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Pioneer SX-1080 User's Manual

1. wets 39 12 3 Tuner Assembly 8 ae 41 124 Power Transistor Connector Assembly 125 47 12 57 Tone Control Assembly AWG 056 s Wala rni Seg 48 12 6 Flat Amplitiar Assembly GWG TT2 nn Pee epa YR 51 12 7 Power Amplifier Assembly 071 54 12 8 Speaker Selector Assembly 124 57 12 9 Function Equalizer Assembly 5 125 60 58 001 ees ea NRANG 22 64 12 11 Power Supply Assembly 152 66 12 12 Terminal Assembly 6 16 126 2 2 2 5 70 12 13 Terminal Assembly ks ca as 70 12 14 Speaker Terminal Assembly 128 71 1215 Protection 120 722 72 pss E VIE a mo 10 ONU 91A o grace 75 1 SPECIFICATIONS Semiconductors Scares au sp TAN NEA RETAIN NG 5 S t 8 GAN NG a BR 36 Diodes NG TABET ta Sa Dba 42 Power Amplifier Section Continuous power output of 120 watts channel min at 8 oh
2. Ra Pu TUNER Ass y AWE 092 DES TI 0 3505 Da LA s FUNCTION EQUALIZER SUPPLY ASS y ANR 52 _______ 5 34 22 wa 2 4 Us 023012 0 406254 METER i D ye Ps 27153 1 4 den 2 4 ut m Bons Em bw v I ot kat Mam rara E 7 z po 25 TRN 5 Jab PIO aah m 5 en eme 4 E 2 O sn z pr Tono Tax ratis 8 8 2 2 ng n 5 A H 4 121142 5 3 DY SX H 5 uw a A CEN 1 DU Re 0526072 Os Fosa 5 E D Ki i 5 4 1 CAN 13279 nia kois mq qm lt cu SNP EN resisfors 5 1 4W 25 TOLERANCE UNLESS OTHERWISE ATER ED M MQ i 1 CAPAQITORS T5 UNLESS OTHERWISE NOTED pF d Pa Sa a TS schematic diagram put tne actuat B vary ave to improvement in design E T dE paka Y T Sa SIGNAL VOLTAGE AT 140W OUTPUT H ARS QM 25 gt kan 2 raga 0 VOLTAGE AT NO INPUT SIGNAL mn ae DC CURRENT AT NO INPUT SIGNAL Y ISAN y ka SPEAKER SELECTOR METER Asi SWITCHES INPUT TERMI
3. COIL Symbol Part No Description Symbol Part No Description L1 T63 009 AF choke coil R22 RD PS 1613 Carbon film 160 R23 RDAPS 220 Carbon film 22 R24 RDAPS 220J Carbon film 22 CAPACITORS R25 RD PS 220J Carbon film 22 Symbol Part No Description R26 RD PS 220J Carbon film 22 C1 CEANL 2R2P25 Electrolytic 2 2 25 R27 RS2P 100 Metal oxide 10 2w c2 CEANL 2R2P 25 Electrolytic 2 2 25V R28 RD PSF 132 Carbon film 1 3k 03 CCDSL 561K 50 Ceramic 560p 50V R29 RDY PSF 132 Carbon film 1 3k CCDSL 560K 50 Ceramic 56p 50V R30 RDJ4PS 153 Carbon film 15k C5 CCDSL 560K 50 Ceramic 56p 50 R31 RDAPS 153 Carbon film 15k C6 CCDSL 330K 500 Ceramic 33p 500V R32 RD PS 272 Carbon film 2 7k C7 CCDSL 150K 500 Ceramic 15p 500V R33 RD PS 563 Carbon film 56k C8 ACG 009 Ceramic 0 047 150V c9 CCDSL 331K 500 Ceramic 330p 500V C10 CCDSL 331k 500 Ceramic 330p 500V SEMICONDUCTORS Symbol Part No Description c11 CSSA R22M25 Electrolytic 0 22 25V C12 104K 50 Mylar 0 1 50V 01 2SA979 F Transistor C13 104K 50 Mylar 0 1 50V 02 25 1775 Transistor C14 CCDSL 560K 50 Ceramic 56p 50 2SC1885 Q Transistor C15 ACG 009 Ceramic 0 047 150V 04 25 1885 0 or R X Transistor 05 25 912 0 or R Transistor RESISTORS 06 250381 Transistor Symbol Part No Description Q7 2SB536A M Transistor 08 2SC869 D or C Transistor VR1 ACP 019 Semi fixed 100 B 2 063 Semi fixed 150k 01 152471 Diode D2 182471 Diode R1 RD1
4. CSZA 100 16 Electrolytic 10 16 C50 CKDYF 103250 Ceramic 0 01 50V CCDTH 150 50 Ceramic 15p 50V CCDSL 101 50 Ceramic 100 50v C51 CKDYF 4032 50 Ceramic 0 04 50V c3 103250 Ceramic 0 01 50V 652 COA SYN BOP 34081 ca 020 50 Ceramic 2p 50v C53 CKDYF 103250 Ceramic 0 01 50V C5 CKDYF 103250 Ceramic 0 01 50V Ca CROAT 30V C55 CKDYF 1032 50 Ceramic 0 01 50V C6 CKDYF 1032 50 Ceramic 0 01 50V CCDTH 180K 50 Ceramic 18 50V C56 CKDYF 403250 Ceramic 0 04 50V c8 CCDTH 180K 50 Ceramic 18p 50V C57 CKDYF 103250 Ceramic 0 01 50V co CCDSL150K 50 Ceramic 15p 50V C58 CKDYB 102K 50 Ceramic 1000p CCDSL 100 50 Ceramic 10p 50V C59 CKDYF 4032 50 Ceramic 0 04 50V C60 CKDYB821K 50 Ceramic 820p 50V CKDYB 103K 50 Ceramic 0 01 50V 4612 CCDSL 101k 50 Ceramic 100p 50V 61 50 Electrolytic 3 3 50V CKDYB 103K 50 Ceramic 0 01 50V C62 CEA 487 35 Electrolytic 4 7 35V c14 CCDLH 430K 50 Ceramic 43p 50V C63 CKDYB 122K 50 Ceramic 12009 50V C15 CCDCH 080F 50 Ceramic 8p 50V COMA 333350 Mylar 0 033 50 C65 683150 Mylar 0 068 50V C16 CCDCH 330K 50 Ceramic 33p 50V 17 CCDCH 150 50 Ceramic 15 50V C66 CKDYF 4032 50 Ceramic 0 04 50V c18 CKDYB 102K 50 Ceramic 1000p 50 c67 CEA 100P 16 Electrolytic 10 16V C19 CKDYF 4032 50 Ceramic 0 04 50 C68 CCDSL 151K 50 Ceramic 150p 50 C20 CKDYA332J50 Ceramic 3300p 50V C69 CCDSL 1
5. gt 0 2 182413 x2 E 8 2 2 OW CUT CUT FILTER Part List SWITCH SEMICONDUCTORS Symbol Part Description Symbol Part No Description 81 ASG 128 Push switch D1 152473 151555 Diode D2 182473 151555 Diode CAPACITORS List of Changed Parts for Factory Modification Symbol Part No Description a Symbol Part No Description C1 52 RAM 35 Electrolytic 0 47 35V C2 CSZA R47M 35 Electroly tic 0 47 35V 103 50 Mylar 0 01 50V C4 103K 50 Mylar 0 01 50v C5 ACE 043 Styrol 1710p 50v C6 ACE 043 Styrol 1710p 50V RESISTORS Symbol Part No Description R1 RD PS 393 Carbon film 39k R2 RD PS 393 Carbon film 39k R3 RD PS 242 Carbon film 2 4k R4 RD PS 242 Carbon film 2 4k R5 RD PS 474 Carbon film 470k R6 RDXPS 474 Carbon film 470k R7 RD PS 104 Carbon film 100k 64 sx 1080 1 2 1 3 Foil side A FM FM DE FM MULTI EMPHASIS MUTING PATH o o o o o o Sic 51 8 E a 5 Wa O x x 57 34 D 3 3 1587 F 081 95 A De b o ppo 047 95 152473 100K amp 9 9 24 23 22 21 20 19 18 17 16 15 14 13 12 1 O3 5 c PPP 9797979 olo AWG 056 5 gt AWE 092 No 10 AWG 056 No 4 AWE 092 No 1
6. 1542 OFF kHz OFF 200 400 ON OFF ON OFF bobo REC PLAY REC PLAY Lrape 2 VR 1 BALANCE VR VOLUME VR3 BASS VR 4 TREBLE PROGRAM IND FM AM AUX PHONO POWER AMP IN PRE OUT POWER AMP POWER SUPPLY METER AMP 13V TONE CONTROL 33V METER AMP 13V EQUALIZER APOWER 23V EQUALIZER 8 POWER 23V POWER 60 PROTECTION POWER AMP 60V PROTECTION Assy POWER 62V POWER 62V PROTECTION Assy a SX 1080 HEADPHONES METER AMP 822 SPA 8 O jik CF 999 DIAL SCALE LAMP 18 8 CIRCUIT DESCRIPTIONS Refer to the block diagram on page 17 and the schematic on page 37 for the circuit composition of this unit 8 1 FM TUNER FM Front end The FM front end employs a 4 stage variable capacitor in the tuning circuit dual gate MOS FETs at the RF amplifier and mixer and a local oscillator with J FET buffer The FM front end input is 750 unbalanced single tuned circuit The RF amplifier is a dual gate MOS FET An M coupled double tuned circuit is inserted between stages The dual gate FET is an amplifying element suitable for RF circuits and features extremely stable amplification because of its low NF N
7. ga LA ESO et 90dB ESDODSEN ato Sec os dad 100dB AM SUDBPOSSIBDI 55dB PNIS REESE 19 2dBf 5 Stereo Separation 50dB 1 2 3548 30Hz 15kHz S bcartier Product Ratio 65dB SCA Rejection eon 65dB Antenna put 2222 300 ohms balanced 75 ohms unbalanced AM Section Sensitivity IHF Ferrite antenna 300uV m antenna 22252502606 15uV SelactiVity AA 30dB Signal to Noise 50dB Image Response 40dB kana 40dB no Na Ja FG Built in Ferrite Loopstick Antenna Miscellaneous Power Requirements 120V 60Hz Power Consumption 350W UL 800W CSA 1100W Dimensions 526 W 176 440 D mm 21 11 16 W 6 15 16 x 17 5 16 D in Weight Without 21 3kg 471b WithiBackage 24 2kg 5315 602 Furnished Parts Antenna 1 Operating Instructions a 1 HERO Wah Imo re ann ere os Nda 1 Measured pursuant to Federal Trade Commission s Trade Regulation rule on Power Output Claims for Amplifiers NOTE 5 Specifications and the design subject to possible modifica tion without notice due to improvements
8. 176 7 Hexagonal wrench ANK 018 FM antenna ADH 002 Case AHC 042 Air cap AHG 040 Packing case KU AHD 505 75
9. HEADPHONES JACK 150 38 Dio 152473 02 152473 R4470 a o Da 192473 Rs 390 Ka 5 6K Du oo C3 t 4U6 04 152473 47 6 07 13V Ra 150 2 200K 152473 nn AWE 092 No 11 lt _ 120 94 GWS 25 AWE 092 30 9 AWE 092 AT PL STEREO INDICATOR rH AWM 120 No 6 GWS 128 No GWS 128 No OVS gt AWM 120 No 7 gt GWS 128 No D AWR 152 No 28 58 io N pi eo z gt E 8 lt tc ES lt 2 o 3 e SX 1 080 1 2 3 4 5 6 PL AWE 092 No 29 STEREO IND A AWE 092 No 25 AWE 092 No 15 A AWE 092 No 8 lt gt AWE 092 No 11 AWE 092 No 5 AWE 092 No 30 AWE 092 No 6 AWM 120 No 9 AWE 092 gt GWS 124 No 5 GWG 112 No 4 GWG 112 N0 3 gt AWR 152 No 16 GWG 112 No 10 GWG 112 No 2 AWT 001 No 10 BNRB GWG 112 No 1 AWE 092 No 28 001 No 17 AWT 001 No 15 a side 4 amp B PL a
10. g TERMINAL ASS y LR cn 885 128 il s 1 ome si 5 ae da o E Fe fn FLAT Ass y GWG 12 UNE a Pan Tia KON dua 129 5 152671 Ass bul KO B EJ TEM Y ui CU RILTER x EE 4b ew MON mj npa V Ka Bai pn gt 4 N3 Naa gt 1 premi CAS _ E mes a Oy 254133 Leh ROM TEST ER m i x 4 25MM HE es o WT 2 te 1 RUBIO Se 3 sro 8 LI 1 i pen R 2 9 o 4 H Lo mal E sem H 3 A 4 Ed 1 40 41 7 es 12 3 TUNER ASSEMBLY AWE 092 1 TO PER E 033 gt SS 28 es 4 TA7302P Pru sag z al 261 121 1 E Mag pil dy 52 54 x Ba 5 E 2 6 dai E Ste E Nag FM T MET 1 1 W m gt jr Eu 120 1420 E 542 H z MULTI PATH MUT AUTO OUT KA 5 15 STEREO IND 14 AUTO IN 5 E 5 a 18 x S 8 ale 8 8
