Linn-LK1-pre-sm维修电路原理图.pdf

20th August 1999 LK1 Service Manual Page1 Copyright 1999 Linn Products Limited. All rights reserved. LK1 LK1 PreAmplifier Service ManualPreAmplifier Service Manual CONTENTS INTRODUCTION . 2 ABOUT THIS MANUAL. 2 RETAILER or by carrying out some checks, you may be able to narrow the fault down to the faulty IC(s) and replaced it/them only. If the symptom is cross-talk, then usually the faulty input will cross- talk to other inputs, but these inputs do not cross-talk back to the faulty one. If the symptom is loud thump, then usually the faulty input will be least affected by the fault. RadioFans.CN 收音机爱 好者资料库 20th August 1999 LK1 Service Manual Page12 Copyright 1999 Linn Products Limited. All rights reserved. Contents Crackling and/or rustling noise at the output of one channel Firstly rule out the LED fault above. Probably intermittent. Noise varies in volume and intensity. Transistor breaking down. You may be able to narrow down the fault by checking exactly what inputs/outputs are affected, whether the fault increases/decreases with volume etc. See Introduction to Fault Finding (accessible via Linfo Website - Product Information) for tips on how to trace. No output from all inputs. Happens after unit has been switched off and then on again. Backup battery (BATT1 on control board) faulty causes sound to mute completely (volume is at absolute zero) on all inputs To temporarily fix, simply turn up the volume when unit is first powered up. To fix permanently, replace the back-up battery Linn part no: MISS 011 Output of one or both channels dead on all inputs Probably constantVolume control DAC faultyReplace DAC Linn part no: IC 003 When volume is set to minimum, the music is still heard. ConstantThis is normal. The lowest volume setting of the LK1 is NOT absolute zero. If absolute zero is required, press Mute. If the lowest volume is too loud, a mod can be done to reduce the gain of the LK1 by 8dB. See LK1 Gain Modification sheet (accessible via Linfo Website - Product Information). Slight hum on both channels of MM or MC input May be intermittent and/or vary in volume or by carrying out some checks, you may be able to narrow the fault down to the faulty IC(s) and replaced it/them only. If the symptom is cross-talk, then usually the faulty input will cross- talk to other inputs, but these inputs do not cross-talk back to the faulty one. If the symptom is loud thump, then usually the faulty input will be least affected by the fault. RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库