Pioneer SX-650 User's Manual
Contents
1. Tape deck L channel SPEAKER SYSTEMS L channel R channel ll e9 SPEAKER SYSTEMS 10 R channel 4 CIRCUIT DESCRIPTIONS 4 1 TUNER SECTION FH TUNER ANTENNA AM Tuner Composed of a single IC HA1138 and single element ceramic filter A 2 gang variable capacitor is employed with one stage providing tuning between the antenna and RF amplifier and the Antenna irae 5 STEREO IND Si a b gt FUNCTION SWITCH Ss asb DE EMPHASIS 5 MUTING Fig 1 Tuner section circuitry other stage tuning the local oscillator The RF amplifier itself is not tuned but feeds directly to the mixer followed by a 2 stage IF amplifier SIGNAL meter Fig 2 HA1138 block diagram FM Front End A linear 3 gang variable capacitor is used in a single stage FET RF amplifier The FET possesses high input impedance compared with a transistor and allows simple coupling with the input tuning circuit plus a significant advantage in terms of noise 11 The local oscillator is a variation of a Clapp circuit and its excellent temperature compensation pro vides frequency stability even where no AFC is used Local oscillator voltage is passed through a low value capacitor to the mixer transistor base FM IF Amplifier This section consists of two dual element ceramic ratio are also achieved by employing a transistor filters2. snp E 3548 Signal to Noise Ratio 50dB Image Response Ratio 40dB uus 9 4 gt 65dB Antenna eie Built in Ferrite Loopstick Antenna Miscellaneous Power Requirements 120V 60Hz Power Consumption 130W UL 310W max 240VA CSA DIMENSIONS voeem maa 480 W x140 H x371 D mm 18 7 8 W x5 7 8 H x14 5 8 D in Weight Without package 13 1kg 28 Ib 13 oz With 14 7kg 32 Ib 5 oz Furnished Parts FM T type Antenna 1 Operating Instructions 1 NOTE Specifications and design subject to possible modification without notice due to improvements 2 PANEL FACILITIES POWER INDICATOR LAMP SIGNAL METER ha Lights when SPEAKERS switch is moved to any other For FM and AM reception turn TUNING knob until position from POWER OFF and AC power is supplied to needle of the SIGNAL meter is deflected a maximum to the receiver the right SPEAKERS SWITCH Functions as both power switch and speaker selection switch POWER OFF AC power is off A Sound will be heard from speakers con aw nected to speaker terminals OFF No sound will be heard from speaker sys tems This position should be used when listening with headphones B Sound will be heard from speak
3. lt eg Terminal 029 Power amplifier assembly 1 GWH 101 Power supply assembly AWR 117 Power transformer ATT 315 MODEL ATT 303 MODEL KU Slide cover ANH 298 95 FRONT VIEW Meter AAW 040 Phone jack PHONES AKN 009 Rotary switch SPEAKER ASA 039 Variable resistor BASS ACV 159 Variable resistor TREBLE ACV 160 Lever switch HIGH FILTER FM MUTING ASK 090 650 Tuning shaft assembly AXA 124 Phone jack MIC AKN 011 Rotary switch FUNCTION ASD 049 Lever switch LOUDNESS MODE MONITOR 1 2 5 090 Variable resistor VOLUME ACV 179 Variable resistor BALANCE ACV 135 10 ADJUSTMENTS 10 1 SECTION 33 Through a 1kilo ohm resistor connect an AM signal generator to the AM antenna terminal Set for 400Hz at 35dB and 30 modulation Connect AC voltmeter to TAPE REC jack L or R Set FUNCTION switch to AM position Set AM SG and SX 650 dial indication to point 600kHz Adjust L4 for maximum indication on AC VM Set AM SG and SX 650 dial indication to point C 1 400kHz 10 12 Adjust TC4 for maximum indication on AC VM Again set AM SG and SX 650 dial indication tc point A Adjust bar antenna core for maximum indi cation on AC VM Return AM SG and SX 650 dial indication tc point C Adjust TC5 for maximum indication on VM Repeat
4. 650 AWG 049 7 AWG 049 No 8 AWG 049 No 6 32 AWX 095 No 1 31 095 3 29 095 2 30 AWX 095 No 4 STEREO IND 12 GWR 101 35 GWR 101 30 TUNING METER METER 4 54 Parts List of Tuner and AF Assembly AWE 075 A SEMICONDUCTORS SWITCHES Transistor 25 55 0 Rotary switch FUNCTION ASD 049 Transistor 2SC535 A Lever switch LOUDNESS ASK 090 Transistor 2SC461 B Lever switch MODE ASK 090 Transistor 2SC461 B Lever switch TAPE MONITOR ASK 090 IC HA1137 Lever switch ASK 090 IC HA1196 Transistor 2SC1344 D OTHERS Transistor 2SC1344 D IC HA1138 Transistor 2SC1344 D Phone jack PHONES AKN 011 Diode 1S2076 Diode 1S2076 Nut M9 B71 004 Diode 1S2076 Inside toothed washer ABE 001 Diode 1S2076 Terminal AKB 027 DIN connector socket AKP 011 Zener diode Zener diode Diode Diode WZ 192 MZ322 A 182076 182076 RESISTORS Variable BALANCE 250k ACV 135 Variable VOLUME 100k ACV 179 Semi fixed C92 048 Semi fixed C92 047 Semi fixed ACP 023 TRANSFORMERS AND COILS Carbon film RDX PS 105 Carbon film RD VS 101J Carbon film RD VS 123J Carbon film A 5 222 Carbon film RDAPS 151 FM antenna coil FM RF coil ATC 024 FM osci
5. SEMICONDUCTORS Carbon film RDXPS 473J Carbon film RDXPS 153J Transistor 2SC1649 N Carbon film RD PS 153J 2SC869 C Carbonnfilm 5 153 Transistor 2SC1649 N 25 869 Transistor 2SD313 D 2SD526 R Transistor 2SD313 D 2SD526 R Transistor 2SC945A O Transistor 2SB507 D 2SB596 R Carbon film 5 153J Carbon film RD PS 203 Carbon film 222 Carbon film RD PS 273 Carbon film 223J Carbon film RD PS 153J Carbon film 5 153J Carbon film RD PS 820 Carbon film RD PS 820 Carbon film RD PS 222 Transistor 2SC1647 P 2SC945A O Transistor 2SC1647 P 2SC945A O Transistor 25 823 25 733 0 Transistor 2SC1647 P 2SC945A O Transistor 2SC1384 0 2SC1166 Y Carbon film RD PS 392 Carbon film 5 154 Carbon film RD PS 153 Carbon film RD PS 153J Wire wound RT5B 151K Carbon film 330J Carbon film RD PS 332J Carbon film 102J Carbon film RD PS 154 Carbon film RD PS 153J Diode 152472 151554 Diode 152472 151554 Diode 1S2472 1S1554 Carbon film RD PS 822J Carbon film 102J Carbon film 102 Carbon film RD PS 683J Carbon film RD PS 470 Diode 1S2472 1S1554 Diode 1S2473 1S1555 Diode 1S2473 1S1555 Diode 1S2473 1S1555 CAPACITOR Zener EQA01 35R Electrolytic 0 22 10V CSSA R22M 10 Carbon film RD PS 332J Metal oxide RS1P 221J Carbon film RD PS 102 Diode 152473 E
6. 27 94 Bottom View 29 OG sau crea wa REOASEX DE ORIAU QEON 31 3 10 ADJUSTMENTS 10 1 AM SNO 33 10 2 5 es sasons V vanae IRE ER 34 10 3 MPX SOCION 4 35 11 EXPLODED VIEWS EROF Q Q arca wa RENS x 37 PME ferae Co otela 39 113 EHI in vetas vins bis 40 114 Tuner and AF AI 41 IND PatGPower Amp ciel OSO Wd xd dx 42 1185 PutbPower ain si uui es KS Eaux 9 ERU 43 ANDE EP 44 Part Rear PNE eser ic xum 45 12 SCHEMATIC DIAGRAMS P C BOARD PATTERNS AND PARTS LIST ___ ENG RE 46 122 Schematc Dianam ed ACL Yf Vimeo ete orina 49 12 3 Tuner and AF Assembly AWE 075 51 12 4 Equalizer Amplifier Assembly AWK 065 58 12 5 Tone Control Assembly AWG 049 60 12 6 Power Amplifier Assembly 1 GWH 101 63 12 7 Power Amplifier Assembly 2 GWR 101 6
7. Knob Tone Balance 099 Knob Function Volume Knob Lever Sw AAB 100 br AAD 113 nob Tunin AAA 036 9 Nut Washer B71 005 B22 017 650 f Parts indicated in green type cannot be supplied Wooden cabinet AMM 053 w Screw ABA 113 Part 7 See page 45 Screw ABA 002 cover crew l BA 002 du 012 J Foot a AEC 083 Screw pal Screw ABA 012 38 uu lt 8 lt a lt a N Parts indicated in green type cannot be supplied 190713V IM due mew 9x 14g LVXV Alquu sse yeys Bulunl Pd 1 1SC 23V aleld aleos 890 83 1942214 1eqqng 690 13 due 11 3 PART 2 DIAL FRAME Parts indicated in green type cannot supplied Ground terminal board 2 Pulley shaft 2 g 49 025 P 5 Pulley small AEC 101 Phone jack assembly AWX 106 S Rotary switch ASA 039 Side stay Variable_resistor Washer ABE 001 SN ACV 159 Nut B71 004 24 S Variable resistor ACV 160 Dial pointer 048 Nylon sheet AEC 191 Lever switch ASK 090 Tone control assembly AWG 049 Dial f ame 650 z 11 4 PART 3 TUNER AND AF ASSEMBLY Parts indicated in green type cann