11. 70 7 S AWE 092 No 27 dS s TUNING METER PHONO sla 5 v E 25C945A 885 5 io 8552 Ag 2200P 3 E 4 SIGNAL D D sal Parts List of Function and Equalizer Assembly GWS 125 SWITCH Symbol Part No Description Symbol Part No Description si ASG 126 Push switch R14 ACN 012 Metal film 92k R15 RDAPS 101 Carbon film 100 CAPACITORS R16 RD PS 1013 Carbon film 100 E R17 RDXPS 511 Carbon fim 510 Symbol Part No D katibay 818 RDXPS511J Carbon film 510 510350 Ceramic 51p 50V R19 RD PS 104 Carbon film 100k c2 CCDSL 510150 Ceramic 50v R20 RD PS 104 Carbon film 100 c3 CEANL 2R2P 50 Electrolytic 2 2 50V 4 CEANL 2R2P 50 Electrolytic 2 2 50V R21 5 101 Carbon film 100 c5 CCDSL 220K 50 Ceramic 22p 50V R22 5 101J Carbon fiim 100 R23 RD PS 471 Carbon fim 470 CCDSL 220K 50 Ceramic 22 50V R24 RDXPS 471 Carbon film 470 CCDSL 101 50 Ceramic 100p 50 R25 RDAPS 471 Carbon film 470 CCDSL 101K 50 Ceramic 100p 50V c9 CEA 471P6 Electrolytic 470 26 RDXPS 471 Carbon film 470 CEA 471P 6 Electrolytic 470 R27 5 393J Carbon film 39k R28 RD PS 184 Carbon film 180 c11 CEA 101P 25 Electrolytic 100 25V R29 RD PS 184 Carbon film 180k 12 101P 25 Electrolytic 100 25 R30 RD PS 103 Carbon film 10k C13 103G 50
12. Q current amplifies the DC voltage from D to drive the power meter Rs 0 Rio 01 Da Rn Di Fig 6 Schematic diagram of meter amplifier OUTPUT VOLTAGE INPUT VOLTAGE INPUT VOLTAGE Fig 7 Schematic diagram of logarithmic compressor 21 8 7 PROTECTION CIRCUIT The purpose of this circuit is to protecty both the speakers and the power amplifiers The relay in the output circuit is automatically opened in any of the following cases 1 During the transient operations when the power supply is turned on and off 2 Upon detection of an overload caused by a short circuit in the load 3 Upon detection of a DC voltage in the output circuit caused by component failure or cident An outline of this circuit is shown in Fig 8 1 The relay activating transistor Qr is controlled by the IC PA3004 Muting Operation When Power Supply Is turned Off and On Fig 8 1 When the power supply is first turned on the voltages on pins 1 7 and 6 of PA3004 will exceed a prescribed level If there is no input DC on pin no 4 S will be off and a charging current will commence to flow to the timing capacitor Ct connected to pin no 8 Once Ct has been charged up to a level where the voltage on pin no 8 exceeds a prescribed level S will turn on thereby applying a bias current from pin no 3 to the relay driving transistor Qr Consequently Qr will turn on and current will flow thro
13. 124 s5 GWS 124 SPEAKER 5 4 1 GWS 124 C 1 9 Parts List Symbol Part No Description AKE 029 Push terminal C m 1 AE 12 15 PROTECTION ASSEMBLY AWM 120 A R318K R4 03 152471 10 B 9 02 152471 41 254733 22 2561438 a 004 2 2K 2W Di 2 130 e P 11 12 d D imt 1 3 SX 1080 qt Power transformer 2 2M AWR 152 No 19 AWR 152 No 1 side ov O No wo Y B 0 7 425 1438 52 ag o 131 Ha a TONG y 254155 Sz 1 o wo dV n Da 152471 o po 4 V wong 2 7 2093 004 7 5 x sinis Hap lt AAN EI RELAY T lt 3 MZ 130 IR i L NE v B B S AT MO ALI AWE 092 No 11 GWS 124 No 5 4 AWR 152 No 16 gt 5 125 No 26 WE 092 No 30 PL STEREO IND 15 071 10 45124 402 tu GWS 124 No 1 gt 071 10 No 2 e AWH 071 No 2 L D AWH 071 No 1 R SAWH 071 No 1 L gt AWR 152 No 27 AWR 152 No 14 73 Parts List of Pr
14. 600kHz and 1400kHz Adjust F for maximum output Adjust the core of the bar antenna at 600kHz reception and trimmer TC at 1400kHz re ception for maximum output and minimum output deviation at 600kHz and 1400kHz A Ts SX 1080 Fig 9 Oscilloscope Terminal TAPE REC Terminal qu AM ANTENNA 1kQ resistor Connection of AM tracking adjustment 23 9 2 ag FM TUNER Confirm that the dial is set to te start point Connect as shown in Fig 10 and set the FUNC TION switch to FM and the MUTING switch to OFF Set an FM signal generator to 400Hz 100 modulation 66dB output Set TC to near center capacitance set the FM signal generator and the SX 1080 dial pointer to 90MHz and adjust T for maximum deflec tion at the signal meter Under the state of 2 above adjust the primary bottom core of T so that the pointer of the tuning meter deflects to the center of the scale Set the FM signal generator output to 15dB and adjust T T for maximum output Set the FM signal generator and the SX 1080 dial pointer to 106MHz and adjust TC for maximum deflection at the signal meter Make the FM signal generator output 10dB Set the FM signal generator output to 15dB and adjust TC TC for maximum out put Repeat steps 2 6 until receptio
15. AES tb M ak5 215 2122 1 5 FM DE EM DE EM FM MUT IN vco vco OUT IN OUT OUT KILLER 1 1 1 1 2 3 4 5 6 gt 152 No 16 7 GWS 124 No 5 SAWM 120 No 9 56W5 125 No 26 STEREO IND GWS 125 21 lt GWS 125 20 GWS 125 No 22 SWS 125 No 18 4 AWT 001 No 1 Foil side AWT 001 No 9 Antenna terminal AM T3930 43 53 13052327 24 gv Rai 47K T T 2 E 2 016 Cay if R57 22K 1 Ka AWT 001 No 3 4 v a 175 a vro AWT 001 No 4 4 Se Um v ma Cp Wo 04 AWT 001 18 BA 7 15P 9 wwo R21 300K AWT 001 No 2 AWT 001 No 14 AWT 001 No 12 BLK GWS 125 No 25 gt GWS 125 No 28 AWT 001 No 13 GWS 125 No 23 TUNING METER gt GWS 125 No 30 gt AWT 001 No 16 6X 1080 Parts List of Tuner Assembly AWE 092 TRANSFORMER COILS AND FILTERS Symbol Part No Description Symbol Part No Description AT ATC 021 FM antenna coil C25 CKDYF 4032 50 Ceramic 0 04 50V T2 ATC 015 FM RF coil T3 ATC 016 FM RF
16. Ceramic 10p 50V 02 25 1919 or G Transistor C28 CCDSL 100F 50 Ceramic 10p 50V 25 1312 or Q RESISTORS List of Changed Parts for Factory Modification Symbol Part Description Description VR1 ACV 136 Variable resistor 100k B VR2 ACV 136 Variable resistor 100k B R1 RD PS 104J Carbon film 100k R2 RD PS 104J Carbon film 100k R3 RD PS 223J Carbon film 22k R4 223 Carbon film 22k R5 223 Carbon film 22k R6 223 Carbon film 22k R7 5 105 Carbon film 1M 50 SX 1 080 12 6 FLAT AMPLIFIER ASSEMBLY GWG 112 Parts List SWITCHES Symbol Part No Description Symbol Part No Description 51 ASK 145 Lever switch R16 RD PS 101 Carbon film 100 82 ASK 144 Lever switch R17 223 Carbon film 22k S3 ASK 144 Lever switch R18 223 Carbon film 22k S4 ASK 144 Lever switch R19 134J Carbon film 130k S5 ASK 144 Lever switch R20 RD4PS 134 Carbon film 130k S6 ASK 144 Lever switch R21 RDYPS 753 Carbon film 75k R22 RD PS 753 Carbon film 75k R23 RD PS 1223 Carbon film 1 2k CAPACITORS R24 RDMPS 122 Carbon film 1 2k Symbol Part No Description R25 RDXPS 822 Carbon film 8 2k CCDSL 151K 50 Ceramic 150p 50V R26 RDXPS 822J Carbon film 8 2k 62 CCDSL 151K 50 Ceramic 150p 50V R27 392 Carbon film 3 9k 52 1 35 Electrolytic 0 1 35V R28 RD APS 392 Carbon film 3 9k C4 52 0 1 35 Electrolytic 0 1 35V R29 RD PS 103 Ca
17. Nut 022 176 Knob VOLUME 871 004 174 2 Knob TUNING 11 2 COMPONENT OF PANEL STAY PANA paaa 1 Filter assembly Screw NP lt gt 067 2 Speaker switch assembly Dial scale hold me GWS 124 114 2 Pulley small Shield case Capacitor cover AEC 294 Lever switch ASK 080 Binder B71 004 type pilot lamp AEL 029 4 067 020 _ Sa Dressing plate 18 AEL 069 RT 3x6 L Dial panel 4 AAG 141 Dial pointer assembly 65 Tone control assembly AWG 058 _ 4 Shaft cover 114 alley small Speaker shield plate ront frame Lamp socket 005 Wedge type pilot lamp AEL 029 pe socket Screw 005 067 Pilot lamp with wire STEREO Pilot lamp with wire AM RT 3 6 AEL 067 NOTE Parts indigated in green type cannot be supplied Meter holder Double meter SIGNAL TUNING AAW 075 Pilot lamp with wire PHONO 067 Pilot lamp with wire AEL 067 1 Dial shaft assembly AXA 180 Dial scale hold metal Ba HALA SAMAAN Function and equalizer assembly 1 GWG 112 GWS 125 Flat amplifier assembly aE TE Sma an a AA a NAGA KA SX
