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Pioneer SX-720 Service Manual

Pioneer SX-720
27 pages
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Pioneer SX-720 Specifications

General IconGeneral
Damping Factor30
Output150mV (line)
Speaker Load Impedance4Ω to 16Ω
TypeStereo Receiver
Input Sensitivity150mV (line)
Signal to Noise Ratio70dB (MM)
Semiconductors20 x transistors

Summary

1. SPECIFICATIONS

Amplifier Specifications

Details power output, harmonic distortion, damping factor, and input/output characteristics.

FM Tuner Specifications

Covers usable sensitivity, quieting sensitivity, separation, selectivity, and response.

AM Tuner Specifications

Lists sensitivity, selectivity, image response, IF response, and AM suppression.

Miscellaneous Specifications

Includes power requirements, consumption, dimensions, and weight.

2. FRONT PANEL FACILITIES

Front Panel Controls - Indicators and Tuning

Details power, tuning meters, indicators, and tuning controls on the front panel.

Front Panel Controls - Audio and Source Selection

Describes audio adjustment, tape monitoring, function selection, and volume controls.

3. BLOCK DIAGRAM

System Block Diagram

Illustrates the overall signal flow and major component blocks of the receiver.

4. CIRCUIT DESCRIPTIONS

AM, FM, Equalizer, and Power Amplifier Circuits

Detailed descriptions of the AM/FM tuners, equalizer, and power amplifier sections.

Indicator Circuit Description

Explanation of the fluorescent indicator tube drive circuit and power indicator operation.

5. DISASSEMBLY

Disassembly Procedures

Step-by-step instructions for disassembling the receiver, including side boards, top, bottom, and front panels.

6. DIAL CORD STRINGING

Dial Cord Stringing Procedure

Detailed steps for correctly stringing the dial cord for the tuning mechanism.

7. PARTS LOCATION

Front Panel Parts Identification

Diagrams and labels identifying components on the front panel and after panel removal.

Rear Panel and Top View Parts Identification

Diagrams identifying components on the rear panel and top view of the unit.

8. ADJUSTMENTS

FM Tuner Adjustments

Procedure for adjusting tuning capacitors and coils for optimal FM reception.

Multiplex Decoder Adjustments

Steps to adjust VR5 and T1 core for proper FM stereo demodulation.

AM Tuner Adjustments

Procedure for adjusting T4, T5, TC4, and TC5 for optimal AM sensitivity.

Power Amplifier Adjustments

Includes idle current and output indicator adjustment procedures.

9. EXPLODED VIEW

Exterior Components Exploded View

Diagram showing the breakdown of exterior components with a parts list.

Interior Components Exploded View

Diagram showing the breakdown of interior components.

Interior Components Parts List

Detailed list of internal parts with part numbers and descriptions.

10. PACKING

Packing Procedure and Materials

Details the packing materials and method for safely shipping the receiver.

11. SCHEMATIC DIAGRAM, P.C. BOARDS CONNECTION DIAGRAM AND PARTS LIST

Transistor and IC Appearance

Illustrations of the external appearance of various transistors and ICs used in the unit.

P.C. Boards Connection Diagram

Diagram showing how the main circuit boards are interconnected within the receiver.

Parts List - Semiconductors, Fuses, Lamps

Lists semiconductors, fuses, and lamps with their part numbers and descriptions.

Parts List - Capacitors and Resistors

Detailed list of capacitors and resistors with part numbers and specifications.

Parts List - Diodes, Terminals, and Other Components

Lists diodes, terminals, LEDs, and other miscellaneous parts for the receiver.

1. CONTRAST OF MISCELLANEOUS PARTS

Part Differences SX-3600 vs SX-720

Compares miscellaneous parts, assembly, packing, and furnished parts between SX-3600 and SX-720 models.

2. SCHEMATIC DIAGRAM,P.C.BOARD PATTERN

FL Assembly Schematic and PCB Pattern

Schematic diagram and PCB layout for the FL Assembly (AWV-014) of the SX-720.

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