8. 150 GND _ b kos 2 ad how W 6 15 n 1 10 9 0 1138 81 1234 5578 2 5 EP y i4 ce 3 gt 2 277 04 5 8 1S2076 3 RE PHONO ac EM O 2 5 72318 gt 0 04 E 7 1 OV Rn75SK Fy Cos 004 RA H RsslSK 5 Cor 004 Can E g 1000 3500P Rss 19 Ras 210 OUT TUNING MUT IN MUT METER 27 22 24 9 Bf 23 32 30 33 3123 5 ES ES 55 0 25 1344 2 523 x 3 ii LPF1 8 82242 2 Cas SHOP r ce fos 1137 0 1196 16 15 14 13 12 11 109 Rw 01 3594 2 22 5 33K 1 970 ST IND V C 0 9121 1 B 912 13V 30mA a ae Ipae REC MON REC MON 3 330P Rg68K 5 2 x 35 28 Q1 Rout ie Go SS 02 Lout 1 i 22K Rios 100 NOE R 2 I 330K 17 REC MON REC AWG 049 No 10 AWG 049 No 9 GWH 101 No 11 4 GWH 101 27 5 750 UNBALANCE RM 3000 BALANCE GND 377 36 o o 3 190 405 0 0r 2 322 8 8
9. However if the base bias voltage is raised the voltage swing at the collector is reduced and clipping occurs power supply voltage is limited by the IC voltage tolerance For this reason current from an external source is inserted at Q3 and Q6 collectors to become I1 and I2 The same currents are obtained as I3 and I4 from the emitters Q3 and Q6 therefore operate with adequate current and distortion at this stage is remarkably reduced A feedback amplifier amplifiers the demodulated signal to produce the IC output 4 2 PHONO EQUALIZER AMPLIFIER IC TA7136P1 is used with independent left and right channels Grade styrene capacitors 2 and grade J metal film resistors 5 comprise the equalizer elements yielding RIAA deviation that is within 0 3dB from 30Hz to 15kHz NOTE Fig 6 A shows the discrete component type while Fig 6 B shows the IC type Fig 6 A 30 18 Cs 1 6 R Re Cy Fig 6 B Fig 6 PHONO equalizer circuitry 13 4 3 MICROPHONE CIRCUIT A single transistor amplifier monophonic is provided in addition to the phono equalizer amplifier A selector switch cuts the AUX jack input when a plug is inserted into the MIC jack The amplified microphone signal is then supplied to both left and right channels The FUNCTION switch is set to the AUX position when using a microphone Fig 7 Microphone circuitry 4 4 CONTROL CR type tone controls are
10. Sio 510 T per ba FER FM 3000 GND 4 Pt f cd es Local Oscillator d 1 og os O 7 O4 5 1 04 VR BALANCE VRo a b VOLUME REC PLAY REC PLAY i MH O FA O MIC amp FUNCTION S4 ob MODE EQ amp 1 STEREO MONO amp 2 Ss a p LOUDNESS 3 PHONO OFF ON 4 AUX MIC 56 HIGH FILTER 5 TAPE MONITOR 1 OFF ON anpi OFF ON 1 SPEAKERS TAPE MONITOR 2 PONER OFF OFF ON 2 SP A TET 3 SP OFF 4 SP B 5 SP A B 0 2 ll PROTECTION CIRCUIT S9 a b DE EMPHASIS 1545 2545 vy J Le TONE CONTROL POWER AHP TONE CONTROL t CE N Sn a b RELAY OFF N DLAL ILLUMINATE PL4 POWER IND 650 6 LEVEL DIAGRAM E HOHH TONE SPE AKERS AUX ONTROL POWER AMP EQ AMP BALANCE MAIN AMP VOLUME VOLUME 48 60 50 40 30 2848 0 AUX 150mV 4 PHONO 2 5 OdBV 1V 35 5 dB 20 30 p FREQUENCY 1kHz 50 60 18 7 DISASSEMBLY COVER To remove take out 2 screws both left and right sides total of 4 screws BOTTOM PLATE To remove take out screws 1 11 eo 650
11. an IC 1187 and a transistor Ceramic and high density IC HA1137 The 1137 filters possess excellent selectivity which cannot be contains IF limiter amplifier FM detector meter obtained with L C type tuning filters The circuit drive and muting circuits composition uses this quality to provide out standing selectivity Excellent sensitivity and S N Di ny n Fig 3 HA1137 block diagram Multiplex Decoder Composed of three sections and employs an IC HA1196 with a block diagram as shown in Fig 4 signal 2 T Composite x v Sh ws dies Trigger circuit tx 172 19kH2 121 1 10 hi umm 87 dp 3 stereo 1 Rch Muting indicator output output signal 6 Fig 4 HA1196 block diagram 1 Switching Signal Generator A PLL phase locked loop system is employed 76kHz is generated by the voltage controlled oscillator an oscillator in which frequency is controlled by a voltage and converted into 38kHz by a frequency divider and then divided again to 19kHz This signal and the stereo pilot component 19kHz of the detected signal are applied to a phase comparator where the difference between them is converted into a voltage By feeding this voltage back to the VCO the oscillation signal is locked to
12. 010M 25 CEA 470P 10 CCDSL 101K 50 CKDYB 182K 50 CSZA 0R1M 35 CEA 101P 35 CKDYF 4032 50 4032 50 473 50 CCDSL 470 50 13 PACKING Vinyl 11 024 Operating instructions ARB 186 FM T type antenna Sheet cover AHG 034 AHA 112 Packing case AHD 383 MODEL AHD 382 MODEL KU OTHERS j Vinyl bag power cord cover AHG 023 Vinyl cover ferrite bar antenna AHG 040 cover 5 RECEIVER 5 650 Service Manual This leaflet provides the description of the parts applies only to the For detailed please refer to the Service Manual of SX 650 KCU QPIONEER 1 SPECIFICATIONS Power Requirements 120V 60Hz MODEL KC KU 220V and 240V Switchable MODEL HG 110V 120V 220V and 240V Switchable MODEL S Power Consumption UL 80W 185W max MODEL KC KU 185W MODEL HG 185W MODEL S 2 CONTRAST OF MISCELLANEOUS PARTS Primary voltage 220V 240V Primary voltage 110V 120V Plug in selector 2 positions Line voltage selector 4 positions with fuse holder ATT 315 KC ATT 303 KU Carbon film 2 2 225 84 5 Ceramic Ceramic Ceramic Ceramic 0 01 0 01 0 01 0 01 150V 250V 150V 250V Polystyrene 560P 50V OTHERS AC power cord AC socket OUTLET AC socket INLET Woodencabinet Rubber mat
13. 25 CSZA R47M 25 CSZA R47M 25 CKDYF 4032 50 CCDXL 120K 50 5 331 50 CKDYF 1032 50 CKDYF 4032 50 Ceramic Electrolytic Ceramic Ceramic Electrolytic Electrolytic Ceramic Electrolytic Ceramic Ceramic Mylar Ceramic Ceramic Electrolytic Ceramic Ceramic Ceramic Ceramic Ceramic Electrolytic Electrolytic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Electrolytic Electrolytic Polystyrene film Polystyrene film Polystyrene film Polystyrene film Electrolytic Electrolytic Ceramic Ceramic Electrolytic Electrolytic Ceramic Ceramic Mylar Mylar Electrolytic Electrolytic Ceramic Ceramic Electrolytic Electrolytic Ceramic Ceramic Mylar Ceramic CKDYF 1032 50 1032 50 100 16 CKDYF 4032 50 CKDYF 4032 50 CEA 470P 6 CEA 4R7P 35 CCDSL 221K 50 CEA 221P 16 CKDYF 1032 50 2232 50 563K 50 CKDYF 4032 50 4032 50 221 6 4032 50 4032 50 CKDYF 4032 50 CCDSL 680K 50 CCDSL 680K 50 CSZA 2R2M 25 CSZA 2R2M 25 CCDSL 470K 50 CCDSL 403K 50 CCDSL 150K 50 CCDSL 150K 50 CCDSL 150K 50 CCDSL 150K 50 CEA 101P 6 CEA 101P 6 5 1020 50 1026 50 3526 50 3526 50 52 282 25 CSZA 2 2 25 CCDSL 221K 50 CCDSL 221 50 221 25 221 25 331 50 CKDYB 331K 50 223K 50 223K 50 CSZA
14. 50 Ceramic 22p CCDSL 220K 50 Ceramic 18p CCDTH 180K 50 Ceramic 0 75p CGB R 75K 500 Ceramic 0 01 CKDYF 1032 50 Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Electrolytic Electrolytic Ceramic Ceramic Ceramic Ceramic Electrolytic Electrolytic Electrolytic Ceramic 0 047 Electrolytic 470 Electrolytic 1 Electrolytic 3 3 Polystyrene film 510p Eiectrolytic 0 22 Ceramic 82p Electrolytic 10 Electrolytic 10 Polystyrene film 510p Polystyrene film 510p Electrolytic 2 2 Electrolytic 2 2 Electrolytic 0 1 Electrolytic 0 1 Electrolytic 0 1 Electrolytic 0 1 Electrolytic 0 47 Electrolytic 0 47 Ceramic 0 04 Ceramic 12p Polystyrene film 330p Ceramic 0 01 Ceramic 0 04 see T ma CCDSH 180K 50 CCDCH 080F 50 CCDCH 330K 50 CCDCH 150K 50 CKDYB 103K 50 CGB R47K 500 CCDSL 080F 50 CCDSL 103K 50 CCDSL 101K 50 CKDYF 403Z 50 CKDYF 1032 50 CKDYF 4032 50 CKDYF 403Z 50 CKDBC 4732 50 CKDBC 4732 50 CKDBC 4732 50 CKDYB 331K 50 CEA 4R7P 35 CSZA 100M 16 CKDYF 4032 50 CKDYF 403Z 50 CKDYF 403Z 50 CKDYF 403Z 50 CEA 4R7P 35 CEA R47P 50 CSZA 100M 16 CKDBC 4732 50 CEA 471P 16 CSZA 010M 25 CSZA 3R3M 10 COSH 511 50 52 22 25 CCDSL 820K 50 100 16 100 16 COSA 511 50 5 511 50 CSZA 2R2M 25 CSZA 2R2M 25 CSZA OR1M 25 CSZA 0R1M 25 CSZA 0R1M 25 CSZA 0R1M