18. Polypropylene 0 01 50V C14 1036 50 Polypropylene 0 01 50V R31 RD PS 103 Carbon film 10k C15 353G 50 Polypropylene 0 035 50V R32 T 30 T R33 RD PS 330 C16 353650 Polypropylene 0 035 50V i RI i C17 CEANL 2R2P 50 Electrolytic 2 2 50V R35 5 560 Carbon film 56 C18 CEANL 2R2P 50 Electrolytic 2 2 50V C19 CEA 221K 6 3 Electrolytic 220 6 3v C20 472K 50 Mylar 0 0047 50V SEMICONDUCTORS Symbol Part No Description 21 272 50 Mylar 0 0027 50V T 3T Xi 22 100 16 Electrolytic 10 16V Q1 HA 1457 IC 23 CKDYF 222250 Ceramic 2200 50V 02 1457 24 2222 50 Ceramic 2200p 50V Q3 2SC945A QorR Transistor C25 CCDSL510J50 Ceramic 51p 50V 25C1914 F C26 CCDSL 510 50 Ceramic 51p 50V OTHER RESISTORS Symbol Part No Description Symbol Part No Description AKN 012 Mic jack R1 RDXPS 104 Carbon film 100k List of Changed Parts for Factory Modification R2 RDAPS 104 Carbon film 100k R3 RDAPS 471 Carbon film 470 Description Ra RD amp PS 471 Carbon film 470 R5 RD PS 104 Carbon film 100k R6 RDXPS 104 Carbon film 100 R7 50 14705 Metal film 147 R8 50 1470F Metal film 147 RDAPS 101 Carbon film 100 R10 RD PS 101 Carbon film 100 R11 ACN 011 Metal film 7 55k R12 ACN 011 Metal film 7 55k R13 ACN 012 Metal film 92k 63 12 10 FILTER ASSEMBLY AWT 001 a FM MUTING FILTER Ass y 001 C 041 25
19. are requested to amend parts 07 2SB701 A B C Transistor number in this parts list 258701 Transistor List of Changed Parts for Factory Modification LAMPS AND FUSES Symbol Part No Description PL1 AEL 069 Pilot lamp with wire FM PL2 AEL 067 Pilot lamp with wire AM 36 External Appearance of Transistor and ICs 1001 1002 PA3001 1197 TA7302P 25 34 25 68 35 45 25 55 910111213141516 Index 1234567 Index m Circuit Diagram of IC HA1197 1457 25 733 25 872 25 945 25 1438 25 1775 25 1906 25 1915 25 7265 25 904 25 869 25 1312 25 1914 25 1919 2SA850 2881735 876543 1 1 sx 1080 2SA979 Bi Ci Ba 25 684 254912 2801384 E 25 1885 258536 250381 258682 250712 37 1 12 2 SCHEMATIC sx 1080
20. film 100 51 1 Flat Amplifier Assembly GWG 112 TUN 1081 03 68150 0301 35 C5 1 0 25 E Spa ap TX PENS 92252 79 0 side GWS 125 No 132 ag GWS 125 No 15 GWS 1257 16 GWS 125 11 AWH 071 No 5 AWR 152 No 25 AWG 056 No 6 AWH 071 No 4 AWR 152 No 24 GWS 125 No 10 AWG 056 No 7 AWG 056 No 8 53 1 2 127 POWER AMPLIFIER ASSEMBLY AWH 071 8 say 457254912 250381 2 12 254979 25 869 IW JAK S 07 2SB536A 182471 x2 60V 0 2SCIT75A 2581885 x2 021524712 os 57 40 5 AWX 125 No 3 gt 125 No 3 AWX 125 No 1 gt AWX 125 No 1 AWX 125 No 4 AWX 125 No 4 AWX 125 No 2 AWX 125 No 2 AWR 152 No 8 AWR 152 No 7 Foil side AWM 120 No 2 AWR 152 No 27 AWM 120 No 8 AWM 120 No 4 AWR 152 No 22 AWM 120 No 3 gt GWG 112 No 5 gt AWR 152 No 25 AWR 152 No 24 GWG 112 No 9 AWT 001 21 lt gt AWT 001 No 19 PRE OUT 9 O an a PRE OUT POWER IN POWER IN AWT 001 No 20 55 Parts List of Power Amplifier Assembly AWH 071
21. pas R43 105 Carbon film 1M aosi 4i R44 RD PS 1041 Carbon film 100k MEE a R45 751 Carbon film 750 VR5 ACP 056 Semi fixed 22k ka R46 332 Carbon film 3 3k RA 1054 Carboh film 1M Ra poi 220 2 RDAVS 182 Carbon film 1 8k SOME IT Dan Age R3 RDPS 562 Carbon film 5 6 EYE 51255717 karan filmy 7470 ip mop MN RB0 RDXPS 303 Carbon film 30k NG aie Un GO R51 RDAPS 303 Carbon film 30k R6 RDAVS 224 Carbon film 220 pp NG Aka pdi 27508 R7 RD PS 123 Caren film 12k R53 RDY PS 222 Carban film 2 2k i R54 104 Carbon film 100k R8 RDXPS 1514 Carbon film 150 ABE Wa RUBS 9 220 Carbon film 22 R10 RDXPS 121 Carbon film 120 RA R11 DX VS 1031 Carbon film 10k m PRAES 422 246 R58 RDJ4PS 222 Carbon film 2 2k R12 RDXVS472J Carbon film 4 7 859 RDUPS 752 Carbon film 7 5k 813 XPS 102 Carbon film 1k R14 5 121 Carbon film 120 Mapa RRUES Sees Carbon tim 82k R15 RDUPS 101 Carbon film 100 BA ix Wa dori olt LAB HA R62 RDUPS 151 Carbon film 150 ener SAPA R63 RDUPS 562 Carbon film 5 6k R18 560 Carbon 56 Lil 82 Carbon film bok ing PAANAN Carbon fil R65 5 201 Carbon film 200 R20 RDXPS331J Carbon film 330 R66 RDAPS 18
22. pin jack 035 socket AKP 005 Power cord ADG 013 Speaker terminal assembly GWS 128 Jumper plug AKM 004 15 6 LEVEL DIAGRAM AUX FLAT amp POWER amp PHONO 1 PHONO 2 Mic Level 40 9 30 20 10 Ba KA 3TV 80 17 848 LOSS 0 898 150mV AUX 35 588 2648 2 5mV PNONO 1 2 60 E 16 0 dBv 1V Frequency 1 kHz 7 BLOCK DIAGRAM Bor ontenna L ch AUX PHONO 1 D nd PHONO 2 lt EE MIC R ch PHONO 2 1 PHONO 4 6 AUX SWITCHES 81 POWER ON OFF 52 RELAY ON OFF Ss DUPLICATE ON OFF Sa TAPE MONITOR 1 ON OFF 5 TAPE MONITOR 2 ON QFF 56 MODE STEREO MONO ST MUTING 2088 Sa LOUDNESS ON 59 ON OFF 10 FM QN OFF Su PHONO 1 ON OFF 512 PHONO 2 7MIC ON QFE 513 AUX ON OFF 514 DE EMPHASIS 7545 255 18 FM MUTING ON OFF EQUALIZER AMP 8 6 517 Sie 819 520 521 22 523 FM MULTIPATH LOW FILTER HIGH FILTER BASS TURN OVER 1 27 REC PLAY REC PLAY TREBLE TURN OVER 5kH 2 5kHz TONE SPEAKERS A SPEAKERS 11 ON
23. the dial pulley 3 Position the dial pulley so that the set screw is at the top and tighten the screw 4 Pass the string through the notch in the dial pulley wrap it 1 2 turn around the pulley and pass it thru pulley gt B pulley C gt dial shaft 3 turns pulley D Next wrap the string two turns around the pulley along the pulley grooves and tie it to the spring hook 5 Turn the dial shaft and confirm that the movement of the dial pulley and string is normal and then cut off the surplus tring Blind sash 6 Turn the dial shaft counter clockwise variable capacitor vanes fully outside and set the dial Fig 16 Remove blind sash pointer to the start point of the scale and attach it to the string Dial pointer Dial shaft Kota Start point TAN PANATA AA gt 1 2 turn along groove Fig 17 11 EXPLODED VIEWS The following symbols stand for screws washers and nuts as shown in exploded view Symbol Description Shape Symbol Description Shape RT Brazier head tapping screw type washer 4 Pan head tapping screw Flat washer BT Binding head tapping screw sw Spring lock washer Countersunk head tapping screw Dr N Nut UT Truss head tapping screw WN Washer faced nut H pourtecsunkiheseitapping ITW Internal toothed lock washer
24. to 20 000Hz 1V output No more than 0 05 Frequency Response PHONO RIAA equalization 20Hz to 20 000Hz 0 2dB Lt erts 5Hz to 80 000Hz dB SX 1080 Tone Control BASS 7dB 10dB 100Hz Turnover Frequency 200Hz 400Hz 7dB 10dB 10kHz Turnover Frequency 5kHz 2 5kHz Filter LOW aan netos 15Hz 6dB oct FANG ouest 6kHz 6dB oct Loudness Contour Volume control set at 404 position 6dB 100Hz 3dB 10kHz Hum and Noise IHF short circuited A Network PHONG water cin serine 76dB AUX TAPEIPUAY mE et UNE S 90dB EE 20dB FM Section Usable Sensitivity yana japa OS ES 9 8dBf 1 7uV 5048 Quieting Sensitivity 14 2dBf 2 8uV BIDEREQ S ose SURE S IPS CAE 37dBf 39uV Signal to Noise Ratio 557598 c 74dB at Sz ee er 80dB STEREO oco d E 71dB Distortion at 65dBf 100 2 0 1 0 2 1kHz RE 0 1 0 15 6kHz MONO STEREO 101 0 1 0 2 Frequency Response 30Hz to 15 000Hz 0 5dB Capture Ratin ra AK conn te E TS LAR 1 0dB Alternate Channel Selectivity lt rsrs 80dB SPURIOUS 22244240594 100dB Image esposo
25. 04 Fuse 1 5A FU3 AEK 106 Fuse 1A RESISTOR FU4 106 Fuse Symbol Part No Description 106 R1 RD PS 225J Carbon film 2 2M FU6 AEK 106 Fuse 1A R2 RS 2P 122 Metal 1 2 2 R3 RS 2P 122 Metal oxide 1 2k 2 OTHERS CARAGINORES Symbol Part No Description Symbol Part Description O AWE 092 Tuner assembly c1 CKDBC 104225 Ceramic 0 1 25V GWS 125 Function and equalizer assembly c2 CKDBC 1042 25 Ceramic 0 1 25V GWG 112 Flat amplifier assembly c3 CKDBC 104225 Ceramic 0 1 25V AWG 056 Tone control assembly 4 CKDBC 1042 25 Ceramic 0 1 25V AWT 001 Filter assembly C5 ACG 001 Ceramic 0 01 250V GWS 124 Speaker switch assembly C6 ACG 003 Ceramic 0 01 125v AWH 071 Power amplifier assembly 085 Electrolytic 22000 71v AWR 152 Power supply assembly ACH 085 Electrolytic 22000 71v AWM 120 Protection and surge killer c9 CEA 010P 80 Electrolytic 1 assembly AWX 125 Power transistor connector SEMICONDUCTORS assembly Symbol Part No Description GWS 126 Input terminal assembly GWS 127 Input terminal assembly 01 250737 or Transistor GWS 128 Speaker terminal assembly 02 250737 C Transistor ATB 505 Bar antenna 258701 or C Transistor AXB 012 Bar antenna holder 04 2SB701 A B C Transistor 05 250737 C Transistor 5 5 y 3 List of changed parts information will be furnished 06 2SD737 A B or C Transistor whenever necessary and you
26. 1080 NOTE Parts indi ated in green type cannot be supplied 11 3 COMPONENT OF CHASSIS Screw Insulator ABA 188 AKX 054 Transistor 250737 Insulator spacer NE Power transistor connector AEC 339 87 assembly AWX 125 rew Screw SA use 1 5A FU2 BA 190 J 188 gu 104 Scre i Screw Heat sink Fuse FU3 FU6 i 190 rew paaa ee MA MABASA ee Capacitor ACG 003 O Fuse 10A FU1 302 Capacitor cover n AEC 279 1 RT 3x6 AMAG an I maana aaa Power amplifier assembly AWH 071 1 1 nsulator Power supply assembly 8 7 AKX 054 AWR 152 5 F LRT 3x6 apacitor ACH 085 Transistor 258701 nsulator spacer Viktor AEC 339 ATV 4H 1 Gong Insulator spacer E Transistor 29B701A Insulatior 054 T ABA 129 ABA 188 A 7 ower amplifier assembly paa IK Heatsink lt lt TE i nibus AN pai Heat sink RT 3x6 T 3x6 r o Insulator spacer AEC 339 ransistor Ss transistor corpnector 250737 assembly AWX 125 Scfew Insulator Terminal Tuner shield plate ABA 188 054 MU clipper 4 RT 3x6 Y 1 Wire clipper Dial pulley assembly AXA 113 Sa aaa Wire clipper Boss AEC 259 Tuner assembly AWE 092 Frame R Protection assembly 120 s
