BRIDGE MOUNTED BY WIRING 6419 or fire
12. 2 1 8W 108 5 T amp R RES 21 14C 28AWG DIP HDR 05 220N 63V 10 T amp R RAD 2FLM 1 4W 108 5 T amp R RES RELAY 1 02 DC48 006 5 470 63V 10 T amp R RAD 2 1 4W 108 5 2 U T amp R RES RELAY 1A 16AMP DC48 011MA PC C 100N 10 T amp R BEAD 8 1 4W 2280 FUSIBLE T amp R RES 4 X 1 4 PAN PH TYPE A ZINC 220N 250VDC 10 CAP BLK RAD PLY FLM 1 8W 2 FLAME PROOF T amp R RES 4 40 X 5 16 PAN PH MS JS500 7710 63V 20 T amp R RAD 2EL 1 8W 398 2 FLAME PROOF T amp R RES A 4 X 3 8 FLAT QUAD JS500 BLK __ 407 63V 20 CAP T amp R 8X7MM 2EL 1 4W 3980 FUSIBLE T amp R RES 5 4 40 X 3 8 PH JS500 407 63V 20 T amp R RAD _ 2 1 4W 39R 5 T amp R RES 4 40 3 8 PAN PH MS JS500 __407 100 20 T amp R RAD LESR2 1 4W 4790 FUSIBLE T amp R RES 4 40 X 1 2 PAN PH MS JS500 gt ro 221 50V 20 T amp R RAD 2EL 1 4W 68R 5 T amp R RES 4 40 5 8 PAN PH MS JS500 D 100 16V 20 T amp R 5X7MM 2 1 4W 150R 5 T amp R RES 4 40 X 3 4 PAN PHIL MS B O amp WAX 100 160 20 BLK 10 13 EL 1 4W 1508 FUSIBLE T amp R RES 6 X 1 4 PAN PH TYPE 0 100
13. 6 RAG RE MC33078P 1 54 1 9 76 9 76 01 01 MC33078P 220 100 31 6321 2 1 68N 100 681010090 7 PIETER SW x 100V 220 5 al C7 27 28 3657_OBS 4 220 100 1 150 63V 150 63V MC33078P 9K76 0 1 r GND LIFT 00N 100V 13 5 2 c1 22N 275 M1129 Database History MODEL S P2020 4020 AP4040 AM1CE DATE VER DESCRIPTION OF CHANGE OCTIST 1 00 FIRST PRODUCTION NOVI97 2 00 SWITCH NETS RREF WITH LREF AND RSPRE WITH 3 LSPRE AT 14 PIN CONNECTOR INPUT TO NONINVERTING DEC 02 97 CHANGE C27 C29 C28 C30 TO 150N APR 16 98 PC 5694 PINS 10 12 OF MC2 CONNECTED TO BRG SWT JUL 01 98 ISOLATE PIN OF S3 SEP 06 01 PC 6436 REPLACE R119 10 0 WITH JUMPER 119 5 05 PC 6873 REDO SOLDERMASK JUL 2005 CONVERT TO PCAD2002 PC 6944 ROUTE GAUGE AUG 1 5 2005 PC 6914 ADD TARGETS D N D N M1129 sch_schematic DATABASE_HISTORY ODEL S AP4020 AP4040 AP2020 AM1CE DATE VER DESCRIPTION OF CHANGE 1997 1 00 FIRST PRODUCTION 12 97 REVERSED INPUT POLARITY MODIFIED FOR AP2020 DEC 02 97 5 C27 C28 C29 10 0 PC 5694 ADD NETS BRPRTCT LVGND 28 TO BRG SW DELETE R119
14. NYLON CABLE TIE 1 4W 9 760 0 1 T amp R RES DPDT PUSH SW PCMT H BREAK B4 MAKE MPSA92 7092 PNP TRAN T amp R SQUARE BUMPER BUTTON BLACK 1 4W 10KO 1 T amp R RES DPDT ROKR SW QUIK 250 AC PWR ON OFF 2 6517 17092 NPN TRAN STICK CABLE WRAP ANCHOR 1 4W 10K 5 T amp R RES 4P3T SLID SW PCMT H MTP1ON15L 10220 NCH MFET 8 XH HEADER 0 098 1 4W 10K 5 T amp R RES 250 MALE PCB TAB REEL MJF6668 _ 2210 PNP TRAN DARL TJ 12 XH HEADER 0 098 1 4W 10KO 1 MINIMF RES D PATCH 08 22AWG 05 0 XH MJF6388 172210 NPN TRAN DARL TJ 2 CIR XH HEADER 0 098IN 1 4W 12K 5 T amp R RES PATCH 08 22AWG 09 0 XH MJE340 T0126 NPN TRAN KNOB AP SERIES PLASTIC 1 4W 14 7 1 T amp R RES PATCH 12 22AWG 15 0 XH MJE350 T0126 TRAN FLAT GREY 1 2W 15K 5 T amp R RES ES 4040 117VAC IMPORT T RD MTP8P20 170220 PCHMFET gt n co FAN FILTER LABEL 1 4W 15K 5 T amp R RES D 1 4 X6 2 3 10PP1 FILTER FOAM 21196 NPNTRAN 8 3 16 SJT AC LINE CORD STRIP 17 1 4W 17K8 1 T amp R RES MJ21195 PNP TRANSISTOR oo STRAIN RELIEF HEYCO 1200 1 4W 18K 5 T amp R RES 2SA2121 0 PNP TRAN GE VELVET MATTE LEXAN 007 X12 X24 1 4W 20 1
15. POND BO res POWER AMP AP4040 M1146 Sheet 1 of 1 Vorlevilll Date Thu Sep 25 2008 Rev v1000 Filename M1146v1000p0sch sch2002 1 000 0 0A000 0 0x eadaypuydajs 00011 00061 3224218 ETCH GUIDE GUIDE 3628 NL4MP 1 9 bed P rez 2 ore eee gt 5 0 2 8 MOT a 2X dll AP4040 V44 YEL EY7 13917 A Da oF a 02 810 O 88 8 b HOZ 924 pr Y Be gt SCRE i 7428 5 sd gt Cyr Aes 9 8805 191 Psu raz 08002 2 Sexe 5 faxes VW 4 ORDE 5 5 A 25 a 5 s pole 8 foe a LT B lt lt a Ho 58 SA AS g Lii EEP RD 0917 91 5 SOUP frp 2 2 Da Aase sa 427 TF 0 yer Ctr 2 981 Poll g f HOST 009908 Pd Foam ae EPS su d aie rel IM DEK er A Die vseu Se DES EI lt ax 2 2 GED UGE sei 1 9 89 V95E ei eeu OEE ane
16. RESISTOR PRINTED CORRECT NUMBER VALUE MEASURED VALUE 5 5 3K08 3K25 3K41 Canada U S A Voice 905 837 8481 Voice 716 297 2920 Fax 905 837 8746 Fax 716 297 3689 www yorkville com Yorkville Sound Yorkville Sound Inc 550 Granite Court 4625 Witmer Industrial Estate i Pickering Ontario Niagara Falls New York Yorkvi l le L1W 3Y8 CANADA 14305 USA SERVICE BULLETIN SERVICE BULLETIN AP4020 amp AP4040 AP4020 amp AP4040 STEP 6 Measure across the pair of test points shown in the component Testing Repaired Circuit Boards layout listed in the table below If the measured value is not within or 10 of the value listed in the table then replace Now that you have rebuilt the M1146 or M1126 circuit board It is just as the resistors shown in the table below important to properly power up the board If the sinewave doesn t look right check the signal at test point 1 to ensure that the voltage amplifier isn t dis torting the signal If there is still a damaged part on the board instantly turn TEST LAYOUT CORRECT LAYOUT ing it on could blow up the board and you would be back where you started POINTS REFERENCE MEASUREDVALUE REFERENCE she Connect the power wires and ground to the power supply Connect a digi tal multimeter to test pins 8 and 9 to measure the bias quiescent current 10 10 R11 R12 R14 1 17ohm 190hm and place a scope probe on the speaker output B
17. aged Replace all of the red transistors that were removed point of clipping If the signal looks free of oscillation place a short across the speaker posts The amplifier should go into protect mode after 1 10 of a STEP 10 Inspect the traces on the circuit board for any that have fused second Remove the short and the sinewave will appear 6 seconds later open or looklike they got very hot Bridge and solder a piece of _ 2 wire over any damaged traces Reassemble the complete amplifier and run just clipping music or pink noise into the minimum rated speaker load for that model of amplifier Let AFTER YOU HAVE REPLACED ALL OF THE NECESSARY COMPONENTS INSPECT the amplifier heat up for 20 minutes This will check the thermal mounting of THE REPAIRED BOARD FOR ANY MISSING PARTS CORRECT VALUES IN THE COR the transistors and for any weak parts not caught during troubleshooting RECT POSITION AND THAT ALL COMPONENTS ARE SOLDERED If the amplifier passes this test the product is ready to return to the customer Canada U S A Canada U S A Voice 905 837 8481 Voice 716 297 2920 Voice 905 837 8481 Voice 716 297 2920 Fax 905 837 8746 Fax 716 297 3689 www yorkville com Yorkville Sound Yorkville Sound Inc 550 Granite Court 4625 Witmer Industrial Estate i Pickering Ontario Niagara Falls New York Yorkvi l le L1W 3Y8 CANADA 14305 USA Fax 905 837 8746 Fax 716 297 3689 www yorkville com Yorkville
