Pioneer PL-L800 Service Manual

Service
c/Manual
CIRCUIT DESCRIPTIONS
REPAIR & ADJUSTMENTS @ —_ ORDER NO.
ART-692-0
STEREO TURNTABLE
L-LSOO
MODEL PL-L800 COMES IN SIX VERSIONS DISTINGUISHED AS FOLLOWS:
Voltage Remarks
120V only U.S.A. model
120V only Canada model
220V and 240V (Switchable) Europe model
220V and 240V (Switchable) U.K. model
110V, 120V, 220V, 240V (Switchable) General export model
110V, 120V, 220V, 240V (Switchable) U.S. military model
« This service manual is applicable to the KU type. When repairing 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 espanol.
CONTENTS
1...
“SPECIFICATIONS
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PIONEER ELECTRONIC CORPORATION 4-1. Meguro 1-Chome, Meguro-ku, Tokyo 153, Japan
U.S. PIONEER ELECTRONICS CORPORATION &5 Oxford Drive, Moanachie, New Jersey 07074, U.S.A.
PIONEER ELECTRONIC (EUROPE) N.V. Lulthagen-Haven 3. 2030 Antwerp. Belgium
PIONEER ELECTRONICS AUSTRALIA PTY. LTD. 178-184 Boundary Road, Braeside, Victoria 3195, Australia

Pioneer PL-L800 Specifications

General

Speeds	33 1/3 and 45 rpm
Platter	Aluminum die-cast
Wow and Flutter	0.025% WRMS
Type	Direct Drive Turntable
Motor	Quartz PLL DC Servo Motor
Tonearm	Linear tracking
Cartridge	Moving Magnet (MM)
Tracking Force	1.25 g
Signal to Noise Ratio	78dB (DIN-B)

Summary

1. SPECIFICATIONS

Motor and Turntable

Details of motor and turntable specifications.

Miscellaneous

Other general specifications like power requirements and dimensions.

Rotational Characteristics

Specifies build-up time, speed deviation, and speed drift.

Tonearm

Details regarding tonearm type, length, and cartridge weight.

Subfunctions

Lists automatic functions like auto lead-in and auto-return.

PC-4MC Specifications

Technical specifications for the PC-4MC cartridge.

2. FRONT PANEL FACILITIES

3. DISASSEMBLY

3.1 REMOVAL OF PANEL

Step-by-step instructions for removing the top panel.

3.2 REMOVAL OF TONEARM

Procedure for disassembling and removing the tonearm assembly.

3.3 PRECAUTIONS IN REMOUNTING THE TONEARM

Important precautions for reassembling the tonearm.

4. CIRCUIT DESCRIPTIONS

4.1 BLOCK DIAGRAM

A high-level overview of the PL-L800's electronic circuits.

Arm Elevation Operation

Detailed explanation of the tonearm’s up/down movement control.

Auto Lead-in Operation

Step-by-step description of how the tonearm automatically starts playback.

Locate Operations

Explains locate-in and locate-out modes for tonearm positioning.

Automatic Operations

Covers auto-return, auto-stop, and auto-repeat functions.

4.3 MOTOR ASSEMBLY

Block Diagram

Schematic overview of the motor control system.

Basic Differences

Highlights key improvements in the motor assembly design.

Simple Signal Path

Traces the signal flow within the motor drive circuit.

Speed Sensor Section

Describes the components and function of the speed sensor.

FG AMP

Explains the function of the FG amplifier.

F/V Converter

Details how frequency is converted to voltage for speed control.

Phase-lock Discriminator Circuit

Describes the circuit responsible for phase control.

Absolute Value Amp and Rotation Direction Indicator Circuit

Stop Discriminator Circuit

Timing Chart 1

Drive Circuit

Reverse Rotation Sensing Circuit

Explains how reverse rotation is detected and managed.

5. TROUBLESHOOTING

5.1 MECHANICAL CHECKS

Troubleshooting steps for mechanical issues.

Timing Chart 2

Generation of Howling

Irregular Carrier Base Movement

Automatic Operations

Auto-Return Failure

Steps to diagnose and fix auto-return problems.

5.2 ELECTRICAL CHECKS

Operational Mode Checks

Verifies if various operational modes function correctly.

Carrier Fails to Move

Tonearm Movement

Phono Motor Fails to Rotate, Fails to Stop

Selector Switch Failure

Locate Operation Failure

Diagnosing issues with the locate-in/out functions.

Elevation Operation Failure

Auto-Cut Failure

6. EXPLODED VIEWS

6.1 EXTERIOR 1

Illustrated breakdown of the turntable's external components.

6.3 TONEARM

6.4 MOTOR ASSEMBLY

7. PACKING

9. P.C.BOARDS CONNECTION DIAGRAM

10. SCHEMATIC DIAGRAM

11. ADJUSTMENTS

11.1 TRACKING SENSOR ZERO ADJUSTMENT

Procedure for setting the tracking sensor to zero.

11.2 LOCATE SPEED ADJUSTMENT

How to adjust the tonearm's locate speed.

11.3 TONEARM LOWERING POSITION ADJUSTING

Correcting the tonearm's descent position during auto playback.

11.4 MOTOR OPERATING POINT ADJUSTMENT

Adjusts motor operating point for correct speed and waveform.