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Pioneer sx-939 User's Manual

1. SWITCHES AM 13 TONE DEFEAT S14 LOWFILTER 33 PHONO FUNCTION 15 HIGH FILTER PHONO2 SELECTOR 516 AF MUTING 55 817 SKRA 55 aux 518 SPKR 8 DUPLICATE 519 SPKRC 58 TAPE MONITOR 1 52 POWER 39 TAPE MONITOR 2 521 RELAY S10 DOLBY NA ADAPTOR 522 DIMMER 511 STEREO MONO 823 FMMUTING 12 LOUDNESS RESISTO CAPACITORS IN pF UNLESS OTHERWISE NOTED P oF NOTES SV DCVOLTAGE AT NO INPUT SIGNAL A DECURRENT AT NO INPUT SIGNAL 23 IN OHM 5 TOLERANCE UNLESS OTHERWISE NOTED K NO SWITCH 524 IS PROVIDED FOR 120 MODEL BUT CAPACITORS CS amp ARE PROVIDED 9 SIGNAL VOLTAGE NECESSARY FOR OBTAINING 98W 8 OUTPUT POWER 1 5 939 CAPACITORS IN UF UNLESS OTHERWISE NOTED p
2. 70 14 SCHEMATIC DIAGRAMS P C BOARD PATTERN AND PARTS LIST FOR 220V ONLY MODEL 14 1 Circuit Connection Diagram and Miscellaneous Parts 71 14 2 Power Supply Circuit Assembly AWR 056 76 1 SPECIFICATIONS SEMICONDUCTORS FETs 157 Transistors let DERE EUIS AMPLIFIER SECTION Continuous Power Output 20Hz 20kHz Both channels driven 1kHz Both channels driven Harmonic Distortion 20Hz 20kHz Continuous Power Output 1W 1W Power Output Intermodulation Distortion Continuous Power Output 1W 1W Power Output Power Bandwidth IHF Both channels driven Frequency Response Input Sensitivity Impedance 70W 82 80W 80W 49 75 75W 80 100W 100W 49 Less than 0 3 Less than 0 05 Less than 0 3 Less than 0 05 5 2 40 T H D 0 3 7Hz 100kHz POWER AMP IN s 1V 50k Output d C 8 A C C 49 160 FAG ARISTON 49 169 Damping Factor More than 45 Hum amp Noise IHF short circuited More than 110dB Residual Hum amp Noise 80 Pre amp Power amplifier Less than 1mV PREAMPLIFIER SECTION Input Sensitivity Impedance 1 2 2 5mV 50kQ2 PHOND OI E 2 5mV 50k22
3. it 11 1 67 Parts List of Switch Circuit Assembly AWS 069 0 RESISTORS Description Part No R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 SWITCH Symbol Carbon film 100 Carbon film 100 Carbon film 100 Carbon film 100 Carbon film 100 Carbon film 100 Carbon film 100 Carbon film 100 Carbon film 100 Carbon film 100 Carbon film 100 Description RD PM 1011 RD PM 1014 RD PM 1014 RD PM 101 RD PM 101J RD PM 1014 RD PM 1014 101 RDXPM 101 RD PM 101 RD PM 101 Part 68 Push switch function ASG 065 0 Switch Circuit Assembly SX 939 12 15 5P CONNECTOR ASSEMBLY AWX 062 0 Foil Side o o 49 50 66 ee 2 x o o oc RESISTORS AND OTHER Symbol Description Part No R1 Carbon film 390k RD PS 394J R2 Carbon film 390k RD PS 394 R3 Carbon film 100k RD PS 104J R4 Carbon film 100k RDZPS 104J Connector DIN type 5P AKP 007 0 69 13 PACKING METHOD AND PART NUMBERS SIDE PAD R OPERATING INSTRUCTIONS AHA 067 A ARB 099 0 ENGLISH ARD 065 0 FRENCH GERMAN SIDE PAD L AHA 066 A INSIDE PACKING AHC 014 A PACKING CASE AHD 212 A 4 SCHEMATIC DIAGRAMS P C BOARD PATTERN AND PARTS LIST 2SA745A FOR 220V ONLY MODEL 2685038 2SC1403A 4 1 CIRCUIT CONNECTION DIAGRAM AND MISCELLANEOUS PARTS
4. CKDYF 1032 50 67 Ceramic CCDSH 180K 50 Ceramic 1 CKDYF 1032 50 c9 Ceramic CCDSH 180K 50 Ceramic CCDSL 101K 50 Ceramic CCDSL 100F 50 Ceramic CKDYF 1032 50 Ceramic CKDYB 103K 50 Ceramic CCDLH O80F 50 Ceramic CCDLH 150K 50 Ceramic CCDCH 330K 50 Ceramic CCDCH 150K 50 Ceramic CKDYF 103Z 50 Ceramic CKDYF 1032 50 Ceramic CKDBC 4782 25 Ceramic CKDBC 4732 25 Electrolytic Y CEA 4R7P 25 Ceramic CCDSL 330K 50 Electrolytic CEA 100P 16 Electrolytic CEA R47P 50 Electrolytic CEA 100P 16 Ceramic CKDBC 4732 25 Ceramic CKDBC 4732 25 Ceramic CKDBC 4732 25 Ceramic CKDBC 4732 25 Electrolytic CEA 010P 50 Ceramic CCDSL 151K 50 Electrolytic CEA 101P 16 Electrolytic CEA 470P 16 Mylar 473K 50 Styrol 511J 50 Electrolytic CSSA R33M 25 Electrolytic CSSA 010M 10 Electrolytic CSSA R47M 25 Mylar 822J 50 Mylar COMA 822J 50 Electrolytic CEA 101P 16 Electrolytic CEA 2R2P 25 Electrolytic CEA 2R2P 25 Electrolytic CEA R47P 50 34 Tuner Assembly SX 939 Description Part No Electrolytic 0 47 CEA R47P 50 Ceramic 0 04 CKDYF 4032 50 Ceramic 8p CCDXL 080F 50 Styrol 300p COSA 301J 50 Mylar 0 01 COMA 103K 50 Ceramic 0 04 CKDYF 4032 50 Electrolytic 4 7 CEA 4R7P 25 Electrolytic 47 CEA 470P 6 Ceramic 220p CCDSL 221K 50 Ceramic 0 01 CKDYF 103Z 50 Ceramic 0 01 CKDYF 1032 50 Ceramic 0 005 CKDYF 502Z 50 Electrolytic 10 CEA 100P 16 Ceramic 0 04 CKDYF 403Z 50 Electrolytic 0 1 CSSA OR
5. 42 Equalizer Amplifier Assembly SX 939 12 5 CONTROL AMPLIFIER ASSEMBLY AWG 027 0 Ec 3 ios Er Mec E 1 10 q 2SAq25 Re 22K Re 2 2K Foil Side Rig 358 lt Any mw 51 5T m EL PCS BT Ria ua VRs a ae t fos de e 5121 Reeth SEST Rn R 8 p Ri Rai 24K 9 483 VRi b faa lik VRe b gt Res 10K SE G m Rie Se EEE Rez iE S we te 218 2 188 8 3 Rok Rawo 8 1 El ons Ey i rene E 4b 2 656 Ct 56 Am 5 23182215 E 41 El 2 us S 9 SB 20132 d 280112 2SCIB2 2501812 Wyo HIS 1 Reo 100K Y oT E 3E i ave 22 Res 100K gt Hill 4 222645 2453 gt 2 27232587 5 Q age r Run 225 1 2 25 2 DE Sell 16226710 8 28 8 2 2 p 00 00 00 OO OO 09 lt ow 254725 25 1312 GJ 000 43 Parts List of Control Amplifier Assembly AWG 027 0 CAPACITORS Description Part No Electrolytic 0 33 CSSA R33M 25 Electrolytic 0 33 CSSA R33M 25 Ceramic 56p CCDSL 560K 50 Ceramic
6. gt AM tuner FUSE to AF section te uem AC LINE 21 522 MUTING SWITCH Power transformer to Power amplifier Stabilizer amp Regurator Sua Sisa 60 2 Equalizer amplifier Protection circuit 3 sup 95 De Buffer omplifier Subtone Main tone Control_amplifier RIGHT CHANNEL LEFT CHANNEL SWITCHES 51 FUNCTION AM TONE DEFEAT 5 FM LOW FILTER 53 4 PHONO 1 HIGH FILTER 34 PHONO 2 AUDIO MUTING s SPEAKER 56 AUX a B 57 DUPLICATE Ss TAPE MONITOR 1 DIMMER 59 TAPE MONITOR 2 POWER 10 NR ADAPTOR 5 FM MUTING Sn MODE 512 LOUDNESS 5 CIRCUIT DESCRIPTION SIGNAL PATH 1 The FM broadcast signal waveform from the antenna is fed to the two dual gate MOS field effect transistor in the front end sec tion for radio frequency amplification This signal is converted into an intermediate fre quency by the dual gate MOS FET mixer stage in combination with the signal from the local oscillator 2 The intermediate frequency signal con verted within the front end section is fed to three ceramic filters and two ICs where it is tuned amplified and detected becoming a audi
7. 4T 87 R 1M Aes mom BER e 2 0 25 7265 C 041 25 Rs 510 Ras 4 7CIN B Loe Ray 12 0 7561451 0 182413 E A R4 82k 2 3 3 Rag ISK M Rer4 UN Rso 4 7 SW KSW Eq Ro 10 CIN 30 45 45 39 45V 0 060 A18W3SSV H3ldlidWv H3MOd 9 ZL SX 939 Parts List of Power Amplifier Assembly AWH 030 0 CAPACITORS Symbol Description Part No 61 c2 c3 C5 66 67 68 C9 RESISTORS Electrolytic 0 47 Electrolytic 0 47 Electrolytic 1 Electrolytic 1 Electrolytic 33 Electrolytic 33 Ceramic Ceramic Ceramic 560 Ceramic Electrolytic Electrolytic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Mylar Mylar Description CSSA R47P 25 CSSA R47P 25 CSSA 010P 25 CSSA 010P 25 CEA 330P 16 CEA 330P 16 CCDSL 101K 50 CCDSL 101K 50 CCDSL 560K 50 CCDSL 560K 50 CEA 331P 10 CEA 331P 10 CCDSL 120K 500 CCDSL 120K 500 CCDSL 181K 500 CCDSL 181K 500 CCDSL 181K 500 CCDSL 181K 500 COMA 563M 50 COMA 563M 50 Part No Carbon film 1M Carbon film 1M Carbon film 82k Carbon film 82k Carbon film 510 Carbon film 510 Carbon film 6 2k Car
8. 64 Parts List of Switch Circuit Assembly AWS 067 0 RESISTORS AND POTENTIOMETERS Description Part No SX 939 SWITCHES Carbon film 3 3k Carbon film 3 3k Variable resistor 250k HB Balance Variable resistor 250k B1 Volume RDAPS 332 RDAPS 332 ACV 135 0 ACV 134 0 Description Part No Lever switch duplicate Lever switch monitor 1 Lever switch monitor 2 Lever switch NR adaptor ASK 072 0 ASK 072 0 ASK 072 0 ASK 072 0 Switch Circuit Assembly 65 12 13 SWITCH CIRCUIT ASSEMBLY AWS 068 0 Foil Side Di 151885 oo E a 5 SEMICONDUCTORS Symbol Description D1 151885 or SIBO1 01 D2 151885 or SIBO1 01 SWITCH Description Part No Push switch dimmer FM muting ASG 064 0 66 Sx 939 12 14 SWITCH CIRCUIT ASSEMBLY AWS 069 0 PHONO gt 10 14 13 15 23 18 20 Foil Side 9 10 11 12 13 14 15 16 17 18 19 20 22 23 24 25 27 29 32 33 34 35 36 37 o 6 0 16 0 20 co 5 o 0 Fo FO FG 00 6 22 Rs 100 I ow 1 Yo 026 030 400 Rr 100 wu m Ra 100 we o we 5 e 100 D Rs 100 m esu R 100 we r3 e
9. ELTE TESTEM 220V ONLY MODEL suro age Bess POWER AMP 030 5 SWITCHES 51 13 TONE DEFEAT 14 LOW FILTER HIGH FILTER 8 AF MUTING 5 PHONO FUNCTION THONO2 SELECTOR FM MUTING IN OHM YW 8 TOLERANCE UNLESS OTHERWISE NOTED CAPACITOR IN F UNLESS OTHERWISE NOTED pF Nores SIGNAL VOLTAGE NECESSARY FOR OBTAINING 96W 8 OUTPUT POWER
