Luxman 5M21 & 5M20 Power Amplifier Service Manual
Contents
1. RD0407 15 1 2W RD0407 15 1 2W RD0407 15 1 2W RD0407 15 1 2W RG0032 0 18 5W RGOO32 0 18 SW RG0032 0 18 5W RGOO32 0 18 SW 800407 15 1 2W 800407 15 1 2W 600407 15 1 20 600407 15 1 20 860032 0 18 5W 860032 0 18 SW RG0032 0 18 5W RG0032 0 18 5W r7 SYMBOL NO STOCK NO DESCRIPTION LOCATION SYMBOL NO STOCK NO DESCRIPTION LOCATION CM0023 33pF 00073 CM0023 33pF TD0073 00053 220pF TV0020 CQ0053 220pF TV0020 CQ0053 220pF CQ0053 220pF CQ0929 0 19 CQ0929 0 luF CQ0929 0 1uF CQ0929 o luF PB 1081 RD0030 RD0032 0030 RD0012 RD0038 RD0041 RD00538 3 RG0066 RD0056 RGO066 RD0036 RG0068 RD0027 RGOO68 RD0027 RGC067 RD0032 RG0067 RD0043 SYMBOL NO STOCK NO DESCRIPTION LOCATION CE0095 100uF 35 TROOO1 CE0315 100uFBP 25V E 0001 0315 100uFBP 25V 001 CE0069 100uF 10V E TR0001 CE0100 lOuF 50V E TR0007 CQ0115 0 22uF MI TR0001 CQ0115 0 22uF MI TRO118 TR0001 SYMBOL NO STOCK NO DESCRIPTION LOCATION L501a LA1015 choke LUX1081 501b LA1015 choke LUX1081 PB 1081 D501 TD0072 502 TD0073 503 TD0002 PB 1081 25 734 25 734 25 734 25 734 25 561 25 734 250254 25 734 S2RB10 WG713 1N4002 1Y RD0354 lk 1 2W RD0117 4 7k 1 2W RD0354 lk 1 2W RD0334 150 1W RD0117 4 7k 1 2W RD0334 150 1W TD0002 1N4002 TD0002 1N4002 TD0070 1N4760A TD0070 1N4760A TD0010 WO4 CE0080 42. 00002 D0001b 000025 Doogie 00002 15 000 6 C0006a 15000 63V 15000 63V 15000 63V 15000 63V 150000 83V 15000 63V 15008x 63V 15000 63V 15000 15000 63V 15000 63 L CH LEVEL METER LEVEL METER pS SSS Se SO ee OS eee SSS SS SSeS Eee Q PB 1085 TT R7o3a 22K R701 33K Aro 56K Rma 1008 7 701a 2 1 ma Broz 5 O 2 D ITI es RR ts RT X mIRC UD MED PB 1084 O DC OFFSET LAMP Q Rao GBK zi 3 8 7 8 BI POL 2022 6 25011754 8 TJ Da i pug 254096 BI POL Q205a b 2508054 020 2508054 Jr 0 2501904 mn 2811614 Df TONS 251659 28 1080 0206 0 2 61118A l 0307 0308a b 2SA747A 8713
3. 5 21 5 20 SERVICE MANUAL 5M21 5M20 Alignment Procedure The 5M21 and the 5M20 are of DC amplifier configuration unlike conventional AC amplifiers Therefore the following items should be noted in case of the alignment procedure Don t think the same 1 2 3 4 5 6 Position 1 2 3 4 Position 1 2 3 procedure as that for the AC amplifier can be followed To apply AC mains power source with loads connected will cause blow off of power transistors if connections or wirings are imperfectly soldered Therefore check all the wirings to printed circuit boards before turning on the AC mains power This power amplifier amplifies even DC Slight DC ingredients are often present in old testing equipments or in DC amplified ones In case such DC voltage is fed to the amplifier the DC is amplified enough to give damage to the amplifier Therefore set the INPUT CAPACITOR switch provided at the back panel to the IN position before operating the amplifier 1607 2707 DC voltage is applied at the final stage amplifier board the driver stage board and the constant voltage board Especially at the power supply giant elect rolytic capacitors are employed and it takes a long time to finish discharging When you proceed to disconnect printed circuit board do it after perfect discharge by use of a resistor or a
