Philips-MX-740-Service-Manual电路原理图.pdf
SURROUND RECEIVER Service TABLE OF CONTENTS Page Location Boards / System info . 1-2 Technical Specification . 1-3 Service Tool / Measurement setup / Safety . 1-4 Warning / Handling Chip components . 1-5 Abbreviations . 1-6 Instruction for Use . 2-1 Wiring diagram . 2-18 Block diagram . 3 Service Test program . 4 Dismantling hints / Service positions . 5 Front Board . 6 Tuner 95 diagram . 7A Dolby Pro Logic Board . 8 Mains Board . 9 Mono Board . 10 . Exploded view 11 Partslist Exploded view . 12 Electrical partslist Mono Board . 13 Safety regulations require that the set be restored to its original condition and that parts which are indentical with those specified be used. Copyright 1995 Philips Consumer Electronics B.V. Eindhoven, The Netherlands All rights reseed. No part of this publication may be reproduced, stored in a retrieval system or transmitled, in any form or by any means, electronic, mechanical, photocopying, or otherwise without the prior permission of Philips. - Published by MD 0009 Service Audio Printed in the Netherlands Subject to modification 31 04 21 5 50040 *C PCS 102 412 PHI LI PS 1-2 LOCATION OF PRINTED CIRCUIT BOARDS - - -. .- W. , .“ , . . -_ '_. - g A-. . . IO Board - SYSTEM INFORMATION PCS 102 413 Receiver Front speaker MX740122 include : Center speaker FR740100 Surround Speaker 2 x Home Cinema Speaker 60W Home Cinema Center Speaker 60W 2 x Home Cinema Surround Speaker 60W General Dolby Pro Logic Mains voltage : 230V Mains frequency : 50Hz Power concumption : 1 2W at stby Dimension : 138x435350 mm Remote control : RC2526 Amplifier Output power Stereo mode (L+R) :2x60W DIN (1 kHz, 0,7%THD, 6Q) Surround mode L+R : 2x60W (1 kHz, O,7%THD, 6Q) Center : 60W (IkHz, 0,7%THD, 6Q) Surround Left+Right : 2x60W (1 kHz, 0,7%THD, 6Q) Distortion (5W) I kz : r 0,05% 40Hz - 20kHz: : 1 0.2% Headphone : 6,3mrn stereo jack with switch Output level : 3V EMF, 60Q Crosstalk between source -1 kHz : r -65dB (1w) 250Hz - 10kHz : r -60dB Crosstalk between channels -1 kHz : r -55dB (1W) 250Hz - 1 OkHz : r -50dB Frequency response : < 10Hz - 23OkHz (-ldB) Power stage protection : Shortcircuit : DC (Vout 21 OV) for +I sec Temperature : Transformer (2140' Celcius) : Heatsink (t140° Celcius) Audio Selector Input sensitivity CD : 250mV impedance 2 47kQ CDWAPE : 250mV impedance 47kQ VCR : 250mV impedance 2 47kQ n/ : 250mV impedance 2 47kQ 6 CHI DVD : 250mV impedance 2 47kQ Output level CDRrrAPE : 250mV impedance 5 1 kQ VCR : 250mV impedance 5 1 kQ Output level (variable) Center pre-out : 800mV impedance 2 1 kQ Subwoofer pre-out : 800mV impedance 5 1 kQ Tone controle Loudness (volume r -20dB Ref: 1 kHz=OdB) : 100Hz +6 dB : 10kHz +2,5 dB Tone control (Ref: 1 kHz=OdB) : Bass 100Hz -9dB i+9dB : Treble 10kHz -9dB i+9dB Hall : Lt , Rt into Left, Surround, Right Stereo bypass from : Lt , Rt into Left, Right Dolby Pro Logic decoding : Lt , Rt into Left, Right, Center, Surround Dolby 3 Stereo decoding : Lt , Rt into Left, Center, Right Center phantom decoding : Lt , Rt into Left, Right, Surround (Phantom = no center speaker) Surround delay : variable (1 5 - 30 msec) Center mode : Large, smal, phantom Testtone Tuner - (Tuner95) RDS : Only in 100 FM Tuning range IF frequency Aerial input Sensitivity at 26dB SIN Selectivity at 300kHz lmage rejection Distortion at RF=l mV,dev.75kHz -3dB Limiting point Crosstalk at RF=lmV,dev.40kHz MW Tuning range Grid IF frequency Aerial input Sensitivity at 26dB SIN Selectivity at 9kHz IF rejection lmage rejection Distortion at RF=50mV,m=80% LW only in 100 Tuning range Grid IF frequency Aerial input Sensitivity at 26dB SIN Selectivity at 9kHz IF rejection lmage rejection Distortion at RF=50mV.m=80% 10.7MHz f25kHz 75 Q coaxial 5 2pv t 55dB r 1 OOdB 5 0,8% r2pv 235dB : 531 - 1602kHz : 9kHz : 450kHz II kHz : Frame aerial : < 1,5mVlrn : 2 23dB : 2 50dB : 2 33dB :<3% : 153 - 279kHz : 3kHz : 450kHz 11kHz : Frame aerial : <2,8mVIrn : 2 26dB : t 100dB : t 45dB : 13%dB DSC settings 100Hz 1 kHz 10kHz Personal dB O O O Movie dB +4 +2 +4 Speech dB - 4 + 1 - 2 Music dB +4 - 1 +2 Multimedia dB + 7 +3 +6 PCS 102 414 SERVICE TOOL Dolby Prologic Test Disc . . . 4822 395 1021 6 MEASUREMENT SETUP Tuner FM Bandpass DUT 250Hz-15kHz LF Voltmeter RF Generator e.g. PM5326 - - - - - - - - 1 + IN and distortion meter Use a bandpass filter to eliminate hum (50Hz, 100Hz) and disturbance from the pilottone (19kHz, 38kHz). Tuner AM (MW, L W) Bandpass LF Voltmeter e.a. PM2534 RF Generator DLiIçIOC 1 dj/ and distortion meter e,g. Sound Technology ST1700B To avoid atmospheric interference al1 AM-measurements have to be carried out in a Faraday's cage. Use a bandpass filter (or at least a high pass filter with 250Hz) to eliminate hum (50Hz, 100Hz). SAFETY 8 regdations require that the set be restored to its original condition and that parts which are identical with those specified be used. Safety components are marked by the symbol A a Les normes de sécurité exigent que I'appareil soit remis à l'état üorigine et que soient utilisées les pièces de rechange identiques à celles spécifiées. Les composants de sécurité sont marqués a SAFETY Veiligheidsbepalingen vereisen, dat het apparaat in zijn oorspronkeliijke toestand wordt teruggebracht en da! onderdelen. identiek aan de gespecificeerde, worden toegepast. De Veiligheidsonderdelen zijn aangeduid met het symbool A Le norme di sicurezza estigono che I'apparecchio venga A a rimesso nelle condizioni originali e che siano utilizzati i a pezzi di ricambiago identici a quelli specificati. Bei jeder Reparatur sind die geltenden Sicherheitsvor- COmponenty di sicurezza 'On0 marcati con a schriiten zu beachten. Der Originalzustand des Gerates darf nicht veranderi werden. Für Reparaturen Sind Original- ersatzteile zu vewenden. Sicherheitsbauteile Sind durch daç Symbol A markiert. PCS 69 733