10. 40001 40082 e 100 63 2501813 85 FER 5 RS one lt o lt lt o an Ann NN NNN N X81 em gt 2001 Sy Wo 31001 ty Hee iey 9 AN 9 2 mw 700 9 WE 7 v8 81 Py gt Foil Side YOSI cu Wo Ni Pr mo 76 08 824 Ab 400019 40082910 78 089 40 Sx 939 Parts List of Equalizer Amplifier Assembly AWF 013 0 CAPACITORS Description Part No Electrolytic 2 2 CSSA 2R2M 25 Electrolytic 22 CSSA 2R2M 25 Ceramic 47p CCDSL 470K 50 Ceramic 47p CCDSL 470K 50 Electrolytic 470 CEANL 471P 6 Electrolytic 470 CEANL 471P 6 Ceramic 15p CCDSL 150K 50 Ceramic 15p CCDSL 150K 50 Electrolytic 100 CEANL 101P 6 Electrolytic 100 CEANL 101P 6 Electrolytic 10 CEANL 100P 10 Electrolytic 10 CEANL 100P 10 Styrol COSA 1026 50 Styrol COSA 102G 50 Styrol COSA 282G 50 Styrol COSA 282G 50 Ceramic CCDSL 560K 50 Ceramic CCDSL 560K 50 Electrolytic CEANL 101P 25 Electrolytic CEANL 101P 25 Electrolytic CEANL 221P 16 Mylar COMA 224K 50 Mylar CQMA 272K 50 Mylar COMA 272K 50 RESISTORS Description Part No Carbon film 100k 104J Carbon film 100k 104 Carbon film 2 2k 2221 Carbon film 2 2k RD PM 222 Carbon film 100k RD PM 104J Carbon film 100k RD PM 104 Carbon film 180k RD PM 184JNL Carbon film 180k RD PM 184JNL Carbon fil
11. 0 5 0 5 0 5 RD PS 102J RD PS 273 RD PS 273J RD PS 223J RD PS 223J RD PS 392J RD PS 392 RD PS 753J RD PS 753J RD PS 271J RD PS 271 RD PS 151J RD PS 151J RD PS 151J RD PS 151J RD PS 562 RD PS 562J RN1H 4R7K RN1H 4R7K RN1H 4R7K RN1H 4R7K RN1H 4R7K RN1H 4R7K RN1H 4R7K RN1H 4R7K RT5B OR5K RT5B OR5K RT5B OR5K RT5B OR5K RT5B OR5K RT5B ORSK RT5B OR5K RT5B OR5K RD PS 101J RDZPS 101J RD PS 101 RD PS 101J RS2P 100J RS2P 100J RD PS 101 RD PS 101J RD PS 101J RD PS 101J RS1P 100J RS1P 100J RD PS 010J RD PS 010J Power Amplifier Assembly Continued on the Next Page 51 POTENTIOMETERS Description Part No Variable resistor 10k B semi fixed Variable resistor 10k B semi fixed Variable resistor 100 B semi fixed Variable resistor 100 B semi fixed SEMICONDUCTORS Description ACP 029 0 ACP 029 0 ACP 019 A ACP 019 A Part No Trafisistor 2SA726S F or Transistor 2SA726S F or Transistor 2SA726S F G Transistor 2SA726S F or G Transistor 28B527 C or D Transistor 25 527 or D Transistor 25 1451 or B Transistor 25 1451 or B Transistor 250381 L Transistor 2SD381 M or L Transistor 258536 or L Transistor 2SB536 M or L Diode 182473 Diode 152473 Diode 192473 Diode 192473 Varistor STV4H Varistor STV4H Diode 182473 Diode 182473 COILS Description Part No AF choke coil AF choke coil
12. RESISTORS Description Part No Carbon film 2 2k RD PS 222 Carbon film 2 2k RD PS 222 Carbon film 330k RD PS 334 Carbon film 330k RD PS 334 Carbon film 82k RD PS 823J Carbon film 82k RD MPS 823 Carbon film 3 9k RDW PS 392 Carbon film 3 9k RD PS 392 Carbon film 22k RD PS 223 Carbon film 22k RD PS 223 Carbon film 27k RD PS 273 Carbon film 27k RDAPS 273J Carbon film 7 10k 5 103J Carbon film 10k 5 103J Carbon film 56 RD PS 560J Carbon film 56 RD PS 560J Carbon film RD PS 104 Carbon film RD PS 104J Carbon film RD PS 473 Carbon film RDXPS 473J Carbon film RD PS 473 Carbon film RD PS 473J Carbon film RD PS 333J Carbon film RD PS 333J Carbon film RD PS 333J Carbon film RD PS 333J Carbon film RD PS 822 Carbon film RD PS 822 Carbon film RD PS 104 Carbon film RD PS 104J Carbon film RD PS 224 Carbon film RD PS 224J Carbon film RD PS 682J Carbon film RD PS 682J Carbon film RD PS 472 Continued on the Next Page 45 Control Amplifier Assembly Description Part No 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 POTENTIOMETERS Symbol 4 7k 24k 24k 24k
13. 1KHzl CAPACITORS IN UF UNLESS OTHERWISE NOTED p pF RESISTORS INQ 4W UNLESS OTHERWISE NOTED kO Miscellaneous Parts 220V only model CAPACITORS RESISTORS Description Symbol Description Part No C1 Ceramic 0 01 250V ACG 001 0 c2 Ceramic 0 01 150V ACG 004 0 63 Electrolytic 10 000 50V ACH 019 0 t4 Electrolytic 10 000 50V ACH 019 0 c5 C6 67 Ceramic 0 01 50V CKDYF 1032 50 0 01 50V CKDYF 1082 50 09 Ceramic 0 01 50V CKDYF 1032 50 Ceramic CKDYF 1032 50 Part No R1 Metal oxide Metal oxide SEMICONDUCTORS Symbol 2 7 2W 2 7k Description RS2P 272J RS2P 272J Part No o1 02 o3 04 05 06 07 08 73 Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor 2SD388P L or M 28C1403A R or Y 2503705 O or Y 2SD388P L or M 2SC1403A R or Y 2503705 8 O or Y 2SB541P L or M 28A745A R O or Y 2SB530S R or Y 2SB541P L or M 2SA745A R 0 or Y 25 5305 0 or Y 2SB541P L or M 2SA745A R 0 or Y 2SB530S R or Y 258541 or M 2SA745A R O or Y 2SB530S R 0 or Y 28D388P L or M 25 1403 or Y 2503706 or Y 2SD388P L or M 25 1403 O or Y 2SD370S R O or Y SWITCHES Description Part No OTHERS Lever switch Power Relay Description A
14. 24k 11k 11k 11k 11k 10k 10k 100k 100k 220k 220k 6 8k 6 8k 4 7k 4 7k 100k 100k 1k 1k 2 2k 2 2k 2 2k 2 2k Description RD PS 472J RD PS 243J RD PS 243 RD74PS 243J RD PS 243 RD PS 113J RD PS 113J RD PS 113J RD PS 113J RD PS 103 RD PS 103J RD PS 104 RD PS 104 RD PS 224 RD PS 224 RD PS 682 RD PS 682J RD PS 472 RD PS 472 RD PS 104J RD PS 104J RD PS 102 RD PS 102 RD PS 222 RD PS 222 RD PS 222 RD PS 2221 Part No VR1 VR2 VR3 VR4 SEMICON DUCTORS Variable resistor Bass sub Variable resistor Bass main Variable resistor Treble sub Variable resistor Treble main Description ACV 132 0 ACV 130 0 ACV 133 0 ACV 131 0 Part No Transistor Transistor Transistor Transistor Transistor 2SA725 F or G 2SA763P 5 or 6 2SA640 K or L 2SA725 F or G 25 763 5 or 6 2SA640 K or L 2SC1312 G or 25 1344 or E 25 900 or F 28C1312 G or H 128 1344 0 or E 25 900 or 25 1312 25 1344 or E 2SC900 E or F Control Amplifier Assembly Description Part No Sx 939 SWITCH Transistor 28C1312 G or 25 1344 or E 2SC900 E or F Transistor 28C1312 G or H 25C1344 D or E 2SC900 E or F Transistor 28C1312 G or 25C1344 D or E 2SC900 E or F Description Part No Lever switch Tone ASK 070 0 Control Amplifier Assembly
15. B 4 10544584 20111359 18839 1 t gs LOCAL 8 15207652 48 LOCAL 38 0 170 4 ATSWASSVY H3NnL Z 721 IquessV Jaun 86 Sv62Sc 14 15 16 17 18 eo 76 Rap M ds HAI56 Xu 9 ovo 4 7 Qu 250845 oe 982505 Ras 18K 39K own ow 9 RER 5 32 10 Rss 220K o o o 13 12 11 23 24 Rer 15K Rep 10K 100 8847 Ras 24K 0047 96 nataq 979 9 95 9 9 9 cm 0047 ry ir I 87654321 Eee EX 2 9 L x 23456 2154156 00000999 V Hanae Re 100 20 Rae 100k a TETE LOZLVH 27 28 Cay 300 E 004 212 He 1005 25046 Rs 22 owe Rr 220K ScLNSC LLLOSZ 197052 5731 6e6 xS Parts List of Tuner Assembly AWE 041 0 CAPACITORS Symbol Desc ion Part No C1 Ceramic CCDSH 150K 50 c2 Ceramic CCDSL 101K 50 c3 Ceramic CKDYF 103Z 50 Ceramic CKDYF 1032 50 c5 Ceramic CCDSL 020C 50
16. PHONO Overload Level rms p p 250mV 700mV MIC 2 0 50 0 150mV 70kQ 150mV 70kQ 150mV 70kQ TAPE PB 1 2 TAPE PB 2 DIN connector Output Level Impedance TAPE RECA 2 nme 150mV REC 2 DIN connector 30mV 80kQ PRE OUT 1V 1kQ Harmonic Distortion J uu 2272 Less than 0 1 Frequency Response PHONO RIAA equalization AUX TAPE PB Tone Control BASS MAIN SU8 TREBLE MAIN SUB Filter LOW Cut HIGH Cut Loudness Contour Volume control set at 40dB position 8dB 100Hz 4dB 10kHz Hum amp Noise IHF short circuited A Network PHONO MIO AUX TAPE PB More than 95dB 30Hz 15kHz 0 3dB 10Hz 40kHz 9 dB 8dB 50Hz 6dB oct 9dB 10kHz 6dB oct FM SECTION Usable Sensitivity IHF 1 8uV Capture Ratio IHF Selectivity IHF Signal to Noise Ratio Image Rejection 98MHz 85dB IF Rejection 98 2 100dB Spurious Rejection 100dB AM Suppression Harmonic Distortion ere Sp ris ree FOVEO RR Less than 0 296 STEREO Less than 0 4 0 2 Frequency Response 20Hz 15kHz 2 0 dB 50Hz 10kHz 9 2 dB Stereo Separation vise teen c aen on More than 40dB 50Hz 10kHz More than 30dB Sub Carrier Suppression 65dB 3009 Balanced 7502 U
17. pF RESISTORS IN UNLESS OTHERWISE NOTED M Miscellaneous Parts CAPACITORS Description Part No Ceramic 0 01 ACG 001 0 Ceramic 0 01 ACG 003 0 Ceramic 0 01 ACG 001 0 Electrolytic 10 000 ACH 019 0 Electrolytic 10 000 ACH 019 0 Mylar 0 0047 COMA 472J 50 Mylar 0 0047 COMA 472 50 Ceramic 0 01 CKDYF 1032 50 Ceramic 0 01 CKDYF 1032 50 Ceramic 0 01 CKDYF 1032 50 Ceramic 0 01 ACG 004 0 RESISTORS Symbol Description Part No R1 Carbon film 2 2M PR PS 225J R2 Metal oxide 2 7k RS2P 272J R3 Metal oxide 2 7k RS2P 272J SEMICONDUCTORS Symbol Description 01 Transistor 2SD388P L or M 2SC1403A R O or 2503705 8 or Y Transistor 2SD388P L or M 28C1403A R or Y 2503705 or Y Transistor 28B541P L or M 2SA745A R 0 or Y 2585305 8 O or Y Transistor 2SB541P L or M 2SA745A R or Y 25 5305 O or Y Transistor 2SB541P L or M 28A745A R O or Y 25 5305 0 or Y Transistor 2SB541P L or M 2SA745A R O or Y 25 5305 or Y Transistor 2SD388P L or M 2SC1403A R O or Y 2SD370S R O or Y Transistor 28D388P L or M 25 1403 O or Y 2503705 0 or Y Continued on the Next Page 29 Miscellaneous Parts SWITCHES Description Part No OTHERS Lever switch Power Lever switch Power Relay Fuse holder Fuse holder Slide switch de emphasis Description ASK 080 0 ASK 067 0 ASR 007 0
