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Luxman C-900u, Owner'S Manual

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Luxman C-900u Owner'S Manual Download Page 34

32

Before Asking for Repair Services

Problem

Cause

Solution

The loudness function does not 
work.

·  The line straight switch is set to ON.

·  Set the line straight switch to OFF.

The external pre switch does 
not work.

·  To prevent malfunction, holding down for 

approximately 1 second shall be required 
for switching between ON and OFF in the 
specifications.

·  Hold down the external pre switch for ap-

prox. 1 second.

Summary of Contents for C-900u

Page 1: ...Owner sManual CONTROL AMPLIFIER C 900u...

Page 2: ...Contents Precautions 1 Features of This Unit 2 Names and Functions 4 Connections 12 Operations 18 How to use Remote Control 20 Block Diagram 27 Specifications 30 Before Asking for Repair Services 31...

Page 3: ...es including hum may be generated resulting in an adverse S N ratio The sound is not generated shortly after the power supply is turned on This amplifier is equipped with a time muting circuit in orde...

Page 4: ...newest version 4 0 has achieved the low impedance and high S N ratio of the transmission circuit thanks to 4 par allelized first stage and Darlington connected second stage of the amplification circui...

Page 5: ...rminal manu factured by Neutrik Remote control RA 20 The remote control is encased in aluminum Tactile switches will satisfy users with solid click feeling Tactile switches will satisfy users with lig...

Page 6: ...nput transition by rotating clockwise LINE 1 LINE 2 LINE 3 BAL LINE 1 BAL LINE 2 BAL LINE 3 LINE 1 Input transition by rotating counterclockwise LINE 1 BAL LINE 3 BAL LINE 2 BAL LINE 1 LINE 3 LINE 2 L...

Page 7: ...be sure to use a pre amplifier equipped with the sound volume adjustment function as a relay generate sound through the speakers with volume lowered and adjust the volume to your favorite level 7 Out...

Page 8: ...n this control is set to the center position flat frequency characteristic is obtained Rotating this control clockwise causes the low frequency range to be enhanced and rotat ing this control counterc...

Page 9: ...CONTROL AMPLIFIER C 900u 7...

Page 10: ...the remote control is set to ON 4 Balance indicator BAL Lights up when the balanced output terminal is selected for the output mode 5 Standby indicator STAND BY Lights up when the main power switch o...

Page 11: ...en the external pre switch is set to ON 11 Line straight indicator LINE STRAIGHT Lights up when the line straight switch is set to ON When the line straight switch is set to ON the loudness function c...

Page 12: ...r or an AV amplifier Incoming audio signals are provided directly from the unbal anced output terminal External pre input signals are not affected by the volume control of this unit 4 Remote output te...

Page 13: ...ced input of an output device such as a power amplifier with a balanced cable Audio output signals are selected with the output mode se lection switch BAL LINE 1 and BAL LINE 2 have the same quality F...

Page 14: ...nections Normal stereophonic reproduction CD SACD PLAYER L R L R L R L R L R L R POWER AMP 1 POWER AMP 2 L R L R L R L R SPEAKER SYSTEM 1 L R SPEAKER SYSTEM 2 L R REMOTE REMOTE CD SACD PLAYER CD SACD...

Page 15: ...ment exercise extra care not to conduct wrong connection between the right and left channels If the right and left channels are connected reversely the localization of sound images is deteriorated thu...

Page 16: ...14 Connections Bi amplifier stereophonic reproduction POWER AMP LOW POWER AMP HIGH L R L LOW L HIGH R LOW R HIGH L R L R SPEAKER SYSTEM REMOTE REMOTE L R CD SACD PLAYER CD SACD PLAYER CD SACD PLAYER...

Page 17: ...the pin plug cables is inadequately con nected noises including hum may be generated resulting in an adverse S N ratio Surely insert the connection plug The LINE 1 L terminal is provided for low frequ...

Page 18: ...16 Connections External pre reproduction L R POWER AMP 1 POWER AMP 2 SPEAKER SYSTEM 1 L R SPEAKER SYSTEM 2 L R REMOTE REMOTE AV AMP PRE AMP L R L R...

