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Pioneer SX-1250 User's Manual

1. scare 60 Power Amplifier Section Continuous Power Output from 20 Hertz to 20 000 Hertz Both channels driven 160 watts per channel 8 ohms 200 watts per channel 4 ohms Total Harmonic Distortion 20 Hertz to 20 000 Hertz from AUX Continuous Rated Power Output No more than 0 196 80 watts per channel power output 8ohms No more than 0 0596 1 watt per channel power output 8ohms No more than 0 0796 Intermodulation Distortion 50 Hertz 7 000 Hertz 4 1 from AUX Continuous Rated Power Output No more than 0 1 80 watts per channel power atout 8 ORMS us in No more than 0 0596 1 watt per channel power output 8 ohms No more than 0 0796 Frequency Response 5Hz to 100 000Hz Input Sensitivity Impedance POWER 1 V SOk ohms Output s sma s B C A B B C A C Headphone i lt Low Impedance Damping Factor 20Hz to 20 000Hz 8 5 30 Hum and Noise IHF short circuited A Network 100dB Preamplifier Section Input Sensitivity Impedance PHONG T rawas wawas ra 2 5mV 50k ohms 2 2 5mV 50k ohms MIC Vu sm vue 6 5mV 50k ohms pM gt d EM 150m V 50k ohms PLAY ae na Be Qa 150mV 50k ohms
2. 55 HIGH FILTER SPEAKER Sx SPEAKER 3 lt Li r S SPEAKER B pM Ett ER Sw SPEAKER C O O Ys nizi 7 SPEAKER SR 104 SxX 1250 S 15 4 DE EMPHASIS SWITCH ASSEMBLY AWX 101 for S type 5 2505 S 504 5 EN 15 5 AWE 068 4 gt AWE 068 No 1 68 No 5 AWE 068 No 2 Slide switch DE EMPHASIS ASH 017 Ceramic 1200p 50V CKDYA 122J 50 Ceramic 1200p 50V CKDYA 122J50 Ceramic 150p 50V CCDSL 151K 50 Polystyrene 510p 50V Polystyrene 510p 50V Ceramic 56p 50V COSA 511J 50 COSA 511J 50 CCDSL 560K 50 107 15 5 SPEAKERS SWITCH ASSEMBLY AWS 098 for type 2 14 SPA 13 5 SPB 16 SPC 150 Q SW Parts List of Speaker Switch Assembly AWS 098 for HG type Push switch SPEAKERS ASG 100 Metal oxide resistor 150 3W Metal oxide resistor 150 3W RS3P 151K RS3P 151K Phone jack PHONES AKN 010 SX 1250 HG 15 6 SUPPLY ASSEMBLY AWR 108 for HG type 5 330 2 i a 4 2 51801 04 x4 3 FULIA 001 250 x4 4 3 85V 3 YNO gt 100200 e 3 T L 1 D 1 GND Dk FU 40 OrD OC 87 5 10 2W 5 FUs 5 5 y ir i a 1 SIBOI 01 2 EX pre e
3. cnn M ES LLL A Wi an REC PLAY REC PLAY OUT IN 1 POWER AMPLIFIER u n AM LU d RM 2 3 Pass Over current n yu Over load Relay 3 Rectifier ower amp fs 6 4 Gr D J Protection AN EH SPEAKER A x circuit P3WER A oJ IN T jt be Di XZ PEA B 0V d E Reloy drive au 4 a i amp i w AC outlets lt 6 qe lt SPEAKER Rectifier section fsx ar 77 S ae dime 1 AR SHK K e SPEAKER A P 15 AM tuner AUX RS f pa 7 E Xj SPEAKER C scale illumination S2 E 2 R danant vU E 4 do K a 526 S23 9 Detector ES xx u eU Ps a eo 21 7 DISASSEMBLY Top Plate Remove the six screws A to detach the top plate Wooden Cover Remove the two screws B on each sideof the wooden cover Fig 25 Bottom Plate Remove the fifteen screws to detach the bottom plate SX 1 250 Front Panel Loosen the setscrews of TUNING and VOLUME knobs with a hexagonal wrench Remove all the knobs by pulling Remove the two screws from the top edge of the front panel Remove the three nuts from the sub tone and volume control
4. 83 12 14 Power Amplifier Assembly 048 84 12 15 Speakers Switch Assembly AWS 095 88 12 16 Protection Circuit Assembly AWM 091 90 12 37 Stabilizer Assembly VAWR 108 ca actua mese aa severe 93 12 18 Power Supply Assembly AWR 407 asad aras esten ut wa lora nO nula 96 PACKING SG Ciao via Vra RE a RIVER OR OE OR 98 PARTOS LISI OF EXPLODED VIEWS lt a cia eR IW NUES MUS ES i Bx was 99 SUPPLEMENTS FOR SX 1250 HG AND SX 1250 S aatem Ce m a e EON elem bless CM 101 Dharan for Lou ou ss dark ORE EIS 103 15 3 Sihemetie Diagram for S C12B0 HG are ASGC m 105 15 4 De emphasis Switch Assembly AWX 101 for S type 107 15 5 Speakers Switch Assembly AWS 098 for HG 108 15 6 Power Supply Assembly AWR 108 for HG type 110 1 SPECIFICATIONS Semiconductors UA Ellas Mapa al 5 Hee d BiG ernie ar xd 6 vus XI 82 Z uuum Su saua
5. H SM n 0 CIC PITT 119199 AWF 021 No 6 MIL D AWX 097 No 5 AWF 021 No 10 FM TUNING METER 2 068 No 34 AWE 068 No 35 AL LA AWR 106 No 9 E AWE 068 No 15 r 5 PLis mage WE P a O O AWE 068 No 10 Ear gt AWE 068 No 33 COP AWE 068 SI METER DX gas TM 20 6 AWE 068 No 17 AWG 042 28 AWE 068 22 AWM 089 3 AWE 068 19 AWG 042 26 AWM 089 No 6 AWE 068 No 18 69 1 i 2 12 9 FLAT AMPLIFIER ASSEMBLY AWG 042 gt gt i ed c I LJ pm re MET ver Co ner 26 58700 Yeu Hj y VP _ c s soOAIAI P lt lt t lt lt 2 SIS o ex r rt MOLE a e cn Fu c c c a od 70 AWR 106 10 AWE 068 39 AWR 106 14 5 1 250 062 6 TAPE 2 REC G AWS 094 No 44 AWM 091 No 3 TAPE 1 REC A AWG 041 No 2 AWX 062 No 1 AWS 094 No 45 089 No 11 TAPE 1 AWM 089 No 14 2 REC L G AWG 041 No 9 TAPE 1 PLAY
6. 152473 551 55151 Electrolytic CEA 470P 80 Electrolytic CEA 470P 80 Electrolytic CEB 102P 25 Ceramic CCDSL 820 50 Electrolytic CEA 470P 10 Electrolytic 220 10 Electrolytic CEA 221P 16 Electrolytic CEA 470P 10 Electrolytic CEA 470P 10 Ceramic ACG 004 Description RD PSF 272 RD APSF 272 Carbon film 2 7k Carbon film 2 7k Carbon film 2 7k RD PS 272J Carbon film 2 7k RD4PS 272 Carbon film 8 2k RD PS 822 Ceramic 004 004 Ceramic ACG 004 Carbon film 822 Carbon film 1k RD amp PS 102 Carbon film 1k RD PS 102 Carbon 22k RD 4PS 223 Carbon tilm 22k RD 4PS 223 Description Carbon film 16k 014 5 163 Heat sink ANH 237 Carbon film 16k RD1 4PS 163 Heat sink ANH 300 Metal oxide 680 2W RS2P 681K Transistor socket AKH 002 Metal oxide 1 5k 2W RS2P 152K Insulator wafer ACE 088 Metal oxide 3 3k 3W RS3P 332K Contact strip 3p L type AKM 024 Metal oxide 3 3k 3W RS3P 332K Contact strip 5p L type AKM 025 Carbon film 3 9 Vw RD 4PSF 3R9J Metal oxide 100 2W RS2P 101K Carbon film 1 5k RD XPS 152 Carbon film 1 5k RD 4PS 152 Carbon film 1k Carbon film 1k Carbon film RDWPS 102 RDXPS 102 RD 4PS 102 95 12 18 POWER SUPPLY ASSEMBLY AWR 107 Microtemp 3 3 20 10318 A R 2 2 C 2W 851
7. 623JNL RD 4PS 204JNL RDXPS 101J RD PS 101J Carbon film 16k Carbon film 16k Carbon film 1 5k Carbon film 62k Carbon film 220 RD PS 163 RDXPS 163J 014 152 RD PS 623JNL RDXPSF 221 Carbon film 220 Carbon film 1k Carbon film 47 RDIPSF 221 RD APSF 102 RD 4PS 470 Be Carbon film Carbon film Carbon film Carbon film Carbon film Metal oxide Metal oxide Metal oxide Metal oxide Wire wound Wire wound Carbon film Carbon film Wire sound Wire wound Carbon film Carbon film Metal film Metal film Metal oxide Metal oxide Carbon film Carbon film Carbon film Carbon film Semi fixed Semi fixed Description Metallized mylar 1 Electrolytic Ceramic Ceramic Electrolytic Ceramic Ceramic Mylar Ceramic Ceramic Electrolytic Mylar Ceramic Ceramic Electrolytic Electrolytic Ceramic Ceramic 10 47p 120p 220 47p 10p 0 1 47p 47p 0 22 0 039 0 047 0 047 470 470 0 047 0 047 RD PS 470J RD PSF 621 RDPSF 101 RDX4PSF 101 RDXPS 103 RS1PF 101 RS1PF 101J RS1PF 102J RS1PF 102J RT5B RT5B 0R5K RDAPSF 220 RDPSF 220 RT5B 0R5K RT5B OR5K 01465 220J RD APSF 220J RN1H 4R7K RN1H 4R7K RS2P 100J RS2P 100J RDXPSF 122J RD PSF 122J RD APS 133 RDWPS 133 ACP 033 ACP 033 008 CEANL 100P 16 CCDSL 470K 50 CCDSL 121K 50 CEANL 221P 16 CCDSL 470K 500 CCDSL 100K 500 104 50 CCDSL 470K 500
8. AX Why VR SUB 55 2 i amp L qua e 8 mis T E n a 09 VR MAIN PASS e eR vA MAIN TREBLE VA SUB TREBLE 0 n i o 152473 5 f Sy LOW FILTER PROTECTION ASS y AWM 091 4 65v SPEAKER SWITCH 887 5 0 152413 02 53524 1 AWS 095 __ ___ SWITCHES POWER MUTING OFF QN 08 Sw RELAY FM MULTIPATH OFF ON 5 g gt L 4 FUSE HOLDER REED RELAY 4 P x a 37 2 SPEAKER Sn AM i RELAY z H edi 8 is Lch Sy FM FM DE EMPHASIS 25 5 5045 145 emm Sh PHONO 1 QFE E w S PHONO 2 MIC OFF E 1 WA Eb AUX pell 6 Se MONITOR 1 RESISTOR i EET ds ki Sn MONITOR2 OFF IN OHM 1 4W 55 TOLERANCE UNLESS R E Sn Sy DUPLICATE OTHERWISE NOTED KA MO x 0 PR to 7 5 ADAPTOR CV SIGNAL VOLTAGE AT SPEAKER OUTPUT 9 80 i 2 Se i TER CAPACITORS 1 gt DE CURRENT AT NO INPUT SIGNAL s ai 2212 u N JNLE 006 NO pF 5 Su LOUDNESS DE VOLTAGE AT NO INPUT SIGNAL pe da D D Sy TONE 25 945
9. Carbon film 11k RD PS 243J RD PS 113J RD PS 113 Mylar 183 50 Carbon tilm 10k RD 4PS 103 Mylar 0 018 50V COMA 183J 50 Mylar 0 018 50V COMA 183J 50 Carbon film 10k RD PS 103 Mylar 0 018 50V 183J 50 Carbon film 24k Ceramic CKDY A 222J 50 Carbon film 24k Carbon film 11k RD PS 243 RD XPS 243 RD PS 113 Ceramic CKDY A 222J 50 Carbon film 11k RD PS 113 Electrolytic 2 2 25V CEANL 2R2P 25 Electrolytic 2 2 25V CEANL 2R2P 25 Carbon film 100k RD PS 104JNL Electrolytic 2 2 25V CEANL 2R2P 25 Carbon film 100k Electrolytic 2 2 25V CEANL 2R2P 25 Carbon film 220k RD 4PS 104JNL RD PS 224JNL SX 1 250 Description 12 50V CCDSL 120K 50 Ceramic 12p 50V CCDSL 120K 50 Electrolytic 100 10V ACH 312 Electrolytic 100 10V ACH 312 Electrolytic 2 2 25V CEANL 2R2P 25 Electrolytic 2 2 25V CEANL 2R2P 25 Electrolytic 100 16V ACH 311 Electrolytic 100 16V ACH 311 Electrolytic 100 16V ACH 311 Electrolytic 100 16V ACH 311 Ceramic Ceramic 470p 50V Electrolytic 10 25V Electrolytic 10 25V Mylar 0 068 50V CKDYB 471K 50 CKDYB 471K 50 CSZA 100M 25 CSZA 100M 25 COMA 683J 50 Mylar COMA 683J 50 OTHERS _ 8 Lever switch TONE Washer faced nut ASK 090 ABN 024 79 1
10. Transistor Transistor Transistor Transistor RESISTORS 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 Carbon film Carbon film Carbon film Carbon film Metal oxide Carbon film Carbon film Metal oxide Metal oxide Metal oxide 25C945A O 2SC1647 P 2SC945A O 2SC1647 P 25A733 Q 2SC945A O 2SC1647 P 25 1166 25 1384 0 251166 7 2SC1384 O 1S2473 1S2473 182471 152473 152473 S5151R 55151 RD 4PS 753 RDXAPS 753 RD APS 222 RD APS 820 RD 4PS 820J RD 4PS 103 RD 4PS 153 RDWPS 153 0 405 222 RDXPS 154J RDWPS 153 RD 4PS 153 RD 4PS 683 101 4 5 913 RDXPS 123 01 4 683 RD APS 220 RD PS 153J 222 RS1P 211 RD PS 562 RD PS 682 RS2P 681J RS3P 332K RS3P 332K Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Ceramic Ceramic Ceramic Ceramic Ceramic Description Relay Contact strip 3p L type Contact strip 5p L type CEA 471P 6 CEA 471P 6 CEA 4R7P 25 CEA 101P 16 CEA 101P 50 CEA 101P 50 CCDSL 101K 50 ACG 004 ACG 004 ACG 004 ACG 004 ASR 010 AKM 024 AKM 025 ge 1 1 227772 12 17 STABILIZER ASSEMBLY AWR 106 T Q 25 869 a 250313 B 875v
11. VCO 25V DETovt 0 2SC945A Killer 1 2 3 4 5 6 57 AWM 089 No 5 AWS 094 No 22 AWM 089 No 4 AWG 042 No 1 AWR 106 No 10 AWM 089 No 1 AWS 094 No 35 0489 No 7 AWS 094 No 31 M TUNIN 7 AWS 094 No 30 gt gt AWS 094 No 34 lt Rn 560K 232 259 O 36 037 038 039 040 041 042 FB L 2 2 uH Le 2 2 uH 0047 Ria 680 Ras 100K 100K R44 3 3K AWB 023 No F 2 3e Re 410 2 4 1 0 Go IO Y iw 152473 D 152473 A O 31 C5 0041 7 Ro Ris 10K 2 2K De 330 R46 3 3K Fi 71 2 Hano Fn D 2599 56 m o 30 of 1 Lr 1 47 8 is RT gt we 7SC945A AWB 023 No G 229 0 1137 mer 4K lt 47K 0 22V No Ss 1 3 VR 47K Qe SCS45A o o 0 as AWB 023 No H 544 E ow 4 S cyl 5 0 22 AM ANT 4 ucc os aor o a 6 n a BLU 130047 831 R VR3 150K 38 R42 BLK Cs 001 Res 150 680 aw Z z a ot ler o 28 1 2 2uH T C28 x E E 1 7 056 6 Re Cr C60 Cr 10 16 10 16 T D e2 2 85 HAI38 gy Pann 1 Ecele ES m Ca ATP Ws 039 023 No 026 ov ay 0 105 88 6 3Y i Los o oer R26 2 2K 12 4V o sp i o o 925 0 css OY 5 3 PU i 4 6 5 ME C
12. guide AWS 095 F a Wire supporter 1 Filter amplifier assembly AEC 151 AWM 089 Wire quide P B Fuse FU1 M 106 42 2 Fuse FU2 gt 106 Fuse FU3 AEK 106 Fuse FUA AEK 106 i 1 5A FU5 AEK 104 m gt ka Function switch assembly AWS 094 3 Control amplifier assembly Microphone jack assembly AWG 041 AWX 097 Flat amplifier assembly AWG 042 Rear Panel Component NOTE Parts indicated in green type cannot be supplied P Shield cover Terminal TAPE 2 030 Screw 3x8 _ 002 AC socket AC OUTLETS Terminal PRE POWER 005 AKB 030 Terminal FM DET OUT 019 E Terminal 1 030 De emphasis switch assembly Terminal SPEAKERS AWX 099 AKE 014 pum O Terminal INPUT Terminal ADAPTOR 030 033 n c BP connector assembly AWX 062 Rear panel Internal toothed lock washer ABE 006 3 8 Terminal ANTENNA AKA 004 RT 3 8 Strain relief 079 Screw 3x8 RT 3x19 RT 3x10 ABA 002 AC power cord Strain relief 77 ADG 013 AEC 079 Terminal GND 012 j RT 3x8 Ferrite Dorantenna DIE _ 051_ RT 3x6 Bar antenna holder W72 092 Lock plate 2 D 1 2 NENN