18. 007 0 AAD 082 A AKB 017 0 AKB 014 0 AKB 019 0 AKA 002 0 Miscellaneous Parts Symbol Description Part No SX 939 Binding post for ground Power transformer Power transformer Ferrite loopstick antenna Balun Fuse 5A AC power Fuse 3A AC power Pilot lamp 8V 50mA stereo indicator Pilot lamp 8V 0 3A dial scale Pilot lamp 8V 0 3A meter Pilot lamp 8V 50mA program indicator Pilot lamp 8V 50mA program indicator Fuse 1A protection Fuse 3A protection Fuse 5A protection AC socket Speaker output terminal Phone jack Headphone Phone jack Microphone Socket power transistor Jumper plug Pilot lamp socket AC cord grommet Spacer insulator Screw M4 x 15 AC power cord AC power cord Operating instructions FM T type antenna Packing case Side pad L Side pad R Inside packing AKE 012 A ATT 167 A ATT 173 0 ATB 026 0 T22 025 A AEK 021 0 AEK 101 0 AEL 014 0 E22 032 0 AEL 015 0 AEL 022 0 AEL 023 0 AEK 106 0 AEK 101 0 AEK 039 0 AKP 005 0 AKE 014 0 K72 026 0 K72 024 0 AKH 001 0 AKM 004 A AKK 002 0 AEC 079 0 AEC 076 0 ABA 010 A ADG 005 A ADG 002 A ARB 099 0 ADH 002 0 AHD 212 A AHA 066 A AHA 067 A AHC 014 A Miscellaneous Parts 31 43 AT Ly 22pH gt 21 Lg 222 Rss 47K 5 MET p Rog alk 10 mutt 1 cem PATH 20
19. 1318 0 or R Transistor 2SB507P E or D Transistor 25 720 or R Transistor 2SD313 E or D Diode SIBO1 04 Diode 5 01 04 Diode SIBO1 04 Diode 5 01 04 Diode SR3AM 8 Diode SR3AM 8 Diode SR3AM 8 Diode SR3AM 8 Diode 151885 SIBO1 01 Diode 181885 51801 01 Diode 181885 51801 01 Zener diode W2 130 Zener diode WZ 130 Zener diode WZ 140 Description Part No 58 Heat sink Heat sink small Socket transistor Spacer insulator Fuse holder ANH 117 0 ANH 207 A AKH 002 0 AEC 043 0 AKR 013 0 Power Supply Circuit Assembly 12 9 SWITCH CIRCUIT ASSEMBLY AWS 064 0 lt lt 12 1 16 14 17 SX 939 Parts List of Switch Circuit Assembly AWS 064 0 RESISTORS Description Part No Metal oxide 150 RS2PF 151J Metal oxide 150 RS2PF 151J Metal oxide 150 RS2PF 151J Metal oxide 150 RS2PF 151J SWITCH Symbol 4 Description Part No Push switch speakers ASG 061 0 60 Switch Circuit Assembly SX 939 12 10 SWITCH CIRCUIT ASSEMBLY AWS 065 0 Foil Side MONO C4 120P R210K LOUDNESS CAPACITORS Description Part No Mylar 0 056 COMA 563J 50 Mylar 0 056 COMA 563J 50 Ceramic 120p CCDSL 121K 50 Ceramic 120p CCDSL 121K 50 RESISTORS Descriptio
20. 153 Carbon film 47k 1 RD PS 473J Carbon film 47k RD PS 473J Carbon film 2 2k RDYPS 222 Carbon film 2 2k RD PS 222J Carbon film 15k RD PS 153J Carbon film 15k RD PS 153J Carbon film 82 RD PS 820 Carbon film 82 RD PS 820J Carbon film RD PS 562J Carbon film RD PS 154 Carbon film RD PS 153J Carbon film RD amp PS 153 Carbon film RD PS 683 Carbon film RD PS 123J Carbon film RD PS 153J Carbon film RD PS 222J Carbon film RD PS 683J Carbon film RD PS 220 Metal oxide RS1P 221J Carbon film RD PS 473J 54 Protection Circuit Assembly SX 939 SEMICONDUCTORS Description Part No Transistor 25 869 or D 25 857 or 25 1515 Transistor 2SC869 C B or D 25 857 or 25 1515 Transistor 250945 0 or Transistor 25 945 0 R Transistor 254733 0 or R Transistor 25 945 or Transistor 28C1384 R or 0 Diode 152472 Diode 152472 Diode 152472 Diode 152472 Diode 152472 Diode 152473 Diode 152473 Diode 192473 55 Protection Circuit Assemlby 12 8 POWER SUPPLY CIRCUIT ASSEMBLY AWR 052 0 250313 2SD313P 2SB507P 25720 25 1318 254 20 2250313 Foil Side Rr 820 a 56 SX 939 Parts List of Power Supply Circuit Assembly AWR 052 0 CAPACITORS Symbol Description Part No ci Ceramic 0 01 ACG 004 0 02 Ceramic 0 01 ACG 004 0 c3 Ceramic 0 01 ACG 0
21. 2 2 deem ee eee 75 coaxial Recording Playback cord cable DIN type FM DE EMPHASIS SWITCH In some countries the receiver is delivered with a selector switch for adjusting the FM de emphasis from 50 to 75 sec If your unit is equipped with such a switch on the rear panel and if the high sound range gives an impression of weakness move the de em phasis switch to its other posi tion L e vai 2 ocr comms L t AM FERRITE ANTENNA For comeing Lor 4 channel discrete FM adaptor For connecting P Dolby NR adaptor x FUSE PRE POWER AMP The bridge connecting plugs between PRE OUT and POWER IN jacks should always be left in position in normal use If they are disconnected or removed no e e sound will come from the speak ers Always be sure to cut the power supply before attempting to re move them RIGHT LEFT RIGHT LEFT RIGHT LEFT B SPEAKER SYSTEMS 4 BLOCK DIAGRAM 4CH MPX QUT r RF amplifier Mixer IF amplifier Detector METER s SIGNAL te Stabilizer Separation Low pass filter Sie to Tuner lt Local oscilator control amp amplifier 520 gue Pilot Lamps MPX decoder
22. 55 k 470 80 0 9 Li E 001 Ds SR3AM 140 H opo o 288501 CH 5 Da SR3AM Ce 001 1A 150 41780 0000 x Hh 63001 o 02 16 82 c 2 05 a Da 0 E 4 20 x 1A 41 63 Dis 2 Ca 001 170 0 qi 25D213P eo 27 He 100 63 001 Re 5 5 gor 180 5272 82 De SIBOL 1A Ris 27K Er 262 5 a 329 He 4 ir 200 2 0001 1063 Ds 151885 101 PW Pte 22949 Yw os a 2 aei 9 69001 210 41 50 d Kin he 5 151885 2561318 oe eum 220 Cio 001 E BEI 8 1 0 28 22076 y P ams Dn 181885 8 250313 Parts List of Power Supply Circuit Assembly AWR 056 0 CAPACITORS Description Part No SX 939 RESISTORS Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Ceramic Ceramic Electrolytic Electrolytic Electrolytic Electrolytic 0 01 0 01 0 01 0 01 0 01 0 01 0 01 0 01 0 01 0 01 47 47 Description ACG 004 0 ACG 004 0 ACG 004 0 ACG 004 0 ACG 004 0 ACG 004 0 ACG 004 0 ACG 004 0 ACG 004 0 ACG 004 0 CEA 470P 63 CEA 470P 50 ACH 038 0 ACH 038 0 CEA 101P 63 CEA 101P 63 CEA 470P 16 CEA 470P 16 CKDYF 1022 50 CKDYF 1022 50 CEA 4708 50 CEA 222P 10 CEA 2
23. 56 CCDSL 560K 50 Ceramic 56p CCDSL 560K 50 Ceramic 56p CCDSL 560K 50 Electrolytic 100 CEA 101P 10 Electrolytic 100 CEA 101P 10 Ceramic 39p CCDSL 390K 50 Ceramic 39p CCDSL 390K 50 Ceramic 5p CCDSL 0500 50 5 CCDSL 0500 50 Electrolytic 22 CSSA 2R2M 25 Electrolytic 2 2 CSSA 2R2M 25 Electrolytic 4 7 CEA 4R7P 35 Electrolytic 4 7 CEA 4R7P 35 Mylar 0 056 563J 50 Mylar 0 056 COMA 563J 50 Mylar 0 056 COMA 563J 50 Mylar 0 056 COMA 563J 50 Styrol 390p COSA 391J 50 Styrol 390p COSA 391J 50 Electrolytic 4 7 CEANL 4R7P 25 Electrolytic 4 7 CEANL 4R7P 25 Electrolytic 10 CEA 100P 16 Electrolytic 10 CEA 100P 16 Ceramic CCDSL 120K 50 Ceramic CCDSL 120K 50 Electrolytic CEA 101P 10 Electrolytic CEA 101P 10 Electrolytic CEA 4R7P 35 Electrolytic 5 CEA 4R7P 35 Mylar 183J 50 Mylar COMA 183J 50 Mylar COMA 183J 50 Mylar COMA 183J 50 Mylar COMA 222J 50 Mylar 222 50 Electrolytic 3 CEANL 4R7P 25 Electrolytic CEANL 4R7P 25 Electrolytic CEA 100P 16 Electrolytic CEA 100P 16 Ceramic CCDSL 120K 50 Ceramic CCDSL 120K 50 Electrolytic CEA 101P 10 44 Control Amplifier Assembly SX 939 Description Part No Electrolytic 100 CEA 101P 10 Electrolytic 22 CSSA 2R2M 25 Electrolytic 2 2 CSSA 2R2M 25 Electrolytic 100 CEA 101P 16 Electrolytic 100 CEA 101P 16 Electrolytic 100 CEA 101P 16 Electrolytic 100 CEA 101P 16 Ceramic 470p CKDYB 471K 50 Ceramic 470p CKDYB 471K 50
24. A Knob Dimmer FM muting AAD 082 A Coupler knob to switch AAE 007 0 Spacer push knob AEC 152 A Knob SPKR A B C AAD 064 A Knob Low cut High cut 20dB AAD 065 A Knob Function AAD 066 A Knob Mode Loudness AAD 067 A Lever switch Power ASK 080 0 Lever switch Power ASK 067 0 Phone jack Headphone K72 026 0 Shading plate AED 018 0 Dial frame AND 072 A Nut insulator AEC 085 0 Phone jack Microphone K72 024 0 Switch circuit assembly AWS 067 0 Shield cover ANH 206 0 Control amplifier assembly AWG 027 0 Shading metal ANF 249 0 23 NOTICE Any parts asterisked are subject to being not supplied Key No Descr Part No 41 Pulley AEC 153 0 42 Pulley shaft ABA 004 0 43 Rubber bracket AEB 057 A 44 Pilot lamp 8V 50mA AEL 023 0 45 Pilot lamp holder A ANG 103 0 46 Pulley held metal ANG 102 A 475 Pulley smal AEC 101 0 48 Pulley shaft M49 025 E 49 Rubber bracket AEB 057 A 50 Pilot lamp 8V 50mA AEL 022 0 54 Pilot lamp holder B ANG 104 0 52 Sub panel AND 073 B 53 Pulley shaft M49 025 E 54 Pulley small AEC 101 0 55 Shading metal ANF 249 0 56 Switch circuit assembly AWS 068 0 57 Tuning shaft assembly AXA 056 0 58 Switch circuit assembly AWS 064 0 59 Switch circuit assembly AWS 066 0 60 Switch circuit assembly AWS 069 0 61 Switch circuit assembly AWS 065 0 62 Shield cover rear ANH 208 A 63 Phono jack A 4 jacks 4 014 0 64 Phono jack 1 ja