18. CONVERT TO PCAD2002 100 1006 1 100 11100 56 6 NO 2 ON lt lt lt 400N 50V 100N 50V O ON gt gt gt gt gt gt gt Pes Drawing Number Titley PCB M1129 Sheet 1 of 2 7 kvill Date Tue May 02 2006 Rev v6 00 CVS Filename M1129 6v00 sch2002 98 18 ov WO 00 Ww 10 8111 W3 g C13 C24 oon ON a m 100N 216 Wh ETE LSPR Fe SELLES SU PIN SCKT 201 8986 X40 X35 X13 RREF LL os zh FILTER SW Vo 5 5 C33 44148 D4 MC33078P 4148 1 H 120K D7 R20 LINE IN RIGHT 4 1 R12 R 11 1 54 1 54 9 76 9K76 20 x a 9 76 CS GB Al 33078 R16 NIN N WY Y R13 C7 92 U4 2 lt 5 5 R23 c9 0000 6 x C12 11 5 R27 LINE_IN M1129
19. MINIMF RES 25 5949 0 NPN TRANSISTOR 4 40 5 NUT ZINC 1 4W 21 5 1 T amp R RES LM13600N XCONDUCTANCE AMP 4 40 HEX NUT ZINC 1 2W 22K 5 T amp R RES MC33078P DUAL OP 6 32 KEPS NUT TIN PLATED 1 4W 22K 5 T amp R RES MBS4992 7092 8V5 DIAC T amp R 6 32 KEPS NUT ZINC 1 4W 27K 5 T amp R RES AS35FN TO92 TEMPERATURE SENSOR 6 32 X 1 4 0 D HEX NUT ZINC CLEAR 1 4W 33K 5 T amp R RES __5 20 THERMISTOR SURGR NTC 8 SPRING 1 4W 33K 5 T amp R RES STM BTB 600BRG 10220 TRIAC 600V 5 16 18 KEPS NUT JS500 1 4W 43K 5 T amp R RES 4 35 OPTO COUPLER TO 247 THERMO CONDUCTIVE PAD 1 4W 47K 5 T amp R RES 10P 500V 5 CAP T amp R RAD 2 T0220 THERMO PAD LARGE HOLE 563598 1 4W 56K 5 T amp R RES 220P 100V 2 CAP T amp R RAD 2 TO3 SIL PAD REPLACES MICA 1 4W 62K 5 T amp R RES 47 100V 2 T amp R RAD 2 SILPAD 1500ST 0 900 0 725BERQUIST 1 4W 78K7 1 T amp R RES 100 100V 10 CAP BEAD NPO I Po LOGO HOT STAMPED ON PLASTIC GRILL 1 4W 82K 5 T amp R RES 220P 100V 10 T amp R BEAD NPO 22AWG STRAN TC WIR JMP 1 4W 91K 5 T amp R RES 470P 100V 5 T amp R RAD 2 22AWG SOLID SC
20. MPSA63 MBS4942 M1146 Database History MODEL S AP4040 DATE VER DESCRIPTION OF CHANGE FEB 12 98 JUN 19 98 JUL 4 98 SEP 10 98 JAN 27 99 JUL 08 99 AUG 12 99 OCT 12 00 AUG 28 01 SEP 18 01 MAY 03 02 BOTTOM VIEW O DERIVED FROM M1126 2 PC S767 C10 C15 C20A 2N2 PT 5427 PC 5798 R72 4167 1 2W TO 4K7 1W AD ADD 33 33u 16V ACROSS R57A R64A C30A PC 5908 2 4N35 TLP621 SPKON JACKS RE CONFIGURED CORRECT ERROR IN SPKONS PC 6278 ADD 86 17 Q41 PC 6083 REDO GND TRA PC 6429 ADD 87 18 T Q40 PC 6438 ADD R88 R89 PC 6517 Q13 gt 20 021 028 6927 gt 6910 R13 27K lt 43K C18 1N gt 220P R87 100R gt 470R PC 6607 10 15 C20A 5427 gt 5208 PC 6658 CHANGE BREAKAWAY AND ROUTE CONVERT TO PCAD2002 PC 7007 MAC 254 4 TO STM BTB 600BRG PC 7083 MTP10N15L TO IRF630NPBF HA PC 7076 REPLACE 05 6989 WITH 7004 Q6 6990 WITH 7005 hoor Updates MJL21194 MJL1302A MJL3281A MJL21193 2SA2121 0 2SC5949 0 3222822 2539 595959595595 D 20 10 151 STM BTB 600BRG MJE35 0 0 20 MJE340 O MAY 16 03 FEB 09 04N EP 2004 APR 25 06 MAY 02 06 APR 03 07 600060 CON O CO O CON Baa 0 gt gt gt gt gt
21. Sound Yorkville Sound Inc 550 Granite Court 4625 Witmer Industrial Estate i Pickering Ontario Niagara Falls New York Yorkvi l le L1W 3Y8 CANADA 14305 USA NOTE M1128 FOR R34 NAD R47 USE 4821 470R M1133 FOR R34 AND R47 USE 4808 2K LSPRE LSPOST RSIG 4 BRPRTCT 560 BC550C 7 CBE TO 92 PWN gt 2N5401 2N5551 MPSA06 MPSA13 MPSA43 MPSA56 MPSA63 EBC TO 92
22. 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 con tacts 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 Yorkville 550 Granite Court Pickering Ontartio CANADA L1W 3Y8 4625 Witmer Industrial Estate Niagara Falls New York USA 14305 Yorkville Sound http www yorkville com FIGURE 4 AP4040 Fan Current waveform 05 0001 measured voltage across R230 with 12VDC across the fan 4625 Witmer Industrial Estate Niagara Falls New York USA 14305 SERVICE MANUAL If prolonged current limiting occurs on the amplifier s output transistors then D204 or D205 depending on which channel is current limiting will be forward biased turning on Q202 from its off state Now 144VDC appears on the collector of Q202 and through R210 and R211 turn on Q203 therefore turning off Q201 by shorting its base emitter junction Q201 turning off will turn the relay off and the normally closed contacts off state will short the
23. outputs of the voltage amplifiers to ground so as not to continuously stress the amplifiers 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 dri ving 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 termi nals has been removed then the amplifier will continue to operate normally The third operation that the relay provides is overheat shutdown If for some rea son the fan cannot keep the heatsinks in a safe operating temperature area then the fan control circuit on board M1147 will deliver through D207 a positive current to 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 nor mal operation Anytime the relay is in the protect mode due to the abnormal states then contact pin 4 of the relay will illuminate LD3 the protect LED on the front panel Soft On Circuit To reduce
24. sch_schematic DATABASE HISTORY M1129 DRILL HISTORY MODEL S AP4020 AP4040 AP2020 AM1CE MODEL S AP2020 AP4020 AP4040 AM1CE DATE VER DE N OF CHANGE 171997 use DATE VER DESCRIPTION OF CHANGE NOV 12 97 DEC 02 97 APR 22 98 FIRST PRODUCTIO 057 EASED INPUT POLARITY OR APARAN CONVERT PCAD2002 PC 5694 ADD NETS BRPRTCT LVGND 28 5 D N DELETE R119 CONVERT TO PCAD2002 ON SEP 06 01 O NOU RON 1 lt lt lt lt lt lt lt 56 N M1129 Database History N N TE 2020 AP4020 4040 AM1CE M1129 PRODUCTIO 0 5 ES VERS DESCHIPTION or CANGE 1 FOR XLR 3657 USE SCREW PT 8829 UP THROUGH THE BOTTOM NOVI97 2 00 SWITCH NETS AREF WITH LREF AND WITH io 2 FOR M1129B VX1200 2400 J 2402 DO NOT STUFF X40 AND X41 DEC 02 97 CHANGE C27 C29 C28 C30 TO 150N APR 16 98 PC 5694 PINS 10 12 OF MC2 CONNECTED TO BRG SWT ADD WIRES IN BOARD ASSEMBLY JUL 01 98 ISOLATE PIN OF S3 SEP 06 01 APR 15 05 JUL 2005 PC 6436 REPLACE EBL AGI WITH JUMPER X119 PC 6873 REDO SOLDER CONVERT TO PCAD2002 PC 6944 ROUTE GAUGE Ne ADD TARGETS UG 15 2005 lt lt lt M1129 PENDING CHANGES MODEL S AP2020 AP4020 AP4040 AM1CE PC PENDING CHANGE IMPLEMENTED CHANGES INTO BOARD HISTORY 6880