15. 8k 10k 10k film film film film film Carbon Carbon Carbon Carbon Carbon 470k 470k RDXPS RD 4PS Carbon Carbon film film ee CAPACITORS eee Electrolytic 0 47 35V CSZA R47M 35 Electrolytic 0 47 35V CSZA R47M 25 Ceramic 56p SOV CCDSL 560 50 Ceramic 56p 50V CCDSL 560K 50 Electrolytic 220 25V CEA 221P 25 Electrolytic 220 CEA 221P 25 Ceramic 10p 50V CCDSL 100F 50 Ceramic 10p 50V CCDSL 100F 50 Electrolytic 47 6v CEA 470P 6 Electrolytic 47 6V CEA 470P 6 Ceramic 330p CKDYB 331K 50 Ceramic 330p 50V CKDYB 331K 50 Electrolytic 4 7 25V CEANL 4R7P 25 Electrolytic 4 7 25V CEANL 4R7P 25 Mylar 0 012 50V COMA 123J 50 Mylar 0 012 COMA 123J 50 Polystyrene film 680p 50V 5 681 50 Polystyrene film 680 50V 5 681 50 Mylar 0 027 50V 273J 50 0 027 50V 273J50 Ceramic 8200p 50V CKDYA 822 50 Ceramic 8200p 50V CKDYA 822 50 Ceramic 2700p 50V CKDYA 272J 50 Ceramic 2700p CKDYA 272J 50 Parts List SEMICONDUCTORS Transistor 2SA798 F 2SA842 GR Transittor 2SA798 F 2SA842 GR Transistor 25 1438 25 1451 8 Transistor 2SC1438 V 2SC1451 B Diode Diode 1S2473 1S2473 T63 009 T63 009 AF choke coil AF choke coil Relay ASR 018 RESISTORS mes
16. 9 1 FRONT PANEL VIEW Wooden cabinet 053 Front panel assembly ANB 444 Knob SPEAKERS AAB 100 Knob BASS AAB 099 Knob TREBLE AAB 099 Knob HIGH FILTER AAD 113 Knob FM MUTING AAD 113 9 PARTS LOCATIONS 9 1 FRONT PANEL VIEW Wooden cabinet 053 Front panel assembly ANB 444 Knob SPEAKERS AAB 100 Knob BASS AAB 099 Knob TREBLE AAB 099 Knob HIGH FILTER AAD 113 Knob FM MUTING AAD 113 j 9 2 REAR PANEL VIEW Ferrite Bar antenna AXB 004 Terminal ANTENNA j AKA 002 Terminal GND AKE 017 Terminal INPUT AKB 027 Terminal TAPE 1 AKB 027 Terminal TAPE 2 AKB 027 25 socket OUTLET 004 AUTION SPEAMER IMPEDANCE 40 OR MORE SPEAKER A B 80 08 MORE SPEAKER ADG 005 Cover ANF 379 Terminal SPEAKER AKE 029 DIN connector socket 011 9 3 VIEW Power assembly 2 GWR 101 Power transformer ATT 315 MODEL KC ATT 303 MODEL KU 650 Electrolytic capacitor ACH 071 Tuning drum assembly AXA 070 Tuner and AF assembly AWE 075 Lamp assembly AEL 060 Dial scale plate AEC 251 28 94 a E o c lt 79 c o c 5
17. CKDYF 4032 50 63 __ w m A Y Power Amplifier Assembly 1 GWH 101 26 48V 50 O aw 9 1 Q 4 19 430 IN GWR 101 No P GWR 101 No F RELAY QU GWR 101 No E GWR 101 No G AWG 049 No 3 AWE 075 No 4 GWR 101 No H Switch 0 106 3 650 GWR 101 GWR 101 GWR 101 No C AWR 117 No 5 AWR 117 6 AWR 117 No 3 AWR 117 No 12 GWR 101 No A AWE 075 No 5 AWE 049 No 5 GWR 101 No N GWR 101 No K AWR 117 No 13 AWR 117 No 14 Sib F Switch 1 AWX 106 No 1 GWR 101 No D 66 127 POWER AMPLIFIER ASSEMBLY 2 GWR 101 GWH 101 No 8 GWH 101 No 6 GWH 101 No 19 GWH 101 No 17 GWH 101 12 AWR 117 No 10 211 GWR 101 31 DIAL ILLUMINATE POWER IND a GWH 101 4 GWH 101 2 GWH 101 No 23 GWH 101 20 GWH 101 13 GWH 101 No 26 101 No 18 GWH 101 No 28 5 AWE 075 No 12 AWE 075 No 20 STEREO IND NX 106 No 2 650 1524122 19 100 35 Rss a w c io 2 254823 2501384 Da 0 a 15247252 Parts List of Power Amplifier Assembly 2 GWR 101 symbol Deseription
18. Carbon film 470 RD PS 471 Metal oxide film 430 1W RS1P 431J Carbon film 560k RDXPS 564J Carbon film 560k RDXPS 564 Carbon film 2 2k RD PS 222 RDXPS 222 Carbon film 2 2k Carbon film 56k RDXPS 563 Carbon film 56k RDXPS 563 Carbon film 56k RDXPS 563J Carbon film 56k RDXPS 563 RD PS 202J RD PS 202 RD VS 122 RD7PS 122 RD VS 303 Carbon film 2k Carbon film 2k Carbon film 1 2k Carbont film 1 2k Carbon film 30k Carbon film RD PS 303J Carbon film 1 8k RD PS 182 Carbon film 1 8k RD 4PS 182 RD PSF 101 RD PSF 101 Carbon film 100 Carbon film 126 POWER AMPLIFIER ASSEMBLY 1 GWH 101 Carbon fi Im Carbon Carbon Carbon Carbon Caroon CAPACITORS Electrolytic Electrolytic Ceramic Ceramic Ceramic Ceramic Electrolytic Electrolytic Electrolytic Electrolytic Ceramic Ceramic Electrolytic Electrolytic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic e ee am m 3 9k 5 650 RD PS 392 RDXPS 392J RDXPSF 100 RD 4PSF 100J RD PSF 100J 100J CSZA 010M 25 CSZA 010M 25 CCDSL 560K 50 CCDSL 560K 50 CCDSL 680K 50 CCDSL 680K 50 CEA 221P 6 CEA 221P 6 CEA 470P 35 CEA 470P 35 CCDSL 150K 50 CCDSL 150K 50 CEA 221P 6 CEA 221P 6 CCDSL 181K 500 CCDSL 181K 500 CCDSL 181K 500 CCDSL 181K 500 CKDYF 4032 50
19. PANEL all knobs and remove shaft nuts on R and FUNCTION switches Front panel en be removed after taking out screws 1 FUNCTION 21 8 DIAL CORD STRINGING 1 Remove the wooden cover and the front panel 2 Turn tuning drum fully clockwise as viewed from X direction in Fig 17 3 Tie on end of cord to stud on inner section of tuning drum more easily performed by loosen ing setscrew and temporarily removing tuning drum from shaft 4 Route cord through tuning drum cutout make a half turn around the drum then route in sequence to pulley A dial pointer pulley B pulley C 5 Wind cord 3 turns clockwise as viewed from the rear around tuning shaft then route to pulley D 6 Wind cord two turns around tuning drum and tie to spring hook so that tension is applied to the cord 7 Tum TUNING knob and confirm normal cord motion then trim off excess cord 8 With tuning capacitorblades fully closed move dial needle to starting point left edge of scale 9 Apply laquor to tied ends of cord DIAL POINTER INSTALLATION CAUTION Metal portion of dial pointer is plated If this section is touched directly with the hand and collects fingerprints or other impurities it is difficult to remove them from aventurine finish As this is not desirable in terms of both appearance and anticorrosion take extreme care not to touch the metal section when handling the dial pointer Fig 17 9 PARTS LOCATIONS
20. QUT TUNING S IN MUT METER 7 22 24 3 811123 32 30 33 28 O 14 O E 31 H QM 750 e 9 2SC1344 gt lt 1 5 2 10 6 gt LPF1 8 829 ac Rx Ras 47K 235 33K AN 7 i 047 35 aca me uia E ssv ex aaa oss 1137 E 1 0 1196 5 14 13 12 1110 9 16 15 14 13 12 109 004 GN 417 1004 Cz L im Raz V C 0 TP 8 P gt 7 gt O15 SRS O12 13V 90 REC MON O O 100K VOLUME CONTROL 22K Rios 100 ale 330K AWG 049 10 AWG 049 No S 37 36 GWH 101 11 4 n 5 i GWH 101 274 5 Or 119 o p Age Mor 12210 dein 24 750 UNBALANCE RM 3002 BALANCE 650 4 AWG 049 1 AWG 049 2 AWG 049 No 7 AWG 049 No 8 AWG 049 No 6 32 095 1 31 AWX 095 No 3 29 AWX 095 No 2 30 AWX 095 No 4 1 STEREO IND 1 GWR 101 No 35 N 5 JE x lt Fo aU MEME LT Hm s 5 3 S We TUNING METER SIGNAL METER Ax 78 Parts List of Tuner
21. RT Brazier head tapping screw Pan head tapping screw Binding head tapping screw Countersunk head tapping screw E type washer Flat washer Spring lock washer Nut ORM Truss head tapping screw Suid Oval countersunk head tapping Screw OCT Pan head machine screw Countersunk head machine screw Oval countersunk head machine screw TM Truss head machine screw Binding head machine screw Pan head screw with spring lock washer Pan head screw with spring lock washer and flat washer Pan head screw with flat washer EXAMPLE 3x8 length in mm diameter in mm d Symbol Washer faced nut Internal toothed lock washer Outernal toothed lock washer Slotted set screw Cone point Slotted set screw Flat point Ig AR a Hexagon socket headless set screw Oval countersunk head wood screw Countersunk head wood screw audes in mm 2 diameter in mm d Symbol 1 111 EXTERIOR 1 39 TF Part 5 See page 43 ACH 071 RT3 x6 T Part 6 See page 44 I Capacitoi Pulley large 153 PM3 x 6 Front panel assembly ANB 444 Washer B22 017 Nut B71 005 Knob Speaker 100
