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Pioneer SX-3700 Service Manual

Pioneer SX-3700
40 pages
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Pioneer SX-3700 Specifications

General IconGeneral
Power Output45 watts per channel into 8Ω (stereo)
Total Harmonic Distortion0.05%
Tuning RangeFM, MW
Damping Factor30
Input Sensitivity2.5mV (MM), 150mV (line)
Output150mV (line)
Speaker Load Impedance4Ω to 16Ω
Semiconductors4 x IC

Summary

1. SPECIFICATIONS

Amplifier Section

Details power output, distortion, and frequency response for the amplifier.

AM Tuner Section

Covers sensitivity, selectivity, and signal-to-noise ratio for the AM tuner.

FM Tuner Section

Specifies sensitivity, quieting, and signal-to-noise ratio for the FM tuner.

Miscellaneous Specifications

Lists power requirements, consumption, dimensions, and weight.

Furnished Parts

Lists items included with the unit, like operating instructions and antenna.

2. FRONT PANEL FACILITIES

Front Panel Controls Overview

Describes key controls and indicators on the front panel.

Bass, Treble, and Filter Controls

Details bass, treble, low filter, tape monitor, function, balance, mode, loudness, and volume controls.

3. BLOCK DIAGRAM

RF Block Diagram

Illustrates the signal path of the RF receiver section.

AF Block Diagram

Shows the signal flow of the audio frequency processing section.

4. CIRCUIT DESCRIPTIONS

FM Tuner Circuit

Explains the FM front end, IF amplifier, detector, and multiplex decoder.

Quartz-Lock System

Describes the frequency servocontrol system for stable tuning.

AM Tuner Circuit

Details the components and operation of the AM tuner stage.

Display Circuit

Explains the frequency display and its components like FL tubes.

Tuning Indicator Circuit

Explains the function and operation of the tuning indicators.

Signal Indicator Circuit

Describes the 5-point signal indicator display and its driver.

Tuning Indicator Driver Circuit

Details the electronic circuit that drives the tuning indicators.

Signal Indicator Driver Circuit

Explains the circuit for the signal strength indicator.

Equalizer Amplifier Circuit

Describes the equalizer amplifier IC and its specifications.

Tone Control Amplifier Circuit

Explains the tone control amplifier circuit.

Power Amplifier Circuit

Details the power amplifier stages and output specifications.

Power Indicator Circuit

Explains the circuit responsible for the output power indicators.

Protection Circuit

Describes the circuit protecting the amplifier and speakers.

Overload Detector Circuit

Explains the circuit for detecting overload conditions.

DC Voltage Detector Circuit

Describes the circuit for detecting DC voltage at the output.

5. DISASSEMBLY

Bonnet Case Removal

Provides instructions for removing the top cover of the unit.

Bottom Plate Removal

Provides instructions for removing the bottom panel.

Front Panel Removal

Provides instructions for removing the front panel assembly.

6. PARTS LOCATIONS

Front Panel Parts Identification

Identifies components and controls on the front panel.

Interior Parts Identification (Front View)

Identifies internal components visible from the front.

Rear Panel Parts Identification

Identifies components and connectors on the rear panel.

Top View of Interior Components

Shows the location of major internal assemblies.

7. DIAL CORD STRINGING

Dial Cord Stringing Procedure

Step-by-step instructions for threading the tuning dial cord.

8. ADJUSTMENTS

FM Tuner Adjustments

Details FM tuner alignment procedures for optimal performance.

Multiplex Decoder Adjustments

Explains adjustments for the multiplex decoder circuit.

AM Tuner Adjustments

Details AM tuner alignment procedures for optimal performance.

Idle Current Adjustment

Describes how to set the amplifier's idle current.

FL Indicator Circuit Calibration

Explains calibration for the frequency display circuit.

Output Power Indicator Calibration

Details calibrating the output power indicators.

9. SCHEMATIC DIAGRAMS, P.C. BOARD CONNECTION DIAGRAM AND PARTS LIST

External Appearance of Transistors and ICs

Shows the physical appearance of common semiconductor components.

Schematic Diagram

Provides the main circuit schematic for the receiver.

P.C. Board Connection Diagram

Shows component placement and connections on PCBs.

Parts List - Miscellaneous

Lists miscellaneous parts like assemblies and switches.

Parts List - Electro-parts

Lists transformers, antennas, and lamps.

Parts List - Capacitors

Lists capacitor part numbers and symbols.

Parts List - Capacitors (Continued)

Lists additional capacitor part numbers and symbols.

Parts List - Resistors

Lists resistor part numbers and symbols.

Parts List - Semiconductors

Lists semiconductor part numbers and symbols.

Parts List - Others

Lists terminals, screws, and resonators.

Parts List - Transformer

Lists transformer part numbers and symbols.

Parts List - Semiconductors (Continued)

Lists more semiconductor part numbers.

Parts List - Coils

Lists coil part numbers.

Parts List - Capacitors (Continued)

Lists more capacitor part numbers.

Parts List - Resistors (Continued)

Lists more resistor part numbers.

Parts List - Semiconductors (Continued)

Lists more semiconductor part numbers.

Parts List - FL Assembly

Lists parts for the FL assembly.

Parts List - Semiconductors (Continued)

Lists more semiconductor part numbers.

Parts List - Resistors (Continued)

Lists more resistor part numbers.

Parts List - Semiconductors (Continued)

Lists more semiconductor part numbers.

10. PACKING

Packing Contents and Instructions

Lists items included in the package and general packing advice.

11. EXPLODED VIEW

Exterior Components Exploded View

Shows an exploded view of external parts.

Exterior Parts List

Lists part numbers for external components.

Interior Components Parts List

Lists part numbers for internal components.

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