25. 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 func tion When the power switch is turned on the current that initially flows through the pri mary 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 con tacts short across the surgestors so that they are not stressed by the current flowing through them under normal operation A circuit consisting of Q240 Q241 C215 and the associated resistors provides the time delay for the turn on cycle of the relay The circuit is very similar to the shutdown time delay circuit Refer to the section on the shutdown circuit for a circuit description Fan Circuit Looking at the schematic to board M1147 here is a quick explanation of the fan control circuit There is a temperature sensor AS35 on each M1146 board When the amplifier is first turned on Q207 and 0208 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 devel op a higher voltage across it s associated 8K2 resistor The higher voltage will forward bias D2
26. 0 MJE350 Q19A 6874 T0126 220 50 2012 247 ows gt c7 3300 25 1N750ARL gt 1 5 200 4 D4 12 cai 22N Toov 22N 4148 MJ21195 MJ21195 MJ21195 MJ21195 022 Q24 Q26 Q28 100 160 6910 2SA2121 0 GR TOS Function Function Function Function DIE D19 cia Me D16 220 250V pi gt gt 54 MR854 MR854 MJ21195 MJ21195 121195 121195 21 Q23 025 027 407 53V TO 92 6478 vec Function cAS35FNOUT 1Wo 4 6910 1N47a5A 60 Function Function Function Function 220P 200v 100 63V 20 MTP8P20 12 0220 5925 Function Function 6517 cis l ane HY 1007 STM BTB 600BRG Voltage 6880 6880 N35 4835 Le OWS 2011 220 750ARL 74 7 10U 16V MBS4992 2N5401 2N5551 2N6517 MPSA13 MPSA43 BC550C MPSA56 BC560C
27. 12 or D218 reverse biasing the cooler temperature sensor s diode so that the hotter sensor will control the fan speed At 40 degrees there 125 170 Yorkville 550 Granite Court Pickering Ontartio CANADA L1W 3Y8 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 pro viding 7 DC volts to the fan Further heating the temperature sensors results in a larger DC voltage across the fan To lower the dissipation of Q207 D215 D216 ZD205 ZD206 and R226 turn off Q207 and Q208 when the full wave rectified voltage present of the col lector of Q207 reaches approximately 58V by robbing current from the base of Q208 The maximum fan voltage is 20 5 VDC ZD207 and R228 R229 and R230 provide a cur rent limiting function Figure 4 shows the current through these resistors when there is 12VDC across the fan 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 volt age on the emitter of Q210 rises until at 85 degrees Celsius on the M1146 heatsinks The voltage on the emitter of Q210 reaches 18 85 degrees C VDC and the amplifier must be shutdown to protect the output power transistors ZD202 and D207 become forward biased and 0203 turns on turning the relay off and muting the audio signal After the amplifier coo
28. 12 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 along with R10 R28 C29 and C30 and C34 The gain is 1 0dB in the passband above 100 2 The audio signals from the input board M1129 pass through the 14 conductor cable to board M1128 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 ee left channel of the circuit is explained Refer to the schematic of M1128 as the sections of the circuit are explained The audio signal out of M1129 passes through volume control P2 and the desired level enters U2 through pin 6 U2 is set for a gain of 5 14dB when the volume control is in the fully clockwise position The AP4040 s defeatable limiter is built around LD8 108 is 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
29. 2 1 4 PAN JS500 1 4148 75V 0A45 DIODE T amp R CLIP 250X032 18 22AWG RIGHT ANGL gt 1 4W 62008 5 T amp R RES 10 32 X 1 2 QDX PH TAPTITE JS500 854 400V DIODE FASREC CLIP 250X032 22 18AWG DISCO LOK 1 4W 6808 5 T amp R RES 10 16 X 5 8 TYPE B HEX W SLOT JS500 1 4747 201 0 1W0 ZENER 5 T amp R CLIP 250X032 18 22AWG DISCO INSL 1 4W 1K 5 2 0 T amp R RES 5 16 18 X 3 GRD 5 HEX BOLT JS500 1 5248 18 0 5 ZENER 5 T amp R CLIP 250X032 14 16AWG DISCO INSL 1 4W 1K 5 T amp R RES a 14 PIN SCKT CLOSED FRAME DIP ONLY 1 5257 331 0 5 ZENER5 T amp R RING TERMINAL 16AWG WIRE amp 8 SCREW 1 4W 1K2 5 T amp R RES 11 64 NYLON SPACER MICRO PLASTIC 1852258 3V0 OW5 ZENER 5 T amp R RED LEFT BLACK RIGHT BIND POST 5 1 4W 1 5 5 MINI T amp R RES 10 32 X 1 4 SPACER PHENOLIC 1N750ARL 4V7 OWS ZENER 5 T amp R RED RIGHT BLACK LEFT BIND POST TPP5 1 4W 1K54 1 T amp T RES SNAP IN 5 16 SPACER RICHCO 1 5242 12V0 5 ZENER 5 T amp R 1 4 JCK PCB MT HORZ SLIM W SCREW 1 4W 2K 5 T amp R RES SNAP ON 0 5 SPACER 1N5240BRL 10V0 5 ZENER 5 T amp R SPKON 4C PCB MT VERT 250TAB GRY 4 1 4W 2K 5 T amp R RES 1 2 PCB PLASTIC SPACER 1N5251BRL 221 0 OW5 ZENER5 T amp R 6 32 SCREW TERMINAL PC MNT SNAP IN 1
30. 4W 2 2 5 T amp R RES 1 2 PLASTIC HEX SPACER 4 1 5250 201 0 5 ZENER5 T amp R XLR FEML PCB MT HORZ NO SHELL n 1 4W 5 T amp R RES 6 32 X 3 8 HEX SPACER ALUMINUM 1N4745A 16 0 1WO ZENER 5 T amp R n A gt o n s n EYELET SMALL 0 089 OD PLATED 1 4W 3 63 5 T amp R RES 3MM 103 2 OD7 0MM THICK SMM 1 5246 161 0 5 ZENER 5 T amp R FAN 80MM X 80MM 40 12VDC 1 4W 3163 596 T amp R RES SHOULDER WASHER SWS 229 LENGTH 1 8 550 92 NPN TRAN SQUARE CUT O RING FOR AP AIR FILTER 5 0W 3K6 5 BLK RES NYLON WASHER 8 0 062 805600 92 PNP TRAN T amp R AP SERIES AIR GRILL BLACK PLASTIC 1 0W 4K7 5 T amp R RES vj gt 3 4 OD X 3 8 ID X 080 THICK WASHER 5 06 TO92 NPN TRAN T amp R AP SERIES PLASTIC HANDLE PAIR 1 4W 4K7 5 2 U T amp R RES 6 FLAT WASHER NYLON MPSA13 TO92 NPN DARL T amp R TA AAVID 5972 B H S W TAB B O 1 4W 4 7 5 MINI T amp R RES 6 SPLIT WASHER ZINC MPSA63 17092 PNP DARL T amp R B52200F006 COMP WASH 4 SMALL 1 4W 7K5 5 T amp R RES 10 INT TOOTH LOCKWASHER 2N5401 TO92 PNP TRAN T amp R TA NYLON SECUR A TACH MINI PLASTIC TIE 1 4W 8 2 5 T amp R RES NYLON FLAT WASHER OD 1581D 110H 070 5 42 17092 NPN TRAN T amp R 4