22. connected to an amplifier with extremely low output impedance and flat response IC TA7136 31dB gain Bass can be varied in the range of 8dB 7dB 100Hz and treble in the range of 5748 6dB 10kHz Tone controls consist of a newly developed BASS and TREBLE pair With the BASS control set at center position the low frequency control circuit becomes a fixed loss circuit without regard to frequency Signal flow to the high frequency control circuit will be absent when the TREBLE control is set to the center position and a flat frequency characteristic will be obtained NOTE Equivalent circuit shown upper figure is obtained with controls at center VR R Cs R Fig 8 Tone control circuitry zu TREBLE VR As shown in the Fig 9 as slider A reaches the ultra high resistance section center position of the resistor element the VR becomes electrically open and signal flow ceases 14 55 VR At center position see Fig 9 points and contact shorting terminals 1 2 and 4 Since terminals 3 and 4 are connected at the circuit board all terminals 1 2 3 and 4 become shorted Center position Slider Ultra high B resistance A Resistance A 123 1234 Fig 9 TREBLE and BASS VR 4 5 POWER AMPLIFIER This is a basic direct coupled pure complementary OCL amplifier Its operation is stabilized by the differential amplifier which is driven by a balanced p
23. discrete component type has the number AWE 075 A SIGNAL TUNER AF ASS y 075 2 3 0 25055 1286595 0 28C461 i m 0 gt SaA SPEAKERS SA MONITOL ge ON SA3 TAPE MONITO gee STEREO SAS LOUDNESS OFF 650 1 1 EMPHASIS SWITCH ASSy 17 Awx 09S on e 521501442 se IPS GWN een IRS HA Sr Rn 5 ri sm SAG MUTING LL SIGNAL VOLTAGE NECESSARY FOR QN OFF OBTAINING 42Wx2 8Q OUTPUT POWER IK He R2 SAT HIGH FILTER RESISTORS QEF ON IN OHM 1 44 5 TOLERANCE UNLESS lt mA DC CURRENT INPUT SIGNAL OTHERWISE NOTED SA8 RELAY V DC VOLTAGE INPUT SIGNAL MONO OFF ON CAPACITORS SAS DE EMPHASIS IN UNLESS OTHERWISE NOTED pF 75 5 7545 123 TUNER AND AF ASSEMBLY AWE 075 A NOTE IC type may also used in the equalizer amplifier in place of the Discrete components shown on this diagram S METER 250535 q 25 55 FM ANT 7 IN
24. film RD PS 332J Carbon film RD PS 332 Carbon film RD PS 272 Carbon film RD PS 222 Carbon film RDPS 154J Carbon film RD 4PS 274J Carbon film 183J Carbon film RD PS 473J Carbon film RD PS 473 Carbon film RD PS 304 Carbon film RD PS 304 Carbon film RDXPS 682 Carbon film RD PS 913 Carbon film RD PS 181J Carbon film RDPS 562 Carbon film RD PS 564J Carbon film RD PS 102J Carbon film RD PS 682 Carbon film 334J Carbon film RDX PS 334J Carbon film RDX PS 104J Carbon film RDXPS 104J Carbon film RD PS 222 Carbon film 3 222 Carbon film RD PS 222J Carbon film 222 Carbon film RD PS 222 Carbon film RDXPS 512 Carbon film RD PS 393J Carbon film D RDXPS 332 Carbon film RDX PS 681 Carbon film RD PS 102J Carbon film RDXPS 222 film RDX PS 394J Carbon film RD PS 394J Carbon film RD PS 104 Carbon film RDZPS 104J Carbon film 470J Carbon film RDXPS 222 Carbon film 222 Carbon film RD PS 104 Carbon film RDX PS 101 Carbon film RDPS 683 Carbon film RD PS 683J CAPACITORS se ms Variable capacitor ACK 012 Ceramic trimmer ACM 006 Carbon film RD4PS 104J Carbon film RD 4PS 222 Carbon film RDXPS 104 Carbon film RD PS 473J Carbon film RD PS 152J Carbon film RD PS 753 Carbon film RD PS 914J Carbon film RDXPS 561 Carbon film RD PS 122 Carbon film RD PS 104 Ceramic 15p CCDTH 150K
25. the point A potential divided by R1 and R3 Also point C potential is the point A potential divided by RE1 and RL load Point D is connected to Q1 base and point C to Q1 emitter through R2 and RE2 Power Fig 14 Basic overload circuitry 15 hen RL is extremely small the point C potential be considerably lower than point D This otential difference forward biases Q1 Q1 switches N and current flows in D3 b operates in the negative half cycle and Qa cut off The signal flows as indicated by the roken line arrows in the center of Fig 15 1 is biased by the potential difference between oint C and point E If RL is extremely small point C potential becomes considerably higher that of point E Q1 switches ON and current ows in D3 If large current flows in Qa and Qb 1 becomes ON by RE1 and RE2 voltage drop nd current flows in D3 1 prevents faulty peration due to external noise MID Point Potential Detector Circuit DC potential is produced at the junction point f the power amplifier the command is sent to relay drive circuit Fig 15 shows this operating rinciple Power amplifier ec Fig 15 Basic circuitry for mid point potential detector Tuner Tone amp Hic amp EQ amp Power L 5 650 Q3 and Q4 comprise a differential amplifier When the same input is applied to both input terminals Q3 and Q4 bases an output is absent H
26. w k il x 2 mI NO 39 4 Q310N 3SIMYJHLO SS31Nn 37 NI SS SH01IYdyJ NO 330 63 44735 845 Ox 09104 3SIMN3H10 gt SS3M 3101 ASI Mv WHO NI 336 NO Sd01SIS3J Wand LYS HOLINOL 440 NO NO v 9VS HOLINC UST yo Km id E oat eee 869125077
27. 01647 2 B 1 Ro GRY gu 75 Fu 1 110 nov z ru LSA YV d 5 5 4 2 4 5 0 D ASWTCrFO SWITCHED 150 oo du 2801647 4 SIGNAL VOLTAGE NECESSARY FOR OBTAINING 42Wx2 8Q OUTPUT POWER 1K He OC CURRENT AT NO INPUT SIGNAL OC VOLTAGE AT NO INPUT SIGNAL 4 2 DE EMPHASIS SWITCH ASSEMBLY AWX 100 Parts List Slide switch DE EMPHASIS Polystyrene capacitor 560p 50V Polystyrene 560p 50V Mylar capacitor 0 0011 50V Mylar capacitor 0 0011 50V ASH 017 5 561J 50 5 561J 50 112 50 112 50 AWE 075 32 AWE 075 No 31 AWE 075 No 29 AWE 075 No 30 650 4 3 PANEL Parts indicated in green type cannot supplied r Power cord ADG 002 lt o 5 1 a w Line voltage selector AKR 033 94 PIONEER ELECTRONIC CORPORATION 4 1 Meguro Chome Meguro ku Tokyo 153 Japan U S PIONEER ELECTRONICS CORPORATION 75 Oxford Drive Moonachie New Jersey 07074 USA PIONEER ELECTRONIC EUROPE N V Luithagen Haven9 2030 Antwerp Belgium PIONEER ELECTRONICS AUSTRALIA PTY LTD 178 184 Boundary Road Braeside Victoria 3195 Australia lt 76HO4F51U gt AUG 1976 x 1 Printed in Japan lt ART 193 0 g
28. 0Hz 3dB 10kHz Hum and Noise IHF short circuited A Network rated power HON wayaqa sea sere exe 70dB sis emm sew eters as 90dB Section Jsable Sensitivity MONO 5 10 74 1 9pV STEREO 19 0dBf 4 9uV 5048 Quieting Sensitivity os s lt 15 0dBf 3 1V STEREO 38 0dBf 44 Signal to Noise Ratio at 65481 MONO os 70dB STEREO 24 65dB Distortion at 65dBf 100Hz MONO 0 15 STEREO 55 0 3 0 15 STEREO 5 5 0 3 6kHz ve 0 496 STEREO 0 4 Frequency Response 30Hz to 15 000Hz 9 2 dB Capture Ratio eos va lt 1 0dB Alternate Channel Selectivity 60dB Spurious Response Ratio 75dB Image Response Ratio 65dB csi ss cassa 90dB AM Suppression Ratio 50dB Mi ting Threshold vio ne ette OA 14dBf 2 8uV Stereo Separati we necem one ene mem m 40dB 1kHz 30dB 30Hz 15kHz Subcarrier Product Ratio 62dB SCA Rejection Ratio 2 62dB Antenna Input 5 24 wes 300 ohms balanced 75 ohms unbalanced AM Section Sensitivity IHF Ferriteantenna 300uV m IHF Ext antenna 15MV ADONIS
29. 100 58 9 180 330 NO NO 403 AHVSSa93N 39vi30 IWNDIS 24 uj 9VS WOLINO 1491955 xUF91282 869125270 ms 1 I 0 0 0 AM FM STEREO RECEIVER SIGNAL METER TUNING METER FM 2 759 Cyn kc sid 00 alot IER BALANCE wd 6Y SN 22 MUT 04 05 01182078 x3 2 L 111 RW i 518 28 4 WM H Css 709 25 4 CONTROL Ass y AWG 043 L PHONO f Ts 5 6 ait UE 1 0012 at 24 281 1 e x Y x 2 Q O M O R Es ey SOKA L ir 26 REC 2 REC 1 REC 2 T OFF 5 TAPE f OFF LET A cR AC VOLTAGE SELECTOR MODE 220V STER 541 FUNCTION LOUDNE OFEE 1 2 3 4 AUX MIC SHINS r O O Y W3xv3dS i PR A Skis H Wy 2 13 NIOIcI YN9IS ON 9 20 TWNDIS 10 ON 19 1N HJ0O 20 7H WD H3NOd 108100 758 5 29 SNINIV190 903 AHVSS393N 39VI10A WNSIS 1991262 7
30. 50V CCDSL 820K 50 Electrolytic 220 25V CEA 221P 25 Electrolytic 10 16V CEA 100P 16 Electrolytic 220 25V CEA 221P 25 588848 9888 888858 Electrolytic 10 16V CEA 100P 16 Ceramic 330p CKDYB 331K 50 Polystyrene film 510p COSA 511 50 Ceramic 330p 50V CKDYB 331K 50 1 Polystyrene film 510p 50V COSA 511J 50 Mylar 0 022 50V 223K 50 Electrolytic 2 2 25V CSZA 2R2M 25 Mylar 0 022 50V COMA 223K 50 1 Electrolytic 2 2 25V CSZA 2R2M 25 Electrolytic 1 25V CSZA 010M 25 Electrolytic 0 1 25 CSZA 1 25 Electrolytic 47 CEA 470P 10 Electrolytic 0 1 CSZA OR1M 25 Ceramic 100p 50V CCDSL 101K 50 Electrolytic 0 1 25V CSZA OR1M 25 Ceramic 1800p 50V CKDYB 182K 50 Electrolytic 0 1 25V CSZA 1 25 Electrolytic 0 1 35V CSZA OR1M 35 CSZA R47M 25 Electrolytic 100 35V CEA 101P 35 CSZA R47M 25 Electrolytic 0 47 25V Electrolytic 0 47 25V CKDYF 403Z 50 CKDYF 403Z 50 COMA 473K 50 Ceramic Ceramic 0 04 50V Mylar Ceramic 0 04 Ceramic 12p 50V Polystyrene film 330p 50V Ceramic 0 01 50V Ceramic 0 04 CKDYF 403Z 50 CCDXL 120K 50 COSA 331J 50 CKDYF 103Z 50 CKDYF 403Z 50 57 124 EOUALIZER AMPLIFIER ASSEMBLY AWK 065 Phono 5 input 58 SA1 1F arts List ONDUCTORS Transistor 25 725 6 25 640 Transistor 2SA725 G 2SA640 E Transistor 2S
