SERVICE MANUAL - AMPLIMOS one stage amplifiers, amplificatori
Contents
1. UL CSA Model Only ave De Ze POWER Sor METER 2SA562 10D1 VD1212 id 1 ON 1 x 250735 10D2 A733 0 R Dep 62 64 2 OFF 2 xo GRAY WHITE TRea s202SC136 4 6 7 1524730 3 xo Ox 2A QRISISS8 os YT Lor 15 4 b 39v 1 8 BLUE 470 d y 191588 addi ES ECs 1 2473D eats E 3 SS RCH 2SA798 i Es Loe 54 220 MDV svo2 e d E Ji H i Y Fog 82K hee a AI is fj 5 EU Model Only BROWN j x na SI P AW RD13E BT Zo 8 SYMBOL RD27E SESPS S A Ceramic H 2 l Lus SE 9 Mylar BC l gi St Cu a Styral 1 T BP Bi Polar Electralytic 2SC1904 L 25 Low L ek Electralytic or S using Resistor IS Ze t 4 SS 5 or S 515 5 Won Inflannable Resistor Ji 5 B Metallized FilmResistor S5151 RESISTORS Are in ohms Watts 5 Tolerance BCE Unless Otherwise Noted K kn M MQ 4 Ya EXPORT Model Only MI CAPACITOR LT Donroe 192473 or 181588 Are in pF Unless Otherwise Noted P pF SS 5R TOLERANCE S5151R Jit 5 6 424 Fi dy of BIAS CURRENT 100mA ii SPEAKERS TIOW I10W 80 11 li E BOTH CHANNEL DRIVEN at 000Hz BIJEG UE 10 ACCESSORY PARTS LIST 9 PACKING LIST Parts No Stock No Description Stock No Description 1 9009300 Carton Cose 9202240 Operating Instraction 2 9027911 Stylofoom Packing 9237470 S2. Limiter Power stoge mpm 4 OPERATION OF NEW CIRCUIT 4 1 Current Mirror Circuit Purpose of use in BA 2000 By adding current mirror section to balanced type signal amplifier as Fig the current mirror circuit is effective to improve signal to noise ratio distortion factor and direct current stability 9 Advantages 1 By operation of differential amplification in this driv er stage the current mirror circuit is efficient to re duce the influence of the power line voltage devia tion and Common Mode Rejection Ratio C M R R Differential Gain CMRR Common Mode Gain 2 By basic functions of push pull amplifier in this cir cuit lower distortion factor is obtained 3 Since the output impedance of this circuit can be kept extremely high considerable high gain is ob tained 9 Operation This Current Mirror Circuit is composed of two transis tors TRO3 amp TROS as the current mirror section and a IC01 as the balanced typed signal amplifier as shown in Fig The transistor TRO3 and transistor A of first stage built in the IC operate as a push pull amplifier 9 Phase Characteristics When input signal shown in Fig is supplied to the base of the transistor A in the IC 1 Out of phase signal against the input signal appears at the collector of transistor A 2 In phase output signal against the input one appears at the emitter of transistor A 3 Since the base of transistor B
3. 540 D TRos x4 ii Ov S A ee OC Do zl 3 1924730 2SA733 2SA726 OM SUP ii 8 OS Aso or S1588 SL SG gt las b SE m 2SA917 1 2 7m te a 3 e TIET LL Hx Se r r 251736 S B c S S TRos 04 05 05 2SCI400 E U 2SC735 0 Y 02 A i a 0 i D s 2SABIB O Y or2SA896 1 2 ee D s une mae 8CI628 0 Y or 2SCI8BII I 1 2 2SA562 0 Y vee Ze 182473 Tf s 2SCI904 B V ce 4 1 RED NA 8 785 5 2SCI313 F G wh e leks E S S E 2 p 280356 2SB527 E I I sS E S lt Wei ch T 6 288537 E d i Ror Ka 280357 2 D Toy id Y e a rs K 280382 04 1 Sak RAIN VS KL gs EN Ss m n Jos Zo CY o Ld ist eese BOT Te D eS SS Jl ST _ TOT Let D 4 ge cel a g HW A L F 2630 mra 2SA850 0 E ror 25D356 D E or 280387 D E e AK h igo o lp Zoe They 2 CI7 35 D Ey 2SC1400 E U 7 de D a 2SA745A EH 26 d Se A Se Tre 3 gi BRN YZ e 2SA1403A T T T E ALais Hi e al ir re el IT tT UR of E 8 Co c Sit D vd D Tu f EBC amp Ro NES ne CH E 3 7 I 5 P XJ rmx 2SD382 M L Re 2SAT26 F G ox TR 2SB537 M L gen 2SCIT 35 D E x 3 x 205 RD ISE B x e SB d 1207 Sx Roo 627 amp me 28A850 0 E 833 n 2SB526 D E Ka or 2SB527 D E