25. ALIGNMENT PROCEDURE EUROS odo nore Ote ala 10 2 Germany Abgleichverfahren EXBEODEDIVIEWANDIBARTSTELSTE ranae o Con ER 20 12 SCHEMATIC DIAGRAMS P C BOARD PATTERNS AND PARTS LIST 12 1 Circuit Connection Diagram and Miscellaneous Parts 12 2 Tuner Assembly AWE OAT ee 12 3 Muting Circuit Assembly AWM 063 12 4 Equalizer Amplifier Assembly 013 12 5 Control Amplifier Assembly AWG 027 12 6 Power Amplifier Assembly AWH 030 12 7 Protection Circuit Assembly AWM 062 12 8 Power Supply Circuit Assembly AWR 052 12 9 Switch Circuit Assembly AWS 064 12 10 Switch Circuit Assembly AWS 065 61 12 11 Switch Circuit Assembly 5 066 3102 12 12 Switch Circuit Assembly 5 067 64 12 13 Switch Circuit Assembly AWS 068 66 12 14 Switch Circuit Assembly 5 069 67 12 15 Connector Assembly 062 22505 69 13 PACKING METHOD AND PART NUMBERS
26. lt ART 044 0 gt SERVICE MANUAL STEREO RECEIVER sx 939 KCU F GN NOTE MODEL SX 939 COMES IN THREE VaRSIONS DISTINGUISHED AS FOLLOWS Round label on rear panel Voltage Type KCU 120V only F 110V 120V 130V 220V and 240V switchable General export model GN 220V only SEMCO Sweden NEMCO Norway and DEMCO Denmark approved gt MPIONEER Sx 939 CONTENTS About 220V only model labeled GN This model whose rear panel is labeled GN circular mark operates only on 220V substantially in its circuit design from two other models When repairing this model please see the manual on page 71 and the followings which include such items as Circuit connection diagram Miscellaneous parts list Schematic diagram of power supply circuit assembly P C board pattern and its parts list Before servicing also please do not fail to check to see if the mark is labeled on the rear panel 12 ESPECIEICANIONSTE S pe rano 04 00 2 ZSSIBRONTPANEISPAGIDITIBS En 2 00 14054081 43 ern 5 Boe CONNECTION DIAGRAM v S 7 AZSBBOGK DIAGRAM ete tele Ens VER IESUS enn 9 BRRIGHROUFTIDESERIRTION 11 12 Te DIAG Ee 13 82 8 72 2 5 55 2 7 5 2 14 CDIADZGORD STRINGING so ed I DATI ERG 16 10
27. 04 0 C4 Ceramic 0 01 ACG 004 0 C5 Ceramic 0 01 ACG 004 0 66 Ceramic 0 01 ACG 004 0 67 Ceramic 0 01 ACG 004 0 68 Ceramic 0 01 ACG 004 0 c9 Ceramic 0 01 ACG 004 0 Ceramic 0 01 ACG 004 0 Electrolytic 47 CEA 470P 63 Electrolytic 47 CEA 470P 50 Electrolytic ACH 038 0 Electrolytic ACH 038 0 Electrolytic CEA 101P 63 Electrolytic CEA 101P 63 Electrolytic CEA 470P 16 Electrolytic CEA 470P 16 Ceramic CKDYF 102Z 50 Ceramic CKDYF 102Z 50 Electrolytic ji CEA 470P 50 Electrolytic CEA 222P 10 Electrolytic CEA 221P 16 Electrolytic ACH 039 0 RESISTORS Description Part No Carbon film 1 5k RD PS 152J Carbon film 1 5k RD PS 152J Carbon film 1 5k RD PS 152J Carbon film 1 5k RD PS 152J Carbon film 12k RD PS 123J Carbon film 11k RD PS 113J Carbon film 5 1k RD PS 512 Carbon film 5 1k RD PS 512J Carbon film 5 6k RD PS 562 Metal oxide 2 7k RS1P 272J Metal oxide 820 RS2P 821J Metal oxide 820 RS2P 821J Carbon film 33 RD PS 330J Carbon film 33 RD PS 330J Carbon film 10k RD PS 103J Carbon film 2 7k RD PS 272J Carbon film 150 RD PS 151 Carbon film 33 330 Carbon film 33 RD PS 330J Carbon film W RD PS 472 Carbon film RD PS 3R3J Continued on the Next Page 57 Power Supply Circuit Assembly SEMICONDUCTORS Symbol Description Part No 01 02 o3 a4 05 06 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 OTHERS Transistor 2SD313P E or D Transistor 2SC1318 Q or R Transistor 25
28. 1M 25 Ceramic 0 01 CKDYB 103K 50 Ceramic 0 01 CKDYB 103K 50 Electrolytic 220 CEA 221P 16 Tuning capacitor ACK 006 0 Ceramic trimmer C43 007 A RESISTORS Symbol Description Part No Carbon film 1M RD PS 105 Carbon film 1 8k RDAVS 182 Carbon film 5 6k 562 Carbon film 27 RDAVS 270 Carbon film 150 RDXVS 1514 Carbon film 12k RD PS 123 Carbon film 220k RDAVS 224 Carbon film 22 RD VS 220 Carbon film 150 RD PS 151J Carbon film 4 7k RD VS 472J Carbon film 10k RD VS 103 Carbon film 1k RD VS 102 Carbon film 1k RD VS 102 Carbon film 22 RD amp VS 220 Carbon film RD PS 101 Carbon film RD PS 1014 Carbon film RD PS 331 Carbon film RD PS 331 Carbon film RD PS 564 Continued on the Next Page 35 Tuner Assembly Description Part No Carbon film 330 RD PS 331 Carbon film 12k RD PS 123 Carbon film 220k RD amp VS 224 Carbon film 8 2k RD PS 822 Carbon film 330 RD PS 3314 Carbon film RD VS 242 Carbon film RD PS 163 Carbon film RD PS 222 Carbon film RD PS 473 Carbon film RD PS 104 Carbon film RD PS 562 Carbon film RD PS 562 Carbon film RD VS 153 Carbon film RD VS 332 Carbon film RD VS 100J Carbon film RD PS 100J Carbon film RD PS 104 Carbon film RD PS 100 Carbon film RD PS 100 Carbon film RD PS 332 Carbon film RD PS 332 Carbon film RD PS 182 Carbon film RD PS 182 Carbon film RD PS 183 Carbon film RD PS 183 Carbon film RD PS 3
29. 21P 16 ACH 039 0 Part No Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Metal oxide Metal oxide Metal oxide Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film 1 5k 1 5k 1 5k 1 5k 12k 11k 5 1k 5 1k 5 6k 2 7k 820 820 33 33 RDAPS 152 RD PS 152 5 152 RD PS 152 RDAPS 123 RDXPS 113 RD PS 512 RD PS 512 RD PS 562 RS1P 272 RS2P 821 RS2P 821 RD PS 330J RD PS 330 RD PS 103J RD PS 272J RD PS 151 RD PS 330 RD PS 330J RD PS 472 RD PS 383 Power Supply Circuit Assembly SEMICONDUCTORS Description Part No OTHERS Transistor 2SD313P E or D Transistor 25 1318 0 R Transistor 25 1318 0 or R Transistor 2SB507P E or D Transistor 25 720 or R Transistor 250313 or D Diode 51801 04 Diode 51801 04 Diode 51801 04 Diode 5 801 04 Diode SR3AM 8 Diode SR3AM 8 Diode SR3AM 8 Diode SR3AM 8 Diode 181885 51801 01 Diode 151885 51801 01 Diode 151885 51801 01 Zener diode WZ 130 Zener diode WZ 130 Zener diode WZ 140 Description Part No 78 Heat sink Heat sink small Socket transistor Spacer insulator Fuse holder ANH 117 0 ANH 207 A AKH 002 0 AEC 043 0 AKR 010 0 Power Supply Circuit Assembly 5 10 2 ABGLEICHVERAHREN GERMANY ABG
30. 65 A AAD 066 A AAD 067 A AAE 007 0 AAD 082 A AKB 017 0 AKB 014 0 AKB 019 0 AKA 002 0 AKE 012 A ATT 180 A Description Part No SX 939 Ferrite loopstick antenna Balun Fuse 3 15A protection Fuse 1A protection Pilot lamp 8V 0 3A dial scale Pilot lamp 8V 0 3A meter Pilot lamp 8V 50mA program indicator Pilot lamp 8V 50mA program indicator Connector AC power Speaker output terminal Phone jack Headphone Phone jack Microphone Socket power transistor Jumper plug Pilot lamp socket Fuse holder protection AC cord grommet Spacer insulator Screw M4 x 15 Operating instructions English Operating instructions French German FM T type antenna Packing case Side pad L Side pad R Inside packing ATB 026 0 T22 025 A AEK 042 0 E21 031 0 E22 032 0 AEL 015 0 AEL 022 0 AEL 024 0 AKP 008 0 AKE 014 0 K72 026 0 K72 024 0 AKH 001 0 AKM 004 A AKK 002 0 K91 008 0 AEC 079 0 AEC 076 0 ABA 010 A ARB 099 0 ARD 065 0 ADH 002 0 AHD 212 A AHA 066 A AHA 067 A AHC 014 A 75 14 2 POWER SUPPLY CIRCUIT ASSEMBLY AWR 056 0 250313 2SD313P 2SB507P 0 250313 Ry 820 O H Ris 33 Ry 150 Q 2SA720 28C 1318 D Qs 254720 0 280313 220 16 220 10 1000 35 Foil Side R12 820 Cp 001 06 SRAM 120 Kae o 1 3 Dr SR3AM Cs 001 On n 130 9 Qa
31. 92 Carbon film RD PS 392 Carbon film RD PS 392 Carbon film RD PS 392 Carbon film RD PS 122 Carbon film RD PS 122 Carbon film RDXPS 224 Carbon film RD PS 224 Carbon film RD PS 470 Carbon film RD PS 473 Carbon film RD PS 473 Carbon film RD PS 332 Carbon film RD PS 223 Carbon film RD PS 681J Carbon film RD PS 102 Carbon film RD PS 222 Carbon film RD PS 101 Carbon film RD PS 470 Carbon film RD PS 153 Carbon film RD PS 103J 36 Tuner Assembly SX 939 POTENTIOMETERS Description Part No Variable resistor 4 7k B Semi fixed C92 055 0 Variable resistor 330k B Semi fixed ACP 042 0 Variable resistor 50k B Semi fixed ACP 043 0 Variable resistor 47k B Semi fixed C92 048 0 Variable resistor 2 2k B Semi fixed ACP 001 0 SEMICONDUCTORS Description FET 3SK45 B RET 3SK45 B Transistor 25 717 Transistor 25 461 1201 1137 1138 HA1156 Transistor 25 945 R or S Transistor 2SA763P 6 or 5 2SA725 F or G Transistor 2SA763P 6 or 5 2SA725 F or G Transistor 25 945 0 or 5 Transistor 25 945 or 5 Diode 182076 Diode 152076 COILS FILTERS AND TRANSFORMERS Symbol Description Part No 11 FM antenna coil ATC 021 0 T2 FM RF coil ATC 015 0 T3 FM RF coil ATC 016 0 14 FM OSC coil ATC 022 0 TS FM matching transformer ATE 008 0 16 FM IF transformer T73 035 A 2150 AM RF coil ATB 014 0 18 AM OSC coil ATB 013 0 F1