31. 7 12 8 Headphone Assembly AWX 106 _ 71 12 9 De emphasis Switch Assembly AWX 095 72 12 10 Power Supply Assembly 117 73 12 11 Tuner and AF Assembly AWE 075 A 75 13 PACKING a 65450445 a 82 ADDITIONAL SERVICE MANUAL 1 O 84 2 CONTRAST OF MISCELLANEOUS PARTS 84 3 MODEL 650 Mn Ml HT OO 86 Diagrami vy stewea ex edi 87 3 3 Power Supply Assembly AWR 118 89 4 MODEL 650 83 Schomatie DIM sassis an esas Cr CREER Vi Eu DE EE Ch CR EN ES 91 4 2 De emphasis Switch Assembly AWX 100 93 18122 Aerei hA 94 1 SPECIFICATIONS Semiconductors au de 226 vus SEN o D 7 CWBnSISEOKS suem ims 29 Didd sea 29 Amplifier Section Continuous Power Output from 20 Hertz to 20 000 Hertz Both channels driven 35 watts per channel 8 ohms 35 watts per channel 4 ohms Continuous Rated Power Output No more than 0 3 18 watts per channel power output S ohms J o ves s No more than 0 0596 1 watt per channel pow
32. 7k 2W RS2P 472K Metal oxide film 4 7k 2W RS2P 472K CAPACITORS lm mw C1 Ceramic 0 01 150V Ceramic 0 01 150V Ceramic 0 01 150V Ceramic 0 01 150V Ceramic SEMICONDUCTORS Diode 151886 51801 02 151886 51801 02 151886 51801 02 151886 51801 02 SR3AM 4 SR3AM4 SR3AM 4 SR3AM 4 Ceramic Caramic 0 01 150V Ceramic OTHERS Fuse clip Fuse clip AKR 013 AKR 030 B Des De 4 sx 650 1 GWR 101 31 DIAL ILLUMINATE IND AWX 106 No 2 GWR 101 No 32 GWR 101 No 33 GWH 101 No 23 GWH 101 No 5 8 11 GWH 101 No 26 GWH 101 No 3 GWH 101 No 7 Yr GWH 101 No 1 12 11 TUNER AND AF ASSEMBLY AWE 075 NOTE Discrete components may also be used in the equalizer amplifier in place of the IC shown on this diagram S METER C40 15P 9 2SKSS cheat Fel 8 The um Bav aslo 6 15 4 3 9 0 1138 12345678 AM IN 169 100K 369 52 4 19V 49 lan S r 4 22 25 H 2 E g 7 2 3 1 AUX Rm Cm 006 1 5K 72 25 Ras 3835007 nan 1000P C 1000P 3500P 9 25 1344 EF er
33. C1313 G Transistor 2SA726 G 2SA640 E RD VS 154J NL RD VS 622 RD VS 622 RD VS 333 RD VS 133J RD VS 472 CAPACITORS Ceramic 47p 50 CCDSL 470 50 Ceramic 10 50V CCDSL 100K 50 Electrolytic 100 101 10 650 59 a 125 CONTROL ASSEMBLY AWG 049 4002 T 5 O MOLY 24 100 42514 5 40012 tt yc O 015 d9ELLYL 6 0019 04070017 3 j N1 421 spol 8 1 1 Ale 0 Parts List of Tone Control Assembly AWG 049 SEMICONDUCTORS ____ IC TA7136P IC TA7136P OTHER Lever switch HIGH FILTER Lever switch FM MUTING Nut 9 Inside toothed washer RESISTORS 50k 50k ACV 159 ACV 160 Variable BASS Variable TREBLE 5 5 RD PS RD PS 5 5114 5114 101 1014 Carbon Carbon Carbon Carbon 510 510 100 100 240k film film film film film xW 240k 47k 47k 100k 100k RDX4PS RD PS RD 1PS RD PS RD PS Carbon Carbon Carbon Carbon Carbon film film film film film 2 7k 2 7k 47k 47k 2 7k 5 RDX4PS RDXPS RD PS RD PS film film film film film Carbon Carbon Carbon Carbon Carbon RD PS RDXPS RDXPS RDXPS RD7PS 2 7k 6 8k 6
34. Capacitor cover Terminal board 2P Operating instructions ACG 003 KC ACG 001 KU 054 075 279 294 KU 038 053 077 2 positions 25us 75us 3 positions 25us 50us 75us English German French 85 3 MODEL 650 Parts indicated green cannot supplied 3 1 REAR PANEL Terminal FM Antenna AKA 007 Line voltage selector AKX 037 3 2 SCHEMATIC DIAGRAM TUNING METER Ve SPEAKERS SA MONIT POWER OFF 2 5 3 SP or SA3 MONIT 1 4 SP B OFF 0 5 SP A B AC VOLTAGE SELECTOR SA4 HODE SA5 LOUONESS 2 FM OFF o 3 ONO 4 AUX MIC 650 POWER SUPPLY ASS y AWR 118 pope 181886 u 0 0 1501344 Runn Rs um mc YU 24 2861647 SAG FM MUTING SIGNAL VOLTAGE NECESSARY FOR ON OFF OBTAINING 42Wx2 B OUTPUT POWER 1K He SAT HIGH FILTER RESISTORS QFE ON IN OHM 1 48 25 TOLERANCE UNLESS OC CURRENT NO INPUT SIGNAL OTHERWISE NOTED K KQ M MQ SA8 RELAY DC VOLTAGE INPUT SIGNAL ON CAPACITORS IN F UNLESS OTHERWISE NOTED pF 88 SX 650 F ar 3 3 3 POWER SUPPLY ASSEMBLY AWR 118 GWR 101 No 31 DIAL ILLUMINATE POWER IND AWX 106 No 2 GW
35. DYF 403Z 50 Ceramic 0 047 50V CKDBC 473Z 50 Ceramic 0 04 50V CKDYF 403Z 50 Ceramic CKDBC 473Z 50 Electrolytic 220 6 221 6 021 Ceramic CKDBC 473Z 50 Ceramic 0 04 CKDYF 4032 50 022 Ceramic 330p 50V CKDYB 331K 50 Ceramic 0 04 50V CKDYF 4032 50 023 Electrolytic 4 7 35V CEA 4R7P 35 Ceramic 0 04 50V CKDYF 4032 50 C24 Electrolytic 10 16V CSZA 100M 16 Ceramic 68p 50V CCDSL 680K 50 C25 Ceramic 0 04 50V CKDYF 4032 50 Ceramic 68p 50V CCDSL 680K 50 1 Ceramic CKDYF 4032 50 Electrolytic 2 2 CSZA 2R2M 25 Ceramic 0 04 50V CKDYF 403Z 50 Electrolytic 2 2 25V CSZA 2R2M 25 Ceramic 0 04 50V CKDYF 4032 50 Electrolytic 100 6V CEA 101P 6 Electrolytic 4 7 35V CEA 4R7P 35 Electrolytic 100 6 101 6 Electrolytic 0 47 50V CEA R47P 50 Polystyrene film 1000p 102G 50 Electrolytic 10 CSZA 100M 16 Polystyrene film 1000p 50V 1020 50 Ceramic 0 047 50V CKDBC 4732 50 Polystyrene film 3500 50 5 352G 50 Electrolytic 470 16V CEA 471P 16 Polystyrnee film 3500p 50V COSA 352G 50 Electrolytic 1 25V CSZA 010M 25 Electrolytic 2 2 25V CSZA 2R2M 25 Electrolytic 3 3 10V CSZA 3R3M 10 Electrolytic 2 2 CSZA 2R2M 25 Polystyrene film 510p CQSH 511J 50 Ceramic 220p 50V CCDSL 221K 50 Electrolytic 0 22 25V CSZA R22M 25 Ceramic 220p 50V CCDSL 221K 50 Ceramic 82p
36. Fr 4 bem 4 A 2 ij 650 MODEL SX 650 COMES IN FOUR VERSIONS DISTINGUISHED AS FOLLOWS 120V CSA Canada approved 120 UL U S A approved 220V and 240V Switchable SEMKO Sweden NEMKO Norway DEMKO Denmark and El Finland approved 110V 120V 220V and 240V Switchable General export model This Service Manual is applicable the model SX 650 KCU CONTENTS 1 SPECIFICATIONS xcv Ec PC YR 5 2 FRONT PANEL FACILITIES is cu sta NGR SD 7 8 3 CONNECTION DIAGRAM quis ocu 9 4 CIRCUIT DESCRIPTIONS TunerSectl On STD at dana 11 42 Phono Equalizer Ampli 1 SARO ETS XS ES voe dus 13 Microphone Sr 14 44 Tone Control ad visae wa 14 i OA an 14 15 84 POMC I TYF O IO I VOR ana 16 5 WE 17 6 LEVEL DIAGRAM 19 7 DISASSEMBLY wa aul bata sa ea aaa ana DENSE awia RR 20 8 DIAL CORD STRINGING aa SS 22 9 PARTS LOCATIONS ER 23 VB 25 93 TOD VIBW asu Ier S SIS
37. KER AKE 029 12 SCHEMATIC DIAGRAMS BOARD PATTERNS AND PARTS LISTS 12 1 MISCELLANEOUS PARTS LIST COILS AND TRANSFORMERS 38 315 303 KU 22 025 Power transformer Ferrite balun Ferrite bar antenna AXB 004 RF choke coil Lamp assembly Lamp assembly Lamp assembly Lamp with leads 8V 50 Lamp with leads 8V 50mA AEK 101 Circuit Diagrams of ICs HA1138 AM IC NOTE e Capacitors in uF unless otherwise noted e Resistors 9 AW unless otherwise noted k k2 SEMICONDUCTORS Description Transistor SP 40W Transistor SP 40W CAPACITORS see Electrolytic 8000 50V ACH 071 071 003 ACG 003 KC ACG 001 KU Electrolytic 8000 50V Ceramic 0 01 Ceramic 0 01 RESISTOR mew Carbon film 2 2M YW RD4PS 225J SWITCH Selector switch POWER ASA 039 7136 1 External Appearance of Transistors and 1 5 2SK55 2SA798 Bi 250313 8 258507 Be B 2SC535 B 28 1384 25 461 NS 25 1438 E 25 1647 ET 25 823 25 1649 2SC945A HA1137 HA1138 HA1196 TA7136P 1234567 Index 48 1 2 3 122 SCHEMATIC DIAGRAM NOTE The IC of equalizer is identified and AF Assembly AWE 075 while the
