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Instruction Manual
760A/760D/760N
Stereo Audio Monitors
(760A S/N B050000 & Above)
(760D/760N S/N B030000 & Above)
070-5992-05
Warning
The servicing instructions are for use by qualified
personnel only. To avoid personal injury, do not
perform any servicing unless you are qualified to
do so. Refer to all safety summaries prior to
performing service.
Please check for change information
at the rear of this manual.
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Copyright Tektronix, Inc. All rights reserved. Tektronix products are covered by U.S. and foreign patents, issued and pending. Information in this publication supercedes that in all previously published material. Specifications and price change privileges reserved. Printed in the U.S.A. Tektronix, Inc., P.O. Box 1000, Wilsonville, OR 97070–1000 TEKTRONIX and TEK are registered trademarks of Tektronix, Inc.
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WARRANTY Tektronix warrants that this product will be free from defects in materials and workmanship for a period of one (1) year from the date of shipment. If any such product proves defective during this warranty period, Tektronix, at its option, either will repair the defective product without charge for parts and labor, or will provide a replacement in exchange for the defective product. In order to obtain service under this warranty, Customer must notify Tektronix of the defect before the e
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Table of Contents List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v General Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii Service Safety Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix Preface . . . . . . . . . . . . . . . . . . . . . . . .
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Contents Maintenance Section 4 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1 Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4–1 Visual Inspection . . . .
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Contents DAC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–6 LOW VOLTAGE POWER SUPPLY <6> . . . . . . . . . . . . . . . . . . . . . . . . . . 6–6 Line Rectifier and Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–7 Pulse Width Modulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6–7 Output Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Contents List of Figures Figure 1–1: LED Bar Graph scales for the 760A, 760D, and 760N . . . . . 1–1 Figure 2–1: 760A Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–2 Figure 2–2: 760A Rear Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–3 Figure 2–3: 760A Sound Stage Graticule . . . . . . . . . . . . . . . . . . . . . . . . . 2–4 Figure 2–4: 760A X–Y Graticule . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2–4 Figure 2
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Contents List of Tables Table 1–1: Response Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3 Table 1–2: Return Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–3 Table 1–3: Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–4 Table 1–4: Environmental Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1–6 Table 1–5: Physical Characteristics . . . . . . . . . . . . . . . . . . . .
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Contents vi 760A / 760D / 760N
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General Safety Summary Review the following safety precautions to avoid injury and prevent damage to this product or any products connected to it. To avoid potential hazards, use this product only as specified. Only qualified personnel should perform service procedures. To Avoid Fire or Use Proper Power Cord. Use only the power cord specified for this product and certified for the country of use. Personal Injury Ground the Product. This product is grounded through the grounding conductor of the
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General Safety Summary DANGER indicates an injury hazard immediately accessible as you read the marking. WARNING indicates an injury hazard not immediately accessible as you read the marking. CAUTION indicates a hazard to property including the product. Symbols on the Product. The following symbols may appear on the product: CAUTION WARNING Double Protective Ground Refer to Manual High Voltage Insulated (Earth) Terminal viii 760A / 760D / 760N
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Service Safety Summary Only qualified personnel should perform service procedures. Read this Service Safety Summary and the General Safety Summary before performing any service procedures. Do Not Service Alone. Do not perform internal service or adjustments of this product unless another person capable of rendering first aid and resuscitation is present. Disconnect Power. To avoid electric shock, disconnect the mains power by means of the power cord or, if provided, the power switch. Use Caution
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Service Safety Summary x 760A / 760D / 760N
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Preface This manual documents the TEKTRONIX 760A/760D/760N Stereo Audio Monitor and is intended for instrument operators and service technicians. Operatorsare assumed to be familiar with basic television terms and measure- ments. Qualified service technicians are also assumed to be familiar with television terms and measurements, and have moderate experience with analog and logic circuits. The manual is divided into two parts: Operator’s Information and Service Information. The Operators info
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Preface Section 6, Theory of Operation, provides an overall block diagram and detailed circuit descriptions. The detailed circuit descriptions should be used with the block diagram and schematic diagrams in the foldout pages for specific information about the individual circuits. Section 7, Options, documents available instrument options. Section 8, Replaceable Electrical Parts List, includes order information and part numbers for all rep,aceable electrical parts. Section 9, Diagrams, contains
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Introduction and Specifications
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Section 1 Introduction and Specifications Introduction The 760A Stereo Audio Monitor is a simple yet accurate tool that the audio engineer can use to perform setup, monitoring, measuring, and troubleshooting tasks in the studio. There are two special versions of the 760A Stereo Audio Monitor: the 760D and the 760N. All three operate in exactly the same manner, but are set to use different scales for the Bar Graph displays. The three different scales are shown in Figure 1–1. Features CRT Displ
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Introduction and Specifications The display is set for a “Sound Stage” orientation when the 760A is shipped from the factory. This provides a display where monaural amplitudes are oriented on the vertical axis of the CRT. An alternate XY graticule is shipped as a standard accessory with the 760A. This graticule can be installed if you are familiar with or desire the display orientation provided by an XY monitor. Instructions for installing the XY graticule are found in SECTION 3 INSTALLATION.
