SERVICE MANUAL
Contents
1. R110 1016 C1104 91196 R1109 gt E Riso 5 R1108 E 01105 2 ue 01103 1103 KOM MK RM y gt 01101 8 5 1 cno HER rt S IS 01107 i C1105 o R1113 R1111 onos YY 2 See gt C1106 1104 PB 1013 1021 1019 2 1019 9408 0401 R401 C Q401 71 R426 E B R428 TE X 402 lt R424 x 6594 L T BB R420 0407 9410 F R422 0403 pi 0405 R407 H o R408 a L Ki S R423 C409 a 33 C407 C410 a 7 SS R416 TA bn om 0406 R417 cu LF da Sas E E x B B PB 1020 4 e B G s _ 503 C509 B C51 X Ow 3 8 E l in 2 1 0 R503 R502 C506 C512 EL A gg ETS Fs R501 R504 i D LI osos Mas a B f 0538 4 ri 2 pD pe 8 P B 1020 R505 Q502 D504 R506 C508 C507 LINDAID XOVAGAAHA ML LVDAN DA OV TINA HSNA TIATAL SAAI X dNd dNd ITyd 0190 607d 5070 AYTAC 21 Na J 11 8070 14040 90470 20 0 X NdN NdN TINA HSMA TIJIAL 7070 NMOLVSNAINOD ANNLVNAAWEL HHIATTAWNV TVILNAHHAHITG UNOJAS A8S9 145440 DA OWIZ coed 2060 q e Fi2. 0701 0701 gt 707 cm u 706 g mT D702b zn caw YYS sis 2 E Dr 5 gt rm ___ o En 3 4 5 3 44 El 4 2 e 3 lt PB 1014 C704 705 __R103a 101 RIE 77 R106a_ 103 103 107 Rios C104 Q102b D101b 44 R105b R103b R102b Q102a VR101b R105a 3 Q101b x PB 1015 PB 1016 R807b R804b R502b C805 gt J RN 1 VR801b TE q s R805b gt 3 aga VR802b x ne 0804 e RBO RETS a C8052 h 0802 fg 0801 VRBOla 5 5 R8969 2 s R5052 l C801 caos tt FG sos 0807 sos 5 R 303 als 2723 R808 0806 086 gt CPS ER ta gen w aw 516725 123222 x aio Sig gt en gt B 9 3 e 2 W EII rE 2 Ss 1 g 3 100 8 at na 2 a 3 EC A gt elz 5 Ej 12 OT 8 18 18 4 2 a 0 ALKA XN 3 a gt ez Qami B 8 2 2 gt 5 41 1 Si 2 2 x z el g 5 2 8 R822 amp jis 801 R82 3 PEA 2 7 45 6 7 8 9 10 1 12 13 HM 0 I S el TEN aN i
3. i MITU HJIH A 010 l x ee ei 41014 ma unse ware J 1 s Bite tt 1 INTI 2 kp bee und II U _ mal o 1051900 PO MU mw MC I aan MECO AO emase u s KI 0004 MITI wien wnn 0 fil 98 LT i ULLI A Ga Sl 4 ao th Y
4. AZT NAN 100 ZOTO 1070 LSNraV INauuno s TOTO IV 2060 j T LndNI YUJLATIANV 15 4 49078 000 W AID0MN SYMBOL NO 108 VR10la b ClOla b 2 2uF 250V VD1221 R102a b 102 2 2uF 35V BZ120 103a b 103 220uF 16V BZ120 104a b 104 220V 16V 105a b Q10la b 2SC1745 en 102a b 2801745 PB1014 a 100K B 2 4 7uF WG713 xl a 4 7uF WG713 X2 b 10uF WG713 xi a 10uF WG713 X2 b 4 7uF WG713 X1 a 10uF WG713 X2 a 10uF WG713 X2 b O luF WG713 X2 a 330uF WG713 Y2 b 330uF WG713 a b 330uF HiFi specialYl a b 330uF 25C734 25 734 25 734 25 734 25 734 25 734 1013 SYMBOL NO 1011 SYMBOL NO a b 50K B R821 562 0806 25 734 a b 180K 822 392 807 a g 2SA561 a b 180K 823 280 808 a g 2SA561 a b 4 7K 824 196 809 a g 25 734 22K 825 140 810 a g 25 734 a b 82K 826 97 6 8ll a g 25C734 a b 10K 827 239 812 a g 25 734 18K SE 6 8K C801 100uF 35V D801 a b WG713 l 2 7K 802 0 luF 802 a b WG713 820 803 100uF 35V 803 BZ192 820 804 0 luF 805 a g WG713 1 2M 805a b 4 7uF 25V 806 a g WG713 1 2M 806 luF 25V 807 a g WG713 AR 807 0 022uF 808 a g WG713 808 10uF 25V 4 7K 809 104 25V 4 7K Q801 a b 25 734 56K 802 a b 25 734 56K 803 a b 25 734 22 804 a b 25 561 22K 805 a b 25 734 10 14 3Y 0401 25 1904 2X 10 IW 1 402 2S
5. PB 1016 L E D BOARD MUTING PB 1013 SWITCH BOARD ZERO D C OFFSET IDLE ADJUST AND ZERO D C OFFSET IDLE CURRENT IDLE CURRENT 100 mA TO OUTPUT SP TERMINALS IDLE ADJUST ZERO ADJUST ZERO ADJUST lt PB 1011 PB 1011 R826 2 Sn reihen gt etz O t me sie 2 2216 es ia x JO 4 2 s je 4 a 3 gt x 5 e 5 gt as 4 5 gt 8 gt a se e x a z OF z SE a x u e e 5 2 3213 2 21 je 152 o 5 2 1 Y 3 SER ER si ajo 3 ZID ao Sia 3 3 2 8 1 4 e Al gt 5 4 E 2 al 45 z Q8104 gt 2 R8133 G e b 2 moD a El El Td Eb 8129 2 gt 8 fur a 5 5 5 2 ale y Us 6 3 8 3 8124 R823 2 Ra 98074 x 8 2 R824 aa PB 1015 101 Q101a R101a R101b PB 1014 702 C702b 701 16 R7012 R701b _ a R703a R703b 8 708 709 5 R705a in a i i D7058 p 4 D705b IN I D706e D706b
6. and the emitter of the both transistors are connected to power supply through a common resistor The base of 0301 accepts the input signal while that of 0302 accepts the feed back signal Due to adoption of the two transistors of the same standard equivalent current is available at collector and emitter when the same signals are fed to the base of the both transistors As emitter current for two pieces of resistors will flow through the emitter resistor the emitter potential will rise up accordingly which corresponds to negative feedback On the other hand if subtle potential may appear at the speaker terminals by the drift of transistors caused by other factors but signals for instance the