31. ARKED 2 AND 3 ARE BENT FLAT AGAINST THE COPPER SURFACE 8 TAB WIRE COLOURS TAB 1 RED 16AWG TAB 2 YEL 16AWG TAB 16AWG 4 WHT 16AWG TAB 5 BLU 16AWG 6 OUTPUT TAB 7 OUTPUT 9 Q31 IS HAND INSERTED AND BENT OVER WITH FLAT SIDE UP AS SHOWN 10 MOUNTING HARDWARE FOR Q15A AND 16 8701 4 40 HEX NUT 3896 OS 8865 4 40 SCREW 11 CHECK THE TRANSISTORS FOR ANY SHORT 12 FOR CONNECTOR W1 USE YSPART 2328 TO PLACE THE CONNECTOR BEND RESISTOR R55A TO THE LEFT SO THAT THE CONNECTOR SITS FLUSH AGAINST THE BOARD 4 SEE LAYOUT DIAGRAM 45 2N5401 M1146 Database History 2 5551 M1146 SCH_DATABASE_HISTORY MOD AP4040 V44 2N6517 MOD AP4040 DATE VER DESCRIPTION OF CHANGE MESA DATE VER DESCRIPTION OF CHANGE 2 JUN19 98 110 PO 5767 G10 C15 C20A 2N2 TO PT 5427 535 MBS4942 805500 pease 5 LRO TR C15 560 3 1 20 PC 5798 872 4K7 1 2W 4K7 1W MPSA63 2 D V oe 4 SEP 10 98 2 00 PC 5806 ADD 33R 33u 16V ACROSS R57A R64A C30A 4 N 5 R72A C31A R71A 5 6 JAN 27 99 3 00 PC 5908 U1 U2 4N35 TLP621 6 7 JUL 08 99 200 SPKON JACKS RE CONFIGURED 7 8 AUG 12 99 5 00 CORRECT ERROR SPKONS 8 D 9 12 00 6 00 PC 6278 ADD R86 C17 041 PC 6083 REDO GND TRA OUT N C 9 D V N 10 AUG 28 01 7 00 PC 6429 ADD R87 C18 040 a
32. JUL 15 98 2 PC 5798 REPLACE 20212 WITH JUMPER D 5 43 OCT 27 99 3 00 PC 5695 ADD 9 10 ENLARGE ACES D 550 MPSA56 APR 03 00 4 56022216 UPDATE SYMBOL HOLE LOCATIONS D BC560C lt DEC 04 01 5 REPLACE JUMPERS FOR BRIDGE WITH TABS AND D 15 02 6 NEW SOLDERMASK FOR TABS D CONVERT PCAD2002 D REDO AC FOR COMPLIANCE D Imported test node locations from MD databas D V CHANGED ROUTE FILE FIX SPACING SNAPIN CLOSE D CHANGE C213 FROM 470U 25V 45018 To 4700 63V 56 D E date corrected ONLY LOR VAA CHANGE R201 A R201B R202 X8012 PENDING CHANGES 092 92 TO 221D R202B FROM 10K0 TO 5057 16K5 1 1 4W 5 AP4040 AND V44 CREATED X8012 FOR NEW CABLES PC 7717 and 7738 PC 7885 Span change on X30 X35 PENDING CHANGE E Change C203 C215 from 5259 to 5269 GG h N OONOUOUPOUONS OONOURWN lt lt lt lt lt lt lt IMPLEMENTED CHANGES INTO BOARD HISTORY
33. UN 05 06 6 00 PC 7138 GT CONVERT TO PCAD2002 CHANGE PAU AND ANT V4 MPSA13 11 LIMITER TO 13600 6745 LIMITERS FOR ROHS ____ PENDING CHANGE 161514131211 10 9 Bcs50c MPSA43 1 REPLACE C3 C4 C9 AND C10 WITH 5234 470N 63V 550 MPSA56 1 REPLACE R31 AND R51 WITH 6139 62K 1 4W 805606 MPSA36 1 X 2 Removed shear solder update std board size x 3 CREATE X8011 M1128 FOR AP VX AND M1133 FOR X 1 4 BC 7717 7718 1133 42 AND V44 CHANGE R34 X rom TOSE HSS PLACE IMPLEMENTED CHANGES INTO BOARD HISTORY 8 D 4 CBE EBC TO 92 8 TO 92 11 D 12 D 13 D U3 A gt 23 3307 16 2 33078 c9 220P 11100 C34 FILTER SW CH 9 76 9K76 68N 100 J1 LINEXLR 30 150 63 MC33078P c10 220P 100V 1 R24 0 1 220 100 220 100 6121 LIMITER MONO STEREO BRIDGED S3 B 3705 MONO STEREO BRIDGED WR RIA 53 6 53 0 3705 MONO STEREO BRIDGED 3705 MONO STEREO BRIDGED MC33078P C24 100 220 3307 16V
34. WER ON LEDS 2x XLR 2x 1 4 phone TRS 2x Binding Post 3x Speakon SP 4 lt 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 servo controlled fan in front out rear DWH 44 cm x 48 cm x 9 cm front panel to binding posts DWH 17 5 in x 19 in x 3 5 in Two rack spaces 43 5 pounds 19 8 Kilograms Yerkville 550 Granite Court Pickering Ontartio CANADA L1W 3Y8 4625 Witmer Industrial Estate Niagara Falls New York USA 14305 5 SERVICE BULLETIN Quick Fix for M1146 amp 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 compo nents most likely to fail when a M1146 amplifier board requires service This Quick Fix kit contains the procedure assembly drawings and compo nents 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 pro cedure 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 the procedure for the appropriate circuit board version number A complimentary service manual for the AP4020 power amplifier is sup plie
35. WIR T amp R JMP 1 4W 100K 5 T amp R RES __2 400V 5 T amp R RAD 2FLM D 24AWG SOLID SC WIR RAD JMP 1 4W 100K 5 T amp R RES __1 5 200V 5 CAP T amp R RAD 2 5 0W OR1 5 BLK RES 1 4W 120K 5 T amp R RES 470P 10 T amp R BEAD NPO 5 0W OR15 5 BLK RES 1 4W 200K 5 T amp R RES LIN 10 T amp R BEAD NPO 1 0W 0847 5 FLAME PROOF T amp R RES 2 0W 220K 5 10MM BODY T amp R RES A __4 7 250V 5 T amp R RAD 2FLM ro 1 0W 18 5 PROOF T amp R RES 1 4W 220K 5 T amp R RES 5 225 100V 10 T amp R RAD 2FLM 1 2W 1R 5 T amp R RES 1 4W 470K 5 T amp R RES 250V 20 RAD POLY FLM 1 2W 282 5 T amp R RES 1 4W 1M 5 T amp R RES 225 275V 20 BLK X2 15MM 1 4W 282 5 T amp R RES 1 4W 1M 5 2 U T amp R RES __4 7 250V 20 CAP BLK Y 10MM 2 0W 389 5 T amp R 1 4W 4M7 5 2 U T amp R RES 100N 63V 5 T amp R RAD 2FLM 5 0W 5R6 5 BLK RES 1 4W 8 2 5 T amp R RES 68N 100V 5 T amp R RAD 2FLM 1 4W 10R 2 FLAME PROOF T amp R RES 1 4W 22M 5 T amp R RES 1008 100V 5 T amp R RAD 2FLM 1 4W 108 FUSIBLE T amp R RES STAR RING TERMINAL 14 16AWG 10SCREW 150N 63V 10 T amp R RAD
36. ately 12VDC 2nd TIER VOLTAGE derived from the voltage drop across ZD4 We COLLECTOR OF 914 call this voltage the floating battery because it floats on top of the output audio signal with test eee point 4 always being 12VDC greater than the peak of the output signal Test point 4 drives the SIGNAL ON 10 gate of mos fet Q11 Q11 controls the transis tors 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 SIGNAL ON TE 7 output signal is about 69 5vp 78 12 3 5 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 dri ving an 8 ohm load Zener ZD8 protects the gate source junction of Q11 and also pro vides a supply current path through R29 for the floating battery NOTE The Power supply voltages given are those when the amplifier is not driving a speaker load This will allow yo to check the tier switching with the cover of the amplifi er off and the amplifier therefore running cool Current Limit Protection Circuitry To have an amplifier drive 3000 watts into practically any combination of speaker cabi nets and know what is a safe load and
37. atus including amplifiers that produce heat No naked flame sources such as lighted candles should be placed on the apparatus Power Cord Do not defeat the safety purpose of the polarized or grounding type plug A polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wide blade or the third prong are provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet The AC supply cord should be routed so that it is unlikely that it will be damaged Protect the power cord from being walked on or pinched particularly at plugs If the AC supply cord is damaged DO NOT OPERATE THE UNIT To completely disconnect this apparatus from the AC Mains disconnect the power supply cord plug from the AC receptacle The mains plug of the power supply cord shall remain readily operable Unplug this apparatus during lightning storms or when unused for long periods of time Service The unit should be serviced only by qualified service personnel Servicing is required when the apparatus has been damaged in any way such as power supply cord or plug is damaged liquid has been spilled or objects have fallen into the apparatus the apparatus has been exposed to rain or moisture does not operate normally or has been dropped d instructions importantes dans la litt rature accompag nant l appareil en ce qui co