32. 939 and an 80 dummy resistor should be connected across the speaker terminals A DC millivolt meter should be connected across between terminal number 10 25 and earth Adjustment should be made to bring the voltage to zero The DC voltmeter should be connected between terminals number 50 38 and 44 32 Adjustment should be made to bring the voltage to 50mV 11 EXPLODED VIEW AND PARTS LIST Parts number is subject to change for the purpose of improvement with notice of a service bulletin Service bulletin will be furnished whenever necessary and you are requested to amend parts number in this manual according to the instructions Parts List of Exploded View 1 NOTICE Any parts asterisked are subject to being not supplied Description Part No Power transformer ATT 167 A Power transformer ATT 173 0 Power transformer ATT 180 A Power transformer held metal ANF 248 0 Electrolytic capacitor 10 000uF 50 ACH 019 0 Foot AEC 027 B Bottom plate ANE 055 B Heat sink held metal ANF 231 0 Heat sink ANH 215 A Heat sink held metal ANF 232 0 Muting circuit assembly AWM 063 0 P C board holder AEB 019 0 Varistor STV4H Screw M4 x 15 ABA 010 A Washer B21 011 0 Wooden cabinet 035 Power amplifier assembly AWH 030 0 Terminal strip 2P AKC 015 0 Ground terminal strip 4P K13 047 0 Wire clip C AEC 007 0 Ground terminal strip 2P K13 048 0 Wire clip A AE
33. AKR 012 0 AKR 001 0 ASH 008 0 Part No 30 Tuner assembly Power amplifier assembly Control amplifier assembly Equalizer amplifier assembly Protection circuit assembly Power supply circuit assembly Switch circuit assembly function Switch circuit assembly speakers Switch circuit assembly mode loudness Switch circuit assembly filters Switch circuit assembly tape monitor Switch circuit assembly dimmer Lamp board assembly 5P connector assembly Muting circuit assembly Front panel assembly Wooden cabinet assembly Foot Tuning shaft assembly Tuning pulley assembly Ferrite antenna holder assembly Dial pointer assembly Dial scale Meter Tuning and Signal Knob Tuning Knob Bass main Treble main Volume Balance Knob Bass sub Treble sub Knob Power Tone Duplicate Monitor 4 CH adaptor Knob SPKR A B C Knob Low cut High cut 20dB Knob Function Knob Mode Loudness Coupler Knob to switch Knob Dimmer FM muting Phono jack B 6 jacks Phono jack A 4 jacks Phono jack 1 jack Antenna terminal board AWE 041 0 AWH 030 0 AWG 027 0 AWF 013 0 AWM 062 0 AWR 052 0 AWS 069 0 AWS 064 0 AWS 065 0 AWS 066 0 AWS 067 0 AWS 068 0 AWX 069 0 AWX 062 0 AWM 063 0 ANB 260 B AMM 035 A AEC 027 B AXA 056 0 AXA 015 A AXB 001 A AAF 031 A AAG 074 A AAW 029 0 AAA 026 A AAB 068 A AAB 069 B AAD 040 0 AAD 064 A AAD 065 A AAD 066 A AAD 067 A AAE
34. C 004 0 Chassis ANA 068 B Wire clip AEC 064 0 Power supply circuit assembly AWR 052 0 Power supply circuit assembly AWR 056 0 Relay ASR 007 0 Protection circuit assembly AWM 062 0 Equalizer amplifier assembly AWF 013 0 Shield cover ANF 240 A Tuner assembly AWE 041 0 Tuning pulley assembly AXA 015 A P C board held metal A ANF 246 A P C board held metal B ANF 247 A 20 NOTE Parts number is subject to change for the purpose of improvement with notice of a service bulletin Service bulletin will be furnished whenever necessary and you are requested to amend parts number in this manual according to the instructions NOTICE Any parts asterisked are subject to being not supplied Description Part No Dial scale AAG 074 A Dial scale held metal ANF 243 A Dial pointer assembly AAF 031 A Lamp holder ANG 097 0 Pilot lamp socket AKK 002 0 Pilot lamp 8V 0 3A meter AEL 015 0 Lamp box B ANH 211 B Meter Tuning amp Signal AAW 029 0 P C board cover ANG 100 0 Lamp board assembly AWX 069 0 Pilot lamp 8V 0 3A dial scale E22 032 0 Lamp box A ANH 210 A Rubber bracket AEB 031 0 Pilot lamp 8V 50mA AEL 014 0 Front panel assembly ANB 260 B Knob Power Tone Duplicate Monitor 4 CH adaptor AAD 040 0 Knob Treble subl AAB 069 B Knob Treble main AAB 068 A Knob Bass main Volume Balance AAB 068 A Knob Bass sub AAB 069 B Knob Tuning AAA 026 A Ornamental ring AAC 034
35. EAT SINK ELECTROLYTIC CAPACITOR 10 000 50V ACH 019 0 SPEAKER OUTPUT POWER TERMINAL TRANSFORMER AKE 014 0 167 ATT 173 0 F KNOB POWER TONE MUTING CIRCUIT DUPLICATE MONITOR PHONO JACK A 4 JACKS ASSEMBLY 4 CH ADAPTOR AKB 014 0 AWM 063 0 AAD 040 0 14 BOTTOM VIEW ANTENNA CLAMPER 4 AEC 154 0 FUSE HOLDER AKR 012 0 KCU AKR 001 0 F ASSEMBLY AWR 052 0 POWER SUPPLY CIRCUIT KNOB TREBLE SUB BASS SUB AAB 069 B CONTROL AMPLIFIER ASSEMBLY AWG 027 0 LEVER SWITCH POWER ASK 080 0 KCU ASK 067 0 F Eo o ASSEMBLY AWM 062 0 FERRITE ANTENNA HOLDER ASSEMBLY AXB 001 A FERRITE LOOPSTICK ANTENNA ATB 026 0 PROTECTION CIRCUI EQUALIZER AMPLIFIER ASSEMBLY AWF 013 0 SWITCH CIRCUIT ASSEMBLY AWS 067 0 KNOB TREBLE MAIN BASS MAIN VOLUME BALANCE AAB 068 A SX 939 9 DIAL CORD STRINGING 1 Turn the tuning capacitor so that its plates protrude as much as possible 2 Tie one end of the string to the spring on the TUNING pulley attached to the tuning capacitor 3 Lead the string around pulley A then wind it three turns around the TUNING shaft 4 Lead the string around pulleys B C and D then wind it 1 1 2 turns around the TUN ING pulley 5 Now tie the other end of the string to the spring on the TUNING pulley Turn the TUNING shaft and check for prop
36. FM ceramic filter ATF 013 B F2 FM ceramic filter ATF 013 B F3 FM ceramic filter ATF 013 B F4 AM ceramic filter ATF 009 0 F5 Low pass filter ATF 019 0 L1 Choke coil ATH 007 0 L2 RF choke coil T24 028 A L3 RF choke coil T24 028 A L4 RF choke coil T24 028 A L5 RF choke coil T24 028 A 37 Tuner Assembly 12 3 MUTING CIRCUIT ASSEMBLY 063 0 38 gt Q3 25 30 Ru IM C2 Cy 0475 5 045 o 2SK30A Foil Side R7 220K 1 152076 t Rs 22K Re 220K Rig 10K R3 330 ee o 81 256945 3 Ri 47K 25 945 SX 939 Parts List of Muting Circuit Assembly AWM 063 0 CAPACITORS Description Part No Electrolytic 4 7 CEA 4R7P 25 Electrolytic 4 7 CEA 4R7P 25 Electrolytic 1 CSSA 010M 25 RESISTORS Symbol Description Part No R1 Carbon film 47k RDUPS 473J R2 Carbon film 22k RDAPS 223J R3 Carbon film 330 RD PS 331J R4 Carbon film 22k RD PS 223J R5 Carbon film 22k RD PS 223J R6 R7 Carbon film RD PS 224J R8 Carbon film RD PS 224J R9 Carbon film RD PS 224J R10 Carbon film RD PS 224J R11 Carbon film RD PS 105J R12 Carbon film RD PS 4721 R13 Carbon film RD PS 103 SEMICONDUCTORS Symbol Description Part No 01 Transistor 25 945 0 02 o3 FET 2SK30A Y D1 Diode 1S2076 39 Muting Circuit Assembly 12 4 EQUALIZER AMPLIFIER ASSEMBLY AWF 013 0 ew 099 oy 528
37. LEICHEN DES FM TEILS 12 Der Ausgang des FM Priifsenders ist moduliert bei 400 Hz bei einer Abweichung Der obere Kern ist zu drehen und so einzustellen da die Verzerrung minimal Der Ausgangspegel des FM Pr fsenders ist moduliert bei 400 Hz bei einer Es ist auf maximalen Ausgang bei 87 4 MHz einzustellen 10 11 12 Regeleinstellungen am SX 939 Die Steuerelemente Kn pfe und Schalter des SX 939 sind wie folgt einzustellen POWER Stromzuf hrung ON Ein FUNCTION Funktion FM FM MUTING FM D mpfung OFF Aus Schaltungen zwischen Pr fsatz und dem SX 939 e Der Ausgang von einem FM Pr fsender ist mit den 300 Ohm Antennenanschl ssen des SX 939 zu verbinden e Ein Klirrfaktorme ger t ist mit den Anschlu buchsen des SX 939 REC Band aufnahme zu verbinden e Ein Millivolt Wechselspannungsmesser ist parallel zum Klirrfaktorme ger t mit den Anschlu buchsen TAPE REC Band aufnahme des SX 939 zu verbinden Der FM Pr fsender und der SX 939 sind beide auf eine Anzeige von 98 MHz einzustellen Der Ausgangspegel des FM Pr fsenders ist auf minimale Einstellung herunterzudrehen Der untere Kern ist zu drehen und so einzustellen daf die Nadel des Abstimm Meters zentriert ist 5 von 75 kHz auf 60 dB zu erh hen wird Obige Schritte 4 7 sollen mehrmals nacheinander wiederholt werden bis keine merkliche Verbesserung erzielt wi
38. M signal generator output to minimum Adjust for a stationary Lissajous waveform on the oscilloscope Reset the FM signal generator to 60dB level output and modulate either the L or R channel Adjust for the maximum separation 18 SX 939 ALIGNING THE AM SECTION 1 no Adjust for maximum output with the frequency set at 1 400kHz Connect the AM signal generator directly to the AM ANT antenna terminals With a frequency of 1 400kHz and an AM signal output of 36dB i foralow SX 939 Control Settings Set the controls knob and switch of the SX 939 as follows POWER ON FUNCTION AM Connections between Test Equipment and the SX 939 e Connect the AM signal generator to the AM antenna terminals in series with a 1 dummy resistor e Connect the AC millivolt meter to the TAPE REC terminal jacks Set the AM signal generator to 3076 modulation at 400Hz Set the AM signal generator output to 30dB at 600kHz Adjust for maximum output Carry out the ferrite loopstick antenna core adjustment at the same time Adjustments 4 5 above should be repeated several times until no further significant improve ment is obtained frequency output of 70mV With an AM signal generator output of 80dB adjust for a low frequency output of 310mV ALIGNING THE POWER AMPLIFIER SECTION Nothing should be connected to the input jacks of the SX