Page 19: ...reversely the localization of sound images is deteriorated thus failing in normal stereo playback If the grounding of the pin plug cables is inadequately con nected noises including hum may be generat...

Page 20: ...lance control The balance control allows users to adjust the balance of sound volume between right and left channels When the balance adjustment is not required the balance control is set to the cente...

Page 21: ...NPUT LINE 1 OUTPUT MODE UNBALANCE BI AMP L Hi 0dB R Hi 0dB BAL PHASE INPUT 1 2 3 3 2 OUTPUT 3 2 BAL INVERT NORMAL DIMMER MAX under normal conditions ZOOM OFF LOUDNESS OFF LINE STRAIGHT OFF EXT PRE OFF...

Page 22: ...ch on the rear panel is turned on to set this unit to the standby state and this switch is turned on this unit is set to the operation state 2 Input selector LINE 1 LINE 2 LINE 3 BAL 1 BAL 2 BAL 3 Sel...

Page 23: ...nput output muting circuit is activated to mute sound during toggling the balanced phase between NORMAL and INVERT 5 External pre switch EXTERNAL PRE Input selector switch to select the external pre i...

Page 24: ...nced phase is not changed press the PRE SET switch to exit from the preset mode 2 Press the ENTER switch 3 and 2 of BAL 1 blink to show that the BAL LINE 1 phase inversion setting of the balanced inpu...

Page 25: ...ss the ENTER switch to determine the changed set ting 3 and 2 of BAL OUT blink to show that the BAL LINE 1 and BAL LINE 2 phase inversion settings of the balanced output can be performed 8th line of F...

Page 26: ...show that the level of the L Hi channel can be adjusted 2nd line of Fig 2 3 Pressing increases the sound volume of the L Hi channel in steps of 1 dB Pressing decreases the sound volume of the L Hi cha...

Page 27: ...e low level Every time this switch is pressed the loudness setting tog gles between ON and OFF repeatedly The loudness indicator lights up when the loudness switch is on When the line straight switch...

Page 28: ...as shown in the illus tration on the battery case in consideration of the polarity and 3 In the reverse order of battery cover removal put the battery cover back to the opening of the remote control a...

Page 29: ...igh BAL 1 R BAL 2 R 1 2 3 1 2 3 POWER SUPPLY INPUT SELECTOR BI AMP LINE BALANCE BALANCE BALANCE LINE BI AMP 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 LECUA 1 LECUA 2 REG ODNF 1 LECUA 1 LECUA 2 REG ODNF 4 LECUA 1...

Page 30: ...ROM INPUT SEMICONDUCTOR SWITCH SEMICONDUCTOR SWITCH 0dB TO OUTPUT DIFFRENTIAL AMP ATTENUATOR CONSTRUCTION ATTENUATOR CONTROL B1 LECUA1000 ATTENUATOR AMP EACH CHANNEL REG ODNF INPUT MUTE B2 11dB 22dB 3...

Page 31: ...CONTROL AMPLIFIER C 900u 29 REGULATOR FOR AMP FROM POWER SUPPLY POWER SUPPLY B B FROM POWER SUPPLY RECTIFIER RECTIFIER RECTIFIER FOR AUDIO FOR ACCESSORIES FOR MICROCOMPUTER GND GND...

Page 32: ...0 k Frequency response LINE 0 0 1 dB 1 V output 20 Hz 20 kHz load 50 k 0 3 0 dB 1 V output 5 Hz 120 kHz load 50 k BAL LINE 0 0 1 dB 1 V output 20 Hz 20 kHz load 100 k 0 3 0 dB 1 V output 5 Hz 120 kHz...

Page 33: ...or is not set to the source to be reproduced Set the input selector to the source to be reproduced The connected output terminal does not match the selected output mode setting Adjust the output mode...

Page 34: ...line straight switch is set to ON Set the line straight switch to OFF The external pre switch does not work To prevent malfunction holding down for approximately 1 second shall be required for switch...

Page 35: ......

Page 36: ...LUXMAN CORPORATION JAPAN AG00987E23A Printed in China...

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