38. c 10 D 11 SEP 18 01 8 00 PC 6438 ADD 888 889 U1 U2 IRF830 10 92 ERE 11 D 12 MAY 03 02 8 10 PC 6517 Q13 gt 20 6900 gt 6909 021 028 6927 gt 691 MTP12P10 92 12 D 13 R13 27K lt 43K C18 1N gt 220P R87 100R gt 470R 13 D N 1 8 20 6607 C10 C15 C20A 5427 gt 5208 12910 MJL21194 2 8 30 PC 6658 CHANGE BREAKAWAY AND ROUTE 3 9 00 CONVERT TO PCAD2002 1925210 MJ21195 4 9 10 PC 7007 224 4 TO STM BTB 600BRG MTP2P50E 80237 MJL3281A 5 9 20 PC 7083 MTP10N15L TO IRF630NPBF MTP8P20 MJL21193 MJ21196 6 9 30 0 6 REPLACE Q5 6989 WITH 7004 IRF720 BD238 BF872 2SA2121 0 8 10 00 Solder Updates MTP23P06 ESD Secs oS 25 5949 0 3 VOIN IRF822 MJE271 26583 9 O 1 IRF4905 MJE270 1 BD140 1 D BOTTOM eal j BCE 913 1 2 3 4 5 6 7 8 9 1 1 1 1 V N V V V V V V V V V V V 0000000000 C1 22N 214 220P 100V R203A 1 174 LNFB 10 0 1 MINI was a i2 PRTCT 3 78V lt ES 2 519 C201A R201A 2 amp e was c 12 Hour 330 16 165 DPDT Switc
39. ction 7 afi MC33078P 8 7 2 R44 9 TAN U2 B 12 1 1 C38 RSIG 12 1 220P 100 2 W1 K LREF 1 asic AN LIMABLE sek e 4 2 E op TS 18V 18 gt 9 3 SAYS pers 2 Q3 2 2 5102 52 gt Oslin 02 gt CNP 5 2 og SZ R39 R8 D9 27 ark MPSA13 0 TAW AW 2 22M TAW 100K c21 Q1 AN 4148 4 7 55 220N v 17 5105 R54 1094 2 7 17877 15K A14 58 15K EE 3 AW FIVE 14W 9 R59 12 15 2498 R62 2 LM13600N 13 R37 MINI R65 avy 5 5 RREF R64 o 47 TAW als RO 8 22 15K AS ROT 18K ah 4 5 TAW T 4W SEXY 85 5 52 ae LM13600N 4 REO LVGND RREF 18V 18V RSPRE R46 c40 c18 RSPOST vec veo JAW 00V 27 100 LM13600N LM13600N MINI n U3 D U4 C ed 6745 6745 40K 13 yt hoon Dual VCA Dual VCA 4 AUD U2 C 5 i Function Function 4390 B40 R42 l al 1 a t 33U 16V 14K7 vec vec Function LM13600N LM13600N 03 04 0 4 i 6745 6745 Dual VCA Dual VCA 18 TAN 2281 Function Function TK 1 100 100N C37 5 U2 A 63 5 RREF LVGND LVGND
40. d with RT1 RT1 causes 1 to turn on slightly more or less resulting in Q5 and Q40 turning on slightly more or less and therefore R12 voltage will be slightly more or less than 0 5v The proper quiescent current voltage is 4mV to be measured between test points 8 and 9 The Second Tier and Tier Switching Refer to the simplified schematic Fig 1 while reading the following text One way of making an amplifier more efficient is to vary the Power Supply Voltage on the collec tors of the output transistors Q14 amp Q22 The lower the voltage from collector to emit ter 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 amplifiers output is approximately 139V peak How an output transistor deliver 139V peak when its collector is only at 78VDC It can if its collector is pulled up to 144VDC as the output signal s peak rises above 78VDC Refer to Fig 2 The second tier voltage must remain above the amplifiers output voltage by amount Vm Therefore the circuitry controlling the second tier voltage must increase the tier voltage before the amplifier s output voltage reaches 78VDC This leading voltage is necessary to compensate for time lag of the second tier circuit during fast rising amplifier output signals FIGURE 2 2ND TIER VOLTAGE The voltage between the amplifiers output and test point 4 is approxim
41. d with this M1146KIT STEP 1 Locate the assembly drawing for the version number printed on the M1146 or M1126 circuit board to be serviced STEP 2 Remove all of the transistors coloured RED on the assem bly drawing STEP 3 Measure and remove any of the diodes coloured BLUE on the assembly drawing that may be damaged Replace a 1N4732A 1W 4 7 zener 6459 2012 along with a series 0 5 ohm R85 resistor STEP 4 Rotate the trim pot RT1 fully counter clockwise as in figure 1 Inspect and replace any resistors that look burnt Measure all of the resistor values coloured YELLOW on the assembly drawing The value that you measure may not be exactly what is shown on the assembly drawing but if the resistor doesn t look dam aged it should measure within or 5 of the printed value Canada U S A Voice 905 837 8481 Voice 716 297 2920 Fax 905 837 8746 Fax 716 297 3689 www yorkville com Yorkville Sound Yorkville Sound Inc 550 Granite Court 4625 Witmer Industrial Estate i Pickering Ontario Niagara Falls New York Yorkvi l le L1W 3Y8 CANADA 14305 USA SERVICE BULLETIN AP4020 amp AP4040 ROTATE FULLY COUNTER CLOCKW Figure 1 STEP 5 Measure the resistor coloured GREEN The measured value should measure within 5 value listed in the table below Replace any resistor that measured beyond the or 5 value listed in the table below
42. e sure to turn the quies cent current trimpot RT1 fully counter clockwise Now using a variac slowly turn up the AC main voltage while monitoring STEP 7 Measure the resistors coloured ORANGE Since the value of the quiescent voltage and the speaker output trace on the scope Watching these resistors is 0 1 ohm your ohmmeter will measure the these two test points is a good indicator of the health of the board If you higher series resistance of the test leads if the resistor is OK If have a second multimeter connect it up from the speaker output to test the resistor is damaged your ohmmeter will read a very high point 4 or 5 As you variac up also check these DC battery voltages to resistance an open circuit Replace any damaged resistors ensure that they both increase in voltage to approximately 12 or 12 STEP 8 Measure the output 10 3 transistors Q13 to Q28 to deter If the board looks OK after variacing up to 120 then slowly turn up the mine if any arg damaged Mark any damaged transistors with bias RT1 trimpot to obtain 3 to 5 millivolts of bias voltage on test points 8 a marking pen and 9 Check the speaker output with a 1KHZ sinewave with no load If this STEP 9 Replace any output transistors that you have marked as being looks good place the minimum rated load 4 Ohm for M1126 2 Ohm for damaged Replace any diodes that you have found to be dam M1146 on the speaker output and increase the sinewave amplitude to the