13. 2 150 50 ohms TAPE PLAY 2 DIN connector 150mV 50k ohms PHONO Overload Level T H D 0 1 500mV 1kHz PHONG iu ss sa 500mV 1kHz Output Level Impedance ws ugue oma ww 150mV TAPE REC 2 Weg em eu eel SOV TAPE REC 2 DIN connector 30mV 80k ohms PRE SEMEN I Total Harmonic Distortion 20Hz ot 20 000Hz 1 V output No more than 0 0296 Frequency Response PHONO RIAA equalization 30Hz to 15 000Hz 0 2dB 1 1 ohms AUX PLAY 10Hz to 50 000Hz dB lone Control BASS us wu utc NI MAIN 1098 100Hz SUB 5dB 50Hz TREBLE MAIN 31088 10kHz SUB SdB 20kHz Filter IS D eM 30Hz 12dB oct HIGIENE al Vsa 8kHz 12dB oct Loudness Contour Volume control set at 40dB position 6dB 100Hz 3dB 10kHz Hum and Noise IHF short circuited A Network rated power PREM ur ore e aware 75dB RUN EARE PEAS TA SE ih 90dB a uu sue wey gue mete dle eee eran 20dB FM Section Usable Sensitivity MONO 8 7dBf 3 0uV 300Q STEREO 14 5dBf 5 8 3000 Usable Sensi ie e p a sasa 50dB Quieting Sensitivity 1 5uV MONO 11 5dBf 4 14 V 300 2 STEREO 36 0dBf 695 V 300 2 Signal to Noi
14. 5 Ya PI P 8 23V FUa 17 Ls i 12 SS m Parts List of Power Supply Assembly AWR 108 for HG type SEMICONDUCTORS Description wwe CAPACITORS 8 4 7 5 01 04 5 01 04 0 01 A ACG 001 Ceramic 0 01 ACG 004 Electrolytic 470 CEB 471P 100 Electrolytic 470 CEB 471P 100 Electrolytic 470 CEA 471P 25 SIBO1 01 181885 51801 01 151885 Electrolytic 470 CEA 471P 25 RESISTORS Ceramic 0 01 ACG 004 Deep Wire wound 3 3 20W 003 infi m Metal oxide 2 2k 2W RS2P 222J ee Metal oxide 10 2W RS2P 100K Microtemp AEX 005 Metal oxide RS2P 100K Fuse clip 010 110 SX 1250 HG c F7 ee AWR 106 No 7 AWR 106 No 6 AWR 106 No 15 o AC INLET 220V 240V 50 60Hz AWX 096 No 1 AWM 091 No 2 111 PIONEER ELECTRONIC CORPORATION U S PIONEER ELECTRONICS CORPORATIO Kya ian i T mes CUTE Ze LISA PIONEER ELECTRONIC EUROPE N V i et si E vm Belo PIONEER ELECTRONICS AUSTRALIA PTY LTD F Br ae cir i Ei A ELI cil 1976 Printed in Japan 76B04Y 71H TE iT II Mt vta 50 IY Assy CE 2 CIO GMY ON 2JILVW3HOS Zi 1 1050500770 AGE AT SPEAKER OUTPUT 3Ev BQ AT N
15. AAD 113 8 2 REAR PANEL VIEW Terminal TAPE 2 AKB 030 Terminal TAPE 1 AKB 030 Terminal INPUT AKB 033 Terminal GND AKE 012 Bar antenna holder W72 092 Ferrite bar antenna ATB 051 Terminal ANTENNA AKA 004 Slide switch DE EMPHASIS ASH 015 nd m l eS gt IB MYN a a i CAUTION SPEAKER IMPEDANCE 0 i H v FRI C9 STEREO PECEIVER 40 DR MORE SPEAKER MODEL ER cdd 8 807 DR MORE SPEAKER a ponu CERTIFICATION THIS RECEIVER COMPLIES FCC RULES AND REGULATIONS PART 15 1182377 TOTA Y e damp o mre mre pega SPREE Wai A SX 1 250 Connector socket REC PLAY 007 Terminal ADAPTOR AKB 030 Terminal SPEAKERS AKE 014 Terminal PRE POWER AMP AKB 030 AC power cord ADG 013 AC socket AC OUTLETS AKP 005 Terminal FM DET OUT AKB 019 eu 8 3 TOP VIEW Electrolytic capacitor 22 0004 F 80V ACH 056 Relay S2 ASR 015 Power amplifier assembly AWH 048 Protection circuit assembly AWM 091 Tuning drum assembly AXA 070 FM front end AWB 023 Lamp assembly PL1 PL4 8V 0 3A AEL 056 Lamp board assembly AWX 096 29 Power transformer ATT 267 Electrolytic capacito
16. RDXPS 153 RDJPS 471J RDWPS 471 RD PS 562 RDWPS 562 RDXPS 224JNL RD 4PS 224JNL RDWPS 222J RD 4PS 471 RDWPS 222 RDXAPS 472 RD 4PS 222 RD 4PS 222 RDPS 822 RD PS 822 RDWPS 473J 0 4 303J RDWPS 473 RD PS 303J RDWPS 473 RDXPS 104 010 182 RD 4PS 182J RD 4PS 182 014 182 RDXPS 332 RDAPS 332 RDXPS 153 RD APS 562 RD1 4PS 102 RD PS 104 RD APS 564J RD 4PS 104J RD 4PS 181 RD 4PS 473 Sy mbol Description Description Electrolytic CEANL 4R7P 25 Mylar COMA 473J 50 Electrolytic CEANL 100P 16 Electrolytic CEANL 100P 16 Polystyrene film COSA 511J 50 R54 Carbon film RDPS 331 R55 Carbon film RDXPS 223 R56 Carbon film RD PS 223 Carbon film RD 4PS 223 R58 Carbon film RD 4PS 333 Carbon film RD APS 512 Carbon film RD PS 332 Polystyrene film COSA 511J 50 Electrolytic CEA 101P 16 Electrolytic CEA 010P 50 Ceramic CKDYA 332J 50 Electrolytic CSZA OR1M 35 Carbon film RD 4PS 393 Carbon film RD PS 222 Carbon film RD 4PS 101 Carbon film RD 4PS 470J Carbon film RD 4PS 151 Electrolytic CEANL 010P 25 My lar 332 50 Electrolytic CEANL 25 Mylar 332J 50 Polystyrene film CQSH 511J 50 Carbon film 681 Carbon film RD 4PS 102 Carbon film RD PS 473 Electrolytic CSSA 010M 10 Electrolytic CSSA 3R3M 10 Electrolytic CSSA R22
17. ua as T 1 Ws T F 1 E d a 43 ba WES 1 0 E 1 5 1 aay LI 7 im if Mt Es A 7 lt m ss 6 7 _ T EHTS Se e H 1 dier LENT RS 4 4 POWER AMP Asy AWH D4B R Es Ere ites peces werd S amp A n d Gn a Ae 3 9 ri t gom 8 iU 2 2i i F i XOU is amp j is pm A 34 SX 1250 S 4 5 r 6 IE cl da 2 ub i dd ON MO ELE ninama mul ET m TM AMEE y s ta 1 19045 DO 0 oo 1 ere FERT T Jamm ite ite LB em
18. Bis dg Speaker systems B operate E 6252 xb Speaker systems C operate NOTES 1 When any two buttons A B B C are de pressed simultaneously the corresponding pairs of speaker systems will come into operation However it is not possible to operate all three speaker systems at the same time even though all the buttons are depressed 2 For private listening through headphones return all the SPEAKERS buttons to the OFF undepressed position PHONES JACK Accepts stereo headphones WARNING Do not plug a microphone into the PHONES jack as damage the microphone POWER SWITCH After turning this switch ON there is a delay of some 6 to 8 seconds during which time the protection circuit operates to eliminate unpleasant noise TWIN BASS CONTROLS Adjust low frequency tone 100Hz Adjusts frequency band below 400Hz Control effectiveness at 100Hz is 8 50Hz Provides additional control for the frequency band below 200Hz Control effectiveness at 50Hz is 5dB TONE SWITCH In the OFF up position this switch causes the amplifier section to operate with a flat frequency response regard less of the tone control setting FM TUNING METER With the SIGNAL meter needle deflected to the right make fine adjustment by centering the FM TUNING meter needle indicating optimum reception SIGNAL METER For AM and FM station tunings AM tuning Tune for maximum deflection of the SIGNAL meter needle to the r
19. GND 2 8 a h a Rs G 4 V d 1 E 8 ia 50 1 FILTER AMP ASS y 0 ANM 089 Yy 1 AC 71 50 60 Hz TW 8 u Os Os LL 90mm aw FUNCTION SWITCH ASS y AWS 094 V5 P T Ea e oni 28299287 2 298600 SPEAKER SWITCH ASS y AWS 098 2 B 8 mu 2 750610 0 04 5 1 8 Me 1 La 4 Q4 Te 9 0 t Ago Iw vis 5c mu 3 SPEAKER C Os Dw 0 15066 4 Ow SWITCH Ass y AWS 034 2 FM OET GU 001 T EQUALIZER ASS y AWF 021 6 a 2547265 8 191175 4 5 2 00 1 601 6 ASS y AWG 042 TONE ASS y AWG 041 sv T ome s 2 FILTER AMP ASS y 0689 ben CD e 29015 QQ 28603114 7 Ca Dt 3 z MIC JACK ASS y d a 7 r E WE VR am 1028 a ak 01644 MK VAs 508 AASS VR MAIN BASS SUB TREBLE vA MAIN TREBLE PHONO O 5 PROTECTION ASS y AWM 09 4 Y SPEAKER SWITCH ASS y paros 3 0 12413 7 0182679 aa 2801106 x2 Mn 2 DDN 1 POWE
20. HAAS Wir 2801 553080671 LEO my EM j Wwe Ju EG 1 a 26 0 es ut daqa AU i il q XA SENF D 3 ex P 3 t 4 3 CR 1 m sn ni 351 mo cs Aj I Et LEX d lt 8 gt k 6 Y E i am a A eM a i dun 2 Rt Wr S wid __ Ero gwy 4 55 m 2 LM 3 5 0921 8 WWHOVIG 311 31 38 1 E o N p Fal 7 4 s 5 Waly 4 3u L z i 3 553001 THOS DN iv 301004 00 A s CHON 35 u3ei2 47 45 ON Le Laguia cem TOLL TWW adu tuwi nal LY aOR ws is 95 Ww BW Dr OLN 3553410 34v 85 Rr WHO M dH i HOL 95 uif DW Kd 5 sos GE wadu3 30 u4 85 s WU Dis 02M 4 a AWG wile 335 ua 5 m WD 0
21. P i lt b gt 2 gt LLI 06125 oc O Oo o O ERI _ a lt a MS LU v o pos ei lt V a SX 1 250 091 13 AWR 106 No 1 gt AWM 091 No 12 AWR 106 No 2 AWM 091 No 6 No 9 SSS a e a uu Rss 0 5 CSW AWM 091 No 5 AWR 106 No 13 POWER IN AWF 021 No 3 AWR 106 No 10 AWF 021 No 8 AWM 091 No 1 85 Parts List of Power Amplifier Assembly AWH 048 SEMICONDUCTORS LONE a Transistor 2SA750 E Transistor 2SA750 E Transistor 2SC1439 B Transistor 25 1439 Transistor 25 858 Transistor 2SA858 B Transistor 2SC1904A B Transistor 2SA899A B Transistor 2SD610 R Transistor 25 630 Transistor 25 869 Varistor STV 3H Varistor STV 3H Diode 151886 SIBO1 02 Diode 181886 SIBO1 02 182473 151886 51801 02 151886 51801 02 152471 152471 151886 51801 02 151886 51801 02 RESISTORS Description Carbon film 3 3k Carbon film 220k Carbon film 82 Carbon film 47k Carbon film 47k RD 4PS 332 RDPS 224JNL RD APS 820 RD 4PS 473JNL RD 4PS 473JNL Carbon film 82 Carbon film 62k Carbon film 200k Carbon film 100 Carbon film 100 RD 4PS 820J 014
22. by a bootstrap circuit C1 amp R1 The output stage Q4 amp Q5 is a com plementary symmetrical SEPP circuit The high voltage utility factor of the SEPP circuit provides a high maximum output voltage Dynamic range of the equalizer amplifier is therefore wide and over load input level at 0 1 distortion is 5007 rms at 1kHz Equalizer elements C2 C3 R2 R3 are polysty rene film capacitors with tolerances within 1 and metal film resistors with tolerances better than 1 These lead to a deviation with respect to the RIAA playback standard within 0 2dB Due to the balanced plus and minus power supply the input and the output points become essentially OV reducing click noise during FUNCTION switch operation Input Fig 7 Schematic diagram for Equalizer amplifier Tape and Adaptor Circuits With the DUPLICATE switch OFF the program source selected by the function switches are ob tained at the TAPE REC jacks Fig 8 TAPE 1 TAPE 2 Function switch Fig 8 TAPE REC jacks 74 The TAPE MONITOR 1 switch selects between the program source selected by the function switch and the input at the TAPE 1 PLAY jacks Fig 9 The TAPE MONITOR 2 switch selects between the signal selected by the TAPE MONITOR 1 switch and the input at the TAPE 2 PLAY jacks Fig 9 TAPE 1 2 PLAY PLAY N ON TAPE MONITOR 1 TAPE MONITOR 2 switch switch Function switch Fig 9 Tape mo
23. 004 01 35 2 22 o VR2 4 7K 27 AWB 023 o 24 688001 102 Reo 4 6 s WW Nice 37 FTT a o O 23 ta of oll 16o Ca C2 C 4 Cai C Yo a 1 T oo 11 N 41 25 o Tame Too T 150P F 100K AWS 094 38 222 4 m 6 R68 Tad o 41 55 250945 43 1 10 Rag lt 6 0 22 25 cel 9000 044 0 04 2 47K C25 Caz AWB 023 o 21 T Fs 6 60 iu amp Ra SRo 28 2R2 5 SRo 40 6 9 9 20 15 D2 Di 10 10 56K gt 56 ATK 7470 4 COG 776 Y Ca 410P o Se Oo ID oO O Oo ux OUO Ww X YL GNE UG A Ye AWM 089 No 2 AWS 094 No 39 AWS 094 No 41 lt AWS 094 No 37 Ci a ee E Qo NN ee B SX 1 250 FM DET OUT AWS 094 No 33 AWS 094 No 32 AWR 106 No 9 AWX 099 No 2 AWX 099 No 3 AWX 099 No 1 AWX 099 No 4 Parts List of Tuner Assembly AWE 068 SEMICONDUCTOR Description Transistor Transistor Transistor Transistor Transistor Diode Diode Diode Diode Diode Diode Diode FM IF transformer FM DET transformer AM oscillator coil AF RF coil FM ceramic filter FM ceramic filter FM ceramic filter FM ceramic filter AM ceramic filter Anti birby filter Anti birb
24. 100K 50 CEANL 3R3P 50 CEANL 3R3P 50 182 50 182 50 CKDYB 471K 50 CKDYB 471K 50 472 50 472K 50 CSZA 220M 16 Mylar Electrolytic 22 16V Electrolytic CSZA 220M 16 Electrolytic 220 63V CEA 221P 63 Electrolytic 220 63V CEA 221P 63 Electrolytic 100 35 101 35 Electrolytic 22 16V CSZA 220M 16 CSZA 220M 16 CEA 101P 35 Electrolytic Electroly tic SX 1 250 67 12 8 FUNCTION SWITCH ASSEMBLY AWS 094 I an j 18 Q 4213 26 Q OB PHONO 2 19 i Y 11 29 06 PHONO 1 07 22 43 40 42 FUNCTION Parts List of Function Switch Assembly AWS 094 E Push switch FUNCTION ASG 095 RD PS 101 RD4PS 101 RD PS 101J RD PS 101J RD 4PS 101 RD PS 101 Carbon film resistor 100 Carbon film resistor 100 Carbon film resistor 100 Carbon film resistor 100 Carbon film resistor 100 Carbon film resistor 100 Electrolytic capacitor 220 6V CEA 221P 6 SX 1 250 AWR 106 No 8 AWS 095 No 9 3 PLs AM PL FM T 3 PLio PHONO 1 3 PLi PHONO 2 PLi AUX AUX R AWG 042 No 18 AWX 097 No 6 AUX L AWF 021 No 7 AWF 021 No 4 AWX 097 No 7 AWF 021 No 1 WE 068 No 41 PHONO 1 L PHONO 1 R B a