27. 1J Carbon film 180 d TS Foon R67 RDAPS 1031 Carbon film br cado R68 RDXPS 103 Carbon film 10k D 4 R69 2221 Carbon film 2 2k Tan anah ise 70 102 Carbon film 1k R25 8 221 Carbon film 8 2 1 R71 RD amp VS 560J Carbon film 56 R72 RDXVS 560J Carbon film 56 46 SEMICONDUCTORS List of Changed Parts for Factory Modification Symbol Part No Description Description 01 3SK45 B FET Q2 3SK45 B FET Q3 25 1906 Transistor 04 7302P IC 05 PA3001 A IC 06 1001 IC 07 1002 IC 08 HA1197 IC 09 25 55 0 01 152473 Diode 12 4 POWER TRANSISTOR CONNECTOR ASSEMBLY AWX 125 AWH 071 No 14 AWH 071 No 21 AWH 071 No 16 Foil side AWH 071 No 19 Re 47 18 AWH 071 No 17 AWH 071 No 18 AWH 071 No 15 AWH 071 No 20 Parts List RESISTORS Symbol Part No Description R1 RN1H 4R7J Metal film 4 7 Tw R2 RN1H 4R7J Metal film 4 7 1w 47 48 1 125 TONE CONTROL ASSEMBLY AWG 056 100K VRi b VRi d IYA 1081802 318381 1091809 5578 7 CT Cio 8000 51000 it 100k 100 KA CB C Riz 100K 6 88 C3 t B 0 02 SX 1080 Foil side Ri
28. 4 AWG 056 No 35 AWE 092 No 20 gt AWE 092 No 16 gt AWE 092 No 18 gt AWE 092 No 12 GWS 125 No 27 AWE 092 No 22 e AWE 092 No 23 gt AWE 092 No 21 GWS 125 No 31 gt AWE 092 No 26 GWS 125 No 29 AWH 071 No 6 092 No 19 POWER IN PRE OUT PRE OUT POWER IN AWH 071 No 7 L D AWH 071 No 6 RIS 65 1 2 12 11 POWER SUPPLY ASSEMBLY AWR 152 20 33V KBPCIO 02 C5 0 01 4 2K 1 2W R12 8 22 60V Kan 23 23V 21 GND O 25 23V 1 258682 921 60V 250712 28 13 16 13 0V 7 5 18 FUNCTION IND 66 SX 1080 GWS 125 No 5 A AWG 056 No 2 AWM 120 12 lt AWH 071 No 8 AWH 071 No 4 lt AWH 071 No 5 GWEN Nga AWM 120 No 2 AWH 071 No 1 2 GWS 124 No 3 lt Foil side BE B 5 12 230 8 13V 10 i a o Pf x 01 2 230 5 542 sana et a o Ot Mo d Ou 204 2969454 A 8 245 527 258682 250712 Aa 2 2 x a 41150 5 Ri08 2K 128 023 EF 2200 35 9296735 5 E 4116 Nang 13 RAISK Ds 2 130 avc R5 15K gt R 15k 13V as Re 1 5K 01 Ru 16
29. 4PS 564 Carbon film 560k D3 10 5 01 02 Diode R2 5 1021 Carbon film 1k 04 10EA or 51 01 02 Diode R3 RD PS 102 Carbon film 1k 05 STV4H Varistor R4 RD PS 243 Carbon film 24k R5 RDAPS 124 Carbon film 120k D6 152471 Diode D7 152471 Diode R6 RD PS 243 Carbon film 24k R7 5 272 Carbon film 2 7k R8 RDAPS 2724 Carbon fiim 2 7k OTHERS R9 RDXPSF 151 Carbon film 150 Symbol Part No R10 51 103 Metal oxide 10k 022 4P plug R11 101 Carbon film 100 AEC 410 Transistor cover R12 RD PSF 151 Carbon film 150 ANH 203 Heat sink R13 RD PS 562 Carbon film 5 6k R14 1514 Carbon film 150 List of Changed Parts for Factory Modification R15 151 Carbon film 150 UM Description R16 RT5B OR5K Wier wound 0 5 5W R17 RT5B OR5K Wier wound 0 5 5W R18 RT5B OR5K Wier wound 0 5 5W R19 RT5B OR5K Wier wound 0 5 5W R20 RS2P 100 Metal oxide 10 2w R21 RS1P 562 Metal oxide 5 6k 12 8 SPEAKER SELECTOR ASSEMBLY GWS 124 SX 1080 Parts List SWITCH Symbol Part No Description Symbol Part No Description ASG 133 Push switch 011 152473 151555 Diode CAPACITORS OTHER Symbol Part No Description Symbol Part No Description C1 CSZA 4R7M 6 Electrolytic 4 7 6v AKN 010 Headphone jack c2 CEA 330P 10 Electrolytic 33 CSZA 4R7M 6 Electrolytic 47 6v List of Changed Parts for Factory Modification C4 CEA 330
30. 51K 50 Ceramic 150p 50V CSZA4R7M 16 Electrolytic 4 7 16V 21 4032 50 Ceramic 0 04 50 C22 CCDSL 121k B0 Ceramic 120p 50 CKDYB 821K 50 Ceramic 820p 50V C23 473225 Ceramic 0 047 25V c72 CKDYB 561K 50 Ceramic 560p 50 C24 CKDBC 4732 25 Ceramic 0 047 25V C73 CSZA 100M 16 Electrolytic 10 16V 45 Symbol Part No Description Symbol Part No Description C74 ACE 019 Styrol 880p R26 RDXPS511J Carbon film 510 C75 CKDYB 561K 50 Ceramic 560p 5DV R27 RD PS 242 Carbon film 2 4k R28 RDXPS 163 Carbon film 16k C76 CSZA4R7M 16 Electrolytic 47 16V R29 RDY PS 222 Carbon film 22k C CKDYB821K 50 Ceramic 820p 50V R30 RD PS 102 Carbon film 1k C78 CEA 221 16 Electrolytic 220 16v C79 CEA 330P 16 Electrolytic 33 16v R31 RD 4PS 822 Carbon film 8 2k C80 473k 50 Mylar 0 047 R32 RD PS 1514 Carbon film 150 R33 RD PS 3324 Carbon film 3 3k C81 CEA 101P 16 Electrolytic 100 16V R34 RDXPS332J Carbon film 3 3k C82 CKDYF 403250 Ceramic 0 04 R35 RDXPS 152 Carbon film 1 5k C83 CEA 101P 6 Electrolytic 100 6V C84 821k 50 Ceramic 820p 50V R36 RD PS 152 Carbon film 1 5k C85 CKDYF 403250 Ceramic 0 04 R37 RDYPS 1614 Carbon film 160 Yaw R38 RDXPS822J Carbon film 8 2k R39 RDXPS 1824 Carbon film 1 8k RESISTORS R40 RDXPS 104J Carbon film 100k Description Ra1 473 Carbon film 47k 1904 R42 RN SQ1SO2F Metal film 15k uw No eds e m
31. AM FM STEREO RECEIVER SERVICE MANUAL MODEL 8 1080 COMES IN FIVE VERSIONS DISTINGUISHED AS FOLLOWS SX 1080 Type Voltage Remarks KU 120V only U S A model KC 120V only Canada model HG 220V and 240V Switchable Europe or Oceania model 5 110V 120V 220V and 240V Switchable General export model 5 6 110V 120V 220V and 240 Switchable U S Military model NOTICE This service manual is applicable to the SX 1080 KU The SX 1080 HG S G 5 KC service manual is issued as an appendix CONTENTS 1 0014 2311 19 aa GOL iS a Rane SR 2 CONNECTION DIAGRAM 2 nnm aln n raro inia lareo n o Rn 3 BRONT PANEL FACILITIES das ate 8 DISASSEMBLY a 5 PARTS LOCATION Bai Front PrO NAA BAG nb 5 2 Front View with Front Panel Removed 53 Top View with Bonnet Removed seme 54 Bottom View with Bottom Plate Rear Pandi VIBW a nkk a NG lan NAA CUEVEL DIAGRAM ana X908 A APA PG p AG BLOCK DIAGRAM NAO 8 CIRCUIT DESCRIPTIONS GAMA ga na a s NG Oen 8 2 Phone Mic inpu
32. K 2548501381 gt BWS 124 No 5 T PL STEREO INDICATOR AWE 092 No 15 9 5011 2 026 8 092 30 AWM 120 No 1 22000 71 C 22000 71 AWH 071 No 22 gt AWH 071 No 12 ot 220 80 02 220 100 5001 2600 R2 I0K 28 Ra 20 BLU BLU OR 5 120 No 13 GAN 3 BRN 2 BRN 0 01 o t3 GRN s 5 ped WHT RED WHT 1 2 2M Aw 2 AWM 120 No 14 OK Dial scale Dial scale 3 PL Dial scale 68 Parts List of Power Supply Assembly AWR 152 CAPACITORS SEMICONDUCTORS Symbol Part No Description Symbol Part No Description C1 ACG 004 Ceramic 0 01 150V Qi 250712 0 or C Transistor c2 ACG 004 Ceramic 0 01 150V 02 28C1735 D or C Transistor c3 ACG 004 Ceramic 0 01 150V 25 1384 or C4 ACG 004 Ceramic 0 01 150v 2SA850 D C Transistor C5 ACG 004 Ceramic 0 01 150V 2SA684A Q C6 ACG 004 Ceramic 0 01 150V Q4 28B682 D or C Transistor C7 ACG 004 Ceramic 0 01 150 05 250712 0 C Transistor C8 ACG 004 Ceramic 0 01 150V 06 25 945 R Transistor 9 104K 250 Mylar 0 1 250 2SC1914 F ACG 004 Cerami
33. NAL 5 D POWER 22 FUNCTION EQUALISER 9 3 5 1 M 3 A T 5 ue agak Si RELAY QEF ON ust 22213 Sa TAE DUPLICATE QEE ON An m H D ul 5 MONITOR 1 ON TAPE MONITOR 2 ON 0 24 SI ag L L SOME BE SA TE E SUITS H kad se m Sna Y oy S n sons Ss Prion 2 E Has NG ui 4 eu die EI S FM x 5 20 dimus 217515 4 Wd PHONO 2 MC 2 d long gon 1 ot po o4 cd Sa AUX 8371 3 T 885 E or a FM DE EMPHASIS gt Es 2 s Sm 9 ang 2501885 xa wk en wo aum Hl Fu eec um d a HANS sets ae anap 2 rd pi J a to Sw HIGH FILTER gli DT H jene h Sp BASS TURN OVER 400a 200 LU H 1 Paki Sp TREBLE TURN OVER 25kHg 5 7 E 1 w m Ds Sn TONE QEE ON 1 jb em 1 x ot Ea W SPEAKERS OFE ON H 4 n Rf SPEAKERS 8 JEE ON a gt mmi 81 Ham 2 Ro amp 2 1 x Josascsasa
34. O screw Pan head machine screw Outernal toothed lock washer 3 AN heudimeenipe pba sc Slotted set screw Cone point gt Oval countersunk head e TANE gt SF Slotted set screw Flat point D 5 socket headless set TM head russ head machine screw gt 5 SW zt aj Binding head machine screw a ocw Shl LA pot screw PSA RW vit spring cw Countersunk head wood screw lock washer PSB RW Round head wood screw Gar lock washer and flat washer PSF Pan head screw with flat washer EXAMPLE PM 3x8 FW 90x1 28 length in mm 1 diameter in mm d Symbol thickness in mm 7 diameter in mm d Symbol xcd Q4 11 1 EXTERIOR Parts indigated in green type cannot be supplied Bonnet 066 a aaa Screw ABA 113 IA a ABH 022 Push knob spacer Front panel assembly AEC 258 Gy mg GA Foot assembly ANB 543 Ka 7 022 ES i Lever knob assembly POWER 2 Bottom plate AAD 139 49 Push knob Washer AAD 140 M45 086 NE 4 012 Knob BASS TREBLE Foot assembly AAB 175 ANR 022 Foot assembly song 41 022 Lever knob TAPE MODE LOUDNESS MUTING ABA 012 eae Washer AAD 138 Ja M45 086 Foot assembly Knob BALANCE