43. ed to 30mA through the clamping action of 19 D20A 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 Yorkville 550 Granite Court Pickering Ontartio CANADA L1W 3Y8 4625 Witmer Industrial Estate Niagara Falls New York USA 14305 Yorkville Sound http www yorkville com Schematic 1 4625 Witmer Industrial Estate Niagara Falls New York USA 14305 SERVICE MANUAL Reg gee 013 fE u 1790 SPEAKER 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 simplici ty 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 T
44. es Des pr cautions doivent tres prises afin d eviter que le syst me de mise la terre de l appareil ne soit d sengag Un appareil construit selon les normes de CLASS devrait tre raccord une prise murale d alimentation avec connexion intacte de mise la masse Lorsqu une prise de branchement ou un coupleur d appareils est utilis e comme dispositif de d branchement ce dispositif de d branchement devra demeurer pleinement fonctionnel avec raccordement la masse Risque Ne pas placer cet appareil sur un chariot un support un tr pied ou une table instables L appareil pourrait tomber et blesser quelqu un ou subir des dommages importants Utiliser seulement un chariot un support un tr pied ou une table recommand s par le fabricant ou vendus avec le produit Suivre les instructions du fabricant pour installer l appareil et utiliser les accessoires recommand s par le fabricant Utilisez seulement les attachements accessoires indiqu s par le fabricant Note L utilisation prolong e des couteurs un volume lev peut avoir des cons quences n fastes sur la sant sur vos oreilles Il convient de pas placer sur l appareil de sources de flammes nues telles que des bougies allum es Lappeil ne doit pas tre expos des gouttements d eau ou des claboussures et qu aucun objet rempli de liquide tel que des vases ne doit tre plac sur l appareil Assurez que lappareil est fourni de la propre venti
45. extension cord or receptacle unless the plug can be fully inserted Precau tions should be taken so that the grounding scheme on the unit is not defeated An apparatus with CLASS construction shall be connected to a Mains socket outlet with a protective earthing ground Where the MAINS plug or an appliance coupler is used as the disconnect device the disconnect device shall remain readily operable Hazards Do not place this product on an unstable cart stand tripod bracket or table The product may fall causing serious personal injury and serious damage to the product Use only with cart stand tripod bracket or table recommended by the manufacturer or sold with the product Follow the manufacturer s instructions when installing the product and use mounting accessories recommended by the manufacturer Only use attachments accessories specified by the manufacturer Note Prolonged use of headphones at a high volume may cause health damage on your ears The apparatus should not be exposed to dripping or splashing water no objects filled with liquids should be placed on the apparatus Terminals marked with the lightning bolt are hazardous live the external wiring connected to these terminals require installation by an instructed person or the use of ready made leads or cords Ensure that proper ventilation is provided around the appliance Do not install near any heat sources such as radiators heat registers stoves or other appar
46. g the quiescent current with a meter and the speaker output with an oscilloscope Watch the speaker output for large DC offsets or oscilla tion Watch the meter for large collector currents flowing Remember under quiescent conditions there should only be 3 to 5 millivolts across test points 8 and 9 on the out put stage of the amplifier Yorkville 550 Granite Court Pickering Ontartio CANADA L1W 3Y8 4625 Witmer Indusirial Estate Niagara Falls New York USA 14305 Yorkville Sound http www yorkville com Frequency Response Hum and Noise THD 1 khz 4 Ohms THD 20Hz 20kHz 4 Ohms High Pass Filter Slew Rate Damping Factor Crosstalk Input Impedance Input Sensitivity Rejection Controls Displays Input Connectors Output Connectors Turn On Off transients Power Consumption Transformer Protection Cooling Size Weight SERVICE MANUAL SPECIFICATIONS 1dB 20 Hz 20 KHz 103 dB below max output RMS voltage unweighted lt 0 01 lt 0 1 40Hz 12 dB octave Power amp section 25 V uS 50 V uS in bridged mode gt 600 20 Hz 20 KHz 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 4020 36 dB AP4040 39 dB gain CMRR 60Hz minimum 4808 typical 56dB Rotary GAIN controls MONO STEREO BRIDGE FILTER and LIMITER switches 2x CLIP 2x ACTIVITY PROTECT PO
47. gnal to drive 1200 watts into 4 ohms out of the binding posts Before the circuit is described in detail here is a quick rundown on the signal s path through the voltage amplifier stage Refer to the schematic of M1146 Let s consider that a positive going AC signal is present at the SIG input The positive going signal will turn on the positive side of the voltage amplifier The signal at the SIG input turns on Q12A through R40A D14A and D13A The collector of Q12A pulls down on the base of Q14A turns this transistor on further and allows a greater current to flow out of Q14A s collector This increase in current passes through Q15A and it s collector to emitter voltage decreases The collector of Q15A now being more positive in voltage turns the base of Q18A on causing an increase in Q18A s collector current resulting in test point 1 going positive As the positive side of the amplifier was turning on the negative side would have been turning off This is how test point 1 was able to move positive following the input signal The reverse would hold true if a negative going signal were present on the input of the voltage amplifier Yorkville 550 Granite Court Pickering Ontartio CANADA L1W 3Y8 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 circu
48. h LOSIG 2 1 25 1 w35 D 2 ETT R202A 3 2 1 4W 201 Thermal Breaker 0 0 W35 E 2 5 VEN 16K5 120 2 1 4 3 R204A BLACK O O 0 6 1 4W LOG 51 52 8 12 18V 5 5 wase 7 C214B T 02 16V w35 H 2 8 RE 220P 100 I 9 R203B 5 12 14W RNFB 10 C201B R2016 TAK 5 412 218 TeV 14W 3 5 IGND ji o2 Pee 3 2 5 01 smioz NS 12 6 5 was 72 12 MC33078P
