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YORKVILLE AudioPro AP3000 User Manual

YORKVILLE AudioPro AP3000
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SERVICE MANUAL
3
000
HIGH EFFICIENCY STEREO POWER AMPLIFIER
U.S.A.
Yorkville Sound Inc.
4625 Witmer Industrial Estate
Niagara Falls, New York
14305 USA
Voice: (716) 297-2920
Fax: (716) 297-3689
WORLD HEADQUARTERS
CANADA
Yorkville Sound
550 Granite Court
Pickering, Ontario
L1W-3Y8 CANADA
Voice: (905) 837-8481
Fax: (905) 837-8746
Quality and Innovation Since 1963
Printed in Canada
VERSION 1.50 October 1998
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YORKVILLE AudioPro AP3000 Specifications

General IconGeneral
Slew Rate>20V/µs
CoolingVariable Speed Fan
Signal to Noise Ratio>100dB
Frequency Response20Hz-20kHz (+/-0.5dB)
Input Impedance20k Ohms balanced
Input Impedance Unbalanced10k Ohms
Input Sensitivity1.4V
Crosstalk>70dB
ProtectionThermal, short circuit, DC, overload
Connectors (Input)XLR, 1/4" TRS
Connectors (Output)Speakon
Power Consumption (Typical)1200W
THD<0.05%

Summary

IMPORTANT SAFETY INSTRUCTIONS

General Safety Precautions

Essential safety warnings for product operation and servicing.

Fire and Electric Shock Warnings

Critical instructions to prevent fire, electric shock, or injury.

M1012 "The Input Board"

Input Board Circuit Description

Processes audio signal, gain stages, filters, and interference elimination.

M1011 "Voltage Amplifiers and System Control"

Board Contents and Circuit Explanation

Details voltage amplifiers, control circuitry, and signal path explanation.

Shutdown Circuit Operation

Manages amplifier shutdown via relay for protection or turn-off.

M1002 "Current Amplifier Board"

Function and Biasing

Receives audio, drives speakers, explains biasing and equilibrium.

M1002 Second Tier Voltage Control

Second Tier Operation Details

Describes varying power supply voltage for efficiency and signal compensation.

M1002 Protection Circuits

DC Protection Circuit

Triac circuit to hold output at ground if DC voltage exceeds limits.

Current Limit Protection Circuitry

Simulates SOAR curve to protect output transistors from excessive current.

EMS, Fan, and Thermal Circuits

EMS Circuit Operation

Manages AC line current draw for North American products.

Fan Circuit Operation

Controls fan speed based on thermistor temperature on M1002 boards.

Thermal Shutdown Circuit

Shuts down amplifier if heatsink temperature exceeds safe limits.

Identifying Defective Boards

Visual Inspection Steps

Steps for inspecting front panel, fan, and internal chassis for issues.

Power Up Procedure

Power Up Without M1002 Boards

Steps for powering up the unit without M1002 boards connected.

Dismantling and Reassembly Precautions

Precautions for Board Handling

Guidelines for safely removing and reinstalling circuit boards.

Specifications

Power and Performance Metrics

Details power output, THD, crosstalk, input impedance, and sensitivity.

Performance and Physical Details

Covers frequency response, hum/noise, slew rate, damping factor, and dimensions.

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