39. OTHERS Symbol Description T63 009 0 T63 009 0 Part No Heat sink 52 ANH 203 0 Power Amplifier Assembly sx 939 12 7 PROTECTION CIRCUIT ASSEMBLY 062 0 88 AG 75V gt 9 795 yee w 25 1384 2 250945 6 1 1 I 1 1 1 1 1 l TSI ta 1 1 1 1 1 1 I 1 1 L 1 PE 211281 a 4 P T abe 2 e Wo 2v28l gt wel T lt gt au Ss am R g 5 EO 23 9 N e 5 39 ely 14 gt We 217251 50 a Wo nws 2 MOS Sy 9 ANv e 89 2 Ly 9 AN e SL 02 ML 022 924 E 22 3 5 91 001 8 819251 80 25 869 53 Parts List of Protection Circuit Assembly AWM 062 0 CAPACITORS Symbol Description Part No C1 Electrolytic 0 22 CSSA R22M 10 c2 Electrolytic 0 22 CSSA R22M 10 c3 Electrolytic 330 CEA 331P 6 64 Electrolytic 330 CEA 331P 6 C5 Electrolytic 47 CEA 4R7P 25 c6 Electrolytic CEA 101P 16 RESISTORS Description Part No Carbon film 1 3k RD PS 132J Carbon film 1 3k RD PS 132J Carbon film 1 3k RD PS 182 Carbon film 1 3k RD PS 132J Carbon film 15k RD PS 153J Carbon film 15k RD PS 153 Carbon film 15k RD PS 153J Carbon film 15k RD PS
40. SK 068 0 ASR 007 0 Part No 74 Tuner assembly Power amplifier assembly Control amplifier assembly Equalizer amplifier assembly Protection circuit assembly Power supply circuit assembly Switch circuit assembly function Switch circuit assembly speakers Switch circuit assembly mode loudness Switch circuit assembly filters Switch circuit assembly tape monitor Switch circuit assembly dimmer Lamp board assembly 5P connector assembly Muting circuit assembly Front panel assembly Wooden cabinet assembly Foot Tuning shaft assembly Tuning pulley assembly Ferrite antenna holder assembly Dial pointer assembly Dial scale Meter Tuning and Signal Knob Tuning Knob Bass main Treble main Volume Balance Knob Bass sub Treble sub Knob Power Tone Duplicate Monitor 4 CH adaptor Knob Speaker A B C Knob Low cut High cut 20dB Knob Function Knob Mode Loudness Coupler knob to switch Knob Dimmer FM muting Phono jack B 6 jacks Phono jack A 4 jacks Phono jack 1 jack Antenna terminal board Binding post for ground Power transformer AWE 041 A AWH 030 0 AWG 027 0 AWF 013 0 AWM 062 0 AWR 056 0 AWS 069 0 AWS 064 0 AWS 065 0 AWS 066 0 AWS 067 0 AWS 068 0 AWX 069 0 AWX 062 0 AWM 063 0 ANB 260 B AMM 035 B AEC 027 B AXA 056 0 AXA 015 A AXB 001 B AAF 031 A AAG 074 A AAW 029 0 AAA 026 A AAB 068 A AAB 069 B AAD 040 0 AAD 064 A AAD 0
41. bon film 6 2k Carbon film 56k Carbon film 56k Carbon film 9 1k Carbon film 9 1k Carbon film 100k Carbon film 100k Carbon film 2 2k Carbon film 2 2k Carbon film 68k Carbon film 68k Carbon film 390k Carbon film 390k Carbon film 3 9k Carbon film 3 9k Carbon film 110k Carbon film 110k Carbon film 1k RD PS 105J RD PS 105J RDAPS 823J RD PS 823J RD PS 511J RD PS 511 RD PS 822 RDX PS 622J RD PS 563 RD PS 563 RD 4PS 912 RD PS 912 RD PS 104 RD PS 104 RD MPS 222 RD PS 222 RD PS 683 RD PS 683J RD PS 394J RD PS 394 RD PS 392 RD PS 392 RD PS 114 RD PS 114 RD PS 102 Power Amplifier Assembly Description Part No Sx 939 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 film Metal film Metal film Metal film Metal film Metal film Metal film Metal film Wire wound Wire wound Wire wound Wire wound Wire wound Wire wound Wire wound Wire wound Carbon film Carbon film Carbon film Carbon film Metal oxide Metal oxide Carbon film Carbon film Carbon film Carbon film Metal oxide Metal oxide Carbon film Carbon film 1k 27k 27k 22k 22k 3 9k 3 9k 75k 75k 270 270 150 150 150 150 5 6k 5 6k 4 7 4 7 4 7 47 4 7 4 7 4 7 4 7 0 5 0 5 0 5 0 5 0 5
42. ck AKB 019 0 65 Phono jack A 4 jacks AKB 014 0 66 Speaker output terminal AKE 014 0 67 AC socket AKP 005 0 KCU F 68 5P connector assembly AWX 062 0 69 Fuse holder AKR 012 0 KCU Fuse holder AKR 001 0 70 Phono jack A 4 jacks AKB 014 0 71 Phono jack A 4 jacks AKB 014 0 72 Phono jack B 6 jacks AKB 017 0 73 Antenna terminal board AKA 002 0 74 Rear panel ANC 107 B KCU Rear panel ANC 112 A F Rear panel ANC 114 0 GN 75 AC cord grommet AEC 079 0 KCU Connector AC power AKP 008 0 GN 76 AC power cord ADG 005 A KCU AC power cord ADG 002 A F 275 Model name plate AAL 180 A KCU Model name plate AAL 201 0 F 78 Binding post for ground AKE 012 A 79 Ferrite loopstick antenna ATB 026 0 80 Ferrite antenna holder assembly AXB 001 A 81 Antenna clamper AEC 154 0 82 AC cord grommet AEC 079 0 24 2 SCHEMATIC DIAGRAMS P C BOARD AND PARTS LIST 2 1 CIRCUIT CONNECTION DIAGRAM AND MISCELLANEOUS PARTS 2SA745A 2SB530S 2SB541P 2SC1403A 2SD370S 2SD388P 120 ONLY MODEL AND 5 LINE VOLTAGE MODEL TUNER AWE 041 LAMP assy AWX URS LET
43. d at the same time is not possible Only when listening through headphones press again the SPKR button s in use to OFF undepressed from the ON position pressed POWER SWITCH Turn this switch ON but wait for some 3 to 6 seconds during the silence of which the protection circuit climi nates the unpleasant noise not imputed to a receiver fault PHONES 1 2 OUTPUT JACKS Accept two pairs of headphones BASS CONTROLS Adjust bass tone quality 10082 4 4 5 For the low frequencies below 400Hz Possible up to 1048 of increasing or reducing at 100Hz in 2dB steps After adjustment by the 100Hz control further adjust frequencies below 80Hz by this control if necessary Possible up to 5dB of increasing or reducing in bass response at 50 2 in 2 5dB steps LOW CUT HIGH CUT BUTTONS LOW When the low pitched rumble turntable motor or other source is obtrusive de press the LOW CUT button to ON In no interference leave it undepressed OFF HIGH When the high frequency scratch noise records or other source is much depress this button to ON In no interference leave it undepressed OFF TONE SWITCH When in the ON up position this switch causes the section to operate with a flat frequency regard less of the tone control settings Use this switch to check the audio characteristics of your listening room such as when it is necessary to check the tone quality of phono cartridg
44. en mit Umschaltm glichkeit von den Kan len LH auf RH zu verbinden 3 Modulation des Multiplex Pr fsenders L R 1 kHz Abweichung von 67 5 kHz PILOT 19 kHz Abweichung von 7 5 kHz Der Ausgang des FM Priifsenders ist auf minimales Niveau einzustellen Am Oszilloskop ist eine Einstellung auf eine stehende Wellenform der Lissajousschen Figur durchzuf hren 6 Der FM Pr fsender ist auf einen Pegelausgang von 60 dB und entweder der LH oder der RH Kanal zu modulieren 7 Es ist auf maximale Trennung einzustellen am 80 SxX 939 ABGLEICHEN DES AM TEILS 1 gt Es ist der maximale Ausgang bei einer Frequenzeinstellung auf 1400 kHz Der AM Pr fsender ist direkt mit den Anschl ssen AM ANT Antenne zu Bei einer Frequenz von 1400 kHz und einem Ausgang des AM Pr fsenders von Bei einem Ausgang des AM Pr fsenders von 80 dB ist eine Einstellung auf einen Regeleinstellungen am SX 939 Die Steuerelemente Kn pfe und Schalter des SX 939 sind wie folgt einzustellen POWER Stromzuf hrung ON Ein FUNCTION Funktion AM Schaltungen zwischen Pr fsatz und dem SX 939 e Der AM Pr fsender ist mit den AM Antennenanschl ssen in Reihenschaltung mit einem k nstlichen Widerstand von 1 k 2 zu verbinden Der Millivolt Wechselspannungsmesser ist mit den AnschluBbuchsen TAPE REC Band aufnahme zu verbinden Der AM Pr fsender ist auf eine Modulation von 30 bei 400 Hz einz
45. er func tion Then trim the ends of the string 6 Turn the TUNING shaft until the plates of the variable are all the way in Move the pointer to the left end starting point on the dial and fasten it to the string in that position PULLEY D PULLEY 16 10 ALIGNMENT PROCEDURE 10 1 ENGLISH ALIGNING THE FM SECTION 1 x 10 11 12 17 Turn the upper core and adjust so that the distortion is at a minimum Adjust for maximum output at 90MHz SX 939 Control Settings Set the controls knob and switches of the SX 939 as follows POWER ON FUCTION FM FM MUTING OFF Connections between Test Equipment and the SX 939 e The output from an FM signal generator should be connected to the 8009 antenna terminals of the SX 939 distortion meter should be connected to the TAPE REC terminal jacks on the SX 939 e An AC millivolt meter should be connected to the TAPE REC terminal jacks on the SX 939 in parallel with the distortion meter Set both the FM signal generator and the SX 939 to indicate 98MHz Turn the FM signal generator output level down to minimum Turn the lower core and adjust so that the TUNING meter needle is centered Increase the FM signal generator output to 60dB modulated at 400Hz with a deviation of 75 kHz Steps 4 7 above should be repeated several times in succession until no significant improve ment is obtained Set the FM signal gene