25. 2 3 12 12 FILTER AMPLIFIER ASSEMBLY AWM 089 MUT OUT 2 33 4 93 b 13 aC 3 i OFB 0 1 20 Ra Rs Q 25V 4IK 22K 714 TE da Input 180 S2 B 8 O 910 Output B C 6 SWITCHS TRANSISTORS S LOW FILTER 0 0 2ASC1 3 gt 2 S HIGH FILTER 25 1345 D 4 FM MUTING SX 1 250 AWE 068 No 38 AWE 068 No 14 gt AWS 094 42 gt AWE 068 No 40 AWE 068 42 AWS 094 40 AWE 068 No 36 PRE OUT R PRE OUT L gt AWG 042 No 5 AWG 041 No 7 AWG 041 No 4 AWG 042 No 4 7 041 No 5 gt AWG 041 No 6 81 Parts List of Filter Amplifier Assembly AWM 089 SEMICONDUCTORS Symbol Description C8 Transistor 28C1313 G Mylar 104J 50 2SC1345 D C9 Electrolytic CSZA 4R7M 25 Transistor 2SC1313 G C10 Ceramic CKDY A 562 50 2SC1345 D C11 Ceramic CKD Y A 272J 50 C12 Electrolytic CSZA 100M 25 SWITCHES Symbol Description S1 4 Push switch LOW FILTER HIGH FILTER MULTIPATH FM MUTING RESISTORS Description Carbon film RD PS 474J Carbon film RD 4PS 104JNL Carbon film RDAPS 512J Carbon film RD APS 472 Carbon film RDMAPS 222J Carbon film RD 4PS 105J Carbon film RD APS 105 Carbon film RD 4PS 303J Carbon film RD APS 303J Carbon film RDXPS 102 Carbon film RD PS 224 Carbon film RD APS 474J Carbon
26. L AWX 062 No 4 AWS 094 No 14 AWX 062 No 3 TAPE 1 PLA ADAPTOR IN ADAPTOR TAPE 2 OUT L PLAY ADAPTOR OUT R DAPTOR TAPE 2 J IN L PLAY L AWF 021 No 9 Q i AWF 021 No 2 4 1 3 9 Ie 14 15 186 77 19 20 22 24 25 20 4 28 29 C29 004 29 N 0 720 16 87 25 872 ur Tom 1 32 220 16 n Ras 5 37 C31 4 2 330 35 1 2746 5 39k 22k 330 25 M Ke o 25017754 oey 16 A KT T RZ C 154775 a P y p c d a o ia w 1 5 45 2SK30AW Iu Spe 250 027 Rae 0 5 im au 2 C24 68 7 5V 15 Ji C23 68P 0 6V ir a a R o osp 94 908 K O O te 22K Rel Samy 2 0 56P R35 04 C S Rao 1 R39 B 2K Rig M UN 2SK30AW R29 820K R33 130K EN D2 1 1K 023 AA 0 R32100 Rao 820K TR mae 11900 ad 152473 2 fF o uU I 826 28 75K ZO 2 O C16 330P C 7 I Or D W 330 63 Res C15 330P C2 Ca 1 a1 47K 1 1 i 1 g i 022 1 R47 Com VR2 22K 7 22 4 90K R26 R48 Raz 330 63 47K Cie Cio 22K 2 7K i 4 100K HB re Parts List of Flat Amplifier Assembly AWG 042 Description 25 1775 25 1775 Transistor 25 872 Transistor 25 72 2SK30AW Y Transistor Transistor FET 2SK30AW Y Transistor 2SA725
27. Q1 and Q2 Q6 and Q3 are loosely coupled at their emitters by R1 R2 and R3 Q6 is driven in opposite phase to Q3 and its low level composite signal output is de modulated by switching of Q4 and Q5 The de modulated signals in opposite phase are combined at the collectors of Q1 and Q2 cancelling crosstalk Adequate current flow is required in Q3 and Q6 for low distortion However if the base bias voltage is raised the voltage range available at the collector is reduced and clipping occurs power supply voltage is limited by IC voltage requirement For this reason current from an external source is inserted at Q3 and Q6 collectors and become I1 and 12 in Fig 4 The same amount of current is removed at the emitters of Q3 and Q6 to become I3 and I4 in Fig 4 Q3 and Q6 therefore operate with adequate current and distortion in this stage is remarkably reduced A feedback amplifier amplifies the demodulated signal to produce the IC outputs gt am gt w s 3 ai 0 0 Ix1 2 38kHz E 19kHz i L 1 2 19 1 d STEREO indicator Lamp drive Fig 3 Block diagram for HA1196 12 Switching signal Composite signal Fig 4 Basic circuitry of demodulator FM Muting Circuit Fig 5 DC voltage emerges from pin 12 of IC HA1137 in the event
28. Se Rs 22 R6 2 2K RAMIS Ace 2501735 2509869 R3 100K R4 100K 75 628 254850 o v A oO k 02 Y W 9 Raq 150 C5 68 100K 100K 06 68 R45 150 gt R46 15 C1 1 Wem C R47 15K LO ed 8 4 6 5 4 3 2 1 0 5 e o 8 6 AWS 094 19 AWS 094 No 20 AWH 048 No 3 AWH 048 No 2 AWM 091 No 1 AWR 106 No 13 AWR 106 No 11 AWG 042 No 10 AWG 042 No 11 AWS 094 No 23 AWS 094 No 29 65 Parts List of Equalizer Amplifier Assembly AWF 021 SEMICONDUCTORS Q1 55 Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Diode Diode Diode Diode Zener diode Zener diode Description Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Metal film Metal film Metal film Metal film Metal film Metal film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film 2SA726S G 2SA726S G 2SA726S G 25 7265 6 2501776 0 28C1775A D 25C1775A D 25 1775 0 2SA872A D 28A872A D 2SC1735 D 2SC869 C 2SA850 D 2SA628A C 152473 152473 152473 152473 W2 240 WZ 240 RD APS 104JNL RD 4PS 104JNL RD 4PS 104JNL RD4PS 104JNL RD4PS 222 RDXPS 222 RDPS 124JNL RD4PS
29. YT 4 s ge gt 33 VRI NN Ei EE rs o WE VR1 T1 No 43 uy IT Mum amp DC Voltmeter lc e _ wr wm O FM Front End F Pu T 7 ir No 9 ____Tuner Assembly 37 9 3 o 5 022 e 38 POWER AMPLIFIER Turn VR2 fully counter clockwise before turn ing on the power Remove jumper plugs connecting POWER IN and PRE OUT jacks Connect 5 1 k ohm resistor to POWER IN jacks Set power amplifier for no load Set POWER switch to ON Adjust VR1 for 0V between terminal No 9 and ground Adjust VR2 for 100mV between terminals No 7 and No 19 Allow set to warm up for at least 10 minutes then readjust Fig 34 9 44 STABILIZER 1 Adjust VR1 for 65V between terminals No 17 and No 12 ground 2 Adjust VR2 for 65V between terminals No 12 ground and No 16 Stabilizer Assembly Power Amplifier Assembly a Fig 35 SX 1 250 10 DIAL CORD STRINGING 1 Remove the wooden cover and the front panel Dial Pointer Installation Caution 2 Remove the three screws to detach the blind Metal portion of dial pointer is plated If this sash Fig 36 7 section is touched directly by hand or fingerprints 3 Turn tuning drum fully clockwise as viewed and other impurities it is difficult to remove from X direction in Fig 37 dirt from aventurine finish As this is
30. es r 9 w POWER SUPPLY PROTECTION ASS y AWM 19 VA POWER SUPPLY AS8 y AWR 10 Ay erp 1 9 FUg 12A 110 120 SWITCM ASS y 220 240V 53 ese 094 FM FRONT END ASS y AWB 023 z _ FM AM TUNER ASS y AWE 068 A 004 51801 04 x4 Attn aw 0 rr 7 d 00 BOA 2 inm 81801 0 22 00 E FUNCTIO 7 SWITCH ASS y 190 120 220 AWS 094 50 60 Ha _ o FUSEHOLDER O 59 5 mA AV 2 0 258600 SPEAKER Swi 87 B 23 286193044 0 290610 2 2 0 0 ss ANS 095 4 B C 47P S00 Y SPEAKER INDICATOR i 8 ET ru e bc wg Lette am AWX 101 uc gt BV SORA x3 AUX O SWITCH ASSY AWS 094 2 Ce 00 EQUALIZER ASS y 021 2 2 2 A7265 4 29 1735 ao 230869 0 0 2 28C1775A 4 4 2 PHONO PHONO 2 Gwn 3 3 J 08 al idian j Ga 4 Ce a lt gt 00047 56 ASS y AWX 097 CONTROL 2 02K
31. film RD PS 104JNL Carbon film RD PS 512J Carbon film RD APS 472 Carbon film RD 4PS 222 Carbon film RDXPS 105 Carbon film RDPS 105 Carbon film RD 4PS 303J Carbon film RDPS 102 Carbon film RDAPS 303 Carbon film RD 4PS 224 CAPACITORS tion Mylar 0 1 50V 104J 50 Mylar 0 1 50V 104 50 Electrolytic 4 7 25V CSZA 4R7M 25 Ceramic 5600p 50V CKDYA 562J50 Ceramic 2700p 50V CKD Y A 272J 50 Electrolytic 10 25V CSZA 100M 25 Mylar 0 1 50V 104J 50 SX 1 250 12 13 MICROPHONE JACK ASSEMBLY AWX 097 1 Ci R3 39K 0 0047 C 5 0 0027 Rs 180K Um Co R2 nF eS va w w co CO eS A a 2 PHONO 2 R 2 L 5 094 27 AWS 094 18 AWS 094 21 Parts List of Microphone Jack Assembly AWX 097 CAPACITORS RESISTORS Description Mylar 4700 50 472150 4700p 50 472 50 Carbon film ers TOO Mylar 2700 50 272150 Carbon film 5 184JNL Mylar 2700p 50V 272 50 Carbon film RD PS 393JNL Carbon film RD XPS 393JNL Carbon film RD 4PS 184JNL CKDYF 403Z 50 Ceramic Carbon film RD PS 184JNL Phone jack MIC vo1 oN ADL B 698250 5 Sl w s 15 cc8v 1 p SN
32. gn Y 92 FM Tunar coucou a wa ate yawn ddi Ee 36 9 3 Power Amplifier a TERR ER ears o a u aun sa 22 94 a ois oco y n 8 DIAL CORD STRINGING 39 EXPLODED VIEWS 40 SCHEMATIC DIAGRAMS P C BOARD PATTERNS AND PARTS LISTS 12 1 Miscellaneous parts 22 Iesv ER 51 13 14 15 SX 1 250 SOROS TRAY ene cab ee d ecd e La N s 53 12 3 Internal Circuitry of Integrated Circuits 55 124 The Circuit of FM Front End AWB 023 sireci cocus ES CLIE OR ewen 56 iA Auner Asembilv S O TT Vw Else as BSCS NUE 57 12 6 De emphasis Switch Assembly AWX 099 63 12 7 Equalizer Amplifier Assembly AWF 021 64 12 8 Function Switch Assembly AWS 094 68 EB Fist Amplifier Assembly AWG 042 2 70 T2510 DPConnactor ASSAD LANDON ia seis udin GYR GWYW id 46 75 12 11 Control Amplifier Assembly AWG 041 76 12 12 Filter Amplifier Assembly AWM 089 80 12 13 Microphone Jack Assembly AWX 097
33. gt E E UE x ie We 7 4 Malt FUNCTION SWITCH 557 au Aws 084 55 7 200 mA n n 5 EJ TC 0 0 4 mA 0 5 gt SPEAKER sg ASS y 0 Ds x amen 285055511 9 A B y tr iL SWN C Ry h q 0 3 5 20481866 1 Li 9 FM DE EHPHASIS Ta Q SWITCH ASS y gt Le 7 AWX 099 C na 0 K SWITCH ASS AWS 094 55 Set m gt D v I Gn SS IN TUE MST SISI n HE 8 eee 7 a e pP r 5 pes aux Eos MS 2 y s 5 238 d 15 0046 250630 29869 AWS 094 2 w e EPIRI mel 601 EQUALIZER ASS y 021 i 5 PHONO 1 6 0 9 0 TONE AMP ASS y AWG 041 fir T Lch SWITCH 55 0 6 04 8 4 AWS 094 JACK AWX 097 n L 0 ES Wee HK lt d Wn 0 Ud PHONO 7 542 MAIN BASS VR SUB BASS AIN TREBLE SUB TREBLE a 20 SPEAKER SWITCH ASSY f 5 0 152473 7 0 151473 2 2851186 2 i E sd rail rer SWITCHES m
34. reading on AC voltmeter Repeat steps 10 13 to eliminate variations AC voltmeter readings 35 9 2 FM TUNER FM Front End Es 2 3 4 13 12 13 14 36 Set function switch to FM Set FM MUTING switch to OFF Connect FM signal generator through 300 ohm dummy load to 300 ohm FM antenna terminals Set DUPLICATE switch to OFF and connect AC voltmeter to TAPE 1 REC jacks Set FM SG for 100dB output at 400Hz and 100 modulation Set SX 1250 dial indication and FM SG fre quency for 87 4MHz Adjust T5 core for maximum indication on SIGNAL meter Set FM SG for 8dB output and adjust cores of 1 T2 T3 and T4 for maximum reading AC voltmeter Set FM SG for 100dB output Set SX 1250 dial indication and FM SG fre quency for 106MHz Adjust TC5 for maximum SIGNAL meter Set FM SG for 8dB output and adjust TC2 TC3 and TC4 for maximum reading on AC voltmeter Repeat steps 5 12 to eliminate variations in AC voltmeter readings After completing above adjustments adjust T6 core for maximum reading on AC voltmeter indication on Bottom View of FM Front End 7 Tc O Fig 31 Tuner Assembly 15 16 I 18 19 20 21 22 23 Connect DC voltmeter to terminal No 43 Turn VR1 and VR3 fully counter clock wise Detune 5 1250 to where only noise is re ceived and adjust T1 core for center of scale indication on TUNING meter Set FM SG for
35. shafts Tone Amplifier Assembly Remove the three screws C Flat Amplifier Assembly Remove the three screws D Fig 28 Front panel Fig 27 Loosen the setscrews Speakers Switch Assembly Remove the four screws E p Microphone Jack Assembly Filter Amplifier Assembly Remove the two screws H Remove the two screws F Function Switch Assembly Remove the two screws G Fig 29 8 PARTS LOCATION 8 1 FRONT PANEL VIEW Knob FILTER 30Hz AAD 114 Knob SPEAKERS C AAD 114 Knob SPEAKERS B AAD 114 Knob SPEAKERS A AAD 114 Knob POWER AAD 113 Knob BASS 50Hz AAB 100 Knob BASS 100Hz AAB 100 Knob TONE AAD 113 25 Knob TREBLE 10kHz AAB 100 Knob TREBLE 20kHz AAB 100 Knob FILTER 8kHz AAD 114 Knob FM MULTIPATH AAD 114 Knob FM MUTING AAD 114 Front panel assembly ANB 386 ILLE DALANCE LEFT A 14124 t NOCHE SS E zz Sree 4 2 i 4 am Knob TAPE MONITOR 1 AAD 113 Knob TAPE DUPLICATE AAD 113 Sea i 7 Knob AAD 114 Knob FM AAD 114 Knob PHONO 1 AAD 114 Knob PHONO 2 MIC AAD 114 Knob AUX AAD 114 Knob Tuning AAA 034 Knob MUTING AAD 113 Knob VOLUME AAB 104 Knob LOUDNESS AAD 113 Knob MODE AAD 113 Knob BALANCE AAB 100 Knob ADAPTOR AAD 113 Knob TAPE MONITOR 2