49. he nega tive 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 turns on Q5 and 040 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 Yorkville 550 Granite Court Pickering Ontartio CANADA L1W 3Y8 Yorkville Sound http www yorkville com 144 0 78 0C 78 144 0 SERVICE MANUAL This causes 040 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 accom plishe
50. inating the activity LED whenever the audio signal increases in ampli tude A constant current flows through R55A R55B and when 1 is off the collector current then flows through D1 From M1128 the audio signal passes through a 12 conductor ribbon cable to circuit board M1147 On M1127 an operational amplifier U201 re references the ground for the audio sig nal 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 out put 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 off set 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 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 6 8 volts peak at the output of U201 to approximately 98v peak which is required to drive the current amplifier section The current amplifier provides the current required for the 98v peak si
51. int rieur d un triangle quilat ral Ce symbole d clair avec t te de fl che dans un triangle RISQUE DE CHOC AE ARE 5 est pr vu pour alerter l utilisateur de la pr sence quilat ral est pr vu pour alerter l utilisateur de la pr sence d un voltage dangereux non isol proximit de du produit qui pourrait tre d ampleur suffisante pour pr senter un risque de choque lectrique a FOLLOW ALL INSTRUCTIONS Instructions pertaining to a risk of fire electric shock or injury to a person CAUTION TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER OR BACK NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL Read Instructions The Owners Manual should be read and understood before operation of your unit Please save these instructions for future reference and heed all warnings Clean only with dry cloth Packaging Keep the box and packaging materials in case the unit needs to be returned for service Warning To reduce the risk or fire or electric shock do not expose this apparatus to rain or moisture Do not use this apparatus near water Warning When using electric products basic precautions should always be followed including the following Power Sources Your unit should be connected to a power source only of the voltage specified in the owners manual or as marked on the unit This unit has a polarized plug Do not use with an
52. itry connected to the nega tive 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 col lector and the emitter resistor R44A Transistor Q12A drives the base of Q14A through the resistor chain A DC current of approximately 4 mA should flow through the collector of Q14A The voltage drop across Q14A remains constant and is derived from the voltage drop across the voltage reference Q20A resistor R58A and the base emitter junction of Q15A This total volt age 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 sig nal from coming within 4V of the 144 VDC rail This is to prevent the output current amplifier from going into saturation during clipping and therefore having storage delay problems Transistor Q18A buffers the high impedance present on the collector of Q15A The output of the buffer provides a low output impedance at the junction of R61A and R62A and is current limit
53. lation Ne proc dez pas l installation pr s de source de chaleur tels que radiateurs registre de chaleur fours ou autres appareils incluant les amplificateurs qui produisent de la chaleur Les dispositifs marqu s d une symbole d clair sont des parties dangereuses au toucher et que les c blages ext rieurs connect s ces dispositifs de connection ext rieure doivent tre effectiv s par un op rateur form ou en utilisant des cordons d j pr par s Cordon d Alimentation Ne pas enlever le dispositif de s curit sur la prise polaris e ou la prise avec tige de mise a la masse du cordon d alimentation Une prise polaris e dispose de deux lames dont une plus large que l autre Une prise avec tige de mise la masse dispose de deux lames en plus d une troisi me tige qui connecte a la masse La lame plus large ou la tige de mise la masse est pr vu pour votre s curit La prise murale est d su te si elle n est pas congue pour accepter ce type de prise avec dispositif de s curit Dans ce cas contactez un lectricien pour faire remplacer la prise murale Evitez d endommager le cordon d alimentation Prot gez le cordon d alimentation Assurez vous qu on ne marche pas dessus et qu on ne le pince pas en particulier aux prises N UTILISEZ PAS LAPPAREIL si le cordon d alimentation est endommag Pour d brancher compl tement cet appareil de l alimentation CA principale d connectez le cordon d a
54. limentation de prise d alimentation murale Le cordon d alimentation du bloc d alimentation de l appareil doit demeurer pleinement fonctionnel D branchez cet appareil durant les orages ou si inutilis pendant de longues p riodes Service Consultez un technicien qualifi pour l entretien de votre appareil L entretien est n cessaire quand l appareil a t endommag de quelque fa on que se soit Par exemple si le cordon d alimentation ou la prise du cordon sont endommag s si il eu du liquide qui a t renvers l int rieur ou des objets sont tomb s dans l appareil si l appareil a t expos la pluie ou l humidit si il ne fonctionne pas normalement ou a t chapp safety 4v7 May 7 2008 Description RED 3MM LED 1V9 20MA 4SPCER T amp R AP4040 Parts List 3 17 2010 Description 47000 80V 20 CAP BLK 25 50 ELS Description 1 4W 270R Description 8 18 X 1 2 THRD CUTTING FOR PLASTIC GRN LED 1V9 20MA 4SPCER T amp R 10K 16MM DETENT P22 1 4W 330R T amp R RES 8 32 X 5 8 PAN PH TAPTITE JS500 BRIDGE 35A 400V WIRE LEAD 504 _10K TRIM POT 1 4W 470R T amp R RES 8 32 X 3 4 FILLISTER PHIL MS JS500 BAV21 200V 0825 DIODE T amp R 15 00 AMP CIRCUIT BREAKER 1 4W 4708 5 T amp R RES 8 32 X 3 4 PAN PH TAPTITE JS500 104007 1000V 1A0 DIODE T amp R ____4UH COIL 14AWG ZOBEL HORIZONTAL 1 4W 6208 5 T amp R RES 10 3
