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Pioneer PL-990 User Manual

Pioneer PL-990
24 pages
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Add A PreAmp On/Off Swith
to Pioneer PL-990
(ca. 2014 Model)
D. MCDONALD
14-FEBRUARY-2016

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Pioneer PL-990 Specifications

General IconGeneral
Type-
Product colorBlack
Weight and Dimensions IconWeight and Dimensions
Depth342 mm
Width420 mm
Height100 mm
Weight2650 g

Summary

Turntable Preamp Background

Built-in PreAmplifier Functionality

Explains the turntable's integrated preamp and its utility for line-level inputs.

Reasons for Switch Necessity

Details scenarios where a switch is beneficial, like vintage amp compatibility or custom preamp use.

PCB Switch Provision

Notes the turntable's design includes provisions for an On/Off switch on the PCB.

A LOOK AT WHERE THE SWITCH SHOULD BE

Accessing the Switch Area

Guides on removing the top cover and platter to access the internal components.

Visualizing the Switch Position

Shows the PCB, highlighting the intended location for the switch and its absence.

WHAT TO DO (SUMMARY)

Key Modification Steps

Outlines the overall process: dismantle, jumper changes, switch installation, and reassembly.

MY MODEL IDENTIFICATION

Pioneer PL-990 Details

Provides manufacturing date, origin, and model number for user reference.

DISMANTLE THE TURNTABLE

Platter Removal Procedure

Details how to detach the platter by unhooking the drive belt.

Securing Loose Components

Instructions for managing movable parts like the tone arm and 45 adapter during disassembly.

Bottom Case Removal

Explains how to remove the turntable's bottom plastic case by unscrewing it.

LOCATE THE AMPLIFIER BOARD

Amplifier Board Access

Describes removing screws to gain better access to the main amplifier circuit board.

ABOUT THE SWITCH CONNECTIONS

PCB Signal Designations

Identifies key contact points (S1, S2, S3) on the PCB relating to signal paths.

REMOVE 2 JUMPERS FROM THE PCB

Removing Bypass Jumpers

Details the removal of jumpers JR17 and JR18 that bypass the switch functionality.

ADD 2 JUMPERS TO THE PCB

Adding Input Signal Jumpers

Explains the process of adding jumpers (J1, J2) to connect unamplified signals.

Jumpers Installed Confirmation

Visual confirmation of the jumper installation for unamplified input signals.

INSTALL AN APPROPRIATE SWITCH

Switch Installation

Shows the physical installation of the new switch onto the circuit board.

REASSEMBLE THE TURNTABLE

Final Reassembly and Connection

Guides on reassembly and how to use the modified turntable with the new switch.

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