36. 0 Phone jack MIC 013 P C board Push switch F LTER FM MUTING 5P Connector Assembly AWX 062 MULTIPATH ASG 098 connector socket REC PLA Y N AKP 007 P C board D ka D T 4 i Y g 10 50 12 SCHEMATIC DIAGRAMS P C BOARD PATTERNS AND PARTS LISTS MISCELLANEOUS PARTS 12 1 SEMICONDUCTORS 698 888588 SWITCHES Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor switch h POWE Relay Lamp assembly 8V 0 3A Lamp assembly BV 0 3A Lamp assembly 8V 0 3A Lamp assembly 8V 0 3A Lamp with leads 8V 50mA 5 Lamp with leads BV 50mA SP B Lamp with leads 8V 50mA SP C Lamp with leads BV AM Lamp with leads 8V FM Lamp with leads 8V 50mA PH 1 Lamp with leads 8V 50mA PH 2 Lamp with leads 8V 50mA AUX Lamp with leads 8V 50mA STEREO 266 2660 25058 25D555 H 25 600 25 600 2506 6 250555 AEL 056 AEL 056 AEL 056 AEL 056 AEL 074 AEL 072 AEL 073 AEL 076 AEL 075 AEL 074 AEL 072 AEL 073 AEL 069 NOTE Capacitors in uF unless otherwise noted p pF Resistors in HW unless otherwise noted k kQ M M2 FUSES Fuse 1A Fuse 1A Fuse 1A Fuse 1A Fuse 1 54 Fuse 12A primary Electrolytic Electrolytic Ele
37. 00k Carbon film 47k RD 4PS 104 RDXZPS 104 RD A4PS 473 Carbon film 47k RD PS 473 Electrolytic CSZA 4R7M 25 Carbon film 33k RD PS 333 Electrolytic a 52 4R7M 25 Electrolytic 4 7 25V CSZA 4R7M 25 Carbon film 33k RD PS 333 Electrolytic 4 7 25V CSZA 4R7M 25 Carbon film 8 2k Mylar 0 056 50V COMA 563J 50 Carbon film 8 2k Carbon film 47k RD PS 822J RD 4PS 822 RD PS 473 COMA 563J 50 Mylar Carbon film 47k 501105 473 Mylar 0 056 50V COMA 563J 50 Mylar 0 056 50V COMA 563J 50 Carbon film 33k RD PS 333 Polystyrene 390p 50V COSA 391J 50 Carbon film 33k Polystyrene 390p 50V 50 Carbon film 100k Carbon film 100k RD PS 333 RD PS 104JNL RD PS 104JNL CEANL 2R2P 25 Electrolytic 2 2 25V Carbon film 220k RD PS 224JNL Electrolytic 2 2 25V CEANL 2R2P 25 Electrolytic 2 2 25V CEANL 2R2P 25 Carbon film 220k RD PS 224JNL Electrolytic 2 2 25V CEANL 2R2P 25 Carbon film 4 7k Ceramic CCDSL 120 50 Carbon film 4 7k Carbon film 6 8k RD PS 472 5 472J RD PS 682 Ceramic CCDSL 120K 50 Carbon film 6 8k RD PS 682 Electrolytic 100 10V ACH 312 Electrolytic 100 10V ACH 312 Carbon film 24k RD PS 243 Electrolytic 2 2 25V CEANL 2R2P 25 Carbon film 24k Electrolytic 2 2 25V CEANL 2R2P 25 Carbon film 11k
38. 012 GS S a goon ecu RR ABA 012 1 Foot _ en P ch j Screw 4x8 AEC 178 e ABA 012 Screw 4x8 I ABA 012 Foot AEC 178 B Screw 4x8 ABA 012 RT 4 16 Foot lt 178 L RT 4x16 42 1 2 3 x 4 5 6 Top Side Component FRONT NOTE Rubber spacer Pulley shaft RT 3x8 RT 3x6 AEB 087 8 Parts indicated in green type cannot be supplied 1 RT 3x6 RT 3x6 Lamp assembly PL1 PL4 8V 0 3A A RT 3x6 AEL 056 ABA 114 Pulley E AEC 101 i RT 3x8 Lamp board assembly AWX I 96 EE RT 3x6 E Tuner assembly Em dct Rubber bracket B 086 Acrylic board p AEC 272 Indicator STER 028 Pulley shaft AWE 06 4 Pulley Tuning drum assembly 101 AXA 070 RT 3x6 Indicator SP A B C 026 Lamp with leads 8V 50mA gt N RT 3x6 SP A PL5 xs LS AEL 074 y Y SP B PL6 AEL 072 SP C PL7 AEL 073 STEREO PL13 Dial scale board AAG 106 RT 3x8 Equalizer amplifier LE I Np lt 2 bly Double meter SIGNAL TUNING E EN ped AAW 040 E AWF 021 AEB 085 3 FM front end AWB 023 Dial pointer AAF 051 FM PL9 2 AEL 075 AEL Tuning shaft assembly AEL 073 AXA 111 Indicator AM FM PH 1 PH 2 AUX AAT 027 E Washer 9 Pulley shaft M
39. 124JNL RDAPS 472J RD 4PS 472 RD1 4PS 102 RDXPS 102 RN SR 1541F 0 6 1541F 0 06 7502F RN1 2SR 7502F RNXSR 9103F RD PS 221 RDX4PS 221 RD 4PS 753JNL RD 4PS 753JNL 014 393J RDWPS 393J RD 4PS 221 Description 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 Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film CAPACITORS Metallized mylar 1 Metallized mylar 1 Ceramic Ceramic Ceramic Ceramic 47p 47p 68p 68p Polystyrene film 1000 Polystyrene film 1000 Polystyrene film 3500 Polystyrene film 3500p Electrolytic Electrolytic Ceramic Ceramic Ceramic Ceramic Electrolytic Electrolytic Mylar Mylar Ceramic Ceramic Mylar 470 470 27 27 10 10 3 3 RDPS 221 RDXPS 681 RD 4PS 681 RDWPS 470J RD 4PS 470 RD 4PS 470J RD PS 470J RD PS 560J RDPS 560J RDWPS 224J RDWPS 224 RD 4PS 472 RD APS 473 RDWPS 473 RDXPS 121 513 RDWPS 473 RD 4PS 472 RD 4PSF 151 RD APSF 151 0 4 153 RD PS 153 ACE 008 ACE 008 CCDSL 470K 50 CCDSL 470K 50 CCDSL 680K 50 CCDSL 680K 59 CQSA 102F 50 CQSA 102F 50 CQSA 352F 50 COSA 352F 50 CEA 471P 6 CEA 471P 6 CCDSL 270K 50 CCDSL 270K 50 CCDSL 100K 50 CCDSL
40. 13 AAD 114 AAF 051 AAG 106 AAP 037 AAT 025 AAT 026 AAT 027 AAT 028 AAW 040 ABA 002 ABA 012 ABA 081 ABA 087 ABA 113 ABA 114 ABA 116 ABA 123 ABA 129 ABE 006 ABE 018 ABH 022 ABN 021 ABN 022 ABN 023 ABN 024 ACG 001 ACG 003 ACH 056 ACV 163 ACV 165 ACV 166 ACV 167 ACV 168 ACV 169 ADG 013 ADG 015 ADH 002 ADX 029 AD X 030 ADX 031 ADX 032 ADX 033 ADX 034 ADX 035 ADX 036 ADX 037 Knob Knob Knob Knob Knob Dial Pointer Dial Scale Plate Blind Sash Shaft Cover Indicator Indicator Indicator Double Meter Screw Screw Screw Screw Screw Pulley Shaft Screw Screw Screw Washer Washer Coil Spring Nut Panel Base Washer Faced Nut Washer Faced Nut Capacitor HG S Capacitor KCU Capacitor Variable Resistor Variable Resistor Variable Resistor Variable Resistor Variable Resistor Variable Resistor AC Power Cord KCU AC Power Cord S FM Antenna Cable Housing Cable Housing Cable Housing Cable Housing Cable Housing Cable Housing Cable Housing Cable Housing Cable Housing 14 PARTS LIST OF EXPLODED VIEWS ADX 038 039 085 086 087 076 079 101 151 178 256 258 272 AED 018 AEK 104 AEK 106 AEK 109 AEK 301 AEK 402 AEK 404 AEK 405 AEL 056 AEL 069 AEL 072 AEL 073 AEL 074 AEL 075 AEL 076 AH A 107 AHA 108 AHC 026 AHD 341 AHD 342 AHG 037 AKA 004
41. 2 Parts List of De emphasis Switch Assembly AW X 099 SWITCH Es Slide switch DE EMPHASIS ASH 015 0 CAPACITORS sym C1 Mylar 1200p 50V 122J 50 C2 Mylar 12000 50V 1221 50 C3 Ceramic 150p 50V CCDSL 151K 50 63 m 2 3 12 7 EQUALIZER AMPLIFIER ASSEMBLY AWF 021 A A TO B B 6 C C 41 0 9 25 1265 0 25 850 25 81 2 192413 Qu 25617135 Ds c WZ 240 5 Q2 25 869 a es 7 G D 5 1250 47 R29 47 R30 47 R32 41 O A AAV o 062016 ASUSA Qs ET 2SABT2A Qs OSCWT5A 3 50 R36 200K 40 SP 20008 R36 220K Mo Pal FV 0 o NN R33 56 874132 02 04 152413 2 03 R34 56 B NM o 4 O AA 00047 R25 220 00047 R21 75K R27 680 a R22 75K 22 680 o N R23 39K 4tope R24 39K 1 0 oy les 7 3 48 5V 0 1 08 eill UB A ee 15 OK 220 63 6 0P K 220 63 220 Rao 120 LU ds i r 2 Rar 51K 13 27 bla 14 27 1 o H o E B 410 63 470 63 Ate 4 R39 BEA E Ris 154 T TX N R43 4 7K y aa 20K 93 65 X WI 2SAT26S D6 gt Vo O ANN 505 R Q5 1K Ria 4 ET Bo YOK m 60244 Qi Rs 47K 41 Q2 s 35 Qu 012 2541265 2SAT26S OV 0
42. 45 086 ABA 114 Nut 90 Pulley small B71 004 AEC 256 Shaft cover COCHIN AAT 025 Blind sash AAP 037 Panel base ABN 022 S T SS Pulley shaft ABA 114 Pulley small AEC 256 Bad 43 SX 1 250 1 E 2 3 4 5 T Top Side Component REAR x E NOTE Power amplifier assembly Connection cable housing Parts indicated in green type cannot be supplied AWH 048 V ADX 033 Connection cable housing Screw 3x8 gt ABA 002 d Protection circuit assembly Connection cable housing A x Y AWM 091 _ ADX 031 Connection cable housing Connection cable housing ADX 037 Stabilizer assembly ADX 036 0 a Transistor it _ AWR 106 ADX 030 VS 2 0555 d PM 3x16 RT 3x10 Connection cable housing ADX 034 A i ee Connection cable housing gt E Connection cable housing Ny AD X 039 E lt cod socket P Connection cable housing B 2 AD X 033 o _ Connection cable housing cala houi a 2 Ousin Transistor 9 Z AMX 029 gt ADX 032 2586006 Insulator wafer E B AEC 076 Screw 48 5 Power Amplifier assembly RT 3x10 ABA 087 AWH 048 f Power transform Electrolytic capacitor 22 000uF Electrolytic capacitor 22 000uF 80V Screw 3x8 2 9 ACH 056 4 002 Scr
43. 5 23 T D UNES LR D 3 z 0 25 D325R 8 62V 62V 2SC345A 5 4 1 2 3 Ris 33K C3w 22 000 80 AWH 048 No 3 AWM 091 No 1 22 000 80 AWF 021 No 8 AWH 048 No 2 l 4 AWH 048 No 12 AWF 021 No 3 AWH 048 No 15 AWR 107 No 9 AWG 042 No 2 AWR 107 No 8 AWM 091 No 3 AWS 094 No 1 AWS 095 No 9 AWR 107 No 10 AWE 068 No 15 Opp AWE 068 No 7 AWS 094 No 32 AWE 068 No 39 AWG 042 No 1 SX 1 250 Parts List of Stabilizer Assembly AWR 106 SEMICONDUCTORS Carbon film 1 6k RD PS 162J Transistor Transistor 2SC869 D Carbon film 1 5k RD4PS 152 Transistor 2SC1318 R Transistor 2SC1384 R Semi fixed 4 7k B ACP 034 Transistor 2SB507P E Semi fixed 4 7k B ACP 034 Transistor 2SA628A D Transistor 25A720 R Transistor 2SA684A R Transistor 2SD325R E Transistor 2 Electrolytic CEA 221P 80 Electrolytic CEA 221P 80 Ceramic CCDSL 820K 500 Ceramic CCDSL 820 500 Electrolytic CEA 470P 35 Transistor 2SC945A R Transistor 2SD325R E Transistor 25 945 Zener diode W2 240 Electrolytic CEA 470P 35 Diode 152473 Electrolytic CEA 220P 50 Zener diode WZ 240 Electrolytic 50V CEA 220P 50 Diode 152473 Electrolytic CEA 101P 35 Zener diode WZ 061 Electrolytic CEA 101P 35 Diode Diode Diode
44. 601 04 j Di D 5 4 da Ra 10 2W 46 C ru D 27 GND i D 4 je 10 x A 2SV 10 2W 0 Cio 0 01 150 ps D A 125V Ds L DO O D Ds i Fug Parts List of Power Supply Assembly AWR 107 CAPACITORS SEMICONDUCTORS Description Description Ceramic 0 01 ACG 001 Ceramic 0 01 ACG 001 Ceramic 0 01 ACG 001 Ceramic 0 01 ACG 001 Ceramic 0 01 ACG 004 51801 04 51801 04 51801 04 51801 04 51801 01 151885 Electrolytic 470 CEB 471P 100 Electrolytic 470 CEB 471P 100 Electrolytic 470 CEA 471P 25 Electrolytic 470 CEA 471P 25 Ceramic 0 01 ACG 004 8 1 151885 RESISTORS OTHERS Symbol Description Fuse clip AKR 013 Fuse clip AKR 030 Wire wound 3 3 20W 003 Metal oxide 2 2K 2W RS2P 222 Metal oxide 10 2W RS2P 100K Metal oxide 10 2W RS2P 100K MICROTEMP AEX 005 96 SX 1 250 Tan AWR 106 No 7 AWR 106 No 6 AWR 106 No 15 1 AWX 096 No 2 Ts WHT AC 120V AWM 091 No 2 i 60Hz a7 13 PACKING 98 Operating instructions ARB 164 Sheet Side pad L 2 AHA 107 00 8 T type antenna ADH 002 Hexagonal wrench ANK 018 Side pad R AHA 108 A a Inside packing ice RET 026 x a Packing case 341 English AHD 342 English French AAA 034 AAB 100 AAB 104 AAD 1
45. 7 TAPE 2 PLAY L AWG 042 19 i 2 PLAY 042 29 TAPE 2 R RD 4PS 394 RD 4PS 394 RD 4PS 104 RD 4PS 104J Carbon film resistor 390k Carbon film resistor 390k Carbon film resistor 100k Carbon film resistor 100k Connector socket 5p REC PLAY 007 75 12 11 CONTROL AMPLIFIER ASSEMBLY AWG 041 16125070 21612529 ce 2161252 t 0161252 9 76 Parts List of Control Amplifier Assembly AWG 041 SEMICONDUCTORS Transistor 25 1312 Carbon film RD PS 224JNL Carbon film RDAPS 472 Transistor 2501312 6 Transistor 2SC1312 G Transistor 2SC1312 G Carbon film RD PS 472 Carbon film RD PS 682 Carbon film RD PS 682 RESISTORS AND POTENTIOMETERS Carbon film RD PS 104 bon fil 5 10 LINER Ken MEN Variable resistor 102k 5 step BASS 50Hz Variable resistor 102 6k 11 step BASS 100Hz Variable resistor 102k 5 step TREBLE 20kHz Variable resistor 99k 11 step TREBLE 10kHz Carbon film RD PS 222J Carbon film RD XPS 222 Carbon film 222 Carbon film RD PS 222 Carbon film RD APS 102 ACV 165 ACV 166 ACV 168 Carbon film RD PS 102 ACV 167 CAPACITORS me owen r 380 Carbon film 100k Carbon film 1