4. 3 D302a b ELE 0303 0304 W7612 SSS SaaS SSeS SSS SSS Sees SS Sa 001 0502 50504 0508 250734 254561 0505 280234 PB 1081 328810 0502 5713 0503 104002 2501569 LUX AN lanib 2SA839 1082 Dadta b 184002 ULTIMATE HIGH FIDELITY STEREO COMPONENT hates Q701 0702 6 PB 1083 0701 0706a b 5713 STEREO POWER AMPLIFIER Q802 250836 LABORATORY REFERENCE SERIES 0 25015 1084 0007 280734 Deos 0819 6713 5M2 1 Osos 0806 2861345 Wa 562 20 Tn 50 7 100 182 SW 6800 15K Raita 15K 208 47K 208 1 5K 2200 O CIRCUIT 8 1978 d VR201a 5002 1 1 i R213 42105 1 SERE CIRCUIT VR201b ame gt ii mii ors m MEA aig m A ims cime ml me pun 18K 2 gt 6 Rstta 5 227 811 s 3 E x F7 3 x ama en PB 1082 PB 1081 270K 05046 Qa pup v pm i
5. 1084 SYMBOL NO RD0020 68k RD0020 68k RD0017 100k RD0017 100k RD0035 4 7k RD0035 4 7k RD0022 47k RD0039 2 2k RDOO35 4 7 RD0035 4 7k RD0039 2 2k RD0022 47k RD0030 10k RD0241 33 1 2W RD0030 10k RD0030 10k RD0043 lk RD0388 6 8 RD0042 1 2k RD0026 22k RD0255 12M RD0028 15k RDO255 12M RD1538 39 1 2W TR0025 TR0125 TR0125 TR0025 TRO153 TROOO1 TR0001 TD0073 TD0073 TD0073 7 5 TROO25 TROO25 7 5 TD0075 1000753 1000753 1700099 SYMBOL STOCK NO DESCRIPTION RL701 AY0002 relay MAT4BCR 2SC1345 2SA836 2SA8 36 25 1345 2SA915 2SC734 2SC734 LOCATION lt lt i 9 8 RD0019 82k 10dB 27k 20dB RD0019 82k 10dB 27k 20dB RD0013 220k RD0013 220k SYMBOL NO STOCK NO DESCRIPTION LOCATION VR601a RTOO18 100k B SR29R lY 601b RTOO18 100k B SR29R lY RGO066 RGO066 RDO151 RD0151 CHASSIS UNIT AC0013 AC Selector Socket M 1625 UE1087 Bottom Plate 1087 0014 Selector Plug 2120 061001 Bonnet 1001 0019 Fuse Holder X N1153 WA1074 Panel 1074 BF0031 Miset Fuse 1A WJ1073 Mould Knob 1073 BF0034 Miset Fuse 3A WK1091 Metal Knob 1091 BF0082 Fuse UL MF61ML 5A WN1010 Leg BF0212 Fuse 5x20 3 15A T AG AK AY BF0082 Fuse UL MF61ML 5A BF0215 Fuse 5x20 6 3A T AZ J U BK0014 AC Cord 8632 AK BK0019 AC Cord UP 057 001 AZ U BK0020 AC Cord 1263R AY
6. DML IC 2 transistors 45 Diodes 31 450W 8 ohm at maximum output 442 W x 400 D x 146 H mm 17 13 32 x 15 3 4 x 5 3 4 Net 18 8kgs 41 4 165 Gross 20 8kgs 45 8 tbs Specification and appearance design are subject to possible change without notice LUX CORPORATION JAPAN 1 1 1 CHOME SHINSENRI NISHIMACHI TOYONAKASHI OSAKA PHONES 06 834 2222 CABLE LUXELECT OSAKA TELEX J63694 LUX AUDIO OF AMERICA LTD 160 DUPONT STREET PLAINVIEW N Y 11803 U S A PHONE 516 822 7070 Printed in Japan 1 1 C DOMESTIC MODEL J Type AC OUTLET AC 100v 50 6092 U S MODEL U T ics AC 120V 50 60Hz 8 EUROPE MODEL A Type SWooarc Foote AED AC 2201 OR 2407 50 60Hz UNSWITCHED AC OUTLET DA 0002 1 UNLESS OTHERWISE SPECIFIED ALL RESISTORS ARE IN OHM WATT ALL CAPACITORS ARE IN FAPAD 2 TRANSISTORS AND DIODES MAY BE REPLACED WITH ANY TYPES HAVING COMPARABLE RATINGS 3 DUE CONTINUED IMPROVEMENTS LUX RESERVE THE RIGHT TO ALTER THE CIRCUT OR SPECIFICATIONS A B t F0003a 0 E 0004 01 E F0005b A i C 00 0 F004 F 8