55. ls down the voltage will decrease until Q37 turns off turning the relay back on enabling the amplifier Identifying Defective Boards in the AP4040 STEP 1 VISUAL INSPECTION OF FRONT PANEL AND FAN e Check to see whether the green power LED is lit If not the amplifier has a power supply M1147 board transformer A C switch or line cord problem e If the red protect LED stays 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 e If the fan is running at full speed at power up this usually indicates a problem with the fan circuitry on the M1147 board but it can also be caused by M1146 cir cuit problems A damaged AS35 temperature sensor located under the M1146 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 monitorin
56. ly be seen by using an oscilloscope to measure differentially across R52 and R53 The conditions of the measurement are contained on the diagram During cur rent 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 209 and R42 to below 16 6 volts Q8 turns off allowing a charge to build up on C8 through resistors R24 and R25 If current limiting occurs for a long enough duration to allow C8 to charge to 1 2 volts then Q7 will turn on tripping the relay circuit on board M1147 As soon as the relay is tripped the audio signal will be 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 amplifiers output are safe for the amplifier When a safe load appears the ampli fier will automatically reset and drive that load the speaker cabinet DC Protection If a DC voltage greater than 8 volts appears on the output of the amplifier for more than 200 milliseconds then triac Q30 will turn on holding the output at ground poten tial MBS4992 is a device that turns on at either or 8 volts DC AP4040 curre
57. ncerne l op ration et la maintenance de cet appareil 52125 SUIVEZ TOUTES LES INSTRUCTIONS Instructions relatives au risque de feu choc lectrique ou blessures aux personnes AVIS AFIN DE REDUIRE LES RISQUE DE CHOC ELECTRIQUE N ENLEVEZ PAS LE COUVERT OU LE PANNEAU ARRIERE NE CONTIENT AUCUNE PIECE REPARABLE PAR L UTILISATEUR CONSULTEZ UN TECHNICIEN QUALIFIE POUR LENTRETIENT Veuillez Lire le Manuel contient des informations qui devraient tres comprises avant l op ration de votre appareil Conservez Gardez S V P ces instructions pour consultations ult rieures et observez tous les avertissements Nettoyez seulement avec le tissu sec Emballage Conservez la boite au cas ou l appareil devait tre retourner pour r paration Avertissement Pour r duire le risque de feu ou la d charge lectrique n exposez pas cet appareil la pluie ou l humidit N utilisez pas cet appareil pr s de l eau Attention Lors de l utilisation de produits lectrique assurez vous d adh rer des pr cautions de bases incluant celle qui suivent Alimentation L appareil ne doit tre branch qu une source d alimentation correspondant au voltage sp cifi dans le manuel ou tel qu indiqu sur l appareil Cet appareil est quip d une prise d alimentation polaris e Ne pas utiliser cet appareil avec un cordon de raccordement moins qu il soit possible d ins rer compl tement les trois lam
58. nt limiting into a shorted output FE CRETE 22 yf Yorkville 550 Granite Court Pickering Ontartio CANADA L1W 3Y8 Yorkville Sound http www yorkville com SERVICE MANUAL NOTE Every time you replace blown output transistors on a M1146 board test the DC protection triac with the following circuit Conditions of test A Pass a 100 2 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 pro tect mode as the triac if working shorted the output of the amplifier to ground and the amplifier goes into current limit C Disconnect the triac test circuit and allow the amplifier to complete it s protect cycle D Reverse connections 1 to 2 and 2 to 1 and test again The same results as in B should be observed if the triac is working Only test the triac for one protect cycle as prolonged testing will heat the triac to a high temperature _ BATTERY TRIAC CIRCUIT UNDER TEST M1147 SHUTDOWN CIRCUIT FAN CONTROL CIRCUIT and SOFT TURN ON CIRCUIT 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
59. parts provide the attack and release time constants of the limiting function along with the drive currents for the clip LED and the LED inside LD8 When an audio signal on the output of the power amplifier section on board M1146 enters clipping pulses representing the duration of the clipped portion appear at LCLIP These pulses turn on transistor Q6 and Q6 provides current pulses to turn on clip LED LD6 The pulses also pass through R7 and D6 to charge C3 and C36 When the voltage across reaches 0 5 volts then Q5 turns on providing a cur rent into the LED of the LD8 limiting the audio signal at U2 The charging attack and discharging release times of the limiter are 80 5 and 3 5 seconds respectively Resistors R50 and R7 provide the charging path and resistor R51 provides the dis charge 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 Yorkville 550 Granite Court Pickering Ontartio CANADA L1W 3Y8 M Witmer Industrial Estate Niagara Falls New York USA 14305 4625 SERVICE MANUAL 4625 Witmer Industrial Estate Niagara Falls New York USA 14305 Yorkville Sound http www yorkville com SER VI CE MANUAL The activity LED circuit consists of Q1 and the surrounding circuitry The audio sig nal enters the activity LED circuit through R2 R2 and C21 form a differentiator that turns Q1 on illum
60. what is not is a very difficult task An extensive Yorkville 550 Granite Court Pickering Ontartio CANADA L1W 3Y8 4625 Witmer Industrial Estate Niagara Falls New York USA 14305 Yorkville Sound http www yorkville com FAMOS WAVE0001 orof 0 0 4625 Witmer Industrial Estate Niagara Falls New York USA 14305 SERVICE MANUAL amount of time was spent on the current limit circuitry so that it may simulate the safe operating area of the output transistors SOAR curve No matter how reactive the load may be the phase shift that it presents along with it s resistive component is used to set the output current limit of the output transistor stage Refer to the schematic of board M1146 while reading the following text The current limit circuitry is a mirrored image with circuitry connected to the positive power supply rail being identical but opposite polarity to the circuitry connected to the negative power supply rail For this reason we will look at the positive side of the circuitry Transistor 09 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 on
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