46. 98MHz 60dB output Tune 5 1250 for exact center of scale indica tion on TUNING meter Adjust T2 upper core for 10mV between terminal No 43 and ground Adjust T2 lower core for minimum distortion Repeat steps 20 21 several times Set FM SG for 100dB output and adjust VR1 so that SIGNAL meter indicates 4 7 on the scale Multiplex Decoder 24 25 26 27 28 29 30 31 Connect MPX SG multiplex signal generator to the external modulator terminals of the FM SG and set the FM SG for external modulation Connect PILOT OUT terminal of MPX SG to horizontal input terminal of oscilloscope Using a probe connect oscilloscope vertical input terminal to terminal No 9 Set FM SG for 98MHz 60dB output un modulated Tune SX 1250 for exact center of scale indica tion on TUNING meter Adjust VR2 so that 4 1 frequency ratio Lis sajous see note below figure becomes sta tionary Set FM SG for 1kHz L 67 5kHz deviation 19kHz pilot signal and 7 5kHz modulation Adjust VR3 for minimum L R crosstalk Note Signal at terminal No 9 is 76kHz sawtooth wave and MPX SG pilot out is 19kHz sinewave These form Lissajous figure such as shown in Fig 32 Fig 32 SX 1 250 AC Voltmeter FT Distortion meter MPX Signal Generator lt ege a ne E o o Signal Generator Oscilloscope antenna eS
47. AKB 019 AKB 030 AKB 033 AKC 030 AKC 038 AKE 012 AKE 014 AKF 053 AKH 001 AKN 010 AKN 013 AKP 005 AKP 007 AKP 008 AKR 028 SX 1 250 Cable Housing Cable Housing Rubber Bracket A Rubber Bracket B Rubber Spacer Insulator Wafer Strain Relief Pulley Wire Supporter Foot Pulley Spacer Acrylic Board Mask Fuse 1 5A KCU S Fuse 1A KCU S Fuse 6A S Fuse 12A KCU S Fuse 1A HG Fuse 6 3A HG Fuse 1 6A HG Lamp Ass Lamp Lamp Lamp Lamp Lamp Lamp Side Pad L Side Pad R Inner Packing Packing Case KU S HG Packing Case KC Sheet Terminal Terminal Terminal Terminal Terminal Strip 2P Terminal Strip 2P Terminal Terminal Connecting Plate Transistor Socket Phone Jack Phone Jack AC Socket KCU S 5P Connector Socket AC Socket HG Fuse Holder 1P 99 031 Plug in Selector W72 092 Bar Antenna Holder AKX 031 Plug in Selector 2506555 Transistor 049 Wooden Cover 2SB600R Transistor ANB 386 Front Panel Ass 105 018 Hexagonal Wrench ARB 164 Operating Instruction ARB 168 Operating Instruction ARB 171 Operating Instruction ARD 089 Operating Instruction ASG 094 Push Switch ASG 095 Push Switch ASG 098 Push Switch ASH 015 Slide Switch ASK 080 Power Switch KCU ASK 084 Lever Switch ASK 090 Lever Switch ASK 092 Lever Switch ASK 099 Power Switch S ASK 105 Pow
48. AM FM STEREO RECEIVER Service Manual Q PIONEER MODEL Type m m IUS om 10 11 12 SX 1250 COMES IN THREE VERSIONS DISTINGUISHED AS FOLLOWS Remarks 120V only CSA Canada and UL U S A approved with de emphasis selector switch 25us 75us SEMKO Sweden NEMKO Norway DEMKO Denmark and El Finland approved General export model with de emphasis selector switch 25us 50us 75us When repairing S or HG type please see the manual on page 101 CONTENTS SPECIFICATIONS 02 RE ER ow 5 FRONT PANEL FACILITIES 770 27 6 CONNECTION DIAGRAM 9 CIRCUIT DESCRIPTIONS 4 1 Tuner Section IT TIPP 4 A 76 7 4 2 AudioSection s sia ou aii uu uu w 14 Luo O s s LL ull 2777 E37 Supply ERE HT 19 LA CYH 20 DISASSEMBLY TW FHS 22 PARTS LOCATION 8 1 Front Panel VW uz Y YO GOG AF WG OAOD Severe 25 8 2 Rear Panel View VN Siw ete 27 93 VOW ck el 29 84 Bottom ViSW lt is 31 8 5 Front View EA ries Eee a n Sala siw i n 33 ADJUSTMENTS AM Tanor oun a
49. APE s SPEAKER PHONO C x Sd ef EQ CONTROL AMP i x X dBV I SPEAKER 39V i AUX 15010 4 JU S SX 1 250 6 BLOCK DIAGRAM TUNER SECTION SWITCHES kc g gt m ist RF amp 2nd RF amp Mixer S POWER C SPEAKERS 526 SPEAKERS A FM 750 UNBAL FUNCTION 27 SPEAKERS B A T Su 528 SPEAKERS C gt ls 12 FM FM 3002 BAL Si3 PHONO 1 3 S14 PHONO 2 MIC 5299 FM MUTING S15 AUX 30 FM MULTIPATH SNO O11 g p 5 S31 FM DE EMPHASIS 1958 6 MONITOR 1 517 MONITOR 2 es Sig DUPLICATE 59 ADAPTOR 20 MODE 21 MUTING 8 LOUDNESS 599 TONE Sa LOW FILTER S25 HIGH FILTER AUX PHONO 1 EQ AMPLIFIER _ 8 07 PHONO 2 zi s REG PLAY REC PLAY OUT IN I i _ RIAA MIT O mw Buffer Tone Control Low 8 High Filter dul int S wa Qi ae 4 Eon s TE w syl 58 587 NIIT ie bI s 2 3 PRE OUT MIC ey 56 O WM L MB connector i t m 516 Papa o a pre OUT PHONO 2 E 5 5 EX o s Sia Sia I i PHONO 1 18 518 Cos 8 O O O
50. CCDSL 470K 500 CSZA R22M 10 393J 250 ACG 009 ACG 009 ACH 038 038 ACG 009 ACG 009 Heat sink AF choke 2 2uH Transistor socket Insulator wafer Contact strip 3p L type Contact strip 4p Contact strip 3p ANH 237 T63 009 AKH 002 AEC 088 AKM 024 AKM 034 AKM 033 SX 1 250 B7 12 15 SPEAKERS SWITCH ASSEMBLY AWS 095 Parts List of Speakers Switch Assembly AWS 095 LIN Push switch SPEAKERS ASG 094 150 3W 150 3W RS3P 151K RS3P 151K Metal oxide resistor Metal oxide resistor Phone jack PHONES AKN 010 r3 MES FN e d o 2 15 lt gt HO 5 7 E 0 6 87 53 o eq lt o un 9 5 2xEL ZSb 20 F T _ b AG pa e i d 0 HET 4 O a s 1 RA 5 6 22 000 80 C bC LT AWH 048 No 1 L m AWH 048 No 1 R 22 000 80 3 AWG 042 No 2 VLT AWR 106 No 14 AWR 107 No 12 AWH 048 No 12 AWR 106 No 11 AWH 048 No 15 AWH 048 No 3 AWF 021 No 8 AWH 048 No 13 L AWS 095 No 8 AWS 095 No 1 AWH 048 No 13 R 91 5 1250 Parts List of Protection Circuit Assembly AWM 091 SEMICONDUCTORS CAPACITORS Description Transistor Transistor
51. EN XN SxX 1250 1 2 3 Flat Amplifier Assembly AWG 042 NOTE Lever switch DUPLICATE Parts indicated in green type cannot be supplied Lever Switch MONITOR 2 08 AKS 092 Lever switch MONITOR 1 ASK 092 ever switch ADAPTOR ASK 092 Variable resistor 100k HB BALANCE ACV 163 ariable resistor 32 step VOLUME 169 board held metal Lever switch MUTING ASK 090 x Screw ABA 116 ever switch LOUDNESS ASK 090 Lever switch MODE ASK 090 Washer faced nut ABN 024 Union nut ABN 021 Control Amplifier Assembly AWG 041 Variable resistor 102 6 11 step BASS 1002 ACV 166 Variable resistor 102k 5 step BASS 501 ACV 165 Lever switch TONE ASK 090 Mariable resistor 99k 11 step TREBLE 10kHz ACV 167 Variable resistor 102k 5 step TREBLE 20kHz ACV 168 board held metal t man Washer faced A p QS ABN 024 Screw 3x6 ABA 116 Washer faced nut D ABN 024 board D 49 1 2 Switch Assembly AWS 094 NOTE Push switch AM FM PHONO 1 Parts indicated in green type cannot be supplied t PHONO 2 MIC AUX Switch Assembly AWX 099 A Slide switch DE EMPHASIS ASH 015 P C board Switch Assembly AWS 095 Push switch SPEAKERS A B C Microphone Jack Assembly AWX 097 B ASG 094 Phone jack PHONES AKN 01
52. G Transistor 25A725 G Diode 182473 Diode 152473 Diode 182473 Diode 152473 Lever switch DUPLICATE Lever switch MONITOR 1 Lever switch MONITOR 2 Lever switch ADAPTOR Lever switch MODE Lever switch MUTING Lever switch LOUDNESS Description Variable 100k HB BALANCE Variable 50k B2 VOLUME ACV 163 ACV 169 Carbon film 2 2k Carbon film 2 2k Carbon film 2 2k Carbon film 2 2k Carbon film 2 2k RDAPS 222 RDAPS 222 014665 222 RD PS 222J 0 4 222J Carbon film 2 2k Carbon film 4 7k Carbon film 4 7k Carbon film 330k Carbon film 330k RDXPS 222 RD PS 472 RD 4PS 472 RD PS 334JNL RD PS 334JNL Carbon film 330k Carbon film 330k Carbon film 1k Carbon film 1k Carbon film 1k RD PS 334JNL RD1 4PS 334JNL RD 4PS 102 1074 102 RD PS 102 Carbon film 1k Carhon film 1 1k Carbon film 1 1k Carbon film 47 Carbon film 47 RD4PS 102 RD APS 112 RD4PS 112J RD APS 470J RD PS 470 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 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 Metallized mylar 1 Metallized mylar 1 Metallized mylar 1 Metallized mylar 1 Ceramic Ceramic Electrolytic Elec
53. M 25 Ceramic CKDYF 403Z 50 Ceramic CCDWK 150K 50 Semi fixed C92 048 Semi fixed ACP 018 Semi fixed ACP 014 CAPACITORS Film trimmer ACM 002 Film trimmer ACM 002 Film trimmer ACM 002 Polystyrene film COSA 411150 CKDY A 103J 50 Electrolytic CEA 4R7P 25 Ceramic 4032 50 Ceramic 0 CKDYF 4032 50 Ceramic CCDSL 221K 50 Ceramic CKDYF 103Z 50 Ceramic CKDYF 1032 50 Ceramic CCDSH 0300 50 Ceramic CKDYF 103Z 50 Ceramic CKDYF 103Z 50 Ceramic CKDBC 473Z 25 Ceramic CKDBC 473Z 25 Electrolytic CEA 221P 16 Ceramic CKDBC 473Z 25 Electroly tic CEA 100P 16 Ceramic CKDYF 103Z 50 Ceramic CKDYF 103Z 50 Electrolytic 41 CSZA 35 Electrolytic CEA 221P 16 Ceramic CKDBC 4737 25 Ceramic CCDSL 150K 50 Ceramic CKDBC 473Z 25 Ceramic CKDBC 473Z 25 Electrolytic CEA R47P 50 Electrolytic CEA 470P 16 Ceramic CKDBC 473Z 25 Ceramic CCDSL 470K 50 Ceramic CKDYF 103Z 50 Ceramic CKDYF 1032 50 Ceramic CKDBC 4737 25 Ceramic CKDBC 2 25 Ceramic CKDBC 473Z 25 Ceramic CKDYF 1032 50 Ceramic CKDYF 103Z 50 Ceramic CKDYF 103Z 50 Ceramic CKDBC 4732 25 Ceramic CCKSL 391K 50 Ceramic CCDSL 391K 50 Ceramic CCDSL 151K 50 Electrolytic CSZA 100M 16 Electrolytic CEANL 470P 16 Electrolytic CEA 471P 16 SX 1 250 12 6 DE EMPHASIS SWITCH ASSEMBLY AWX 099 AWE 068 No 1 AWE 068 No 4 AWE 068 No 5 AWE 068 No
54. O INPUT SIGNAL E AT NO INPUT SIGNAL f 5 Dc oc ae A 4 i 5 7 a he 7 ie 1 1 E c Ul i v Aix w EC ay Lh aga 4 7 MI ELTVI 2 eg 5 y E 4 z c E E Tr 2 CAPACITORS E TR EE e L a 47 ET h i 19 i 4 HI Jb 4 47 Y Y Y Uim 4 PROTECTION Assy AwM 03 4 a EPS i lar gt T i PA 8 N o O O EL hel rn etm EIU LA h y A P 7 EE 11 2 SX 1250 H 15 3 SCHEMATIC DIAGRAM FOR 5 1250 FM FRONT END Ass Aw 023 at I 4 a 1 D w of n EA RT m i WD 4 3 3 335 ua Tox 5 ON Uw 39vi A JO EEF TENGE ON iw LN JC gt i5 d QI 39 qul 34 d DWN 14170 WGWYBd5 FOIA he bia DM TF W MEHL ENS SSS ND 3700 030161 Ss NI BOISE GM w 3 320 S 130 nie sa mid i NO HW WU 44 SWil 95 3435 2 FAIS
55. R OFF ON MUTING OFF ON FJ gg s My as SN Sn 5 El 5 RELAY MULTIPATH OFF ON d Fa 5 uw A i Ss AC VOLTAGE SELECTOR 1220y 2 240 S REED RELAY x 1 SPEAKER 5 QFE ON Sn RELAY O eh ouno KAKO Sa FM OFF ON AJ Sa PHONO 1 OFF ON gt 1 4 SQ PHONO 2 MIC ON SPEAKER AUX OFF ON Y Sow Sg MONITOR 1 OFF ON RESISTOR Swa 38 nas lal ki Sm MONITOR 2 QFE OMM 1 4W 55 TOLERANCE UNLESS AM mo 7 DUPLICATE iet OTHERWISE NOTED M MO i 1 S ADAPTOR SIGNAL VOLTAGE AT SPEAKER OUTPUT 38V 8Q Bit ES j L Fa x M G E CAPACITORS 06 CURRENT AT NO INPUT SIGNAL Pu HM y MUTIN UNLESS OTHERWISE NOTED P pF ne H s n LOUDNESS m P v DC VOLTAGE AT NO INPUT SIGNAL bs D Sn 25 945 O 2 D S LOW FILTER ofr et BY Reh Ss HIGH FILTER OFF iw SPEAKER Sg SPEAKER ON SCIO E Sn SPEAKER B OFF ON SS p gt SPEAKER C OFF ON LL SPEAKER I OW IBOW 105 5 1250 5 6 15 2 SCHEMATIC DIAGRAM FOR SX 1250 S 1100 8 52 WA c 200 mA LAMP ASS y
56. SK 092 Lever switch TAPE MONITOR 1 ASK 092 Lever switch DUPLICATE ASK 084 Double meter SIGNAL TUNING AAW 040 Push switch FILTER FM MUTING MULTIPATH ASG 098 Indicator AAT 027 Dial scale plate AAG 106 Tuning shaft assembly AXA 111 Push switch AM FM PHONOI 2 ASG 095 Phone jack MIC AKN 013 Lever switch MUTING ASK 090 Variable resistor 32 step VOLUME ACV 169 Lever switch LOUDNESS ASK 090 Lever switch MODE ASK 090 Variable resistor 100k HB BALANCE ACV 163 Lever switch ADAPTOR ASK 092 2 3 4 e 9 ADJUSTMENTS 9 1 AM TUNER T Set function switch to AM Connect AM signal generator through 1k ohm resistor to AM antenna terminal Set DUPLICATE switch to OFF and connect an AC voltmeter to TAPE 1 REC jacks Set AM SG for 400Hz 30 modulation 100dB output Set 5 1250 dial indication and AM SG fre quency for 600kHz Adjust T3 core for maximum reading on AC voltmeter Set SX 1250 dial indication and AM SG fre quency for 1 400kHz AC Voltmeter 11 12 13 14 SX 1 250 Adjust TC1 for maximum reading on AC voltmeter Set AM SG for 30dB output Set SX 1250 dial indication and AM SG fre quency for 600kHz Adjust T3 T4 and bar antenna core for maximum reading on AC voltmeter Set SX 1250 dial indication and AM SG fre quency for 1 400kHz Adjust TC1 TC2 and TC3 for maximum
57. W x 186 5 H x 464 5 D mm 21 7 8 W x 7 3 8 H x 18 1 4 D in Weight Without Package 29 2kg 64 Ib 4 oz With Package l 33 2kg 73 Ib 1 oz Furnished Parts FM type Antenna vsu era mh mmm Operating Instructions 1 POK ss ee mein ene a4 lt lt k 1 NOTE Specifications and he design subject to possible modifica tion without notice due to improvements HEX WRENCH The accessory Hex wrench is provided for removing the VOLUME and TUNING knobs or for tightening its setscrew in the event it becomes loose If required loosen the setscrew by inserting the wrench into the hole on the side of the knob and turning the wrench counterclockwise Be particularly careful not to scratch the front panel when employing the wrench 2 FRONT PANEL FACILITIES FUNCTION SELECTOR BUTTONS To select the program source push each button as follows NOTE Only one FUNCTION button should be depressed at a time 66 us For FM stereo reception Automatically 2 2 receives monophonically during FM mono phonic broadcasts The STE REO indicator lights up when the broadcast is in stereo TAPE DUPLICATE SWITCH Set this switch in the ON down position to duplicate or edit a recorded tape using two tape decks ADAPTOR 1 2 TAPE MONITOR 1 2 SWITCHES Set these switch in the ON down posi
