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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
VERSION 1.50 October 1998
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Table of Contents
Related Manuals for YORKVILLE Audiopro 3400
Summary of Contents for YORKVILLE Audiopro 3400
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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
IMPORTANT SAFETY INSTRUCTIONS 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). Each channel consists of a balanced gain stage, defeatable bass boost filter, and a preemphasis filter network. INSTRUCTIONS PERTAINING TO A INSTRUCTIONS RELATIVES AU The balanced input, (XLR Jack) and unbalanced input (phone jack) are wired in parallel to the input of a balanced... -
Page 3: Circuit Description
VOLTAGE AMPLIFIER: SHUTDOWN CIRCUIT: The voltage amplifier amplifies the audio signal?s voltage from 4.8 volts peak (at the output of U2) to approximently The last circuit on board M1011A is the shutdown relay and its associated drive circuitry. The relay circuit has two 97v peak which is required to drive the current amplifier board M1002A. - 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 EMS Circuit Identifying Defective Boards in the AP-3400 The Energy Management System circuit only applies to North American line voltage products. A North American AC receptacle can provide 1850 watts before the wall breaker would trip, but how can a amplifier provide 2 x 1200 watts STEP 1: VISUAL INSPECTION OF FRONT PANEL AND FAN out when only 1850 watts is avaliable out of the AC receptacle? A sinewave source connected to the amplifier driving A.
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Page 7: Specifications
M1011A and M1002A test connecters. These are shown in figures #5 and #6. These can be made if the BURST AVERAGE Molex connector parts are available or order them from the Yorkville Service Parts Dept. With the test connectors Measured as a 2 cycle burst at 1KHz, 8:1 duty. (Continuous measurements may require line currents >15 Amps). - Page 8 AP3400 Parts List 10/28/98 YS # Description Qty. YS # Description Qty. YS # Description Qty. 6410 GREEN 3MM LED 1V7 5MA BULK BRT CLR 5621 470U 63V 20%CAP RADIAL ELECT BULK 4854 1/4W 1K2 5% T&R RES Identifying Defective Boards in the AP-3000 & AP-3400 6411 RED 3MM LED 1V9 5MA BULK BRIGHT 5892...
- Page 9 MODELS: SCH ISSUE: 1.00 WC10 ZD10 0R15 POWER_AMP THERMALLY COUPLED BC550 ACTUAL VOLTAGE RATINGS MAY BE HIGHER. 330u BAV21 R35A TO Q14 AND Q22 YORKVILLE NAME: AP3400 PCB#&VER: M1002A/M1011A/M1012A/M1013A TITLE: AP3400 500mW FOR PROPER THERMAL 150v 249R:1% TRACKING! 150v BC560...
- Page 10 2.10 PC#5551_ADD_R79,ZD10_ACROSS_R11 ACTUAL VOLTAGE RATINGS MAY BE HIGHER. ADD_R79,R80 AP-3400 DATE: MAR/12/98 MODELS: SCH ISSUE: 2.20 MAR/12/98 2.20 PC#5656_R49,R79->0R47/1W_ZD7->18V YORKVILLE NAME: M1002A.SCH PCB#&VER: M1002A TITLE: PWR_AMP -1dB 30Hz +4dB 55Hz FILTER MUST BE BREAK BEFORE MAKE, #3436 10K:1% 100p 16v 470n...
- Page 11 " GUIDE B L A N K S I Z E = 1 6 . 0 0 0 " X 1 1 . 0 5 0 " " ETCH M1011A " S O L D E R S I D E M 1 0 1 1 - 5 . 1 0 "...
- Page 12 NOTE: ALL UNMARKED DIODES ARE 1N4148 CAPACITOR VOLTAGES SHOWN ARE MINIMUM REQUIRED. 0.5W (REQUIRED FOR OPERATION) BDX54C AP-3400 THE MAXIMUM CURRENT AVAILABLE FROM DATE: APR/10/97 MODELS: SCH ISSUE: 2.50 RDRV (LDRV) IS LIMITED TO 75 mA. FP=FLAMEPROOF YORKVILLE NAME: M1011A25 PCB#: M1011A TITLE: SCH_NAME...
- Page 13 ASSEMBLY M1012-2.10 BLANK SIZE=15.700"X10.000" PCB MECH M1012-2.00 GREY_BUTTON 0 " 0 " GREY_BUTTON A_BAL_INPUT B_BAL_INPUT BUT2 PT#3660 PT#3660 SWITCH/S PART# UNBAL_IN_A UNBAL_IN_B ARE #3436 BUT1 BREAK TJH1 BEFORE #3436 MAKE!!!! #3436 33078 33078 BLK 13" 16AWG 16AWG FUNCTION TJH2 AP-3400 LINEWIDTH GAUGE M1012A...
- Page 14 PC#5444_R120->122_1/4W->1/2W KILL NOTE: CAPACITOR VOLTAGE RATINGS SHOWN ARE MINIMUM REQUIRED. ACTUAL PARTS MAY HAVE HIGHER VOLTAGE RATINGS. ALL UNMARKED DIODES ARE 1N4148. AP-3400 DATE: AUG/12/97 MODELS: SCH ISSUE: 1.40 YORKVILLE NAME: M1013A.SCH PCB#&VER: M1013A TITLE: SUPPLY/FAN_PCB M1013A " GUIDE "...