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YORKVILLE Audiopro 3400 Service Manual

High efficiency stereo power amplifier
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See also: Owner's Manual
3 400
HIGH EFFICIENCY STEREO POWER AMPLIFIER
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

SERVICE MANUAL

Quality and Innovation Since 1963
Printed in Canada
Manual-Service-AP3400-00-1v6.pdf

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Summary of Contents for YORKVILLE Audiopro 3400

  • Page 1: Service Manual

    3 400 HIGH EFFICIENCY STEREO POWER AMPLIFIER 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...

  • Page 2: Important Safety Instructions

    Conservez la boite au cas ou l’appareil devait être Lors de l’utilisation de produits électrique, assurez-vous AUDIOPRO AP-3400 SERVICE MANUAL M1012A “THE INPUT BOARD” The input board processes the audio signal from the input jacks to the voltage amplifier board, (M1011A).

  • Page 3: Circuit Description

    VOLTAGE AMPLIFIER: The voltage amplifier amplifies the audio signal?s voltage from 4.8 volts peak (at the output of U2) to approximently 97v peak which is required to drive the current amplifier board M1002A. M1002A provides the current required for the 97v peak signal to drive 1200 watts into 4 ohms out of the binding posts.
  • Page 4 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.
  • Page 5 The voltage between the amplifier?s output and test point 4 is approximately 14.7VDC derived from the voltage drop across ZD3 @ ZD4. We call this voltage the “floating battery” because it floats on top of the output audio signal with point 4 always being 14.7VDC greater than the peak of the output signal.
  • Page 6 After the amplifier cools down the kill voltage will decrease FIGURE #4 AP3400 Fan Current Waveform until Q37 turns off turning the relay back on enabling the amplifier. Identifying Defective Boards in the AP-3400 STEP 1: VISUAL INSPECTION OF FRONT PANEL AND FAN A.

  • Page 7: Specifications

    STEP 3: POWER UP PROCEDURE WITHOUT M1002A BOARDS It is extremely important that you never power up an AP3400 with the interconnecting cablesbetween the circuit boards not connected. Time and possible further damage will be reduced if you test M1011A and M1002A boards separately. To do this you must use the M1011A and M1002A test connecters.
  • Page 8 STEP 3: POWER UP PROCEDURE WITHOUT M1002 BOARDS It is extremely important that you never power up an AP-3000 or AP-3400 without following the procedure located on the M1011 schematic highlighted within the box drawn in dashed lines. Failure to do so will possibly result in damaging a good board.
  • Page 9 R117 15.6v 500mW IDLE 2N5551 ZD15 R113 R112 100K 17K8:1% AMBIENT R111 TO WC1 ON M1012 R124 M1011A.SCH_DATABASE_HISTORY R123 MODEL(S):- AP-3400 500mW ZD11 DATE VER# DESCRIPTION OF CHANGE JUN/22/94 2.30 PC#4529_BD651->BDX53C_BD652->BDX54C DEC/02/94 2.40 PC#4651_DEL_LD9->LD14_ADD_NJM431L Q20A/B_Q21A/B APR/08/97 2.50 PC#5353_R60A_1/2W_220K->2W_220K M1002A.SCH_DATABASE_HISTORY MODEL(S):-...
  • Page 10 ON THIS CIRCUIT BOARD. INTERFACE 5: LTSENSE (REQUIRED FOR OPERATION) THE MAXIMUM CURRENT AVAILABLE FROM RDRV (LDRV) IS LIMITED TO 75 mA. M1011A.SCH_DATABASE_HISTORY LEFT ACTIVITY 500mW MODEL(S):- AP-3400 DATE VER# DESCRIPTION OF CHANGE 330R JUN/22/94 2.30 PC#4529_BD651->BDX53C_BD652->BDX54C GREEN ACTGND DEC/02/94 2.40...
  • Page 11 Q12A MPSA42 Q18A Q13A MJE340 MPSA92 C26A C23A Q17A NJM431 BC550 C24A M1011A.PCB_DATABASE_HISTORY " ETCH " " MODEL(S):- GUIDE AP-3400 " DATE VER# DESCRIPTION OF CHANGE AUG/06/93 4.51 PC#4443_R17,R18_470R->270R R19_51K->43K JAN/18/94 4.52 PC#4533_R19_43K->45K3 FEB/94 4.52 PC#4545_R1/R22_6K2->5K36 JUN/22/94 4.53 PC#4529_BD651->BDX53C_BD652->BDX54C NOV/29/94 5.00...
  • Page 12 82K5 10K0 100K 100K 33078 82K5 100K 10K0 Q12A MPSA42 Q13A MPSA92 C23A Q17A BC550 C24A M1011A.PCB_DATABASE_HISTORY ETCH MODEL(S):- GUIDE AP-3400 DATE VER# AUG/06/93 4.51 PC#4443_R17,R18_470R->270R R19_51K->43K JAN/18/94 4.52 PC#4533_R19_43K->45K3 FEB/94 4.52 PC#4545_R1/R22_6K2->5K36 JUN/22/94 4.53 PC#4529_BD651->BDX53C_BD652->BDX54C NOV/29/94 5.00 PC#4651_LED’S->NJM431+2_RESISTORS FEB/15/95 5.10...
  • Page 13 FILTER 17K8:1% 470R 16v 150n 5532 82K5:1% 20KHz +2dB +4dB 55Hz FILTER 17K8:1% 470R 16v 150n 5532 82K5:1% 20KHz +2dB 18Ga BLACK WIRE TO M1011 GND AUDIO-PRO AP-3400 M1012-2.00 TITLE: INPUT_&_FILTER SIG_L REF_L SIG_R REF_R 100n 100n SCH ISSUE: 0.00...
  • Page 14 PCB MECH M1012-2.00 GREY_BUTTON 0 " GREY_BUTTON SWITCH/S ARE #3436 BUT1 BREAK BEFORE #3436 MAKE!!!! #3436 BLK 13" 16AWG 16AWG FUNCTION " " LINEWIDTH GAUGE " " " SHEAR 0 " BUT2 UNBAL_IN_B AP-3400 M1012A SHEAR B_BAL_INPUT PT#3660 PART# 33078 TJH2...

