LEM K3 Active User Manual

Index
Soldering point.
M ale connector.
Fem ale connector.
M/F faston connector.
Test point.
Supply voltage.
Logic supply ground.
Analog supply ground.
C hassis ground.
Earth ground.
Flag joined w ith one or m ore flags
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SERVICE MANUAL
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CODE: 270222
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Warnings
w ith the sam e signal nam e inscribed.
Address
ATTENTION
O bserve precautions w hen handling electrostatic sensitive devices.
Notice
Service m ust be carried out by qualified personnel only.A ny tam pering carried out by unqualified personnel during the guarantee p e rio d
w ill forfeit the right to guarantee.
For a correct operation of the instrum ent, after having sw itched off, be careful to w ait at least 3 seconds before sw itching on again.
To im prove the device's specifications, the schem atic diagram s m ay be subject to change w ithout prior notice.
All com ponents m arked by this sym bol have special safety characteristics, w hen replacing any of these com ponents use only
m anufacturer's specified parts.
The (µ) m icro sym bol of capacitance value is substituted by U .
The (
Ω
) om ega sym bol of resistance value is substituted by E .
The electrolytic capacitors are 25V dc rated voltage unless otherw ise specified.
All resistors are 1/8W unless otherw ise specified.
All sw itches show n in the "O FF" position. A ll D C voltages m easured to ground w ith a voltm eter 20K O hm /V.
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T e c h n ic a l S p e c ific a tio n s - B ia s A d ju n tm e n ts - B lo c k D ia g ra m
In p u ts B o a rd s
6 0 0 W P o w e r A m p lifie r A s s e m b ly (K 6 A c tiv e )
3 5 0 W P o w e r A m p lifie r A s s e m b ly (K 3 A c tiv e )
Spare Part List
S e c o n d E d itio n

LEM K3 Active Specifications

General

Brand	LEM
Model	K3 Active
Category	Amplifier
Language	English

Summary

Warnings and Safety Notices

General Service Notice

Safety, handling, and component notes for proper service and operation.

Electrostatic Discharge Precautions

Precautions for handling electrostatic sensitive devices.

Technical Specifications

Bias Adjustment Procedure

Adjustment Steps

Step-by-step guide to adjust bias settings using specific test equipment.

Block Diagram

Inputs Board Schematics

Inputs Board (K6 Active)

Schematic diagram for the K6 Active model's input board.

Inputs Board (K3 Active)

Schematic diagram for the K3 Active model's input board.

600W Power Amplifier Assembly

600W Amplifier Board Circuit A

Circuit diagram for the second and third floating and ground positive stages.

600W Amplifier Board Circuit C

Circuit diagram for the second and third floating and ground negative stages.

600W Amplifier Board Circuit B

Circuit diagram for the first stage, protections, and supply.

Filter Board

Schematic for the filter board component.

350W Power Amplifier Assembly

350W Amplifier Board Circuit B

Circuit diagram for the first stage, protections, and supply.

350W Amplifier Board Circuit A

Circuit diagram for the second and third floating and ground positive stages.

350W Amplifier Board Circuit C

Circuit diagram for the second and third floating and ground negative stages.

Filter Board

Schematic for the filter board component.

Spare Parts List

Component Legend

Explanation of codes used in the spare parts list for K3, K6, US, and EU versions.

Spare Parts Categories

Detailed listing of spare parts categorized by Optional Accessories, Accessories, Cabinet, Speakers, and Boards.