4. built in the IC is grounded in AC equivalent circuit transistor B oper ates as the function of common base circuit there fore the signal at collector of transistor B is in phase signal against signal appeared at emitter of transis tor B 4 The signal appeared at collector of transistor B is given to the base of TRO3 The signal appeared at collector of TRO3 is out of phase to the signal at collector of transistor B and is in phase signal at collector of transistor A Thus the combination of transistor A and TRO3 is used as operation of push pull amplifier Open Loop Gain The open loop gain of conventional differential ampli fier itself is approximately 30dB to 35dB in normal ope ration furthermore by adding the current mirror circuit in series to coventional differential amplifier it is pos sible to obtain high open loop gain approximately 70db to 80dB Consquently the gain 40db to 50dB is able to add to negative feedback loop by using the current mirror circuit in order to improve distortion factors Constant Current Bios Current Adjust VR 5 ADJUSMENTS 5 1 Bias Current Adjustment See Fig 5 1 5 2 Condition 1 Room Temprature minimum counterclockwise 2 Output Load Speaker 8 ohms 5 Level Volume Maximum 3 A C Supply Voltage Rated Voltage 2 6 For this adjustment run this unit for more than 3 4 Turn down t
5. 360370 1 2SA798 F G IC TASC Rss 60 0103221 2202 SS 2A 2C j e Bu 0103221 2200 2A 28 C a 0311160 1524730 Doo Loan 151588 Pode TATE VRo1 02 1035290 470Q B Volume 1A 18 Dean 0340120 VD 212 Varistor 1A BC Sech p im yen e S S in Ass y Type Den ze 0311160 ae Diodo 2A 2C 2410920 3P Pin Ass y Type E 10311180 151588 6 2 F 2630 Power Supply Circuit Board for Driver Stage stock No 7502091 Conductor Side Parts List SANSUI F263 Parts No Stock No Description Position Parts No Stock No Description Position TR s 0300720 1 2SA850 C D TAB Dez 0311160 1524730 2c TR os 0306280 1 25C1735 C D 1A B 0311180 151588 Ta 0308450 1 280356 C D S Dss 0310340 1001 20 0308611 2 280357 D Dai mee 1824730 Diode 2c 0303280 1 258526 C D 0511100 5151696 TR amp Joana 3 258527 D E 18 Deis 0316530 RD27E 8 20 TRen 0306280 1 25C1735 C 0 18 EE Er JE 1p pas 0300720 1 25A850 C D 8 ZD 0316310 RD 13E 8 Zener Diode 18 Tan 0306290 2SC1400 E U 18 Ce 0549301 47 0p 1A TR t 0300470 1 25A726 F G 18 Co 0549301 or S SEC 12A TR 7 0300511 2 25A733 Q R 3c Con 0655103 posa GC 2A TReie 0306131 2 25C1364 6 7 2 3C Ce 0655472 4700 pF a 3B Ju mon 28C1364 6 7 Ze Ronc2 0104479 470 IW CR 2C 20 TR o 0306131 2 25C1364 6 7 2c Ros os 0203100 102 3W MR 3c Reos 606 0191471 100 TA 2A Dor o2 gu iu 1c B