35. P 10 Electrolytic 33 10v C5 101P 6 Electrolytic 100 6v Description RESISTORS Symbol Part No Description VRI ACP 006 Semi fixed 470 VR2 ACP 006 Semi fixed 470 R1 RS3P 151 Metal oxide 150 R2 RS3P 151J Metal oxide 150 R3 RD4PS 562 Carbon film 5 6k R4 471 Carbon film 470 R5 5 391 Carbon film 390 R6 204J Carbon film 200k R7 RD PS 303J Carbon film 30k R8 RDAPS 152J Carbon film 1 5k R9 5 562J Carbon film 5 6k R10 RDUPS 471 Carbon film 470 RDAPS 391 Carbon film 390 R12 RDXPS 204 Carbon film 200k R13 RD PS 303 Carbon film 30k R14 152 Carbon film 1 5k R15 RD PS 222 Carbon film 2 2k SEMICONDUCTORS Symbol Part No Description Qi 25 1919 Transistor 25 1312 02 25C1919 G or F Transistor 25 1312 6 01 152473 151555 Diode 02 152473 181555 Diode D3 152473 151555 Diode 04 182473 151555 Diode 05 152473 or 151555 Diode 06 152473 151555 Diode 07 152473 151555 Diode 08 152473 or 151555 Diode D9 152473 151555 Diode D10 152473 151555 Diode 57 1 Speaker Selector Assembly GWS 124 A B 25601919 2 0 0 152473 x D DS 1 58 side Di 152473 o AR a 21 we 2501919 92 30K 0 BV 4 POWER METER L ch pus
36. SX 1080 2 CONNECTION DIAGRAM FM outdoor antenna T type FM antenna PRE POWER CONVENIENCE OUTLETS The bridge connecting plugs between PRE AMP OUT Switched A frequently used component turntable tape and POWER AMP IN jacks always be left in position deck etc can be plugged into this outlet AM outdoor antenna in normal use If they are disconnected or removed no By leaving the power switch of that compo 1 sound will come from the speakers Always be sure to nent in the ON position power supply to the ong switch off the power supply before attempting to re component will be coupled with the receiver move them switch operation Unswitched Less frequently used components which do not require coupled power can be plugged into either of these outlets KA Switched Unswitched Turntabl 1 PHONO 1 Ground Left Right Speaker system SPEAKERS A Turntable 2 2 Tape deck 2 TAPE 2 Cartridge tape player 3 00 80 Tapa dhek 120V TAPE 1 60Hz Left Right Speaker system SPEAKERS B 3 FRONT PANEL FACILITIES POWER METERS These power meters allow you to read out the rated power level when speakers with a nominal impedance of 8 ohms are connected to the receiver s speaker terminals NOTE These values are related to the impedance of the speakers and they v
37. a 47M 33 5 C19 00015 Ris 47M 06 15 Ako 9 Ako Ako Ree 18K 00016 00015 gt 4 2724 00015 Coe 8 18 10000 100 9 Wo Rez 560K 4 AWR 152 No 20 3 8 8 3 5 5 AWT 001 No 23 gt AWT 001 No 24 Ra 22K 100 07 22125 47 35 14196 4 Rer 100 oto 100 10 4 Res 6 8K 18 5V MI GWG 112 No 6 WO GWG 112 No 7 4 GWG 112 No 8 63 41185 47 25 Ri 100K 5578 83 0 Ra1M Rio IM 9 49 Parts List of Tone Amplifier Assembly AWG 056 SWITCHES Symbol Part No Description Symbol Part No Description 51 ASE 105 Rotary slide switch R8 RD PS 105 Carbon film 1M s2 ASE 106 Rotary slide switch R9 RD 4PS 105 Carbon film 1M s3 ASK 144 Lever switch R10 RD PS 105 Carbon film 1M R11 RDXPS 123 Carbon film 12k CAPACITORS R12 RDXPS 123J Carbon film 12k Symbol art Nas R13 RD PS 475 Carbon film 4 7M R14 RD PS 475 Carbon film 4 7M CEANL 4R7P 25 Electrolytic 47 25V R15 RD amp PS 101J Carbon film 100 c2 CEANL 4R7P 25 Electrolytic 4 7 25V c3 CEANL 4R7P 25 Electrolytic 4 7 25V R16 101 Carbon film 100 CEANL 4R7P 25 Electrolytic 47 25V R17 0 682 Carbon film 6 8k C5 203 50 Mylar 0 02 50V R18 RD PS 682 Car
38. angiang aana anaman ra 3 11 4 REAR PANEL NOTE Parts indicated in green type cannot be supplied cord 13 Bar antenna A topper t Bar antenna holder II gl aaa ADG i AEC 327 Jumper plug AKM AC socket AKP 005 erminal GND AKE 031 gu Speaker terminal assembly GWS 128 Ferry inductor 724 030 terminal v 002 Balun T22 025 AKB 035 pam Input terminal assembly GWS 126 Input terminal assembly D GWS 127 35 12 SCHEMATIC DIAGRAMS P C BOARD PATTERNS AND PARTS LIST 121 MISCELLANEOUS PARTS LIST NOTE e Capacitors in uF unless otherwise noted p pF e Resistors in WW unless otherwise noted k ka SWITCH Symbol Part No Description Symbol Part No Description 51 ASK 080 Lever Switch POWER PL3 AEL 067 Pilot lamp with wire AUX 2 ASR uL PL4 AEL 067 Pilot lamp with wire PHONO AEL 069 Pilot lamp with wire STEREO IND TRANSFORMERS AND COILS Symbol Part No Description PL7 AEL 029 Wedge typa pitot lamp Dial scale Y PL8 AEL 029 Wedge type pilot lamp Dial scale Ti T22 025 Balun transformer PL9 AEL 029 Wedge type pilot lamp Dial scale T2 ATB 505 Bar antenna T3 T24 030 Ferry inductor FU1 AEK 302 Fuse 10A T4 ATT 448 Power transformer FU2 AEK 1
39. ary according to the frequency In order to find out the exact output level connect an 8 ohm dummy load instead of the speakers PHONES JACK Plug the headphones into this jack when you want to listen through your stereo headphones Release the all SPEAKERS buttons if you want to listen to the sound through your headphones only This means that all two buttons will be released POWER SWITCH FILTER BUTTONS 15Hz When this button is pressed a 6dB oct atta 6kHz Press this button to provide 6dB oct Flip this switch to the ON position to supply power to the stereo receiver There will be a short delay when it is set to ON because the muting circuit has been actuated to suppress the unpleasant noise that is sometimes generated when the power is switched on and off SPEAKERS BUTTONS FUNCTION BUTTONS Press the function button which corresponds to the pro gram source Turn the VOLUME control down first before selecting a different function button while the sound from one program source is being reproduced EMO Press this button for FM broadcasts The FM STEREO indicators light up when the receiver is tuned into an FM stereo broadcast The sound is automatically received monophonical ly during FM monophonic broadcasts NM ane Press this button for AM broadcasts AUN Press this button when listening to an audio componen
40. ation when the maximum output level is OdB MUTING SWITCH Set this switch to the 204 position to attenuate the audio output indicated by the VOLUME control by 20dB There is no need to adjust the VOLUME control if you use this switch when turning down the audio output temporarily and when changing over records or tapes BALANCE CONTROL Use this control to balance the volume of the left and right channels First however set the MODE switch to MONO and adjust so that the sound appears to come from somewhere exactly between the two speakers If the sound appears to be louder on the right it means that the volume of the right channel is higher Turn the BALANCE control to the left and adjust Conversely if the sound appears to be louder on the left it means that the volume of the left channel is higher Therefore turn the BALANCE control to the right and adjust After adjust ing return the MODE switch to STEREO MUTING BUTTON Release this button to sup press unpleasant inter station noise when tuning in to FM stations Depress this button to pick up weak stations ON released position OFF depressed position FM 25uS BUTTON Press this button when listening to a Dolby FM broad cast otherwise keep this button at the released position FM MULTIPATH BUTTON Use this switch to detect multipath sound when installing the FM antenna in a position which yields the minimum multipath interfer
41. bon film 6 8k R19 RDXPS 6823 Carbon film 6 8k C6 203 50 Mylar 0 02 50V R20 RD PS 682 Carbon film 6 8k 67 203 50 Mylar 0 02 50V C8 203J 50 Mylar 0 02 50V R21 RD PS 564J Carbon film 560k 203 50 Mylar 0 02 50V R22 RD PS 564J Carbon film 560k C10 203J 50 Mylar 0 02 50V R23 RD PS 104J Carbon film 100k R24 RD 4PS 104 Carbon film 100k C11 203J 50 Mylar 0 02 50V R25 RD 4PS 182 Carbon film 1 8k C12 203 50 Mylar 0 02 50V 152 50 Ceramic 0 0015 50V R26 RDAPS 182 Carbon film 1 8k C14 CKDYA 152 50 Ceramic 0 0015 50V R27 RDAPS 101J Carbon film 100 C15 CKDYA 152J50 Ceramic 0 0015 50V R28 RDAPS 101J Carbon film 100 R29 RDAPS 682J Carbon film 6 8k c16 152J50 Ceramic 0 0015 50V R30 RD PS 682J Carbon film 6 8k 017 CEANL 2R2P 50 Electrolytic 2 2 50V C18 CEANL 2R2P 50 Electrolytic 22 50V R31 5 104 Carbon film 100k C19 CEANL2R2P50 Electrolytic 2 2 50V R32 RD PS 104 Carbon film 100k C20 CEANL 2 2 50 Electrolytic 2 2 50V R33 RDAPS 101J Carbon film 100 R34 RDXPS 101 Carbon film 100 21 101P 10 Electrolytic 100 10v C22 CEA 101P 10 Electrolytic 100 C23 CEA 470P 35 Electrolytic 47 35V SEMICONDUCTORS 024 470 35 Electrolytic 47 35V Symbol Part No Description C25 CEANL 2R2P 50 Electrolytic 2 0 50V EU n Q1 25 1919 or G Transistor C26 CEANL 2R2P 50 Electrolytic 22 50V 25 1312 or C27 CCDSL 100F 50