46. es and speakers and also to particularly set the tone controls to be assessed SIGNAL METER For AM and FM station tuning AM tuning Tune the dial pointer so that the SIGNAL meter needle comes to the extreme right FM tuning Both the SIGNAL 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 meter FM TUNING METER While getting the SIGNAL meter needle going to the right make fine adjustment with the FM TUNING meter whose needle comes to the center indicating the optimum reception FM STEREO INDICATOR TUNING KNOB TREBLE CONTROLS Adjust treble tone quality 10KHz For the high frequencies above 2 5 kHz Possible up to 10dB of increasing or reducing in treble response at 10 2 in 2dB steps WEH After adjustment by the 10KHz control further adjust frequencies above 12k Hz by this control if necessary Possible up to 5dB of increasing or reducing in treble response at 20k Hz in 2 5dB steps AUDIO MUTING BUTTON 20dB Depress this button to mute the audio input to 20dB No need to turn down the VOLUME control on each occasion for your convenience TAPE DUPLICATE SWITCH Leave this switch in the ON down position to duplicate or cdit a recorded tape using two tape decks For normal use switch over to the OFF up position BALANCE CONTROI Adiusts the bala
47. fier section of the twin control has closed loop NFB amplifiers for both the main and sub circuits each of which has its own transistor eliminating mutual inter ference The control amplifier output is fed to the power amplifier after passing through the LOW FILTER HIGH FILTER and AUDIO MUTING circuits The first stage of the power amplifier is a differential amplifier element and the second stage uses a constant current load circuit so that DC potential drift is pre vented On the other hand the final output stage uses two power transistors in parallel in both the upper and lower circuits so that large collector dissipation is possible The power amplifier output is fed to the three push buttons which form the SPEAKER switch This selects A B and C speaker system terminal connection If all three speaker systems were to be connected simultaneously the effective speaker impedance might be less than 40 To guard against this possibility when all three buttons are depressed together all three systems are disconnected from the amplifier The protection circuit which guards against DC potentials at the power amplifier output junctions against speaker complex load im 11 pedances less than 49 and shorts across the speaker terminals Their operation is such that under the corresponding abnormal con dition a relay acts to separate the output junction and the output circuit Further this protection circuit also
48. helps to mute the unwanted signal which immediately follows switching the POWER switch ON and to immediately disconnect the output after switched OFF 6 LEVEL DIAGRAM AUX PHONO 7 MIC I EQUALIZER CONTROL AMP 2 AMP 21 2 ao a gt Low 8 HIGH FILTER SPEAKERS POWER AMP HEADPHONES 1 1 30 SPEAKERS 28V 80 98W 1 1 1 I l 1 0 dBV 1V HEADPHONES 15V dBV IN LEVEL 60 FREQUENCY AT kHz 12 SX 939 7 DISASSEMBLY 1 To remove the wooden cabinet first remove the two screws holding each side then lift the back of the wooden cabinet upward Pull off all knobs Remove the two screws in the upper edge of the front panel and remove two nuts and washers Then pull the panel gently forward 4 To remove the bottom plate first remove the ten screws holding it in place to WOODEN CABINET d BOTTOM PLATE 44 13 8 PARTS AND P C BOARD LOCATIONS TOP VIEW PHONO JACK 8 6 JACKS TUNER ASSEMBLY FRONT PANEL KNOB TUNING AKB 017 0 AWE 041 0 ASSEMBLY 026 260 8 POWER AMPLIFIER ASSEMBLY TUNING SHAFT AWH 030 0 ASSEMBLY AXA 056 0 ANTENNA TERMINAL BOARD TUNING PULLEY AKA 002 0 ASSEMBLY AXA 015 A H
49. lied to the MIC and PHONO terminal jacks are selected by the FUNCTION switch before being fed to the first stage of the three stage differential direct coupled equalizer amplifier by which the signals are amplified In order to reduce the switch noise the circuit configuration employed enables the potential at the input and output terminals to be set at near zero volts 10 alls 12 SX 939 It incorporates an independent differential circuit in the first stage of the equalizer amplifier whose DC supply uses twin plus and minus The output from the equalizer amplifier together with that from the AUX terminal jacks the audio signal from the AM tuner and the audio signal from the FM tuner are all selected by the FUNCTION switch and pass through the switch circuit for TAPE DUPLICATE TAPE MONITOR DOLBY NR ADAPTOR and the circuits for BALANCE and VOLUME controls before being fed to the control amplifier The control amplifier has an extremely high input impedance using PNP and NPN tran sistors in a two stage direct coupled circuit This greatly reduces the influence of the performance inherent in equipment con nected externally The output from this two stage direct coupled circuit is divided into two circuit systems One goes to the TONE switch via the twin tone control circuit and the other goes directly and unmodified in any way to the TONE switch The TONE switch selects between them The ampli
50. m 33k RD PM 333 Carbon film 33k 333J Carbon film 1k RD PM 102 Carbon film 1k 102J Carbon film 1 2M 125 Carbon film 1 2M RD PS 125 Carbon film 22k RD PM 223J Carbon film 22k RD PM 223J Carbon film 680 681 Carbon film 680 RD PM 6811 Carbon film 4 7k RD PM 472 Carbon film 4 7k 4721 Continued on the Next Page 41 Equalizer Amplifier Assembly Symbol Description Part No Carbon film 82k RD PM 8237 Carbon film 82k RD PM 823 Carbon film 1 8k RD PS 182 Carbon film 1 8k RD PS 182 Carbon film 1 5k RD PM 1521 Carbon film 1 5k RD PM 152 Metal film 82 5k RN SR 8252F Metal film 82 5k RN SR 8252F Carbon film 150k RD PM 154J Carbon film 150k 154J Carbon film 3 3k RD PM 332 Carbon film 3 9k RD PM 392 Carbon film 3 9k RD PM 392 Carbon film 3 9k RD PM 392 SEMICONDUCTORS Description Part No Transistor 2SA725 G or F 2SA763P 5 or 6 25 640 L or Transistor 2A725 G or F 25 763 5 or 6 25 640 L or M Transistor 2A725 G or F 28A 763P 5 or 6 25 640 L or M Transistor 2A725 G or F 2SA763P 5 or 6 2SA640 K L or M Transistor 28C1313 G or F 25 1345 or D 25 1222 E or 0 Transistor 28C1313 G or F 25 1345 or D 25 1222 E or U Transistor 28C1313 G or F 3 2SC1345 E or D 2SC1222 F E or U Transistor 28C1313 G or F 25 1345 or D 25 1222 E or
51. n Part No Carbon film 10k RD PS 103J Carbon film 10k RD PS 103J SWITCH Description Part No Push switch mode loudness ASG 063 0 61 12 11 SWITCH CIRCUIT ASSEMBLY AWS 066 0 AF MUT i T LOW FIL Foil Side 9 M AN 9 A MUS 68 ars OY A0 w AOL Su 9 Site wee ty 10982 T 218 or 990023 62 sx 939 Parts List of Switch Circuit Assembly AWS 066 0 CAPACITORS Symbol Description Part No C1 0 068 683K 50 2 0 068 683K 50 0 01 103K 50 0 01 103K 50 RESISTORS Symbol Description Part No R1 Carbon film 82k RD PM 823J R2 Carbon film 82k RD PM 823 R3 Carbon film 3 3k RD PM 332 R4 Carbon film 3 3k RD PM 332J R5 Carbon film 470k RD PM 474J R6 Carbon film 470k RD PM 474 R7 Carbon film 47k 473 R8 Carbon film 47k RD PM 473 R9 Carbon film 5 1k 512J R10 Carbon film 5 1k RDY PM 512 SWITCH Symbol Description Part No Mini switch filters AF muting ASG 062 0 63 Switch Circuit Assembly 12 12 SWITCH CIRCUIT ASSEMBLY AWS 067 0 12 13 14 YT 22 21 S DUPLICATE VR BALANCE VR 250K HB 2 VR MAIN VR 250K Sy PB2 4 ADAPTOR Foil Side