raise up of temperature this potential is led to the base of 0302 via the feedback circuitry when signal of the same phase will appear at the emitter resistor In this case the potential at the emitter resistor of Q301 varies to which reduces the collector current to have potential at collector The voltage is amplified by the 2nd differential amplifier Q303 Q304 which makes the potential stable at the speaker terminals and makes it possible to keep balanced 0 potential The second differential amplifier operates same as the first one though not perfectly Symmetrical The constant current drive by Q305 is applied since this stage aims at voltage amplification The emitter follower circuit is arranged annexed to the differentia
7. high as possible in the range of the safety operation The protection circuits of the M 4000 have to be designed not to be mis functioned by the current of music reproduction signal As to the over current sinsing when excessive current which may break the power transistors appears the current is once restrained electronically to keep the operation of the power transistors in the 5 0 Safe Operation Area And in case the restraint time lasts over a certain time the mains power is shut off by fuses Other protection circuits are if D C Drift Sensing This protects the speaker system by cutting off the output when some is detected at the speaker terminals This also operates as the muting circuit which ptotects the speaker system from transient phenomena caused by the mains being turned on Power Transistor Failure Sensing This shuts off the mains power when even fuse of any power transistors is ruptured Abnormal High Temperature Sensing This shuts off the mains power when the temperature at the heat sink is over 80 C under hard driving for a long time Thus the M 4000 is equipped with 4 protection circuits One is for protection of speaker systems and the other three are for protection of the amplifier PB 1020 POWER SUPPLY FOR P B LOCATION DRIVER STAGE si es DRIVER L ch DRIVER R ch PB 1019 PB 1019 POWER BOARD PB 1021 PB 1011 PB 1014 V U METER N PB 1015 VOLUME
8. C1745 2v 10 1 2W 1X 403 2SA855 2Y 0 18 SW IX 404 25 783 12 10 1 24 3x 405 254483 32 0 18 5W 2X 406 250424 17 10 IW 3X 407 2SD424 1X 0 22uF 250V 2x m 250626 409 258554 3Y 330uF 25 2X 410 258554 3X 3200pF 22 411 258554 3X 3900pF 2Z 33uF 16V 2V D401 SV02 2X 4 7pF 50 2Y 402 1N4448 2Y 33uF 16V 2Y 403 1N4448 2Y 4 7pF 50V 2Y 404 154448 2 0 022uF 250V 405 144548 2Y pa F401 6 3A 1X 402 6 3A 3X O luF 250V 2X luF 50V 22 O luF 250V 2X PB1020 25 783 2SA483 2X 1N4003 1X 1N4760A 1X 1N4003 2X 1N4760A 2X 220uF 100 1Y 2RB40 2Y 220uF 100 33uF 100V 1Y O luF 50V 1X 0 5A 0 5 21 SYMBOL NO 25 234 25 734 1N4002 1N4448 8 2K 1 011011 280734 1Y 1 5K 1y 1102 25 234 1X 8 2K 1y 1103 25 734 1x 1104 2SA561 IX 1105 25 734 1X 11061 25 734 1x luF 250V 2Y 1107 25 734 1Y 9 18 250V 2 1108 25 734 1y 100uF 25 2Y 0 OluF 250V 2 1101 154448 2v 100uF 25V 1Y 1102 1 4448 1y l0uF 50V 1Y 1103 2SRB10 1x 100uF 25 1Y sama lt 4 7uF 50V 1102 oY PB1018 33K 1W 2SA810 4 7uF 25V 254810 280805 4 7uF 250V 280805 330pF 50V 2SA762 1000pF 100V 2SC1431 220pF 25 1431 220uF 16V 0 22uF 250V 1N4448 1000pF 100V 154448 47 100 5702 47 100 svo2 O luF 250V 33uF 100V 0 11 250V 33uF 100V 100pF 100V 0 22uF 250V O luF 250V O luF 250V 150pF 100V 0 5A 0 5 SPECIFICATIONS Power Output 180
9. ULTIMATE HIGH FIDELITY STEREO COMPONENT SERVICE MANUAL 6 L R CG DU it DESCRIPTION Emitter Follower Circuit tower Lircult Output signals of a control amplifier etc are led to the input terminals MAIN IN of this power amp and level controlled at the input level control of a detent volume equivalent to the high grade attenuator with 22 contact points of 1dB decrement Then fed into the Emitter Follower circuit which is different from the ordinary one composed by two transistors 0101 and 0102 The former is for emitter follower and the latter is for the constant current drive of the emitter follower of 0101 Signals are impedance converted through this circuit and therefore electrical isolation is made between the output stage of a control amp and the pre driver circuit of this amplifier to eliminate interference between both circuits Thus stable amplification with low distortion is attained Pre Driver Circuit Ir FIVE SA E CUTE Signals coverted into low impedance at emitter follower circuit are then fed to the two stage differential amplifier a kind of balanced DC amplifying circuit to meet voltage amplification The differential amplifier is always stable against possible fluctuation of mains voltage and temperature drift and has been widely used as Operational Amplifier with IC s in computors or measurement instruments etc The two transistors 0301 0302 for the lst stage differential amplifier are arranged quite symmetrically