58. W max deck etc can be plugged into this outlet By leaving the power switch of that compo nent in the ON position power supply to the component will be coupled with the SX 1250 lt switch operation AM ANTENNA Indoor or Outdoor 6 0 FM DE EMPHASIS SWITCH Normally set this switch to 75us Be sure to set it to 25us only when listening to an FM broadcast emphasis 25usec with a Dolby system NR adaptor con nected between the ADAPTOR OUT and ADAPTOR IN Se IT terminals RIGHT LEFT RIGHT RIGHT LEFT he word Dolby is a trademark of Dolby Laboratories Inc SPEAKER SYSTEMS A SPEAKER SYSTEMS B SPEAKER SYSTEMS C 4 CIRCUIT DESCRIPTIONS 4 1 TUNER SECTION FM Front End The FM front end is composed of a tuning circuit employing a 5 gang variable capacitor a 2 stage RF amplifier and mixer employing dual gate MOS FETs and a local oscillator with buffer An equiva lent of a cascode amplifier is produced by AC grounding gate 2 of the dual gate MOS FET allowing stable RF amplification at high gain The output signal of the RF amplifier is applied to gate l of the mixer stage MOS FET while the local oscillator output signal is applied to gate 2 This technique minimizes input power from the local oscillator resulting in low mutual interference even if the received signal input level is high A variation of a Clapp circuit forms the local oscillator Inclusion of a buffe
59. a 1 Ge XN An A3 3 POWE OFF ON Ss FM MUTING OFF ON E 7 Y FF E FF ON E x S RELA B uem z POWER AWH 048 AT af S ON Sa RELAY yn M AR S SE on e FM DE EMPHASIS 275 5 7545 isi jen Sy PHONO I OFF ON 3 S PHONO 2 MIC QFF ON cu SPEAKER Sis AUX QEF ON E T TH E Se MONITOR I ON RESISTOR i Sn MONITOR OFF ON 5 IN OHM WAW 25 TOLERANCE UNLESS 3 R Se DUPLICATE OFF ON OTHERWISE NOTED MQ gt 1 P E D D ADAPTOR ON SIGNAL VOLTAGE SPEAKER OUTPUT 8 6 1 5 of 4 1 is 20 mene A go gt DC CURRENT AT NO INPUT SIGNAL F 4 ON cU MUTIN 204 INF UN THERWISE Dp n d Bo 0 2 SPEARER LOUDNESS OFF ON v VOLTAGE AT NO INPUT SIGNAL T Vb 9 Sn E ON 5 6 2869845 x dac Ss HIGH FILTER OFF TI Jen De 15056 _ SPEAKER Sy SPEAKER ON i 3 ex j E Sm SPEAKER B ON L FL 7 Sa SPEAKER C OFF ON diis VU Wes SPEAKER ERE KHE 53 12 3 INTERNAL CIRCUITRY OF INTEGRATED CIRCUITS HA1137 FM IF IC ri M a UU EE cr e LC c
60. ctrolytic Electrolytic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Electrolytic Mylar Mylar COILS AND TRANSFORMER Ferrite balun Ferrite bar antenna Power transformer 0 01 0 01 AEK 106 AEK 106 AEK 106 AEK 106 AEK 104 AEK 301 T22 025 ATB 051 ATT 267 ACH 056 ACH 056 ACH 056 ACH 056 a CKDYF 1037 50 CKDYF 1032 50 CKDYF 1037 50 CKDYF 1032 50 CKDYF 1037 50 CKDYF 1032 50 CKDYF 1032 50 ACG 003 ACG 003 CEA 101P 6 104K 200 CQMA 104K 200 51 SX 12850 External Appearance of Transistors and ICs HA1137 HA1138 HA1196 96 207 25 684 1201 25 1384 2SB507P 2SB630 2SD313P 2SD325R TA7061 AP 1254567 250610 254628 25 720 25 733 25 750 25 858 25 872 2SC945A 2SC1318 2SC1439 2SC1775A 2SB600 2SD555 25 1342 25 899 25 1904 254725 2 6 200 25 710 25 869 E 25 1312 25 1166 T 25 1313 25 1735 12 2 SCHEMATIC DIAGRAM POWER SUPPLY ASS y AWR 106 s 2 875069 g PROTECTION _ AWM 081 1 4 POWER SUPPLY ASS y AwR 107 SWITCH ASS y FN POWER SUPPLY ASS y AWR 107 Tu AWS 094 4 FRONT END 5 AwB 023 2 HAI j 4 em gt EG
61. emarks Ceramic 0 01 150 0 01 250V DC1 4kV Ceramic 0 01 150V _ pci4dkV i Ceramic 0 01 250 001 Polystyrene 510p 50V 6010 Ceramic 50V EP CCDSL560K50 101 P C BOARD ASSEMBLIES De emphasis switch assembly 2 position 25us 75us 3 position 25 5 50 5 75 5 Power supply assembly AWR 107 AWR 108 AWR 107 Speakers switch assembly AWS 095 OTHERS _ sn AC socket OUTLET AKP 005 1 AKP 005 AC socket INLET AKP 008 1 5 Operating instructions 102 SX 1250 HG 15 3 SCHEMATIC DIAGRAM FOR SX 1250 HG 5 12000 8 1 gt 200 A 12 a JF LAMP Assy m AW X 096 s POWER SUPPLY ASS y AWR 106 BV eA 4 PROTECTION 7 AWM 2091 Y Oe 5151R Os 55151 SWITCH ASS y POWER SUPPLY ASS y AWR 1 FM FRONT END ASS y AWB 023 FM AM TUNER ASS y AWE 068 AWS 094 446 ce m 59 E pe lt aia ny P 4 2 i d 0 P s om a __ i I QE See T nA Dh Da 31801 04 x4 GR 7 amp Roga s ur A 1 7 H s i m DD 4 000 2 i xc P 2 OW amp 5 3 9 amp
62. epi do 7 e 4 12173 L nl HA1138 AM IC aty Dn 7 ni aa Tan z aues Mt xb du iw Hd MU Y 4 I s w r 5 1 250 1201 TA7061AP 12 4 THE CIRCUIT OF FM FRONT END AWB 023 Li Gr 0 001 li 0 001 Qs Rie 410 2801342 o6 1 2 3 4 5 6 12 5 TUNER ASSEMBLY AWE 068 A 33 34 35 B sT nK_ gt FO 0 25 Di D2 0 HA1201 2 HA1201 Ta Q4 TA TO61AP 1852076x p Ri NE 0 NIE 8 100 2 470 47 22 Piu 4 85 DE c 1 E 299 T TS 4 2 d 2 B 304 916 IF 319 2 7 1321 326 b MUTING Rss j O13 ouf i gr QJ 5 meter 20000 56050 O36 Multipath 000 sY r HOQ TT m ER 2 Tv TO AM O40 L out Loca 197 5 gt I Lr 00 95 d o lt T 74 24 08 AE OSC M o gr D ws e s eje TY 7 s 7P D O x 26 22 23 24 75 28117 18 38 E BENT AM LOCAL E RF AM AM AM Auto ST PILOT D VC B ANT S meter out IN 5 N 11 39 12 9 10 E B FM
63. er Switch HG ASR 015 Relay ATB 051 Ferrite Bar Antenna ATT 267 Power Trans KCU ATT 291 Power Trans S ATT 295 Power Trans HF AWB 023 FM Front End AW E 068 Tuner Ass AWF 021 EQ Amp Ass AWG 041 Control Amp Ass AWG 042 Flat Amp Ass AWH 048 Power Amp Ass AWM 089 Filter Amp Ass AWM 091 Protection Ass AWR 106 Stabilizer Ass AWR 107 Power Supply Ass AWR 108 Power Supply Ass AWS 094 Function Switch Ass AWS 095 Speaker Switch Ass AWS 098 Speaker Switch Ass AWX 062 5P Connector Ass AWX 096 Lamp Board Ass AW X 097 Mic Jack Ass AW X 099 Switch Ass KCU AWX 100 Switch Ass 5 AXA 070 Tuning Drum Ass AXA 111 Tuning Shaft Ass B71 004 Nut B71 010 Nut M45 086 Washer T22 025 Ferrite Balun 100 SX 1 250 15 SUPPLEMENTS FOR SX 1250 HG AND 5 1250 5 For servicing of the SX 1250 HG or 5 please refer to 4 100 with the exception of the power supply section the de emphasis selector which are described in this supplement 15 1 CONTRAST MISCELLANEOUS PARTS FUSES Remarks Lamp circuits 104 E E amp Primary voltage 110V 120V Primary voltage 220V 240V Primary voltage 220V 240V Remarks Stype ASK 099 POWER 2 position 4 position with fuse holder TRANSFORMER Part Name RESISTOR Part No Symbol mas bL CAPACITORS Part Name R
64. ew 4x6 o _ 5 128 _ Connection cable housing Wen E uM ADX 038 gt Screw 6 RT 3x10 128 3 A 295 E C RT 3x6 Insulator wafer AEC 076 Transistor 2SB600 R PM 3x16 i assis P FODSISTOT COVER us asas Transistor socket Connecting plate AKH 001 AKF 053 i k h 708 Transistor Binding head screw M 4x5 v Connecting plate RT 3x10 250555 3x6 D ABA 129 ANP 083 RT 3x10 Spring lock washer K ABE 018 Bindi head screw M 4x5 ABA 129 1 2 3 4 5 6 46 A Bottom Side Components 2 3 NOTE Parts indicated in green type cannot be supplied Fuse holder 1P AKR 028 Relay ASR 015 A Wire saddle Fuse 12A FU6 primary Ground terminal 21 K 301 i RT 3x8 RT 3x6 08 es E Chassis E a peto Wire supporter E 247 WWW AEC 151 _ 09 RT 3x6 lt he _ Wire saddle quel eem V 7 L Terminal strip 2P Shield plate B 7 AKC 038 we Terminal strip 2P 030 RT 3x8 B RT 3x Lever switch POWER ASK 080 Wire saddle NG round terminal 4P 3 RT 3x6 oat ra ar 0 8 J Ground terminal 2P ie board holder E board holder Power supply assembly L AWR 107 Wire saddle 3 Ww a Speakers switch assembly a 9
65. g lock washer and Tat washer UG Pan head screw with flat washer EXAMPLE PM 3x8 em audit inmm 52 thickness in mm diameter in mm d diameter in mm d Symbol Symbol Exterior Screw 4x15 ABA 113 B Front panel assemb Wooden cover AMM 049 ly ANB 386 x Washer faced nut ABN 024 Ec 9 3 7 y S 3 4 vu M lt E Knob BASS 50Hz 100Hz Knob TREBLE 10kHz 20kHz Knob BALANCE 100 OG Coil spring pacer AEC 258 Knob Tuning AAA 034 ABH 022 ABA 113 cr a Knob VOLUME AAB 104 Mask AED 018 lt SS gt a Screw 4 8 ABA 123 2 E T M s t 3 4 sss 2 5 Cb CP U AR M discas lt x 4 Ni wow de lt RT 3x8 Knob MUTING LOUDNESS MODE Knob POWER TONE ADAPTOR Knob TAPE DUPLICATE MONITOR AAD 113 Knob SPEAKERS A B C Knob FILTER 30Hz 8kHz Knob FM MULTIPATH MUTING 9522 Knob FM 1 PHONO 2 AUX 95 25 AAD 114 lt 5 1 250 4 _ 5 6 NOTE Parts indicated in green type cannot be supplied Screw 3x8 Screw 3x8 002 081 E x Screw 3x8 Top plate 002 ANE 105 1 B Screw 3x8 ABA 081 Screw 4x8 ABA
66. ight Both theSIGNAL and FM TUNING meters work together The optimum point of the SIGNAL meter needle is the same as in AM tuning Then use the FM TUNING meters SPEAKER SYSTEM INDICATOR FM STEREO INDICATOR FM tuning WPIOWEER STEREO RE EVEA MODEL 5 1250 TUNING KNOB Select the station and tune for optimum reception by observing the SIGNAL meter for AM stations and both SIGNAL and TUNING meters for FM stations FM MUTING BUTTON Leave this button undepressed in the ON position to suppress unpleasant interstation noise while tuning be tween FM stations Low strength signals may also be suppressed by this function so to pick up a weak station depress this button to the OFF position PROGRAM SOURCE INDICATOR 96 98 100 102 104 1 106 108 FILTER FM adf Biz MULTIPATH MUTING OFF Oo LOW CUT 30Hz FILTER BUTTON When low pitched rumble from turntable motor or other source is obstrusive depress this button to provide 12dB octave attenuation at freguencies below 30Hz If no interference is experienced release this button HIGH CUT 8kHz FILTER BUTTON When high frequency scratch noise from worn records or other source isunpleasant depress this button to provide 12dB octave attenuation at frequencies above 8kHz If there is no interference release this button 50 140 156 150 PHONO 1 PHONOP MIC AUX FM MULTIPATH BUTTON When selecting the best position for the FM anten
67. ircuit 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 is illustrated in Fig 20 With the output stage in class B operation when Qa is operating in the positive half cycle Qb becomes cut off and the signal current flows as indicated by the solid arrows in Fig 20 Point D potential at this time is the point 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 When RL is extremely small the point C potential becomes considerably lower than point D This potential difference forward biases Q1 Q1 turns ON and current flows in D3 17 Qb operates in the negative half cycle and Qa becomes cut off The signal flows is indicated by the broken line arrows in the center of Fig 20 Q1 is biased by the potential difference between point C and point E If RL is extremely small the point C potential becomes considerably higher than that of point E Q1 turns ON and current flows in D3 If large current flows in Qa and Qb Q1 becomes ON due to the RE1 and RE2 voltage drops and current flows in D3 C1 prevents faulty operation due to external noise Power amplifier oa Fig 20 Basic circuitry for overload detector 3 Center Point Potential Detector Circuit If a DC potential is produced at