6. 82473D 1524730 Dei 1 2473D Transistor 18 2A 24 2A 2A Stock No Description Position 0210102 10 0 YW MR 2A 1000330 100kQ B Volume 1A 1032410 2000 8 1131390 Push Switch 2410910 2P Pin Ass y Type E 6 5 F 2514 Meter Lamp Circuit Board stock No 7594531 Conductor SANSUI F 2514 Parts No Stock No Description PLoi cs 0420050 7V 0 3MA Lamp 6 6 F 2581 Final Stage Circuit Board ext No Side 7571491 Conductor Side Parts List 4 Side SANSUI 2581 PartsNo Stock No Description TRoi 0306451 2 2SC1403A O Y Frronssior TRo2 0306451 2 2SC1403A O Y Ru Os aaa CR Ra Ze leen 2030040 Tronsistor Socket 2030040 Transistor Socket Parts List Side Parts No Stock No Description prandio CERNIT A p NM TRoi 0300831 2 2SA745A O Y T ii TRo2 0300831 2 2SA745A O Y J Transistor PRol 0320130 Thermistor Rot 0103829 820 Roz 0103829 20 WW CR Ros 0135338 0 330 Roe 0135338 230 SW Sek 2030040 Transistor Socket 2030040 Transistor Socket 2410910 2P Pin Ass y Type E 6 7 F 2506 Input Terminal Circuit Board Stock No 7591511 Conductor Side Parts List Parts No Stock No Description 2430260 Jock 2430270 Jock ansui 7 OTHER PARTS 7 1 Top amp Bottom View Top View Power Transistor Bottom View T701 Description Parts No Stock No Power Cord Fuse Holde
7. SERVICE MANUAL POWER AMPLIFIER SANSUI BA 2000 Sansui SANSUI ELECTRIC CO LTD 1 SPECIFICATIONS POWER OUTPUT DAMPING FACTOR Min RMS both channels driven from 10 to 20 000Hz approximately 70 at 8 ohms load with no more than 0 03 total harmonic distortion CHANNEL SEPARATION at rated output 1kHz 110 watts perchannelinto8o0hms Min RMS both channels driven at 1 000Hz with no more better than 75dB than 0 03 total harmonic distortion in stereo operation HUM AND NOISE IHF better than 115dB 115 watts per channel into 8 ohms INPUT SENSITIVITY AND IMPEDANCE LOAD IMPEDANCE 8 ohms 1kHz for rated power output POWER BANDWIDTH 10 to 20 000Hz at or below 1 000mV 50kQ rated min RMS power GENERAL output and total harmonic POWER VOLTAGE 100 120 220 240V 50 60Hz distortion U S A amp Canada 120V Usable 110 130V 60Hz TOTAL HARMONIC DISTORTION POWER CONSUMPTION 910 watts max EE less than 00 3 at or below 480 watts 595VA rated rated min RMS power DIMENSIONS 460 mm 18 1 8 W output 160 mm 6 5 16 H INTERMODULATION DISTORTION 70Hz 7 000Hz less than 0 03 FREQUENCY RESPONSE at 1 watt improvements TABLE OF CONTENTS Secsion Title SPECIFICATIONS BLOCK DIAGRAM OPERATING DIAGRAM OPERATION OF NEW CIRCUIT 4 1 Current Mirror Circuit ADJUSTMENTS 5 1 Bias Cu
8. are not shown in each parts list of Complete circuit board please refer to the above parts list when ordering the connector Abbreviations CR Carbon Resistor Electrolytic Capacitor S R Solid Resistor Bi Polar Electrolytic Ce R Cement Resistor Capacitor M R Metallized Film C C Ceramic Capacitor Resistor Mi C Mica Capacitor F R Fusing Resistor O C Oil Capacitor NIR Non Inflammable P C Polystyrene Capacitor Resistor T C Tantalum Capacitor M C Mylar Capacitor Type F 2 6 pins 10 Sansui La pr sentation et les sp cifications sont susceptibles d ter modifi es sans pr avis par suites d am liorations ventuelles Anderungen die dem technischen Fortschritt dienen bleiben vorbehalten Design and specifications subject to change without notice for improvements 8 SCHEMATIC DIAGRAM F 2506 1 GREEN or 09 amp p gs Reo IK V2 17 7 1000mV 50k9 T S pp in Or S 13 03 S 1 So G3 100P FS 48 Q5 72K 73k oF TRog x4 Fg Quo A AN Ror 5K x x 5 T 18 Se eS ee S R318 Dos AE Con A c i N 1000MV 5Ok2 so S 1 Rg 27K 8 2 ae 3 a R S fig 2K H Svo dH E 2SA745A gt lor Cu SA 0 Y x2 Jar ZS 1 RY 3 7 si S G u