42. c 0 01 D1 10E2 or SIB01 02 Diode C11 CEA 221P 100 Electrolytic 220 100V 02 10 2 SIBO1 02 Diode 12 221 100 Electrolytic 220 100V D3 10E2 or SIBO1 02 Diode C13 CEA 221P 35 Electrolytic 220 35V D4 10 2 51801 02 Diode C15 CEA 221P 80 Electrolytic 220 05 KBPC10 02 Diode C16 CEA 221P 80 Electrolytic 220 80v S15VB20 C17 CEA 470P 16 Electroly tic 47 16v 06 10 2 5 01 02 Diode C18 CEA 470P 16 Electrolytic 47 16V 07 10 2 51801 02 Diode 19 CEA 4R7P 50 Electrolytic 4 7 50V D8 MZ140 or WZ 140 Zener diode C20 CEA 4R7P 50 Electrolytic 47 50V 09 2130 WZ 130 Zener diode C21 CKDYB 471K 50 Ceramic 470p 50V DIO LZ230 Zener diode C22 471K 50 Ceramic 479p 50V 11 2230 Zener diode C23 060 Electrolytic 2200 35V C24 CEA 470P 25 Electrolytic 47 25 C25 470P 25 Electrolytic 47 25V OTHERS Symbol Part No Description RESISTORS ANH 395 Heat sink Symbol Part No Description ANH 203 Heat sink AKR 013 Fuse holder R1 PS2P 103J Metal oxide 10k 2W AKR 030 Fuse holder R2 PS2P 103J Metal oxide 10k 2W R3 RDAPSF2R2J Carbon film 2 2 List of Changed Parts for Factory Modification R4 152 Carbon film 1 5k R5 RD PSF 152 Carbon film 1 5k Symbol Part No R6 RD PSF 152 Carbon film 1 5k R7 152 Carbon film 1 5k R8 RD PSF 2R2J Carbon film 2 2 R9 PS2P 100J Metal oxide 10 2W R10 RD PS 822 Carbon film 8 2k Yaw R11 PS1P 472 Metal oxide 4 7k 1w R12 473J Carbon fil
43. ck AKN 010 LL Lever switch POWER ASK 080 Rotary slide switch TURNOVER ASE 105 Variable resistor BASS TREBLE ACV 136 Rotary slide switch TURNOVER ASE 106 uu 9 8 Push switch FILTER FM ASG 128 GR Lever switch DUPLICATE ASK 145 aka ASK 144 Double meter AAW 075 Push switch FM AM AUX PHONO 2 MIC PHONO 1 ASG 126 Dial shaft assembly AXA 180 MIC jack AKN 012 4 a Lever switch ASK 144 Variable resistor VOLUME ACV 162 Variable resistor BALANCE ACV 190 Lever switch TAPE MODE LOUDNESS SX 1080 5 3 TOP VIEW WITH BONNET REMOVED Power amplifier assembly ACH 085 AWH 071 Power amplifier assembly AWH 071 Power transformer ATT 448 MM M M Sr r i 1 Power supply assembly Tuner assembly AWR 152 AWE 092 Aclylic board ANR 020 13 54 BOTTOM VIEW WITH BOTTOM PLATE Power amplifier assembly Power amplifier assembly AWH 071 AWH 071 Tone control assembly AWG 056 Flat amplifier assembly GWG 112 Tuner assembly Protection assembly AWE 092 AWM 120 14 5 5 REAR PANEL VIEW Antenna terminal AKA 002 Bar antenna ATB 505 Bar antenna holder AXB 012 Terminal GND AKE 031 Input terminal assembly GWS 127 Input terminal assembly GWS 126 SX 1080 4P
44. coil 26 CCDSL 330K 50 Ceramic 33p 50V 4 057 C27 CSZA 1 36 0 1 35V T5 039 matching coil C28 CEA R47P 50 Electrolytic 0 47 50V E 29 CKDBC 4732 25 Ceramic 0 047 25v T6 030 FM detector transformer c30 CKDYF 4032 50 Ceramic 0 04 50V T ATB 13 AM OSC coil c31 CKDYF 403250 Ceramic 0 04 1 018 FM ceramic filter C32 CEA 010P 50 Electrolytic 1 50V F2 018 ceramic filter C33 CKDYF 103250 Ceramic 0 01 50V F3 ATF 018 EM C34 CKDYF 103250 Ceramic 0 04 50V FA ATF 018 FM ceramic filter C35 CSZA 100M 16 Electrolytic 10 16V PS ATF 047 Low pass filter C36 CEA 221P 16 Electrolytic 220 16V F6 ATF 038 455kHz filter C37 CEA 010P 50 Electrolytic 1 50V F7 ATF 034 AM ceramic filter C38 CSZA 010M 25 Electrolytic 0 1 25V c39 CSZA 100 16 Electrolytic 10 16V L1 T24 028 RF choke coil cao CSZA 6R8M6 Electrolytic 6 8 6V L2 T24 028 RF choke coil L3 ATH 014 Micro inductor cai 511750 Styral 510p 50 14 124 028 CSZA 3R3M 16 Electrolytic 3 3 16v 15 T24 028 RF choke coil 2 16 Electrolytic 323 16v 44 CSZA 56 35 Electrolytic 0 56 35V C45 CSZA R56K 35 Electrolytic 0 56 35V CAPACITORS 46 470 10 Electrolytic 47 gay Parte C47 CEA 470P 10 Electrolytic 47 10V 022 Variable capacitor C48 ACE 019 Styrol 880p 4 006
45. ence POWER SWITCH SX 1080 TUNING KNOB Use this to tune in to broadcasting stations Select the station and tune for optimum reception by observing the SIGNAL meter for AM stations and both the SIGNAL and TUNING meters for FM stations SIGNAL METER When tuning in to an AM or FM station the optimum reception position is indicated by the maximum deflec tion of the meter pointer to the right TUNING METER When tuning in an FM station the optimum reception position is indicated when the meter pointer deflects to dead center Check that the SIGNAL meter pointer has deflected as far to the right as possible 981 MEMORY MARKERS These are very convenient for frequent tuning in to the same broadcasting station STEREO INDICATOR This indicator lights up when the receiver is tuned to receive a stereo broadcast TAPE MONITOR SWITCHES 1 2 Set switch 1 to ON with a tape deck which is connected to the TAPE 1 jacks REC and PLAY when you want to monitor the playback or recording of a tape The tape on a deck which is connected to the TAPE 2 jacks REC and PLAY can be similarly monitored by setting switch 2 to ON NOTE Set these switches to the upper off position when listening to records or the broadcast Dar WPIONEER STEREO RECEIVER SX 10B0 MODE SWITCH Use this switch for selecting mono or stereo performances STEREO S
46. er employs a 2 stage variable capaci tor one IC HA1197 and one AM ceramic filter Its block diagram is given in Fig 4 HA1197 is an IC containing an RF amplifier converter 2 stage IF amplifier detector and AGC circuit and features excellent AF frequency response and distortion Q of the output circuit is a special AM muting circuit This circuit is operated until the AM tuner stabilizes immediately after the FUNCTION AM switch has been set to ON The instant the AM switch is set to ON is supplied to thru and the base of Q is forward biased Consequently Q is turned ON and the AM output signal is shorted to ground during the time constant of 8 2 PHONO MIC INPUT CIRCUIT PHONO 1 PHONO 2 MIC input switching is performed by the switch and the MIC jack When a microphone plug is inserted into the MIC jack the input is switched to MIC at both the L and R channels Since the IC HA1457 is used as both a microphone amp and equalizer amp a circuit having a reverse RIAA curve is provided at the MIC input circuit to obtain a flat frequency response Ceramic filter 8 3 FLAT AMPLIFIER The power amplifier is an all stage direct coupled circuit It amplifies the signal to the required level and sends a low impedance signal to the tone control circuit 8 4 TONE CONTROL The tone control circuit is an NFB type inserted in front of the power amp Bass turnover 200Hz lt gt 400Hz and treble
47. et to this position for normal stereo opera tion MONO When set to this position the left and right channel signals will be mixed and reproduced monophonically from both speaker systems TAPE DUPLICATE SWITCH Set this switch to ON when you want to duplicate or edit a pre recorded tape using two tape decks The word Dolby is a trademark of Dolby Laboratories Inc 4 DISASSEMBLY 1 Remove screws and remove the bon net 2 Remove screws all the knobs and remove the two nuts and two washers at the front panel However loosen the set screws with the accessory allen wrench before at tempting to remove the TUNING and VOL UME knobs 3 Remove screws and remove the bot tom plate Front panel Knob TUNING Knob VOLUME 10 5 PARTS LOCATION 51 FRONT PANEL VIEW Front panel assembly ANB 543 Push knob SPEAKERS FILTER FM AAD 140 Lever knob assembly POWER AAD 139 Knob BASS AAB 175 Lever knob TONE AAD 138 Knob TREBLE AAB 175 SX 1080 Push knob FM AM AUX PHONO 2 MIC PHONO 1 AAD 140 Knob TUNING AAA 047 Lever knob MUTING AAD 138 Knob VOLUME AAB 174 Knob BALANCE 176 Lever knob DUPLICATE MONITOR 1 2 MODE LOUDNESS AAD 138 11 52 FRONT VIEW WITH FRONT PANEL Power meter AAW 074 Dial pointer assembly AAF 065 Push switch SPEAKERS ASG 133 Headphones ja
48. input terminal of an oscilloscope and tuner ass y terminal 13 to the vertical axis input Set the SX 1080 dial pointer to 98MHz and adjust the FM signal generator so that the tuning meter deflects to the center of the scale Adjust VR so that a Lissajous pattern is traced on the oscilloscope Fig 13 Modulate the MPX SG at L R 1kHz to deviate the 67 5kHz pilot signal 19kHz 7 5kHz Adjust T for minimum L channel or R channel distortion However within 90 of the core adjustment range Make the MPX SG main signal L or R and adjust VRa for best separation Next set the MPX SG to 7 5kHz by pilot signal 19kHz Adjust VR 5 for minimum output aT QvR No 137 VR E Terminal 5 1080 Terminal lt TAPE REC ANTENNA SX 1080 Fig 13 Lissajous pattern AC voltmeter Distortion meter IN EXT MOD Fig 12 Connection of FM MPX adjustment 25 9 4 POWER AMPLIFIER Center Voltage Adjustment 1 Connect a DC voltmeter between power ampli fier ass y AWH 071 L ch terminal 10 and ground 2 Check if the voltage between terminal 10 and ground is OV adjust to OV with VR 3 When OV cannot be obtained by performing the adjustment of item 2 above cut the jumper wire shown in Fig 14 and adju