38. LAY 2 For monitoring of playback or record mode of tape deck connected to TAPE 2 terminals REC or PLAY NOTE When not monitoring record or play back mode of a tape deck both switches should be in OFF upper position If either 1 or 2 switch is in ON lower position the program source selected by the FUNCTION switch will not be heard through speaker system or headphones MODE SWITCH For selection of stereophonic monophonic mode of playback In normal operation switch should be in STEREO position In the MONO position R and L channel signals will be mixed and sounds coming from speakers of both channels will be the same NOTE Recording stereophonically with the MODE switch in the MONO position may cause channel separation to deteriorate 3 CONNECTION DIAGRAM REAR VIEW Outdoor FM antenna T type FM antenna AM antenna indoor or outdoor Wire mesh 75 ohm coaxial 300 ohm feeder cable Please see following section Antenna and Ground Connections for instructions regarding FM antenna connection SX 650 AM ferrite antenna CAUTION IMPEDANCE A ON MORI PLAKLAR A 80 ON MORE SPEAKERS AC OUTLETS i 5 Max FM OE B 25 5 3 204 Nas 2 00 9000 5 4 should be set 75uS unit is set to this when leaving fact
39. R 101 No 32 GWH 101 No 23 GWR 101 No 3 GWR 101 No 7 07 SR3AM 4 GWR 101 No 1 GWR 101 No 5 001x8 Ds Dy SR3AM 4 gt 4 Parts List SEMICONDUCTORS CAPACITORS we sm D1 181886 C1 Ceramic ACG 004 0 S1801 02 C2 Ceramic ACG 004 0 151886 G3 Ceramic ACG 004 0 51801 02 C4 Ceramic ACG 004 0 181886 C5 Ceramic ACG 004 0 51801 02 151886 C6 Ceramic ACG 004 0 C7 Ceramic 1 004 0 c8 Ceramic ACG 004 0 S1B01 02 SR3AM 4 SR3AM 4 SR3AM 4 SR3AM 4 RESISTORS Metal oxide 4 7k 2W RS2P 472K Metal oxide 4 7k 2W RS2P 472 OTHERS 4 MODEL 650 4 1 SCHEMATIC DIAGRAM TUNER 8 AF ASS y AWE 015 0 25055 i vo T ne ye Rys d L e sie Em SWITCHES Si SPEAKERS 2 SPA 5 DE EMPHASIS SWITCH ASS y AWX 100 Q CE MEME 0 4 2501344 fu f SA FM MUTING QN OFF 2 SA HIGH FILTER OFF ON SA8 RELAY OFF DE EMPHASIS 1545 50 45 255 POWER AMP Ass y AWH POWER SUPPLY AWR 117 J OBA ONO Tsise RESISTORS IN OHM 1 4W 25 TOLERANCE UNLESS OTHERWISE NOTED K MQ CAPACITORS IN UNLESS OTHERWISE NOTED pF Qu n 25
40. aker or headphone output level the OFF lower position Level increases with clockwise rotation of the knob FM TUNING METER With the needle of the SIGNAL meter deflected to the right fine tune broadcast centering needle of the TUNING meter L LOUDNESS SWITCH For listening at low volume level placing this switch in the ON position will boost response in low and high frequency ranges The response of the human ear to low and high sound volumes is different At low volume levels the ear is relatively insensitive to sounds at either extreme of the frequency scale By means of the LOUDNESS switch these sounds are given additional amplification STEREO INDICATOR LAMP Lights when FM stereo broadcast is being received TUNING KNOB For selection of FM or AM stations FUNCTION SELECTOR For selection of program source AM AM broadcasts FM FM broadcasts PHONO Playing records AUX MIC For use of component connected at AUX terminals of receiver or microphone which may be plugged into MIC jack NOTE AUX and MIC program sources cannot be used simul taneously When using AUX hi fi component micro phone should be disconnected MIC JACK Accepts standard plug Microphone input signal enters both R and L channels TAPE MONITOR SWITCHES 1 For monitoring of playback or record mode of tape deck connected to TAPE 1 terminals P
41. and AF Assembly AWE 075 SEMICONDUCTORS Symbol Description 25 55 0 2SC535 A Transistor Transistor Transistor 2SC461 B Transistor 2SC461 B IC HA1137 IC HA1196 Transistor 2SC1344 D Transistor 2SC1344 D IC HA1138 IC TA7136P1 IC TA7136P1 Transistor 2SC1344 D Diode 152076 Diode 152076 Diode 1S2076 Diode 152076 2 diode WZ 192 Zener diode MZ322 A Diode 182076 Diode 1S2076 TRANSFORMERS AND COILS FM antenna coil ATC 023 FM RF coil ATC 024 FM oscillator coil ATC 025 AM oscillator coil ATB 013 Micro inductor ATH 007 RF choke coil T24 028 RF choke coil T24 028 RF choke coil T24 028 RF choke coil 124 028 RF choke coil T24 028 ATE 008 T73 035 FM matching transformer FM IF transformer ATF 013 ATF 013 ATF 027 FM ceramic filter FM ceramic filter AM ceramic filter ATF 033 Low pass filter 79 mee rmm SWITCHES me ms Rotary switch FUNCTION Lever switch LOUDNESS Lever switch MODE Lever switch TAPE MONITOR Lever switch TAPE MONITOR OTHERS lt Phone jack PHONES Nut M9 In side toothed washer Terminal DIN connector socket RESISTORS ll mw Variable BALANCE 250k Variable VOLUME 100k Semi fixed Semi fixed Semi fixed Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon f
42. er output 8ohms No more than 0 0596 Intermodulation Distortion 50Hertz 7 000Hertz 4 1 from AUX Continuous Rated Power Output No more than 0 3 18 watts per channel power output Bohms No more than 0 0596 1 watt per channel power output 8ohms No more than 0 0596 Dumping Factor 20 Hertz to 20 000 Hertz8 ohms 30 Input Sensitivity Impedance PHONG a Gun ws 2 2 5m V 50k ohm MIO uus arme sss MAUS STE s 7mV 50k ohms RUX Vs 150mV 50k ohms TAPEPLAY T es i 150mV 50k ohms 2 cae am entren 150mV 50k ohms PLAY 2 DIN connector 150mV 50k ohms PHONO Overload Level 0 1 200mV 1kHz Output Level Impedance 150mV TARE RECZ yu eg ywn 150mV TAPE REC 2 DIN connector 30mV 80k ohms SPEAKER wes Ya EE ics A B A B HEADPHONES ne ew Low Impedance Frequency Response PHONO RIAA equalization 30 Hertz to 15 000 Hertz 0 3dB AUX TAPEPLAY lt cy yes aai 10 Hertz to 50 000 Hertz 7 dB Tone Control BASS xe ei d 8dB 7dB 100Hz TREBLE cv 7dB 6dB 10kHz Filter HIGH pea 5 6kHz 6dB oct Loudness Contour Volume control set at 40dB position 5 sis ee 6dB 10
43. ers con A B Sound will be heard from speakers con nected to A terminals and from speakers to speaker terminals connected to B terminals PHONES PLUG Insert headphone plug into this jack when headphone 5 listening is desired In this case SPEAKERS switch should be in OFF position BASS TREBLE CONTROLS When turned clockwise from the OFF position response in bass or treble range respectively is boosted Turning counterclockwise attenuates response At the OFF posi tion the tone control circuit is bypassed and frequency response is flat HIGH FILTER SWITCH For high frequency noise due to scratches on the record place switch 6kHz position This will provide 648 octave attenuation at frequencies above 6kHz For normal BALANCE CONTROL operation switch should be in OFF upper position For adjustment of relative output levels of L and R channels of speaker systems or headphones Clockwise rotation from center position increases volume of R over FM MUTING SWITCH channel Counterclockwise ration increases volume of For selection of FM broadcasts the switch should be in L channel over R ON upper position When switch is in the ON position unpleasant interstation noise is suppressed When signal strength is poor it may not be possible to bring in the VOLUME CONTROL desired station if MUTING is ON In this case place it in For adjustment of spe
44. ilm Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film AKN 011 B71 004 ABE 001 AKB 027 AKP 011 ACV 135 ACV 179 C92 048 C92 047 ACP 023 RD PS 105 RD VS 101J RDAVS 123J RDVS 222 RD PS 151J RD VS 682 RD 4VS 102 RD 4VS 820 RD VS 332J 5 183J RD PS 101 RD PM 911 RD PS 102 RD PS 113 RDX4PS 121 RDAPS 471 RD PS 471J RD PS 153J RDXPS 473J RD PS 473J RD PS 751 RD PS 222 RD PS 562 RDXPS 564 RD PS 123 Carbon film RDXPS 104 Carbon film RD PS 222 Carbon film RDXPS 104J Carbon film RD PS 473 Carbon film RD PS 152 Carbon film RDPS 222J Carbon film 103J Carbon film RD PS 104 Carbon film RD PS 100J Carbon film RD PS 303 Carbon film 303J Carbon film RDXPS 682 Carbon film 5 682 Carbon film RDXPS 473 Carbon film RD PS 473J Carbon film 753 Carbon film 914J Carbon film RD PS 561J Carbon film RD PS 151 film 153 Carbon film RD PS 332 Carbon film 332J Carbon film RD PS 222J Carbon film RDAPS 562 Metal film RN PT 1602F Carbon film RD PS 153J Carbon film RD PS 102 Carbon film RD PS 102 Carbon film RD PS 122 Carbon film RD PS 104J Carbon film RD74PS 102 Carbon film RDPS 104J Carbon film RDXPS 151 Carbon