9. chematic Diogrom 3 9116051 Vinyl Cover INN PS SANSUI ELECTRIC CO LTD Sansui 14 1 Izumi 2 Chome Suginami ku TOKYO 168 JAPAN TELEPHONE 03 323 1111 TELEX 232 2076 SMO74 Printed in Japon N60620M
10. eat 622 0191100 ol UW Fa 18 D 0310350 1002 2A Res 0211471 4700 IW MR 2C 0 Dez 0310350 1002 2A Ress 0202151 1500 2W MR 2C Deoa 0310350 1002 Diode 2A Ree 0183471 4700 3W Cek 2c D 0310350 1002 2A Res 0211391 3900 IW MR 3c D s 0310340 10D1 3B Res 653 0137829 820 7W Cep 1D Dei 0310340 op 38 Ress 0103182 180 W CR D 0340120 ias ados 1A loco 4210290 filter Coil 20 Deos 0340120 VDI212 1A Bien 1150310 Relay 20 D s 0310490 SV 02 3c Elo 1150310 Relay 10 Dag AE 3c F oi 0s 0432240 AC Fuse 3A 8 Diode 0311160 1524730 Feos 0432290 A C Fuse 3A Den 2C 7 0311180 151588 2410590 4P Pin Ass y Tpey D 6 3 F 2629 Power Supply Circuit Board Stock No 7502081 Conductor Side Parts List Parts No Stock No EC ME hu EE pw fariseo Description Position Parts Nc Stock No Description Position 55 5 Cono 0602109 EI 2A 2C s5151 TA Cos 04 0602109 SS E 2A 2B 55 5 Coste 0605477 0 047pF 250V M C 1A 1C 55151 Ke ssp Diode Ro o2 0202332 d ZW GRE 1A 1C SR 1A Ros04 0202332 340 TA IC SS 5R Foi 04 0432500 AC Fuse 1 28 EDD i6 6 4 F 2631 Level Volume amp Meter Circuit Board stock No 7594521 Conductor Side Parts List Parts No Stock No TRoi 02 TRos 04 Doi 02 Dos 04 Dos 06 Dor o8 0306070 1 0306070 1 0311160 0311160 0311160 0311160 Description 25C1313 F G 2SC1313 F G 1824730 1
11. he volumes VRO1 VRO2 on F 2661 till minutes after turning on the power switch AUDIO OSCILLATOR OUTPUT STEP SUBJECS OUTPUT o AT TERMINAL ADJUST ADJUST FOR REMARKS 1 Distortion At 40kHz Set the Input Speaker VRO1 L CH Minimum point To avoid tem factors amp amplifier output to terminal of terminal 80 VRO02 R CH of Distortion prature rise Switching 15V on both Chan amplifier Osilloscope on F 2661 factors amp Switch complete the distortion nels by adjusting Distortion ing distortion adjustment in a adjustment O S C output level Meter short time VTVM 2 Bias Current VROT L CH Confirm Only being it confiramation VRO2 R CH bias current to over 100mA Set no input on F 2661 be within 100mA it to 100mA signal In case of not having a distortion metet ig 5 1 Blue Red milliammeter Blue Red mI Te a SH a DET Power Transformer 5 2 Power Meter Adjustments See Fig 5 Condition 1 Level Volume Maximum 2 For this adjustment run the unit for more than 2 After proceeding with Step 1 have a cooling off period 5 to 10 minutes to confrim the bias current r complete the adjustment by Step 2 to obtain bias current 100mA Front Panel minutes after turning on the power switch AUDIO OSCIIATOR OUTPUT OUTPUT CONNECTING TERMINAL ADJUST ADJUST FOR POINT At 1kHz Sine wave set the Input terminal of Speaker terminal VRO3 L CH Set the p
