Pioneer PL-4 Service Manual

Service
PAL ETUIET
REPAIR
&
ADJUSTMENTS
ORDER
NO.
ART-709-0
STEREO TURNTABLE
L.—<}
PL-320
MODEL PL-4 COMES IN SEVEN VERSIONS DISTINGUISHED AS FOLLOWS:
Remarks
120V only U.S.A. model (Without cartridge)
120V only Canada model (Without cartridge)
220V — 240V Europe model
220V — 240V United kingdom model
220V — 240V Oceania model
110V—1 20V/220V—240V (Switchable) General export model
110V—120V/220V—240V (Switchable) U.S. military model
MODEL PL-320 COMES IN FIVE VERSIONS DISTINGUISHED AS FOLLOWS:
Voltage Remarks
220V — 240V Europe model
220V — 240V United kingdom mode!
220V — 240V Oceania model
110V—120V/220V—240V (Switchable) Generali export mode!
110V—1 20V/220V—240V (Switchable) U.S. military model (Without dust cover)
= This is the service manual for model PL-4/KUT. For servicing of the other types,
please refer to the additional service manual.
®= Ce manuel d’instruction se refére au mode de réglage, en frangais.
= Este manual de servicio trata del método de ajuste escrito en espajiol.
PIONEER ELECTRONIC CORPORATION 4-1. Meguro 1-Chome, Meguro-ku, Tokyo 153, Japan
U.S. PIONEER ELECTRONICS CORPORATION &5 Oxford Drive, Moonachie, New Jersey 07074, U.S.A.
PIONEER ELECTRONIC (EUROPE) N.V. Luithagen-Haven 9, 2030 Antwerp, Belgium
PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178-184 Boundary Road, Braeside, Victoria 3195, Australia
FU © APR. 1981 Printed in Japan

Pioneer PL-4 Specifications

General

Brand	Pioneer
Model	PL-4
Category	Turntable
Language	English

Summary

1. Specifications

Motor and Turntable Specifications

Details about drive system, motor, platter, speeds, wow/flutter, and S/N ratio.

Tonearm Specifications

Details about tonearm type, length, overhang, and usable cartridge weight.

Subfunctions and Miscellaneous Specs

Lists operational features like auto-return and anti-skating, plus power, dimensions, and weight.

Accessories and Notes

Lists EP adapter, operating instructions, and includes a modification disclaimer.

2. Front Panel Facilities

Control Layout and Operation Guide

Describes all front panel controls including switches, adjustments, tonearm operations, and indicators.

3. Disassembly Procedures

Panel and Base Removal Steps

Step-by-step guide for removing the main panel and base assembly.

3. Disassembly Procedures (Continued)

Key Component Assembly Removal

Procedures for removing the motor, tonearm, and control mechanism assemblies.

4. Troubleshooting Guide

Auto-Return Mechanism Faults

Diagnosing and resolving issues with the auto-return function.

4. Troubleshooting Guide (Continued)

Motor Operation and Return Speed Issues

Troubleshooting for motor not rotating, not stopping, or fast return speed.

4. Troubleshooting Guide (Continued)

Motor Assembly Notes and Turning Problems

Guidance on motor assembly grounding and diagnosing why the motor does not turn.

4. Troubleshooting Guide (Continued)

Motor Speed and Stopping Faults

Diagnosing motor overspeeding (runaway) and failure to stop.

5. Reassembly Precautions

Lubrication Points and Procedures

Details on required lubricants and specific areas for application during reassembly.

5. Reassembly Precautions (Continued)

Component Attachment and Wiring Guidance

Precautions for attaching motor, PU plate, AS knob, arm base, and wiring connectors.

7. PC Boards Connection Diagram

Wiring Diagram for Assemblies

Diagram illustrating connections between PC boards and assemblies.

8. Schematic Diagram

Circuit Component Identification and Notes

Details on resistors, capacitors, semiconductors, switches, and general circuit notes.

9. Exploded Views

Exterior Parts Identification

Exploded view illustration of external parts for component identification.

General Parts List

9.2 Mechanism Assembly

Mechanism Parts List

9.3 Motor Assembly

10. Electrical Parts List

Power Supply and Control Assembly Parts

List of components for power supply and control assemblies.

Motor Control Assembly Components

List of components for the motor control assembly.

Switches, Capacitors, Resistors, Semiconductors

List of electronic components for various sections.

11. Adjustments

Auto-Return Adjustment Procedure

Step-by-step guide to adjust the auto-return function.

Arm Elevation Adjustment Procedure

Procedure for setting the correct tonearm elevation height.

Motor Speed Adjustment

Guide to adjusting motor operating points for correct speed.

12. Packing Procedures

1. Specifications (Additional)

Miscellaneous and Cartridge Specs

Details on power requirements, cartridge specs, and dust cover for specific models.

4. Schematic Diagrams (Additional)

PL-4/KCT Type Schematic

Circuit diagram for the PL-4/KCT model.

PL-4/R, R/G, PL-320/R, RF/G Schematics

Circuit diagrams for R, R/G, and PL-320/R, RF/G models.

2. Contrast of Miscellaneous Parts

Miscellaneous Parts Comparison Across Models

Table comparing miscellaneous parts used in different PL-4/PL-320 models.

Packing and Furnished Parts List

List of items included in the packaging and furnished with the unit.

3. Electrical Parts List (Additional)

Packing and Furnished Parts

3. Electrical Parts List (Additional)