45. ilm 2 2k RD PS 2 RD PS RD XPS RD PS RD PS 914 RD PS 561 RD PS 151 RD PS RD7PS RD PS 102J RD PS 102J RD PS 122J RD PS RD PS RD PS 222 RD PS 154 RD PS 274 RDXPS RD PS RD PS 181 RD PS 562 RDXPS 564 5 RDXPS 222 RD PS 2225 RD PS 222 RD PS RD PS RD PS 394J RD PS 394J RD PS 104J RD PS RD PS RD PS ACK 012 ACM 006 CCDTH 150K 50 CCDSL 220K 50 CCDTH 180K 50 CGB R75K 500 CKDYF 1032 50 650 Description Part No Ceramic CCDSH 180K 50 Ceramic 0 01 50V CKDYF 103Z 50 Ceramic 8p 50V CCDCH 080F 50 Ceramic 0 01 50V CKDYF 103Z 50 Ceramic 33p 50V CCDCH 330K 50 Electrolytic 10 16V CEA 100P 16 Ceramic 15p 50V CCDCH 150K 50 Ceramic 0 04 50V CKDYF 4032 50 Ceramic CKDYB 103K 50 Ceramic 0 04 CKDYF 4032 50 Ceramic CGB R47K 500 Electrolytic 47 CEA 470P 6 Ceramic 8p 50V CCDSL 080F 50 Electrolytic 4 7 35V CEA 4R7P 35 Ceramic 0 01 50V CKDYF 103Z 50 Ceramic 220p 50V CCDSL 221K 50 1 100 50V CCDSL 101K 50 Electrolytic 220 16V CEA 221P 16 D Ceramic CKDYF 4032 50 Ceramic 0 01 CKDYF 1032 50 Ceramic 0 022 CKDYF 2232 50 Ceramic CKDYF 1032 50 lser wees 0 04 50V CKDYF 4032 50 Mylar 0 056 50V COMA 563K 50 Ceramic 0 04 50V CKDYF 403Z 50 Ceramic 0 04 50V CK
46. ilm 300k RD PS 304J Carbon film 300k RD PS 304J Carbon film RDXPS Carbon film RD PS 682 Carbon film 330k RDXPS 334J Carbon film 330k RDXPS 334 Carbon film 100k RDXZPS 104 Carbon film RD PS Carbon film RD PS 512 Carbon film 39k RD PS 393J Carbon film 3 3k RD PS 332J Carbon film 680 RD PS 681J Carbon film RD PS Carbon film RD PS Carbon film 2 2k RD PS 222 Carbon film 2 2k RD PS 222 Carbon film 100k RD PS 104 Carbon film RDX4PS CAPACITORS sene Carbon film RD PS Carbon film 2 2k RD PS 222 Carbon film 100k RD PS 104J Carbon film 75k RDX PS 753 Variable capacitor Carbon film RDXPS Ceramic trimmer Ceramic Ceramic Ceramic Ceramic Ceramic Carbon film Carbon film 1 2k Carbon film 100k Carbon film RDAPS RD PS 122 RD PS 104 RD 4PS 56 film 10k RD PS 103 Carbon film 100k Carbon film 100k RDXPS 104J Carbon fi Carbon film 10 RDAPS 100 Carbon film 910k Carbon film 560 Carbon film 6 8k RD PS 682 Carbon film 150 Carbon film 6 8k RDX PS 682J Carbon fi Carbon film 47k RD PS 473 Carbon film 1k Carbon film 1k Carbon film 1 2k Carbon film 2 2k Carbon film 150k Carbon film 100k RD PS 104J Carbon film 270k Carbon film 150 RD PS 151 Carbon fi Carbon film 3 3k RD PS 332 ma mwn mw Carbon f
47. lator coil ATC 025 AM oscilator coil ATB 013 i 1 Micro inductor ATH 007 Carbon film RD VS 682J Carbon film 5 102 Carbon film RDXVS 820 Carbon film 5 332 Carbon film RDXAVS 183 RF choke coil T24 028 RF choke coil T24 028 RF choke coil T24 028 RF choke coil T24 028 choke coil T24 028 Carbon film RD PS 101 Carbon film RD PM 9114 Carbon film RD PS 102 Carbon film RDXPS 113 film RD PS 121 matching transformer ATE 008 FM IF transformer T73 035 FM ceramic filter ATF 013 FM ceramic filter ATF 013 AM ceramic filter ATF 027 Carbon film RDXPS 471 Carbon film RDAPS 471J Carbon film RDXPS 153 Carbon film 473 Carbon film RD PS 473J Low pass filter ATF 033 Carbon film RD PS 751 Carbon film RDX PS 222 Carbon film RD PS 562 Carbon film RD PS 564 Carbon film RDX PS 123J 55 Carbon film 2 2k RD PS 222 Carbon film RDXPS Carbon Carbon film RDXPS Carbon RD PS 473J film Carbon RD PS 332 RD PS 332J RD PS 222J RD PS 562J 1602F Carbon film Carbon film 3 3k Carbon film 2 2k Carbon film 5 6k Metal film Carbon Carbon Carbon film RD PS 102J Carbon Carbon film RD PS 332 Carbon film RD PS 473 Carbon film 47k RD PS 473 Carbon f
48. lectrolytic 0 22 10V CSSA R22M 10 151555 Electrolytic 220 16V CEA 221P 16 Diode 182472 Electrolytic 100 35V CEA 101P 35 181554 Electrolytic 100 35V CEA 101P 35 OTHERS Electrolytic CEA 331P 6 Electrolytic 330 6V CEA 331P 6 Electrolytic 220 16V CEA 221P 16 259 Electrolytic 100 35V CEA 101P 35 Insulator pipe ADX 016 Electrolytic CEA 101P 50 Ceramic 100p 50V CCDSL 101K 50 Rese lene Electrolytic 3 3 sov 50 Electrolytic 100 50V CEA 101P 50 RD PS 272 RD PS 272J RD PS 272 RDAPS 272 CEA 221P 16 CEA 221P 50 CEA 221P 50 Electrolytic Electrolytic 220 50V Electrolytic 128 HEADPHONE ASSEMBLY AWX 106 51 No 1 GWH 101 No 21 GWR 101 No 32 DIAL ILLUMINATE AWR 117 10 POWER IND GWR 101 No 31 GWR 101 No 33 GWH 101 No 16 Parts List Headphone jack Metal oxide film 150 2W RS2P 151J Metal oxide film 150 2W RS2P 151J Carbon film 27 RDPS 270 71 12 9 DE EMPHASIS SWITCH ASSEMBLY AWX 095 AWE 075 No 30 AWE 075 No 31 AWE 075 No 29 AWE 075 No 32 Parts List CAPACITORS Mylar 1100p 50V COMA 112J 50 Mylar 1100p 50V COMA 112J 50 Slide switch ASH 015 0 7 12 10 POWER SUPPLY ASSEMBLY AWR 117 Parts List RESISTORS mas Metal oxide film 4
49. n on the power amplifier output circuit The reverse bias of Q6 base from D6 and R19 R21 disappears when the power supply is set from ON to OFF Q6 remains ON due to residual power supply voltage C4 very rapidly discharges Q7 base potential drops and 97 becomes OFF The relay releases and the power amplifier output circuit will be cut OFF NOTE Q5 is normally OFF due to base bias and does not participate in the muting operation Detectors eq Fig 13 Relay driver circuitry Operation by Detector Circuit Command Commands from the detector circuits pass through one of D4 or 05 and are applied in the form of a current flow Q5 is normally reverse biased through R14 but when a large current flows through one of these diodes Q5 base potential declines according to the voltage drop at R14 Q5 then turns ON Q6 base potential rises and Q6 switches ON C4 rapidly discharges and Q7 base potential drops turning Q7 OFF The relay releases and the power amplifier output circuit will be cut off 2 Overload Detector Circuit Shorting of the power amplifier load or a load impedance below the specified value causes a command to be sent to the relay drive circuit This operating principle is shown in Fig 14 With the output stage in class B operation and Qa operating on the positive half cycle Qb will be cut off and the signal current will flow as indi cated by the solid arrows in Fig 14 Point D potential at this time is
50. ns in minimum distortion position Set FM SG for 100dB output and adjust VR3 so that the signal meter indicates 4 6 on the scale AC voltmeter Distortion meter FM SG FM signal generator 3002 Dummy 10 3 MPX SECTION 1 Through 300 ohm dummy antenna connect FM signal generator to 300 ohm FM antenna terminals 2 Connect multiplex signal generator to external modulation terminals of FM SG 3 Connect oscilloscope horizontal input to MPX SG pilot output and vertical input via probe to TP No 19 on the circuit board 4 Set SX 650 dial indication to 98MHz and adjust FM SG for center scale indication on Tuning meter Lissajous 650 5 With FM SG unmodulated adjust VR5 so that lissajous pattern on oscilloscope becomes stationary 6 With MPX SG modulation 1kHz L 67 5kHz deviation and Pilot 7 5kHz deviation adjust T4 for minimum distortion 7 Adjust VR4 for minimum signal leakage for R channel to L channel and from L channel to R channel NOTE Signal at terminal No 19 is 76RHz sawtooth wave and MPX SG pilot out is a 19kHz sinewave These form Lissajous figure Oscilloscope MPX signal generator Distortion meter AC voltmeter FM signal generator 35 11 EXPLODED VIEWS NOMENCLATURE OF SCREWS WASHERS AND NUTS The following symbols stand for screws washers and nuts as shown in exploded view Description
51. ory The 25 5 setting is used only when listening to FM Dolby transmissions When listening to FM Dolby transmissions it will be necessary to use an NR adaptor which can be purchased separately More detailed instructions will be found in the section FM Dolby Antenna should not Reception be placed where it will be subject to electrical interfer SN ence from motor Ground wm EM FM de emphasis switch For normal FM reception this switch ANTENNA PLACEMENT Direction of signals Make note of the following 1 5 meters 5 ft above points when choosing a loca tion for the FM antenna More than 4 meters 15 ft above ground Feeder wire and cable Length should be a should be insulated at short as possible mounting points Feeder wire should not be coiled VIEW Turntable Cartridge tape deck for playback 8 22 PLAY REC PLAY TA 8 9 650 AC outlets Switched Power to this outlet is controlled by the SX 650 power switch When power to the receiver is this outlet will provide AC current 150 watts maximum Unswitched Power to this outlet is not controlled by the SX 650 power switch As long as the power cord is plugged into a live outlet this outlet will supply AC current maximum 300 watts alae en em e AIC Blo aa