7. 0025 AC Cord SAA Miniture AG 035 AC Cord 1 25mm2 VFF AR J PTO114 P 2086 A PT2117 P 2117 0 RS0092 Resistor 4 7k 2W TD0110 Diode S5VB40 F WJ0001 Setting Knob SUB PANEL UNIT REAR PANEL UNIT STOCK wo Lamp Socket No 2505 UL 60073 AC socket MD 40 AJ0016 Phone Jack LJ261 1 6 0001 Fuse Holder S N1301 AL0002 Lamp PL 38 0015 2 Pin Jack 10013 Lamp 3600 0065 SP Terminal 5572 ALO041 Lamp 12V 75MA RD0026 Resistor 22k 0028 Meter LK3H 1 200 354 Resistor 1 2W 0021 Relay MAT2 CRJ RV0140 VR 50k B 15KC SP0037 Push Switch power UC1047 Back Panel 1047 UB1027 Sub Panel WZ1038 LRS Lamp Holder 1038 SPECIFICATIONS 5 21 Power Output Rated I M Frequency Response Input Sensitivity Input Impedance Signal to Noise Ratio Residual Noise Crosstalk Damping Factor Other Features Protection Circuits Semiconductors Power Consumption Dimensions Weight 5M20 Power Output Rated Frequency Response Input Sensitivity Input Impedance Signal to Noise Ratio Residual Noise Crosstale Damping Factor Other Features Protection Circuits Semiconductors Power Consumption Dimensions Weight 100W minimum continuous per channel into 8 ohm loads both channels driven at any frequency from 10Hz to 20 000Hz with no more than 0 008 total harmonic distortion no more th
8. the DC offset is recovered Check the muting relay breaks when DC 3 5V appears at the output terminal Meter Circuit 1 Adjust the trimmer potentiometer on PB 1085 to obtain OdB indication on the meter when 2 3 4 lkHz sine wave is applied to the input of the amplifier and the output voltage is set to 28 3 Set the output voltage to 8 9V for the model whose meter sensitivity is 10dB while set it to 2 83V for the 20dB model Adjust trimmer potentiometer on PB 1083 to obtain OdB reading on the meter Repeat steps 2 3 is advisable to connect attenuator outside When the Meter Sensitivity Selector Switch is turned on applying 10Hz and 10kHz sine waves with 8 9V load voltage for the 10dB model while 2 83V for the 20dB model frequency response should be within 1dB and mutual deviation should be within 0 54 Wh UW1073 UW1072 UG1001 WC1029 AL0013 AH000 8U spacer spacer bonnet side mould plate lamp No 3006 lamp socket 0 1404 CE1407 AM0028 0191 981027 AJ0016 15000uF 63V x 2 15000uF 63V 2 x 2 meter KL3H metal knob sub panel headphone jack AL0002 WJ1073 WA1074 WN1010 UE1087 lamp PL 38 mould knob front panel leg bottom plate 5M21 REPLACEMENT PARTS LIST Resistors 1 4 watts 15 unless otherwise specified MF metal fil
9. 70uF 16V CE0080 470uF 16V CQ0005 0 1luF CQ0005 0 1uF 0109 33uF 100V CE0109 33uF 100 CE0109 33uF 100V CE0109 33uF 100V CE0127 100uF 100V CE0127 100uF 100V CE0273 220uF 100V CE0273 220uF 100V CUO012 0 01uF TR0167 2SC1669 TRO138 2SA839 C tr t tr trj tri tr t0 tr x E tn tn PB 1082 1 Es PB 1082 94 1 8 5 5 5 2 373 0 O 5 3 Jj C404b C403b 8 Ra 81 2 R401b 9 3 S o 2 2 8 3 __ cong e 407 i i 8 5 5 0 5A 250V 0 5 250 Ce RD0024 RD0040 RD0024 RD0040 RD0021 RD0056 RD0021 RDOOS6 RD0026 RD0026 RD0026 RD0026 RD0030 RD0030 SYMBOL NO STOCK NO DESCRIPTION LOCATION SYMBOL NO STOCK NO DESCRIPTION LOCATION 50009 0001 25 734 50009 0001 25 734 0100 TROOO1 25 734 0100 CS0009 CS0009 0001 25 734 SYMBOL NO STOCK NO DESCRIPTION LOCATION TDO073 00073 100073 1000753 TD0073 TD0073 TD0073 TD0075 PB 1083 PB 1084 i 1 ii 8 E TE a 1084 94 1 F 0806 27025 38 3 D qi E e C803 La 2 a Stet 53 EEEE 52 Ori D703b EE i Te es 5 d um 8 0704 O lt gt wee mae 3 807 Bi 97026 jim mani hat ios _ 06055 a0 CE0318 CE0318 CE0086 CE0144 CE0089 0089 0089