49. k diagram of power amplifier is Q temperature compensation transistor which prevents changes in the center voltage due to the temperature characteristic of Q Since the output center voltage is applied to the feedback side base of Q by and the input side base potential of Q becomes the standard Therefore the input side base potential of must be main tained constant at OV The voltage generated across R by input side base current of Q is cancelled by the base current of Q to maintain the input side base potential of Q constant at OV 8 6 METER AMPLIFIER In order to indicate the 0 01W 120W range with one meter without range switching a loga rithmic indication type meter must be employed and the input signal must be logarithmically compressed The meter amplifier circuit is shown in Fig 6 This circuit consists of a logarithmic compres sion circuit and a meter drive circuit The output signal of the power amplifier is applied to the logarithmic compression circuit and its dyna mic range is compressed The principles of the logarithmic compression circuit are given in Fig 7 The output voltage of this circuit is the value divided by and Z The attenuation at low signal input is reduced and the attenuation at large signal input 5 increased by using the rise of the diode current voltage characteristic at 7 The compressed signal is shaped by and applied to Q of the meter drive circuit
50. m 47k R13 RD PS 153J Carbon film 15k R14 RD PS 153J Carbon film 15k R15 RD PS 513 Carbon film 51k R16 R17 R18 5 121 Carbon film 120 Yaw R19 RD PS 622 Carbon film 6 2k 69 12 12 TERMINAL ASSEMBLY GWS 126 REC MONITOR MONITOR 1 Vas MONITOR PLAYBACK m TA MONITUR 2 Foil side Parts List RESISTORS Symbol Part No Description R1 RD PM 222 Carbon film 2 2k R2 RD 4PM 222 Carbon film 2 2k R3 RD PS 222 Carbon film 2 2k R4 RD PS 222 Carbon film 2 2k OTHER Symbol Part No Description AKB 027 4P pin jack TAPE T 8 TAPE MONITOR RIK owo PLAYBACK ae Ud F H 1 f f A GWG 112 No 1 2 GWG 112 H GWG 112 J GWG 112 No G GWG 112 0 5 GWG 112 GWG 112 No F GWG 112 No WS 127 12 13 TERMINAL ASSEMBLY GWS 127 Foil side Rang Part List Symbol Part No Description GWS 125 No AKB 028 6 pinJack 70 GWS 125 GWS 125 No L GWS 125 No F GWS 125 No GWS 125 No 0 5 GWS 125 GWS 125 GWS 126 No C 711 SX 1080 12 14 SPEAKER TERMINAL ASSEMBLY GWS 128 Foil side GWS 124 De SPEAKER GWS
51. ms or 150 watts per channel at 4 ohms from 20 Hertz to 20 000 Hertz with no more than 0 0596 total harmonic distortion Total Harmonic Distortion 20 Hertz to 20 000 Hertz Continuous Rated Power Output No more than 0 05 60 watts per channel power SOT 2 2222 No more than 0 0296 1 watt per channel power OUtpUL BIO TIS KN Nsa No more than 0 0296 Intermodulation Distortion 50 Hertz 7 000 Hertz 4 1 Continuous Rated Power Output No more than 0 0596 60 watts per channel power outputs No more than 0 0296 1 watt per channel power output sohms No more than 0 02 Frequency Response 5 Hertz to 100 000 dB Input Sensitivity Impedance SEEN Pa tenes 1V 50 kilohms Output carte ewan A B Damping Factor 20 Hertz to 20 000 Hertz 8 ohms 30 Hum and Noise IHF short circuited Network 100dB Preamplifier Section Input Sensitivity Impedance PHONO tenir RETI 2 5mV 50 kilohms MIC Is ar ariel e 7 5mV 50 kilohms 2 150mV 50 kilohms na e Pn 150mV 50 kilohms 2525 tact a 150mV 50 kilohms PHONO Overload Level 1kHz T H D 0 0596 PHON OSTEA r a a 200mV Output Level TAPE REC Tanan aaa EAR 150mV TAPE RECA TN Si 150mV PRESDUTE Kasa UNI kilohms Total Harmonic Distortion 20Hz
52. n at 90MHz and 106MHz is perfect At this time adjust T for maximum output 3 19 Terminal Fig 10 FM ANTENNA 10 31 12 13 Terminal Adjust primary core bottom of so that the pointer of the tuning meter deflects to the center of the scale in the untuned state noise only Set the FM signal generator output to 664 set the SX 1080 dial pointer to 98MHz and tune the FM signal generator at the tuning meter Pointer of tuning meter deflects to the center of the scale Adjust the secondary side top of minimum distortion Repeat steps 8 10 until the minimum distor tion point does not change Set the FM signal generator output to 1004 and adjust VR for maximum deflection at the signal meter Fig 11 4 Set the FM signal generator output to 264 Set the MUTING switch to ON and adjust so that the output waveform disappears for Fig 11 Meter deflection AC voltmeter Distortion meter Connection of FM tracking adjustment 9 3 Connect as shown in Fig 12 and the FUNC TION switch to and the MUTING switch to OFF Set the FM signal generator to 98MHz un modulated 669 output Connect the output of the MPX SG PILOT OUT terminal to the horizontal axis
53. oise Figure high PG Power Gain and low feedback capacitance The mixer is also a dual gate MOS FET The re ception signal is applied to gate 1 and the local oscillator signal is applied to gate 2 This ciurcuit has low local oscillator signal injection power and the strong reception signal has little effect on the local oscillator The local oscillator is a modified Clapp circuit Its output signal is injected into the mixer thru a J FET buffer IF Amplifier Four dual element ceramic filters are used as the selection elements and one IC TA7302P contain ing two differential amplifiers and one FM IF IC PA3001 A are used as the amplification elements The TA7302P compensates for the filter inser tion loss and also limits the amplitude of the FM signal The PA3001 A performs IF amplification amplitude limiting and FM detection It also drives the TUNING and SIGNAL meters and controls muting The block diagram of the PA3001 is given in Fig 1 Input Level Muting ov 5 Switch Sira SONAS tm Muting Level Adjust Muting Switch Fig Block diagram of PA3001 A 19 FM Multiplex Decoder The FM multiplex decoder is a PLL Phase Locked Loop MPX IC PA1001 A Its block diagram is given in Fig 2 PA1001 A contains a PLL VCO circuit double balance type differential demodulator with NFB amplifier and pilot auto cancel circuit to improve the distortion characteristics frequency resp
54. onse and S N The nonlinear distortion produced at the de modulator has been improved by adding the NFB amplifier to the double balance type differential demodulator The pilot auto cancel circuit eliminates carrier leakage 19kHz without a loss of demodulated signal frequency response Moreover since the cancel signal level tracks the inpup pilot signal level the rejection ratio does not drop even if the input pilot signal level changes Sub Corrier Switch Pilot STEREO MONO Leve Auto Switch Detector Circuit STEREO ind Fig 2 Block diagram of PA1001 A FM Output Amplifier The FM output amp is an IC 1002 PA1002 A contains an AF amp muting gate circuit and power ON OFF muting control circuit Its block diagram is given in Fig 3 The AF amp is a differentially coupled NFB amp featuring excellent dynamic range S N and distortion characteristics de emphasis characteristic is obtained by providing a frequency selection characteristic at the NFB loop of this amp The muting circuit electronically grounds the signal circuit when a control voltage of 1 4V or greater has been applied to pin 8 of the PA1002 A This control voltage is applied from pin 12 of the PA3001 A thru the MUTING switch A 1 4V DC voltage is generated at pin 12 of the PA3001 A when de tuned more than 70kHz and at weak inputs antenna input conversion 5uV or less Fig 3 Block diagram of PA1002 A AM Tuner The AM tun
55. otection Assembly AWM 120 List of Changed Parts for Factory Modification Description CAPACITORS Symbol Part No Description 221 35 Electrolytic 220 35V 2 101 16 Electrolytic 100 16V 100 16 Electrolytic 10 16v C4 470 16 Electrolytic 47 16v C5 CEA 470P 16 Electrolytic 47 16v C6 CEA 010P 80 Electrolytic 1 80V RESISTORS Symbol Part No Description R1 RD PS 132J Carbon film 1 3k R2 RD APS 133J Carbon film 13k R3 RS2P 182J Metal oxide 1 8k 2W R4 821 Carbon film 820 Yaw R5 RD PS 753J Carbon film 75k R6 RD PS 753 Carbon film 75k R7 RD PS 113J Carbon film 11k R8 5 474 Carbon film 470k R9 RS1P 332 Carbon film 3 3k 1w R10 5 751J Carbon film 750 R11 ACN 019 Cement 3 3 20W R12 RS2P 222 Metal oxide 2 2k 2w R13 RDAPS 152 Carbon film 1 5k R14 RD APS 103 Carbon film 10k R15 103 Carbon film 10k SEMICONDUCTORS Symbol Part No Description 01 2SA733 Q Transistor 25 904 02 25 1438 Transistor 2SC1915 E or F 03 PA3004 IC D1 2 130 or WZ 130 Zener diode D2 182471 Diode D3 182471 Diode OTHERS Symbol Part No Description ASR 048 Relay ASR 046 Relay 1 001 Temperature sensitive fuse 74 SX 1080 13 PACKING Vinyl bag AHG 027 Side pad AHA 176 Operating instructions ARB 239 Vinyl bag 024 Sheet 083 gt Side pad