12. ointer of amplifier output to 29 7V on Amplifier 8Q VRO4 R CH power meter to both channels by adjusting VTVM on F 2631 OdB 110W on both O S C output level Oscilloscope channels Fig 5 3 VRO3 L CH VRo4 R CH al tel Front Panel 6 PARTS LISTS amp PARTS LOCATION 6 1 F 2661 Driver Circuit Board Stock No 7571501 Conductor Side Since some of capacitors and resistors are omitted from parts lists in this Service Manual refer to the common parts list for capacitors amp resistors which was appended previously to each Sansui Manual 28 Je TROY th ES E 05 ORANGE Parts List Parts No Stock No Description Position Parts No Stock No Description Position TRo1 02 0300680 1 2SA733 2 P Q TAB 1C Do7 08 1160 1524730 24 28 TRos c4 0306260 1 25C1628 O Y 1A 1C 160 4 SIS TRos os 0300700 1 25A818 O Y 1A 1C Dow 333 ED Diode 24 28 T 0306401 2 2SC1904 B V 2A 18 ten 1524730 TRov 10 0305640 1 2SC735 O Y Tronsistor 2A 12 Diniz lpsiiigo 181568 24 28 TRu 2 0300220 1 2SA562 O Y 2A 28 Dis 0340120 VDI212 Voristor 34 38 TRis 14 0306260 1 25C1628 O Y 34 38 4 Cum 0661250 25pF 50V C C 2A 1C TRis i amp 0300700 1 25A818 O Y 2C 2C Con obese 470p 80 EC 12856 TRu i amp 0308441 2 250382 M L 2A 2C A in de TRis 20 0303271 2 258537 M L 2A 2C RA Ed ed y Rem 0103560 S lyw cr 2A 2C ICo1 o2 0
13. r Power Fuse Description Parts List Parts No Stock No Czo1702 0559519 Co 0659801 R701 0203100 R702 0203100 Tz 4002520 E C 12000mF 63V C C 0 01 xF 150V MR 100 3W Power Transformer rai 0432290 2300060 2410091 2410830 5268601 3800240 pes Fuse 10A 100V 120V p Fuse 5A 220V 240V Power Fuse fuse Holder 6P AC Voltage Selector Plug 10P AC Voltage Selector Socket A C Voltage Adaptor Cover A C Power Cord 7 2 Front View 5 9 6 10 PartsNo Stock No Description Parts No Stock No Description 1 7007410 Ponel Ass y 6 VRoi o2 1000330 Level Volume 100k 8 4301040 Power Meter v 5318253 Knob Type B Level volume 5446230 MIminotion Plate 1131390 Push Switch Mam 2 Mif 702 5496030 Meter glass 75 5326531 Push Knob 5496040 Meter hode 5286721 Knob Guide Push Switch 3 5006620 Bonnet 6906480 Spring 4 LDzot 7726140 LED Ass y Power protector Indicator 8 5336581 SANSWI Mark f 170510 Lever Switch power 5517050 Leg 5 m 5326510 Knob Type E Power Switch 10 5058492 Bottom Plate 5286731 Lever Guide Power 7 3 Figures Connectors amp Pin Ass y Connectors Pin Ass y Type A 3 10 pins Type B 2 6 pins sed ve 7 ZPns 220480 3 Pins 2420460 es 3 Pa 2420650 uL d 4Pms 2420470 A Spins 2420480 i 6 Pins 2420490 1 Type A 3 10 pins Type B 3 10pins Type C 3 10 pins NOTE Since stock number of famale connectors type 8 with wires
14. rrent Adjustment 5 2 Power Meter Adjustment 6 PARTS LISTS amp PARTS LOCATION 6 1 F 2661 Driver Circuit Board Ponr D 6 2 F 2630 Power Supply Circuit Board for Driver Stage 6 3 F 2629 Power Supply Circuit Board 6 4 F 2631 Level Volume amp Meter Circuit Board 6 5 F 2514 Meter Lamp Circuit Board 6 6 F 2581 Final Stage Circuit Board 6 7 F 2506 Input Terminal Circuit Board 7 OTHER PARTS 7 1 Top amp Bottom View 7 2 Front View 7 3 Figures SCHEMATIC DIAGRAM ses PACKING LIST ACCESSORY PARTS LIST Soo 375 mm 14 13 16 D SMPTE method WEIGHT 18 3 kg 40 3 Ibs net 20 8 kg 45 0 Ibs packed 5Hz to 100kHz dB Design and specifications subject to change without notice for gt S lon 0004400 Ur REELL BACK COVER BACK COVER 2 BLOCK DIAGRAM Input Level Volume Input Level Volume AC Line Power Meter leter VR Output Inrush Absober Lon Power Meter Meter VR Output Regulated 57V Power Power Supply Circuit 57V Transformer 55V 3 OPERATING DIAGRAM 55V A n Power Tronsistor t 155v pa is z EE Be Out put Input NF Loop L CH L CH Current Mirror Power Transistor DAN Voltage Amplifier Current 57V
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