10. e also exclusive for LUXMAN is arranged at the complementary driver stage Thus sufficient driving of various type of the speaker system is feasible With the M 4000 the total collector dissipation of the power transistors in each channel is 450W and the collector emitter breakdown voltage is 180V The power supply for the final stage and the complementary driver stage is quite independent for the left and right channels which ensures the same power output at each channel whether both channels are driven or single channel is driven But bear in mind that when the full power output is fed into 4 ohm loads a slight difference amy be possible due to the regulation of the commercial electric power Protection Circuit The OCL circuit in which the speaker system is directly connected to the amplifier is ideal in the point that the input signal is delivered most faithfully But this circuit is always accompanied by the danger that any abnormal factors aroused in the amplifier will be delivered to the speaker system without barrier On the other hand electronic components will increase in its number in proportion with improvements of the circuit design and it is hard to foresee every trouble that may happen even if the most severe selection is made of the superior components Necessity is here to have the protection circuits The most important in the operation of the protection circuit is reliability and speed Therefore the sensitivity should be as
11. l amplifier with a pair of Q306 and Q307 which electrically isolates the Class A operation at the differential stage and the Class B operation at the power amp stage Q306 is for the emitter follower and Q307 is for its constant current driving Therefore impedance fluctuation caused by the speaker loads would not affect the pre driver stage With this pre driver stage stable driving with low distortion is feasible up to high frequency range with smaller phase compensation comparing with conventional high power amplifiers As for the power supply circuit for Class A operation section up to the differential stage a real automatic voltage regulator is adopted to avoid bad influence witch may possibly be caused by the fluctuation of AC mains voltage or the current fluctuation in the power amplifier section Bias Circuit The adjustment of the quiescent current at the final stage is made by a thermal diode and the transistor 0401 These components directly touch the heat Sink and compensates the excessive heat and the temperature drift Power Output Circuit Adopted is a pure complementary push pull circuit composed by the power transistors of NPN group and PNP group which are all specially developed for LUXMAN In order to produce such a high power of 180W ch triple push pull stages utilizing 6 power transitors designed for high power output are arranged at the final stage And the push pull stage utilizing driver transistor which ar
12. watts minimum continuous per channel into 8 ohm loads both channels driven at any frequency from 20Hz to 20 000Hz with no more than 0 05 total harmonic distortion Rated I M no more than 0 05 180W ch 60Hz 7KHz 4 1 Frequency Response 3 100 000Hz 1dB Input Sensitivity 1V 8 ohm 180W ch 1KHz Input Impedance SOK ohms Residual Hum amp Noise 108dB Crosstalk better than 90dB vol max 1KHz better than 70dB vol max 20KHz Dimensions 485 W x 390 D x 175 H mm 19 1 8 x 15 3 8 x 6 7 8 Weight Net 28Kgs 62 lbs Gross 31 68 lbs Specifications and appearance design subject to possible change without notice LUX CORPORATION JAPAN HEAD OFFICE amp FACTORY 1 8 31 NAGAHASHI NISHINARI KU OSAKA PHONE 632 0031 CABLE LUXELECT OSAKA TELEX J63694 LUX AUDIO OF AMERICA LTD 200 Aerial Way Syosset New York 11791 U S A PHONE 516 822 7070 IQ u G l kl pez eee S kol El auey ety r i l I I l i I I I I l 2 gt E 4 Ob 1 4 Del 1 z A yo 111 101 l 101 04 l une euer J t a 8
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