68. na depress this button so that multipath noise is heard from the speaker systems To listen to FM broadcasts release this button TWIN TREBLE CONTROLS Adjusts high frequency tone 10kHz Adjusts frequency band above 2 5kHz Control effectiveness at 10kHz is 10dB 20kHz Provides additional control for the frequency band above 5kHz Control effectiveness at 20kHz is 5dB SX 1 250 MIC JACKS L and R For connect each channel jacks the left and right channel microphones NOTE Use the high impedance above 2069 with 6mm diam phone plugs VOLUME CONTROL Adjusts output level to speakers and headphones Scale is graduated in dB and when used in conjunction with the MUTING switch finer and wider range attenua tion can be performed See additional description on page 6 AUDIO MUTING SWITCH 20dB Depress this switch to attenuate the audio output by 20dB This convenient feature saves having to disturb the VOLUME control for example when answering the tele phone LOUDNESS SWITCH Depress this switch when listening at low volume The frequency response of the human ear varies according to the listening volume and the depressed position com pensates for hearing response by emphasizing the bass and treble MODE SWITCH For stereo playback leave this switch undepressed or depress to release if already depressed When depressed for MONO playback left and right channel stereo signals will be mixed to produce m
69. nitor circuit When the DUPLICATE switch is set to ON the TAPE 1 REC jacks are connected to the TAPE 2 PLAY jacks and the TAPE 2 REC jacks to the TAPE 1 PLAY jacks Fig 10 TAPE 1 2 REC RED PLAY oO 6 DUPLICATE switch Fig 10 Tape duplicate circuit The signal selected by the TAPE MONITOR 2 switch appears at the ADAPTOR OUT jacks Fig 11 The ADAPTOR switch selects between the signal selected by the TAPE MONITOR 2 switch and the input at the ADAPTOR IN jacks Fig 11 ADAPTOR OUT IN TAPE MONITOR 2 c switeh ADAPTOR switch Fig 11 ADAPTOR jacks MODE Switch When the MODE switch is set to the MONO posi tion the left and right channels are shorted in the stage following the tape and adaptor circuits 4 t BALANCE Control A no loss HB type variable resistor at center posi tion is employed An SEPP circuit is inserted as a buffer in the following stage Muting Circuit When the MUTING switch is set to the 20dB position the signal is attenuated by 20dB Loudness Circuit This circuit is operated ON or OFF by the LOUD NESS switch and is intended to compensate for audibility characteristics of the human ear at low volumes The VOLUME control variable resistor is tapped Connecting a CR network at this point enhances low and high frequencies at low volumes Tone Controls Twin tone controls are employed with the SX 1250 These consi
70. not desirable 4 Tie one end of cord to stud on inner section of in terms of both appearance and anticorrosion tuning drum more easily performed by loos take extreme care not to touch the metal section dus ac E temporarily removing tuning when handling the dial pointer 5 Route cord through tuning drum cutout make a half turn around the drum then route in sequence to pulley A 6 Wind cord 3 turns clockwise as viewed from rear panel around tuning shaft then route to Blind sash pulley B pulley C pulley D 7 Wind cord two turns around tuning drum and tie to spring hook so that tension is applied to the cord 8 Turn TUNING knob and confirm normal cord motion then trim off excess cord 9 Turn the tuning knob fully counterclockwise and fix the dial pointer to cord so that it indi cates 87 4MHz on the dial scale Fig 36 Starting point 87 4MHz FERA LLLI m HFH 1 ine Tuning drum Fig 37 3g 11 EXPLODED VIEWS NOMENCLATURE OF SCREWS WASHERS AND NUTS The following stand for screws washers and nuts as shown in view RT i i BT OCT Spring lock washer 3 screw Pan head machine screw M head machine men screw Eu rw socket headless set screw Oval head wood screw Binding head machine screw Oval es Se ER head screw with spring washer Pan F screw with sprin
71. ntary symmetrical parallel O Vet Fig 17 Schematic diagram for power amplifier 16 connection The output center point is at OV from the balanced plus and minus power supply while 100 DC NFB is applied to Q2 through R3 Because of this circuit DC gain becomes OdB and DC voltage of the output center point is deter mined by Q1 base voltage VR1 is a semi fixed resistor for fine adjustment of the center point voltage to compensate for irregularities in circuit elements SPEAKERS Switches The SX 1250 is provided with 3 sets of speaker terminals A B C Since the power amplifier can become overloaded if all three sets are used simul taneously when all 3 SPEAKERS switches are set to ON the circuit functions as if all switches were OFF and the indicator lamps extinguish 4 3 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 turned ON or OFF The protection circuit is composed of three sections Fig 18 Power amplifier Center point potent ial Fig 18 Block diagram of protection circuit 1 Relay Driver Circuit Fig 19 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 as well as opening the o
72. of more than 70kHz detuning or low input level less than 4 94 V antenna input conver sion This is employed for shorting the AF output circuit to perform muting by the reed relay rac 4 a u SX 1 250 Multipath Monitor Circuit When multipath reflections exist in the received signal the signal is converted into AM and PM amplitude modulation and phase modulation forms Since the amplitude of the actual FM signal is fixed by converting this AM component into a sound and listening to it the existence and amount of multipath reflection can be determined Short term level variations audio frequency are taken as a signal from HA1137 SIGNAL meter drive terminal pin 13 By setting the FM MULTIPATH switch to ON during FM reception this signal becomes connected to the audio ampli fier and can be heard as a sound which indicates conditions of multipath reflection AM Tuner The AM tuner employs a 3 gang variable capacitor and an IC HA1138 with 1 stage of RF and 2 stage of IF amplification Fig 6 shows the HA1138 block diagram see page 55 for circuit AF output circuit HA1137 Schmitd circuit Tl SIGNAL meter Fig 6 Block diagram for HA1138 13 4 2 AUDIO SECTION Equalizer Amplifier The equalizer amplifier is shown in Fig 7 The first stage Q1 amp Q2 is a PNP transistor unbalanced differential amplifier High voltage gain is provided in the following stage Q3
73. onophonic sound from both speaker systems BALANCE CONTROL Adjusts the balance between the sound volume from the left and right speaker systems or headphones 3 CONNECTION DIAGRAM TURNTABLE TURNTABLE TATR SIR lt open reel cassette TAPE DECK DOLBY NR ADAPTOR CARTRIDGE upachapa GNI 4 CHANNEL DISCRETE TAPE PLAYER E FM ADAPTOR MM mm ue AI was LINE LINE LINE LINE LINE LINE OUTDOOR INPUT OUTPUT INPUT OUTPUT ov lc FM ANTENNA 759 PRE POWER coaxial The bridge connecting plugs between PRE OUT and cable POWER jacks should always be left in position in normal use If they are disconnected or removed no sound will come from the speakers Always be sure to switch off the power supply before attempting to L 5 remove them 4 4 PHONO PHONO ALEX PRE POWER AMP PIONEER CAUTION SPEAKER MPEDANCE PRE OUT POWER STEREO RECEIVER B C 4 OR MORE SPEAKER 3 1250 MODEL S C B OR MORE SPEAKER T TYPE FM ANTENNA CAUTION 00 NOT REMOVE SCREWS SEE BOT TOM NOTICE FON on ieee INT easy CONVENIENCE OUTLETS 3002 feeder 90022 Unswitched Less frequently used components which do 200W max not require coupled power can be plugged C into either of these outlets Switched A frequently used component turntable tape 50
74. plifier section The input stage is composed of Q1 amp Q2 differential amplifier with the input signal applied to Q1 Q3 amp Q4 differential amplifier comprise the second stage with Q3 output composed at Q4 by Q5 amp Q6 current mirror Connecting collector and base of Q5 produces the equivalent of a diode Q3 collector current produces a forward voltage be tween Q5 base and emitter biasing Q6 R1 and R2 in this circuit are equal while Q5 and Q6 are the same type transistors Consequently when voltages between bases and emitters of Q5 amp Q6 are equal current flows in these transistors also become equal This results in equal current flows in Q3 and Q6 Mutually opposite phase signals drive Q3 and Q4 resulting in mutually opposite phase collector currents Q4 and Q6 therefore operate as push pull Wet 12dB oct ATTEN A High filter Input B Low filter LOW FILTER switch ma O oe Input x j a 1 Output FILTER switch Fig 16 Basic circuitry of filters Power stage bias voltage is supplied by the voltage drop across D1 D2 and VR2 VR2 is a semi fixed resistor for power stage bias adjustment while D1 and D2 are Varistors for temperature compen sation 3 stage Darlington connection is employed in the power stage Q7 Q14 with output transistors Q11 QQ14 in a compleme
75. r 22 0004F 80V ACH 056 Power amplifier assembly AWH 048 Stabilizer assembly AWR 106 Tuner assembly AWE 068 Equalizer amplifier assembly AWF 021 Tuning shaft assembly AXA 111 SX 1 250 BOTTOM VIEW Ferrite balun Fuse 1A FU1 T22 025 AEK 106 Fuse 12A FUG6 primary Fuse 1A FU2 AEK 301 AEK 106 Fuse FU3 AEK 106 Power supply assembly Fuse 1A FUA AWR 107 106 Fuse 1 5 FU5 AEK 104 et B Filter amplifier assembly AWM 089 gt 4 Speakers switch assembl Function switch assembly f S V wawaka RO 7 0 0 UR 245 AWS 095 AWS 094 sg 5 1 j 3 425 U T j 5 RES ri 2 E y eS 1 y 1 Ceramic capacitor 0 01uF 150V Flat amplifier assembly ACG 003 AWG 042 Control amplifier assembly AWG 041 3a 8 5 FRONT VIEW Indicator STEREO AAT 028 Indicator SP A SP B SP C AAT 026 Push switch SPEAKERS ASG 094 Phone jack PHONES AKN 010 Lever switch POWER ASK 080 Variable resistor 102k 5 step BASS 50Hz ACV 165 Variable resistor 102 6k 11 step BASS 100Hz ACV 166 Lever switch TONE ASK 090 Variable resistor 99k 11 step TREBLE 10kHz ACV 167 Variable resistor 102k 5 step TREBLE 20kHz ACV 168 33 Lever switch TAPE MONITOR 2 A
76. r amplifier between local oscillator and mixer reduces local oscillator load eliminating distortion of the oscillation wave form Drawing effect of the local oscillator is also eliminated FM 75 O UNBAL Ist RF amp FM 300 O BAL L SX 1 250 FM IF Section Four integrated circuits ICs and four dual element ceramic filters compose this section HA1201 diagram on page 56 is a differential amplifier with a constant current source and functions as a current limiting limiter HA1137 diagram on page 55 contains IF limiter amplifier quadrature detec tor meter drive and muting circuits The detector circuit contained within this IC is not used in the 5 1250 however and instead the IF signal is taken from the stage prior to the detector and applied to TA7061AP This latter IC is a 3 stage differential amplifier diagram on page 56 and its output goes to the ratio detector for FM detection enr HET Local oscillator Buffer Fig 1 Circuitry of FM front end Fig 2 Block diagram for HA1137 T4 Multiplex Decoder The multiplex decoder contains three sections and employs an IC HA1196 with a block diagram as shown in Fig 3 see page 55 for circuit 1 Switching Signal Generator A PLL phase locked loop system is employed 76kHz is generated by the VCO voltage controlled oscilator an oscillator in which frequency is controlled by a voltage and converted into 38kHz by a freq
77. se Ratio at 65dBf 80dB STEREO 74dB Distortion at 65dBf 100Hz MONO 0 196 STEREO 0 2596 0 1 STEREO 6 0 3 STEREO 0 3 Frequency Response 30Hz to 150007 68 Capture Ratio i Vs 033390902 Yn 1 0dB Alternate Channel Selectivity cd ON 83dB Spurious Response Ratio se as ee 110dB Image Response Ratio pila ase 110dB IF 5509556 aew nauena pa CA 120dB AM Suppression Ratio ODdB Muting Threshold 13dBf 4 94 V 300 2 Stereo Separation 5008 1kHz 35dB 30Hz 15kHz Subcarrier Product Ratio 7 0 SCA Rejection Ratio 74dB Antenna Input 300 ohms balanced 75 ohms unbalanced e SX 1 250 AM Section Sensitivity IHF Ferrite antenna 300uV m UHF Ext antenna 15uV y yd iU D Lh re usse sj musuq O sue 40dB Signal to Noise 55dB Image Response Ratio 65dB IR RESPONSE aris a a Gals S E 85dB Antenna Built in Ferrite Loopstick Antenna Miscellaneous Power Requirements 120V 60Hz Power Consumption 650W UL CSA 1200W max Dimensions 556