52. nbalanced ON OFF Antenna Input Muting SX 939 AM SECTION Sensitivity IHF Ferrite antenna 300uV m IHF Ext antenna 1 Selectivity 40dB 50dB 65dB 85dB Signal to Noise Ratio Image Rejection IF Rejection MISCELLANEOUS Power Requirements AC 120V 60Hz or 110 120 130 220 and 240V switchable 50 60Hz 290W UL approved model only 470W 5 line voltage model only 022 520 W 175 H 420 D mm 20 1 2 x 6 7 8 16 9 16 in Power Consumption Weight Without Package With Package FURNISHED PARTS FM T type Antenna Operating Instructions Fuse 6A Fuse 3A 18 5 kg 40 Ib 11 oz 2 22 6 kg 49 Ib 12 oz 1 1 i 5 line voltage model only NOTE Specifications and the design subject to possible modification wi thout notice due to improvements 2 FRONT PANEL FACILITIES FRONT PANEL FACILITIES SPEAKER BUTTONS Each of speaker systems A B and is connected to each of output terminals A B and C By pushing the following SPKR A Speaker systems A into operation SPKR B Speaker systems B into operation SPKR C Speaker systems C into operation NOTES 1 When any two pairs of the buttons A B B C C AJ are depressed the corresponding pairs of speaker systems will come into operation However operating all three buttons even though depresse
53. nce between the sound volume from the left and right speaker systems MONITOR 1 2 SWITCHES Monitor the recorded sound while recording with a tape deck Also possible to play back tapes as follows B With a tape deck connected to the TAPE 1 jacks REC and PB either monitoring of recording in progress or playing back is possible With a tape deck connected to the TAPE 2 jacks REC and PB or REC PB con nector the same as in 1 above is possi ble DOLBY NR ADAPTOR SWITCH When employing Dolby Noise Reduction Adaptor depress this DOLBY NR ADAPTOR to ON FUNCTION SELECTOR BUTTONS For selecting the program source push each button 35 follows AM For AM broadcast reception FM For FM broadcast reception The STEREO indicator lights up when the broadcast is in stereo PHONO 1 For operating a turntable connected to the PHONO 1 input jacks PHONO2 For operating a turntable connected to the PHONO 2 input jacks MIC For using a microphone Not possible to mix with other program source AUX For listening to audio equipment car tridge tape player TV sound tuner etc connected to the AUX input jacks DIMMER SWITCH Dims the brightness of the indicator light Press again to restore full brightness FM MUTING BUTTON Leave this button undepressed in the ON position while tuning in FM stations Inter station noise may interfere with FM reception while
54. o frequency composite signal The composite signal following detection is fed to the 4 CH MPX terminal jack and the multiplex decoder stage 8 The multiplex decoder stage uses one IC for three functions to demodulate the com posite signal into the left and right channel stereo signals to operate the automatic mode switching between stereo mono and to switch the stereo indicator lamp appro priately The decoding system uses a phase locked loop PLL circuit which assures continuous stable operation and excellent stereo sepa ration with low susceptibility to external noise such as car ignition noise and am bient temperature changes After decoding the signal is fed to four transistors and one LC filter where the residual carrier component 38kHz 19kHz and SCA is rejected and then to the audio amplifier section 4 The FM muting circuit consists effectively of two circuits designed to reduce the pulse noise which can so easily arise when a muting circuit is operative The one circuit is an electronic switch in corporated into the IC so that the de modulated circuit is switched off and on in the IC and the other gate circuit the com posite signal by means of an FET 5 The AM tuner section employs one mono lithic IC which functions as radio frequency amplifier frequency converter local oscil lator intermediate frequency amplifier and detector The output is a pure audio signal 6 The signals which are app
55. rator output level to 10dB modulated at 400Hz with a frequency devia tion of 75 kHz Adjust for maximum output at 106MHz Adjust for maximum output at 9OMHz Adjust for maximum output at 106MHz 1 Steps 11 12 above should be repeated several times in succession until no further significant improvement is obtained ALIGNING THE FM MPX SECTION Notes This set of adjustments should not be carried out until the alignment of the FM section 1 12 above has been completed The multiplex signal generator should be connected to the external modulator terminals of the FM signal generator 1 SX 939 Control Settings Set the controls Knob and switch of the SX 939 as follows POWER ON FUNCTION FM MUTING OFF 2 Connections between the Test Equipment and the SX 939 e The output from the FM signal generator should be connected to the 3002 antenna terminals of the SX 939 e The output from the MPX signal generator should be connected to the external modulator terminals of the FM signal generator e The oscilloscope X plates horizontal inputs should be connected to the PILOT OUT terminals on the MPX signal generator and the Y plates vertical inputs to terminal number 18 The AC millivolt meter should be connected to the TAPE REC terminals with changeover possible from L to R channels 3 Multiplex Signal Generator Modulation L R 1kHz 67 5kHz deviation PILOT 19kHz 7 5kHz deviation Set the F
56. rd gt A222 Frequenzabweichung von 75 kHz auf 10 dB einzustellen Es ist auf maximalen Ausgang bei 106 MHz einzustellen Es ist auf maximalen Ausgang bei 90 MHz einzustellen Es ist auf maximalen Ausgang bei 106 MHz einzustellen Obige Schritte 11 12 sind mehrfach nacheinander zu wiederholen bis HS weitere merkliche Verbesserung erzielt wird 79 ABGLEICHEN DES FM MPX TEILS Zur Beachtung Die folgenden Einstellschritte sollten nicht vor Beendigung des Abgleichs des FM Teils siehe oben 1 12 durchgefiihrt werden Der Multiplex Priifsender ist mit den Au en modulatoranschl ssen des FM Pr fsenders zu verbinden 1 Regeleinstellungen am SX 939 Die Steuerelemente Kn pfe und Schalter des SX 939 sind wie folgt einzustellen POWER Stromzuf hrung ON Ein FUNCTION Funktion FM UKW FM MUTING FM D mpfung OFF Aus 2 Schaltungen zwischen Pr fsatz und dem SX 939 e Der Ausgang vom FM Pr fsender ist mit den 300 2 Antennenanschl ssen des SX 939 zu verbinden e Der Ausgang vom MPX Pr fsender ist an die Au enmodulatoranschl sse des FM Pr fsenders anzuschlie en e Die x Anoden des Oszilloskops sind mit den Anschl ssen PILOT OUT am MPX Pr fsender und die y Anoden mit dem Anschlu 18 zu verbinden e Der Millivolt Wechselspannungsmesser ist mit den TAPE REC Band aufnahme Anschl ss
57. tuning between stations To suppress this noise leave the MUTING button undepress ed in the ON position If the low signal strength is due to distance from the transmitter or other influences depress this button at which the weak station will be heard with the MUTING OFF LOUDNESS BUTTON Depress this button to listen at low volume The human ear s frequency response varies according to the listening volume The depressed button compensates for hearing response with emphasis on the bass and treble MIC INPUT JACKS ke For connecting the left and right channel microphones NOTE Use the high impedance above 20k9 with 6mm diam phone plugs VOLUME CONTROL Governs both the volume of sound outputs from the speaker systems and from the headphones MODE BUTTON Leave this button undepressed if necessary depress this to release it when already depressed for STEREO playback For MONO playback depress it In this case stereo signals for left and right channels will be mixed into mono signal which will be heard from the center of both speaker systems 3 CONNECTION DIAGRAM TYPE OUTDOOR TAPE DECK TAPE DECK FM ANTENNA ANTENNE AM ANTENNA TURNTABLE TURNTABLE CARTRIDGE open reel cassette TAPE PLAYER 1 LINE LINE LINE LINE p c to INPUT OUTPUT INPUT OUTPUT ground terminal of turntables tape decks etc 3002 feeder 1 l lE I
58. ustellen Der Ausgang des AM Pr fsenders ist auf 30 dB bei 600 kHz einzustellen Es ist der maximale Ausgang bei gleichzeitiger Einstellung des Ferritstabantennenkerns einzustellen einzustellen Obige Einstellungen 4 5 sind mehrfach zu wiederholen bis keine weitere merkliche Verbesserung erzielt wird verbinden 36 dB ist auf einen Niederfrequenzausgang von 70mV einzustellen Niederfrequenzausgang von 310mV durchzuf hren ABGLEICHEN DER ENDVERSTARKERSTUFE 1 LX Eine Einstellung soll so erfolgen da die Spannung auf 50 mV gebracht wird Es ist nichts an die Eingangsbuchsen des SX 939 anzuschlie en ein k nstlicher Widerstand von 8 ist ber die Lautsprecheranschl sse anzulegen Ein Millivolt Gleichspannungsmesser ist zwischen Anschlu 10 25 und Erde zu schalten Eine Einstellung soll so erfolgen die Spannung auf Null gebracht wird Der Gleichspannungsmesser ist zwischen die Anschl sse 50 38 und 44 dri zu schalten

Pioneer sx-939 User's Manual

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