Linn LK140 Service Manual

2
nd
June 1999
Page1 Copyright © 1999 Linn Products Limited. All rights reserved.
LK85 & LK140 Service ManualLK85 & LK140 Service Manual
Contents
INTRODUCTION .................................................................................................................................... 2
A
BOUT THIS MANUAL.............................................................................................................................. 2
R
ETAILER & DISTRIBUTOR OBLIGATIONS ................................................................................................... 2
H
OW TO USE THIS MANUAL...................................................................................................................... 2
INSTALLATION..................................................................................................................................... 3
I
MPORTANT SAFETY INFORMATION............................................................................................................ 3
I
NSTALLATION ....................................................................................................................................... 3
P
LACEMENT.......................................................................................................................................... 3
POWER-UP PROBLEMS........................................................................................................................ 4
P
OWER UP PROBLEMS ............................................................................................................................ 4
F
USE BLOWING...................................................................................................................................... 5
PROTECTION (TRIPPING) PROBLEMS ................................................................................................. 7
I
MPORTANT INFORMATION ABOUT TRIP – PLEASE READ BEFORE FAULT FINDING ON TRIP PROBLEM..................... 7
T
RIP PROBLEMS – FAULT TABLE............................................................................................................... 8
STAND-BY PROBLEMS......................................................................................................................... 9
I
NFORMATION ABOUT THE STAND-BY FACILITY ............................................................................................ 9
S
TAND-BY PROBLEM TABLE..................................................................................................................... 9
AMPLIFIER & AUDIO PROBLEMS........................................................................................................11
A
MPLIFIER & AUDIO PROBLEMS...............................................................................................................11
DC
AT THE OUTPUT...............................................................................................................................11

Linn LK140 Specifications

General

Type	Stereo Power Amplifier
Input Impedance	10 kOhms
Gain	29 dB
Signal to Noise Ratio	>100 dB
Damping Factor	>100
Input Sensitivity	750mV
Dimensions	80mm x 430mm x 345mm (H x W x D)

Summary

Installation

Important Safety Information

Provides crucial safety warnings regarding mains connections and internal voltages.

Power-up problems

Won't power up. Power LED dead & no function

Unit fails to power on with no LED indication, likely due to fuse issue.

Power LED dead

Power LED is not lit, possibly due to a faulty LED or connection.

Power LED is red

Power LED is red, indicating standby or trip status.

Won't power up - Power LED dead & no function

Unit fails to power up intermittently, possibly due to a faulty mains lead.

Doesn't power up

Unit fails to power up, possibly intermittently, due to incorrect mains voltage.

Doesn't power up or Powers up (power LED may be lit) but no function.

Unit shows power but no function, or intermittent power issues.

Unit dies intermittently

Unit does not power up or powers up & then dies

Fuse blowing

Fuse blowing - Wrong fuse type

Fuse blows intermittently, possibly due to wrong fuse type.

Fuse blowing - Mains surges

Fuse blowing - Wrong mains voltage

Fuse blows due to incorrect mains voltage setting or high voltage.

Fuse blowing - Transformer faulty

Fuse blows due to a faulty transformer, often requiring replacement.

Fuse blowing - Mains inlet faulty

Fuse blowing - Rectifier diode fault

Fuse blowing - Internal short circuit

Protection (Tripping) Problems

Trip problems – Fault Table

Amp shutting down (LED goes red, music dies) after 10 or 20 minutes.

Amp tripping

Amp permanently tripped

Stand-by Problems

Amp goes into stand-by while music is playing.

Unit never comes out of stand-by.

Unit never goes into Stand-by, no matter how long it is left with no music playing.

Amplifier & Audio Problems

No output from one or both channels.

No audio output on one or both channels, possibly with noise.

Clicking, buzzing or popping noise at output of both channels.

Output is mono, not stereo even if balance is adjusted on pre-amp, output of both channels of power amp remain equal.

Thumping/ banging noise through speakers when switching between inputs of pre-amp