Pioneer SX-727 Service Manual

<R42-239-0>
AM/FM STEREO RECEIVER
SX-727/ KUW,FVZW,FW
NOTE
MODEL SX-727 COMES IN THREE VERSIONS DISTINGUISHED AS FOLLOWS:
Round label on
rear panel
Voltage
Type
KUW
FVZW
FW
120V only
5-position selector
5-position selector
UL approved(U.S.A-)
FTZ approved(West Germany)
General export model
PIONEER
<7!L03Y6iF>
I

Pioneer SX-727 Specifications

General

Total Harmonic Distortion	0.5%
Input Sensitivity	2.5 mV (MM), 200 mV (line)
Tuning Range	FM, MW
Signal to Noise Ratio	75 dB (MM), 85 dB (line)
Speaker Load Impedance	4 to 16 ohms
Semiconductors	4 x IC
Damping Factor	40 (8 ohms, 1kHz)

Summary

Specifications

Front Panel Facilities

Front Panel Controls

Main operational controls for adjusting sound and selecting sources.

Front Panel Switches & Indicators

Switches for system operation and indicators for tuning and reception status.

Input & Output Jacks

Ports for connecting external devices like headphones, microphones, and tape decks.

Connection Diagram

Block Diagram

Disassembly Procedures

Wooden Case Removal

Instructions for removing the wooden case.

Bottom Plate Removal

Procedure for removing the bottom plate.

Front Panel Removal

Steps to remove the front panel assembly.

Parts and PCB Location

Dial Cord Stringing

Alignment Procedure

Required Instruments

List of test equipment needed for alignment procedures.

FM 10.7 MHz Alignment

Steps for aligning the FM intermediate frequency circuit.

FM Front End Alignment

Procedure for aligning the FM receiver front end stages.

FM MPX Decoder Alignment

Steps for aligning the FM stereo multiplex decoder circuit.

Muting Threshold Level Alignment

Procedure to set the FM muting threshold.

AM 455kHz Alignment

Steps for aligning the AM intermediate frequency circuit.

AM Tracking Alignment

Procedure for aligning the AM receiver tracking.

Packing Method and Part Numbers

Schematic Diagrams, PCB Patterns and Parts List

Unit Connection Diagram and Miscellaneous Parts

Shows overall unit connections and lists miscellaneous components.

FM Front End Schematic

Detailed schematic diagram for the FM Front End circuit.

FM/AM Unit Schematic

Schematic diagram for the FM/AM Tuner unit.

CR Unit Schematic

Schematics for the CR Unit (AWX-014 and AWX-017).

Head Amp Unit Schematic

Schematic diagram for the Head Amplifier Unit.

AF Unit Schematic

Schematic diagram for the Audio Frequency Amplifier Unit.

Power Amp Unit Schematic

Schematic diagram for the Power Amplifier Unit.

Power Supply Unit Schematic

Schematic diagram for the Power Supply Unit.

Protector Unit Schematic

Schematic diagram for the Protection Unit.

Additional Information

Protector Unit Revision (AWM-027)

Information on Protector Unit AWM-027 replacing AWM-011 for specific serial numbers.

Semiconductor Design Changes

Notes on changes in transistors and diodes used in SX-727 design.