10. TE Ke sts XN gt 050 INAS 14 ts 2 E 05066 2 5 3 R E Bue lt gt ez Qs01b R501b 15045 000 1 04026 Radio Rage gt A 15016 1 7 Re 525 ce oh or ee E o on ms mice RII H Se SAE P Se C304a 200V ULTIMATE HIGH FIDELITY STEREO COMPONENT LUXMAN STEREO POWER AMPLIFIER LABORATORY REFERENCE SERIES 5 21 Ea 0 6 O P 6i Ot 6lY 1 UNLESS OTHERWISE SPECIFIED ALL RESISTORS ARE IN OHM AWATT ALL CAPACITORS ARE IN FARAD 2 TRANSISTORS AND DIODES MAY BE REPLACED WITH ANY TYPES HAVING COMPARABLE RATINGS 3 DUE TO CONTINUED IMPROVEMENTS LUX RESERVE THE RIGHT TO ALTER THE CIRCUT OR SPECIFICATIONS SPEAKERS LEFT CHANNEL PEAK INDICATOR OUT RIGHT CHANNEL
11. an 0 00896 8 ohm 60 7KHz 4 1 DC 100 000Hz 1dB 890mV 50k ohms 120dB IHF A curve input short circuit no more than 0 1mV input short circuit no more than 100dB 100Hz no more than 70dB 20 20kHz 80 8 ohm 1kHz VU meter for left amp right channels Meter sensitivity selector switch OdB 10dB Input capacitor IN OUT switch Audio attenuator for both channels Connection terminal for Peak indicator Extra AC outlet unswitched DC offset senser DC drift sensing circuit Abnormal temperature sensing circuit Excessive current protection circuit DML IC 2 transistors 49 Diodes 43 450W 8 ohm at maximum output 442 W x 400 D x 146 H mm 17 13 32 x 15 3 4 x 5 3 4 Net 19kgs 41 8 Ibs Gross 21kgs 46 2 Ibs 100W minimum continuous per channel into 8 ohm loads both channels driven at any frequency from 10Hz to 20 000Hz with no more than 0 008 total harmonic distortion no more than 0 008 8 ohm 60 7KHz 4 1 DC 100 000Hz 1dB 890mV 50k ohms 120dB IHF A curve input short circuit no more than 0 1mV input short circuit no more than 100dB 100Hz no more than 70dB 20 20kHz 80 8 ohm 1 2 Input capacitor IN OUT switch Audio attenuator for both channels Connection terminal for Peak indicator Extra AC outlet unswitched DC offset senser DC drift sensing circuit Abnormal temperature sensing circuit Excessive current protection circuit
12. ct AC cord to the output of variable transformer then slowly increase AC voltage to confirm gradual movement of the ammeter 3 Set the AC voitage to the rated AC mains voltage 4 Adjust the Bias VR to obtain 150mA idling current 5 Check the output voltage of PB 1082 power supply for driver to be 168 110 DC This can be done at the print terminal on PB 1079 6 Adjust trimmer potentiometer the driver board to obtain DC output voltage 7 Check if the normal voltage is obtained at the Speaker Protection Circuit the DC Offset Circuit and the Meter Circuit respectively Check the voltage listed on the circuit diagram 8 Check if the Stand by lamp blinks By depressing the power switch the