  • Page 15: Description Of Change

    500mW ZD14 500mW ZD11 470u EY13 EY14 40CFM NOTE: CAPACITOR VOLTAGE RATINGS SHOWN ARE MINIMUM REQUIRED. ACTUAL PARTS MAY HAVE HIGHER VOLTAGE RATINGS. ALL UNMARKED DIODES ARE 1N4148. AP-3400 AUG/12/97 MODELS: M1013A.SCH PCB#&VER: M1013A MPSA06 2N5551 1N4004 1N4004 ABOUT 5 WATTS...
  • Page 16 ORANGE WIRE TO EY3 FOR 240V 13A/85C GREEN WIRE TO EY3 FOR 220V WC11 EY11 GREY 240V 220V YELLOW YELLOW 220/240VAC EY10 BLUE YSL#1288E BLUE EY12 WHITE WC10 CHASSIS UNDER CAP: 220/240 VAC 50 Hz LINE GROUND STRAP TO WC1 ON M1012 MJH11018 MPSA06 2N5551...
  • Page 17 SHEAR " GUIDE " ETCH " " T-BRK M1013A 100K #6477 M1013A @C1 80V 330U AP-3400 @C1 80V 330U @C1 80V 330U LEADS UP @C1 80V 330U AP-3400 ASSEMBLY M1013-2.30 PCB MECH M1013-2.30 M1013A TJH2 R109 FUNCTION 4148 R108 R110...
  • Page 18 YS#6900 MR854 YS#6900 YS#6927 MR854 YS#6927 NOTE #6 TAB6 OUTPUT MBS4992 0.5W 0.5W M1002A 250V AP-3400 VER. 9.10 0.5W 0.5W +78V +145V TAB1 TAB2 TAB3 M1002A _WC7 YS#6900 MR854 YS#6900 YS#6927 MR854 YS#6927 R29A MTP10N15L MTP8P20 R45A 5.5"BLK 16AWG 2WATT TP10 7"YEL...
  • Page 19 Testing Repaired Circuit Board Now that you have rebuilt the M1002 or M1002A circuit board. It is just as important to properly power up the board. If the sinewave doesn’t look right check the signal at test point (1) on M1002 to ensure that the voltage amplifier on board M1011 or M1011A isn’t distorting the signal.
  • Page 20 AP3000 AND AP3400 SERVICE Quick Fix for M1002 and M1002A To speed up the servicing of the AP3000 or AP3400 on your bench, Yorkville Sound’s service department has developed a method to replace the components most likely to fail when a M1002/A amplifier board requires service.
  • Page 21 STEP 1. Locate the assembly drawing for the version number printed on the M1002 or M1002A circuit board to be serviced. Remove all of the transistors coloured RED on the assembly drawing. Measure and remove any of the diodes coloured BLUE on the assembly drawing that may be damaged.
  • Page 22 Measure the resistor coloured GREEN. The measured value should measure within + or – 5% value listed in the table below. Replace any resistor that measured beyond the + or – 5% value listed in the table below. Resistor Number Measure across the pair of test points listed in the table below.
  • Page 23 SHEAR YS#6900 CHECK MR854 YS#6900 CHECK CHECK YS#6927 MR854 CHECK YS#6927 NOTE #6 TAB6 OUTPUT MBS4992 0.5W 0.5W M1002A 250V AP-3400 VER. 9.10 0.5W 0.5W +78V +145V TAB1 TAB2 TAB3 M1002A _WC7 YS#6900 CHECK MR854 YS#6900 CHECK CHECK YS#6927 MR854...
  • Page 24 WC1 0 250V 250V 250V T JH 1 A C - W H I T E G R E Y EY11 B L U EY13 EY14 T - BR K W C 1 1 SHOWN WIRED FOR 230V 100K AP-3400CE XFMR WIRING NOV 13.
  • Page 25 WC1 0 250V 250V 250V T JH 1 A C - W H I T E G R E Y EY11 B L U EY13 EY14 T - BR K W C 1 1 SHOWN WIRED FOR 245V 100K AP-3400CE XFMR WIRING NOV 13.

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