52. ot be supplied PI9M PJeod O d LLO NDIV 0 S NOHd linc 9 0 3 Ajquuasse 4y pue saun NOILONN H 5 ZZ0 JV 1 18205 Joloauuoo 2 dio 9 X 8 10151591 2195 6ZL ADV 3 42018858 SEL AOV dijo PART 4 POWER SUPPLY NOTE Parts indicated in green type cannot be supplied 117 Fuse AEK sx 650 11 6 PART 5 POWER TRANSFORMER Power transformer Parts indicated in green type cannot be supplied ATT 315 MODEL KC ATT 303 MODEL KU Holding metal Capacitor cover AEC 279 Ground terminal board 4 6 Grour terminal board Shield cover 11 7 PART 6 POWER AMPLIFIER NOTE Parts indicated in green type cannot be supplied Power amplifier assembly 2 GWR 101 N lt Cripe AEC 036 Power amplifier assembly 1 GWH 101 650 118 PART 7 REAR PANEL NOTE Parts indicated in green type cannot be supplied Power cord Strain relief Ferrite Bar antenna AEC 079 Strain relief AEC 079 Screw RT3 x6 ABA 002 Terminal GND AKE 017 De emphasis assembly 095 Terminal OUTLET lt 5 AKA 002 AKP 004 6555 Terminal SPEA
53. ower supply Q1 Q2 form a differential amplifier 100 d c feedback is applied from the junction point of the power stage to the base of Q2 so the potential of the junction point is always maintained at the same level The driver and output stages are Darlington con nected and a complementry symmetrical circuit is formed using a specially developed hybrid IC Fig 10 This ensures dynamic balance at different input levels Fig 11 SP 40W block circuitry 4 6 PROTECTION CIRCUIT This circuit protects the power transistors in case of overload the speakers in case of power amplifier malfunction and also performs a muting function when the power supply is operated ON OFF The protection circuit is composed of three sections Fig 12 Mid point potential d Fig 12 Block diagram for protection circuitry 1 Relay Drive Circuit The relay which connects the output circuits is driven by this circuit It also performs a muting function to prevent unpleasant noise during ON OFF operation of the power supply and cuts the output circuit on command from the detector circuit Muting Operation When the power supply is set from OFF to ON Q6 base is reverse biased through D6 and R19 R21 turning Q6 OFF Q7 base potential rises when C4 charges through R22 and R23 and Q7 turns ON several seconds later The collector current of Q7 then flows through the relay coil operating the relay to tur
54. owever if there is a difference between the terminal inputs the difference is amplified and becomes the output between the two collectors During normal operation an AC signal only is present at the junction point As C2 reactance is sufficiently low the same signal is applied to Q3 and Q4 bases resulting in an absence of output at the collector sides When a DC potential is produced at the junction point it becomes the input of Q3 only If the voltage is negative Q3 collector current declines And at Q4 the collector current increases and the potential drops causing current to flow through D4 If the DC voltage is positive Q3 collector current increases and the potential drops while at Q4 the collector current decreases and potential rises Current therefore flows through D5 4 7 POWER SUPPLY Two windings are provided in the power trans former secondary and each is separately bridge rectified One of these is sent as 296VDC to the voltage stabilizer circuit to become 13V 33V and 34V regulated voltages for supply to each assembly other secondary voltage is bridge rectified and becomes 36V for supply to the power amplifier power IC stage Extremely low power supply impedance is maintained by a 8 000uF electrolytic capacitor S SWITCH UNSWITCHD 120V 60Hz ILLUMINATE p PL PL L Pe power Ino Fig 16 Power supply circuitry 16 5 BLOCK DIAGRAM FM TUNER ANTENNA
55. steps 4 11 to eliminate variations ir AM VM indications at points A and C AC voltmeter AC VM opi 5 1kQ AM signal generator AM SG 10 2 FM SECTION 1 34 Through 300 ohm dummy antenna connect FM signal generator to 300 ohm FM antenna terminals and set for 400Hz at 100dB and 100 modulation Connect AC voltmeter and distortion meter to REC jack L R Set FUNCTION switch to FM and MUTING switch to OFF Set FM SG and SX 650 dial indication to point A 90MHz Adjust L3 for maximum indication on AC VM Adjust T2 lower core for center of scale indi cation on tuning meter Set FM SG for 9dB output and adjust L1 and L2 for maximum indication on AC VM Set FM SG and SX 650 dial indication to point C 106MHz Adjust then TC1 and TC2 for maximum indication on AC VM 10 11 12 13 14 15 16 17 18 Again set SG 5 650 dial indication to point A Adjust L3 then Ll and L2 for maximum indication on AC VM Repeat steps 8 11 to eliminate variations in sensitivity at point A and C Adjust T1 for maximum sensitivity Detune to noise only and adjust T2 lower core for center of scale indication on tuning meter Set SX 650 dial indication to point B 98MHz and adjust FM SG for center to scale indication on tuning meter Set FM SG output to 60dB and adjust T2 upper core for minimum distortion Repeat steps 14 16 to eliminate variatio
56. t STEREO RECEIVER SIGNAL METER TUNING METER ME A TUNER AF ASS y AWE 015 5 n jJ Q 2SKS5 075 0 05 1320762 LJ rV lt 5192 Cs 0 01 560K Run VC Cr BP Re6 8K VRs56K L 22 OUT 04 05 01 2076 x3 ee AT De 2 1 eir 2 45 2 OFS oy CONTROL ASS V AWG 043 M 3V lt Qv RO 00K so 4 gt M 7 SWITCHES SPEAKERS TAPE VR BALANCE CONTROL VR VOLUME CONTROL s MODE STER LOUDNE OFF 34070 15 9 Y ud V 06 zs vy O mw 59055 O wy O Y Maxv3dS 1 0 HR P 1 i 154 ant 1 NR oV 5 8 G S7Gz 5 44 d 03104 3SIWH3H10 5537 0 477 NI SISYHdu3 30 6VS SS t SHO LI Yd 330 ONOW 03 7TWN9SIS ON 39 10 20 A 29739 8 5 0340 351 83 10 LANI ON 1v 1 3 2 20 gt SSII 3ONVMN310L 966 WHO NI 310 68016538 8 LVS 2 YOLINOL 181 93AOd 104
57. the pilot signal This loop is termed PLL and a 38kHz switching signal synchronized to the pilot signal is obtained and employed as the switching signal 2 Automatic Stereo Detector Presence or absence of the pilot signal is detected by 19kHz obtained from the PLL and phase comparator A voltage is then obtained at the phase comparator that is proportional to the pilot signal amplitude This voltage operates a trigger circuit If the pilot signal is present the switching signal is applied to the demodulator and the Stereo indicator lights up However if the FM muting signal is also applied to pin 12 the detector circuit goes to ground Therefore a switching signal to the demodulator is not supplied and mono re production is obtained 3 Demodulator This is a switching circuit employing two differ ential amplifiers Fig 5 The composite signal is applied to base of Q3 Q1 and Q2 are alternately switched ON and OFF by the switching signal L output Fig 5 Basic demodulator circuitry 650 The composite signal amplified at Q3 is de modulated by switching of Q1 and Q2 Q6 and Q3 are loosely coupled at their emitters by R1 R3 Q6 is driven in opposite phase to Q3 the small composite signal is demodulated by switching of Q4 and Q5 The demodulated signals in opposite phase are composed with the collector of Q1 and Q2 crosstalk is cancelled Adequate current flow is required in Q3 and Q6 for low distortion
Download Pdf Manuals
Related Search