LED for the Stand by lamp begins blinking then muting for speaker relay and relay for meter are turned on after 3 15 seconds and when the blinking stops the pilot lamp lights on Note with the 5M20 only the pilot lamp light up 9 Adjust the trimmer potentiometer on the driver board again to obtain 140mA idling current This alignment should be done 5 minutes after finishing step 4 10 Check the voltage at the output terminal to be OV DC If shifted readjust it This also should be done 5 minutes after finishing step 6 11 Set the voltage of variable transformer down to OV Wind and solder plated wire around the print terminals for adjustment of idling current 12 Gradually increase voltage of variabl
13. e transformer up to 80 of the rated AC mains voltage where power relay starts to operate Set AC voltage to the rated AC mains voltage 13 Turn off the power switch 14 Both of Speaker Muting Relay and Meter Relay DC Offset Relay for the 5M20 break at the same time 15 Turn on the power switch AC voltage at the rated AC mains voltage 16 Confirm the Stand by lamp begins blinking and 3 15 seconds later the muting relay and the meter relay are turned on to switch on the pilot lamp 17 Apply 1kHz sine wave to the amplifier and check the output voltage comes out smoothly up to 29V 18 Apply 1kHz sine wave and check the attenuator volume operates normally Alignment of Main Amp Section 1 Turn off the power switch 2 Connect 8 ohm load resistor to the output terminal 3 Set AC power supply to the rated AC mains voltage and turn on the power switch 4 After finishing the muting period gradually apply 10kHz sine wave signal Set the attenuator to MAX Hereafter the attenuator should be in the MAX position unless otherwise specified Operation shall be with both channels driven 5 6 7 8 9 10 11 12 Distortion should be no more than 0 005 at lkHz with 28 3V load voltage At this time the input voltage should be 0 89V 110 Then apply 20Hz 20kHz sine wave and check the distortion is no more than 0 008 with 28 3V load voltage Distortion should be no more tha
14. m Capacitors Crises ceramic tantalun electrolytic mylar mica styrol RD0004 RD0004 i 50158 luF CS0138 luF 550013 slide sw RD0050 RD0028 15k 1 2W RD0050 RD0028 15k 1 2W RD0028 RD0069 RD0028 RD0069 RD0009 RD0046 RD0009 RD0046 RD0020 RD0141 RD0020 RD0141 RD0028 RD0141 RD0028 RD0141 RD0028 RD01 32 RD0028 RD0132 RD0240 RD0026 RD0240 RD0026 RD0009 RDO134 800009 8001 34 RNO386 8001 34 RN0386 2001 34 RD0028 RD0028 SYMBOL NO STOCK NO DESCRIPTION LOCATION CQ0009 0 047uF CQ0009 0 047uF CQ0267 100pF CQ0267 100pF 0001 2 2 2 2pF 0 luF 0 1luF 33pF 33pF 33pF 33pF 150pF 150pF 0 1luF 0 1luF 0 luF 0 luF 0001 CQ0929 CQ0929 CM0023 CM0023 0025 CM0023 CQ0173 CQ0173 CQ0929 CQ0929 CQ0929 CQ0929 PB 1080 RD0146 RD0146 RD0362 RD0362 RD0155 RD0155 RDO139 RDO139 RDO127 RDO127 RD0362 RD0362 RD0362 RDO362 RD0134 RD0134 RD0134 RDO134 PB 1080 SYMBOL STOCK NO DESCRIPTION LOCATION Q201a TR0165 2SC1775A 201b TRO165 2SC1775A 202a TRO165 25 1775 202b TRO165 2SC1775A 203a TRO168 2SA896 1 203b TRO168 25 896 1 204 TRO168 2SA896 1 204b TRO168 2SA896 1 205a TRO116 2SC805A 2SC805A WG713 WG713 500 ohm 500 ohm 205b D201a 201b VR201a 201b TRO116 00073 00075 RTOOS9 RT0059