78. st of ultra low and ultra high sub controls in addition to the conventional BASS and TREBLE main controls The signal is amplified to required level by a 2 stage FET and transistor direct coupled amplifier after which a 2 stage NFB type tone control circuit is provided The sub controls form the first stage and the main controls form the second stage of this circuit With NFB type tone controls C B feedback is applied to a single transistor amplifier Frequency response becomes variable by providing selectivity in the feedback circuit The basic circuit of this stage is shown in Fig 12 Fig 12 Basic circuitry of NFB type tone control circuit Midrange Operation The C1 and C2 reactances are considerably smaller than VR1 at frequencies above midrange effec tively shorting VR1 At frequencies below mid range C3 reactance becomes large and in effect opens the circuit Consequently the circuit be comes equivalent to that shown in Fig 13 with respect to the midrange In this figure the circuits parameters are not changed by any change in posi tion of the VR1 and VR2 sliders The NFB amount is therefore fixed and the circuit gain is also fixed without regard to VR1 and VR2 slider positions SX 1 250 Fig 13 Midrange operation of NFB type tone control circuit Low Frequency Operation The reactance of C1 and C2 increases at low fre quency to form a circuit as shown in Fig 14 This reactance increases in proportion
79. t bridge recti fier and two 22 0004 F capacitors Position lamps are lighted by DC from a regulated power supply for stable illumination Inrush Current Suppressor Circuit Ordinarily power transformer inrush current when the power supply is turned on is opposed by DC resistance of the winding and instantaneous induct ance of the air core In the toroidal power trans former used in the SX 1250 both these factors are very low Combined with the high charging current of the four 22 000uF capacitors in the secondary inrush current can reach several hundred amperes A resistors is therefore provided in series with the primary coil to suppress this inrush current to several tens of amperes This resistor becomes shorted after power transformer excitation The inrush suppressor circuit is shown in Fig 22 Sl is the POWER switch and S2 a relay contact The Microtemp is a temperature responding fuse 52 is open before power is turned on connecting the power transformer primary coil in series with R1 and the Microtemp After power has been turned on the relay operates when DC current is obtained from the rectifier closing S2 If S2 fails to close due to power supply or relay malfunction R1 heating opens the Microtemp 109 C operating temperature thus opening the primary circuit b SX 1 250 Rectifier AC Outlets Fig 22 Basic circuitry for inrush current suppressor 5 LEVEL DIAGRAM AUX T
80. the junction point of the power amplifier a command is sent to the relay drive circuit Fig 21 shows this operating principle Q3 and Q4 compose a differential amplifier When the same input is applied to both input terminals Q3 and Q4 bases no output is present However if there is a difference between the terminal inputs the difference is amplified and becomes the output between the two collectors During normal opera tion 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 the potential rises Current therefore flows through D5 18 Power amplifier Vee Fig 21 Basic circuitry for center point potential detector 4 4 POWER SUPPLY CIRCUIT All power supplied are regulated up to the power amplifier predriver stage Independent power trans former secondary windings are employed for left and right channels in the power stage Each channel is also supplied from an independen
81. tion as follow 1 With a tape deck connected to the TAPE 1 jacks REC and PLAY either playback or monitoring of a recording in progress are pos sible 2 Same as 1 above with a tape deck connected to the TAPE 2 jacks REC and PLAY For normal use leave in the OFF up positions VOLUME CONTROL AND AUDIO MUTING SWITCH The extremely high power output of the SX 1250 can be finely controlled by combining the cali brated VOLUME control and the AUDIO MUT ING switch The AUDIO MUTING switch can also be used to briefly lower the volume when changing records or tapes To operate a turntable connected to the PHONO 1 input jacks For listening to audio component tridge tape player TV sound tuner etc connected to the AUX input jacks As above for PHONO 2 jacks or for reproduction through microphones con nected to the MIC jack is on the front panel Note when the microphone is connected to the jack the turntable connected to the PHONO jacks cannot be used ADAPTOR SWITCH When employing adaptor components such as a graphic equalizer adaptor RG processor or Dolby NR adaptor depress this ADAPTOR switch to ON NAU VOLUME SPEAKER BUTTONS Three sets of speaker terminals A B and C are provided on the rear panel and the required speaker systems can be selected by depressing the SPEAKERS buttons as follows Nite eer Speaker systems A operate
82. to the frequency declines Also the NFB amount varies greatly according to 1 slider position The circuit gain at low frequencies can therefore be varied by VR1 Fig 14 Low frequency operation of NFB type tone control circuit High Frequency Operation The considerably smaller reactance of C1 and C2 at high frequency in comparison with VR1 effectively shorts VR1 to from an equivalent circuit such as that shown in Fig 15 C3 reactance decreases in the same degree that the frequency increases and the NFB amount is now mainly controlled by the VR2 slider position Consequently the gain at high frequencies can be varied by VR2 R WR R Fig 15 High frequency operation of NFB type tone control circuit 15 Tone Defeat Circuit By setting the TONE switch to OFF the above described tone control circuit becomes bypassed Filter Circuits Fig 16 These are NFB type active filters with 12dB octave slopes The circuit combines a 2 stage CR element and emitter follower Normal function of the emitter follower is provided in the passband and by 100 NFB gain becomes essentially 1 NFB is cancelled in the area of the cutoff fre quency composing a peak in the frequency re sponse This leads to improved and sharper CR filter response In the actual circuit CR elements for low and high filters both employ the same emitter follower and each can be selected ON OFF Power Amplifier Fig 17 shows the power am
83. trolytic Electrolytic Electrolytic Electrolytic Electrolytic Mylar Mylar Ceramic Ceramic 0 01 0 01 330 330 22 22 22 22 0 22 0 22 330R 330p Metallized mylar 1 4 470J 014 470J RDWPS 622 RDWPS 622 RDWPS 473JNL RD 4PS 473JNL RD PS 272 RDWPS 272J RD PS 824JNL 014 824JNL RD4PS 101 0 4 101 RD PS 134JNL RD PS 134JNL 0 4 122 RD APS 122 RDXPS 223 RD PS 223 RD PS 822 RD PS 822J RD 4PS 753JNL RD APS 753JNL RDXPS 103 RD PS 103 392 01 4 392 RDAPS 223 RD4PS 223 ACE 008 ACE 008 008 008 CKDYF 1032 500 CKDYF 1032 500 CEA 331P 63 CEA 331P 63 CSZA 220M 16 CSZA 220M 16 CSZA 220M 16 CSZA 220M 16 224J 50 224J 50 CKDYB 331K 50 CKDYB 331K 50 ACE 008 Metallized mylar 1 ACE 008 Ceramic 56p CCDSL 560K 50 Ceramic 56p CCDSL 560K 50 Electrolytic 100 CEANL 101P 10 Electrolytic CEANL 101P 10 Ceramic 68p CCDSL 680K 50 Ceramic 68p CCDSL 680K 50 Ceramic 10p CCDSL 100F 50 Ceramic 10p CCDSL 100F 50 Electrolytic CEANL 221P 16 Electrolytic CEANL 221P 16 Ceramic 0 04 CKDYF 4037 50 Ceramic 0 04 CKDYF 403Z 50 Electrolytic CEA 331P 35 Electrolytic CEA 331P 35 OTHERS Screw ABA 116 Union nut ABN 021 Washer faced nut ABN 024 SxX 1250 12 10 5P CONNECTOR ASSEMBLY AWX 062 AWG 042 No 24 TAPE 2 REC L AWG 042 No 1
84. uency divider then divided again to become 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 feedback this voltage is applied to the VCO And the oscillator signal is locked to the pilot signal This loop is termed PLL and a 38kHz switching signal synchronized to the pilot signal is obtained and employed as a switching signal 2 Automatic stereo detector With the PLL locked to the pilot signal the pilot signal and a 19kHz signal of the same phase are produced A voltage is then obtained at the phase comparator that is proportional to the pilot signal amplitude As it increases the lamp lights and the switch becomes on The switching signal is applied to the demodulator Composite signal 2 AF amp nm 8 Rch Muting out put out put signal gt NESS STE ee ee SS However if the FM muting signal is also applied to pin 12 the detector circuit becomes disabled grounded Therefore a switching signal to the demodulator is not supplied and mono reproduc tion is obtained 3 Demodulator Two differential amplifiers are employed in a switching circuit Fig 4 The composite signal is applied to the base of 08 01 Q2 are alter nately switched ON and OFF by the switching signal The composite signal amplified at Q3 is demodulated by the switching of
85. utput circuit on command from the detector circuits Muting Operation When the power supply is turned ON Q6 base is reverse biased through D6 and R19 R21 turning Q6 OFF Q7 base potential rises as C4 charges through R22 amp R23 and Q7 turns ON several seconds later The collector current of Q7 then SX 1 250 flows through the relay coil operating the relay to turn on the power amplifier output circuit The reverse bias of Q6 base from D6 amp R19 R21 dis appears when the power supply is set from ON to OFF Q6 remains ON however due to the residual power supply voltage C4 very rapidly discharges Q7 base potential drops and Q7 turns OFF The relay releases and the power amplifier output circuit turns OFF Note Q5 is normally OFF due to base bias and does not participate in the muting operation Operation by Detector Circuit Command Command from the detector circuits pass through one of D3 D4 or D5 and are applied in the form of a current flow Q5 is normally reverse biased through R14 but when a large current flows through on of these diodes Q5 base potential declines according to the voltage drop at R14 Q5 then becomes ON Q6 base potential rises and Q6 becomes ON C4 rapidly discharges and 7 base potential drops turning Q7 OFF The relay releases and the power amplifier output circuit becomes cut off o Detectors 1 Fig 19 Schematic diagram of relay driver circuit 2 Overload Detector C
86. y filter FM lowpass filter RF choke coil 2 2uH RF choke 2 218 RF choke coil 3 2 2uH RF choke 2 2uH RF choke coil 18uH RESISTORS 61 Carbon film Carbon film Carbon film Carbon film Carbon film 1201 1201 1137 7061 1138 1196 25 1312 28C945A Q 260 0 2560 0 26 0 152076 152076 152076 152076 152473 152473 152473 ATE 029 ATE 013 ATB 019 ATB 020 ATF 018 ATF 018 ATF 018 ATF 018 ATF 027 ATF 023 ATF 024 ATF 028 T24 028 T24 028 724 028 124 028 007 RD PS 101 4 104 RD PS 104 RD 4PS 471 RD1 4PS 151 Description 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 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 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 Carbon film Carbon film Carbon film RDXPS 331J RDWPS 471 014 471 RD 4PS 560J RD1 4PS 560J RDJ4PS 564 RD PS 471 RD 4PS 681 RDAPS 473 RD 4PS 103 5 472 RD 4PS 473 RD APS 102

Pioneer SX-1250 User's Manual

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