Pioneer PL-420 User Manual

Service
AL ETAIEY|
REPAIR
&
ADJUSTMENTS
ORDER
NO.
ART-705-0
STEREO TURNTABLE
L=-5
PL-420
MODEL PL-5 COMES IN FOUR VERSIONS DISTINGUISHED AS FOLLOWS:
Voltage Remarks
120V only U.S.A. model (Without cartridge)
120V only Canada model (Without cartridge)
110V—120V/220V—240V (Switchable) | General export model
110V—120V/220V —240V (Switchable) U.S. military model
MODEL PL-420(which is minor change in design from PL-5) COMES IN THREE VERSIONS
DISTINGUISHED AS FOLLOWS:
Voltage Remarks
120V only U.S.A. model
110V—120V/220V—240V (Switchable) General export model (Without dust cover)
110V—120V/220V—240V (Switchable) U.S. military model (Without dust cover)
= This is the service manual for model PL-5/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 francais.
= Este manual de servicio trata del método de ajuste escrito en espanol.
e For the circuit and mechanism descriptions, please refer to the supplement of model
PL-7 service manual (ART-768).
Ne ne at ees
PIONEER ELECTRONIC CORPORATION 4-1. Meguro 1-Chome, Meguro-ku, Tokyo 153, Japan
U.S. PIONEER ELECTRONICS CORPORATION 8&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. 178-164 Boundary Road, Braeside, Victoria 3195, Australia
FU©®MAY 1981 Printicd in Japan
ag era

Pioneer PL-420 Specifications

General

Overhang	15 mm
Speeds	33 and 45rpm
Platter	Aluminum
Tonearm Type	Static Balance
Cartridge	Moving Magnet
Dimensions	420 x 350 x 120 mm
Type	Belt Drive

Summary

REPAIR & ADJUSTMENTS

SPECIFICATIONS

DISASSEMBLY

TROUBLESHOOTING

Tonearm Does Not Lead In

Troubleshooting steps for when the tonearm does not lead in.

Repeat Function Failure

Troubleshooting steps for when the repeat function does not work.

Repeat Function Issues

Troubleshooting for faulty or incorrect repeat function operation.

Auto-Return Not Working

Troubleshooting steps for when the auto-return function fails.

Fast Return Function

Troubleshooting steps for when the return function operates too fast.

Tonearm Lowering Position Error

Troubleshooting steps for incorrect tonearm lowering position.

Record Size Selector Malfunction

Troubleshooting steps for when the record size selector malfunctions.

Motor Not Rotating

Troubleshooting steps for when the motor fails to rotate.

Tonearm Returns to Rest at 17cm Setting

Troubleshooting for tonearm returning to rest when size is set to 17cm.

Auto Operation Repeating

Troubleshooting for automatic operation repeating unexpectedly.

Motor Does Not Stop

Troubleshooting steps for when the motor does not stop.

MOTOR ASSEMBLY TROUBLESHOOTING

Motor Does Not Turn

Motor Runs Away

Motor Dead Spot Issues

PRECAUTIONS FOR REASSEMBLY

P.C. BOARDS CONNECTION DIAGRAM

BLOCK DIAGRAM

ADJUSTMENTS

Auto-Return Adjustment Procedure

Arm Elevation Adjustment

Stylus Landing Position Adjustment

Motor Operating Point Adjustment

SPECIFICATIONS

SCHEMATIC DIAGRAM