15. n 0 008 at 20kHz with 20V load voltage Distortion should be no more than 0 008 at 30kHz with 20V load voltage Crosstalk should be no more than 70dB at 10kHz At this time the channel with no input signal should be short circuited at the input terminals Short circuit at the input pin jakc of both channels and check if the noise level is no more than 0 lmV At the same time confirm the wave form does not contain large amount of spike or pulse products Also the noise level at the time of input open vol MAX MIN should not be larger than that under other conditions When a headphone is inserted to the headphone jack check if signals are switched to the headphone from the speaker terminals At the same time check L ch and R ch Protection Circuit 1 2 3 When 5Hz sine wave is applied to the input of amplifier and as the output of oscillator increases the DC drift sensing circuit operates in the vicinity of 22 29V output to shut off the speaker relay into STAND BY condition or it repeats ON OFF operation Load 8 ohms Attenuator Max DC Offset Test Confirm the pilot lamp turns from blue to red in case DC voltage of 20mV 5mV is applied to the input terminal or in case 500mV 200mV voltage appears at the output terminal Note that only when DC voltage is fed to the input terminal the pilot lamp turns back to blue 2 or 3 seconds after setting the Input Capacitor Switch to which shows
16. n electric bulb The power transistors section at the final stage is driven in class AB operation which is different from our conventional amplifiers driven purely in class operation Therefore check the idling current as soon as possible after turning the power switch on to protect power transistors from breakage by excessive current Our original FET hybrid I C Dual Monolithic Linear is used in the pre driver stage This I C contains differential stage constant current circuit and cascode circuit Check if the pins of the I C are correctly and perfectly connected before turning the AC mains power on The output terminals for Peak Indicator are provided in this amplifier These are taken from the Speaker Terminals through ohm resistor therefore it might be possible that the resistor burns out or the amplifier itself is damaged in case short pins etc are mistakenly inserted to these terminals to cause short circuit Note that these are not input terminals of knobs before alignment Attenuator Volume MIN Speaker Terminals Connect oscilloscope and milivoltmeter Do not connect loads AC Mains Switch Meter Sensitivity Selector Switch OFF Input Capacitor Switch ON of knobs at the time of delivery Attenuator Volume MAX Input Capacitor Switch ON AC Mains Switch Meter Sensitivity Selector Switch OFF 1 Connect a DC ammeter to power board PB 1080 for Idling Current Alignment 2 Conne
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