56. rbon film 10k C5 CSZA 010M 25 Electrolytic 1 25V R30 RD14PS 103 Carbon film 10k C6 CSZA 010M 25 Electrolytic 1 25 R31 RD PS 101 Carbon film 100 CCDSL 560K 50 56p 50V R32 RDAPS 101J Carbon film 100 C8 CCDSL 560K 50 Ceramic 56p 50V C9 CCDSL 680K 50 Ceramic 68p 50V C10 CCDSL 680K 50 Ceramic 68p 50V SEMICONDUCTORS Symbol Part No Description CCDSL 100 50 Ceramic 10p 50V 12 CCDSL 100 50 Ceramic 10 50V 01 2SK34 C or D FET C13 CEANL 101P 10 Electrolytic 100 10V 2SK68A L or M C14 CEANL 101P 10 Electrolytic 100 10V Q2 25 34 or D FET C15 CEANL 101P 10 Electrolytic 100 10V 28K68A L or M 2 2SA726S F 6 Transistor 16 CEANL 101P 10 Electrolytic 100 10V 2SA872A D 17 101 25 Electrolytic 100 25V Q4 2SA726S F or G Transistor C18 CEA 101P 25 Electrolytic 100 25V 2SA872A D or C19 CEANL 4R7P 25 Electrolytic 4 7 25 C20 CEANL 4R7P 25 Electrolytic 4 7 25V i aga M List of Changed Parts for Factory Modification RESISTORS Deseribtion Symbol Part No Description VR1 ACV 162 Variable resistor 100k VR2 ACV 190 Variable resistor 250k 85 RD 4PS 472 Carbon film 4 7k R6 RD PS 472 Carbon film 4 7k R7 RD PS 473 Carbon film 47k R8 RD PS 473 Carbon film 47k R9 RDPS 6221 Carbon film 6 2k R10 RDHPS 622 Carbon film 6 2k RD amp PS 6221 Carbon film 6 2k R12 RDPS 622J Carbon film 6 2k R13 RD PS 683 Carbon film 68k R14 RD PS 683 Carbon film 68k R15 RDAXPS 101J Carbon
57. st to OV with 4 Thr R ch also uses power amplifier ass y AWH 071 Check and adjust this channel in accordance with items 1 3 above Idle Current Adjustment 1 Connect a DC voltmeter between terminals 13 23 of the power amplifier ass y AWH 071 L ch side 2 Set the power switch to ON wait 10 minutes and then check if the DC voltmeter reads 30mV If it doesn t read 30mV adjust to 30mV by turning VR 3 The R ch also uses the power amplifier ass y AWH 071 Check and adjust this channel in accordance with items 1 4 above Fig 14 Power amplifier adjustment 9 5 METER AMPLIFIER 1 Push speaker selector switch button 2 Connect an AC voltmeter to speaker output terminal 3 Apply a 1kHz sine wave to the input terminals and adjust the input for an AC voltmeter reading of 31V 4 Adjust VR L and VR R for a meter indication of OdB as shown in Fig 15 Top view with bonnet removed Power supply assembly VR VR Meter amplifier Front panel Fig 15 Meter adjustment 26 SX 1080 10 DIAL CORD STRINGING Remove the bonnet and front panel as des in Disassembly on page 10 Loosen screws 6 and remove the blind sash as shown in Fig 16 1 the front end variable capacitor shaft fully clockwise Vanes of capacitor fully inside 2 Tie one end of the string to the peg on
58. t KA nsa NAAN ate a Vig ac claus ain EE E SA doo 855 PONa AONE rer ton Meto AMBOS 1 9 9 deo renim alam PALASO e ele ecg TEE Protection raul E Power Supply dra 9 10 12 13 ADJUSTMENT TAINO 598 22 Rat teas ra EI e vla O 23 8 2 BUBUO DOR T TEES S 24 ONG 25 9 424 Power mplifar ens bats es LAGA 26 CLAN KAB AA AA NG 26 ERA MEUS IBI S non NAA 27 EXPLODED VIEWS 22 44 spokes a digi c 28 111 05330505 54442 29 112 Component of Panti Stay AK OY 31 Sea NA TOO INE COE 33 KA BTANA des au a PANA GTA TAPANG 35 SCHEMATIC DIAGRAMS BOARD PATTERNS AND PARTS LIST 124 Miscellaneous Parte 01870008 TAN TE 36 12 7 Scharriatios I RE
59. t connected to the AUX input jacks wm Dra Press the button corresponding to the speakers connected to the SPEAKERS terminals A B on the rear panel You can press two of these buttons to listen to sound from two pairs of speaker systems at the same time BASS TURNOVER SWITCH Use this switch to change over the frequency in which the sound adjustment with the BASS control is starting to take effect Select 200Hz or 400Hz in accordance with the characteristics of your listening room and of your speakers and with your general preference TONE SWITCH Set this switch to ON when adjusting the BASS and TREBLE controls In the OFF position it causes the amplifier to operate with a flat frequency response BASS AND TREBLE CONTROLS Use these controls to adjust the bass and the If you set the TONE switch to ON and turn the control to the right from its center position you willl able to emphasize the sound in a frequency range whi lower than that selected by the BASS switch Conversely turning this control from the cd position to the left will attenuate the sound You can use the TREBLE control to adjust the sound frequency higher than that selected by the TREBLE TURNOVER switch ee 66 Spe 6666 MODO BALANCE LOUDNESS SWITCH Set this switch to ON when listening at a low volume The frequency response of
60. the human ear varies according to the listening volume and setting this switch to the ON position compensates for hearing response by emphasizing the bass and treble L TREBLE TURNOVER SWITCH Use this switch to change over the frequency in which the sound adjustment with the TREBLE control is starting to take effect Select 2 5kHz or 5kHz in accordance with the characteristics of your listening room and of your speakers and with your general preference PHONO 2 Press this button when playing a record on the turntable connected to the PHONO 2 jacks or when using a microphone which you have plugged into the MIC jack PHONO S Press this button when playing a record on the turntable connected to the PHONO 1 jacks NOTES 1 Unplug the microphone from the MIC jack when you do not intend to use the microphone otherwise you will not be able to use the PHONO 2 jacks 2 Only one function button should be pressed at a time JACK Plug your microphone into this jack The microphone signals are reproduced in mono through the left and right speakers NOTE A high impedance approx 50 kilohms dynamic type microphone with a standard plug can be connected to this jack VOLUME CONTROL Use this control to adjust the output level to the speakers and headphones Turn it clockwise to increase the output level No sound will be heard if you set it to ee The scale is graduated in dB which indicate the attenu
61. the voltage difference generated across Q will become forward biased and consequently turn on A DC voltage will then be applied to pin no 4 turning 5 on and resulting in the rapid discharge of Ct and 5 and Qr both turning off The relay will again be released to disconnect the output circuit 8 8 POWER SUPPLY The power amplifier and power stage plus and minus supply voltages 62V are obtained by means of a bridge full wave rectification system 22000 71 x 2 electrolytic capacitors are used Plus and minus voltages are supplied to the small signal circuit of the AF Section thru a constant voltage circuit by full wave rectification from a winding separate from the power stage supply Tuner section lamp circuit and protection circuit power is supplied thru transistors Darlington con nected ripple tilter after full wave rectification a Positive half cycle bridge Fig 8 2 b Negative half cycle bridge 9 ADJUSTMENT 9 1 AM TUNER Confirm that the dial pointer is at the start point Connect as shown in Fig 9 and set the FUNCTION switch to AM Set AM signal generator to 400Hz 30 modulation 30dB output at no input from AGC Set the AM signal generator and the SX 1080 dial pointer to 600kHz and adjust T for max imum output Set the AM signal generator and the SX 1080 dial pointer to 1400kHz and adjust TC for maximum output Repeat steps 2 and 3 until reception is perfect at
62. turnover 2 5kHz lt gt 5kHz switches and a tone defeat circuit which bypasses the tone control circuit to obtain a flat characteristic are provided in addition to variable resistor which adjusts the rise and fall 8 5 POWER AMPLIFIER The power amplifier is an all stage direct coupled pure complementary OCL circuit having a differen tial amplifier at the first stage current mirror cir cuit at the predriver stage and a parallel push pull amplifier at the final stage Fig 5 The first stage Q is a PNP type dual transistor differential amplifier that amplifies the input signal and stablizes the center voltage of the power stage and Qu are driven by the opposite phases of the output of Q The output of Q is applied to the current mirror circuit consisting of D and Q and phase inverted Consequently and are in phase signals and are operated as a push pull pre driver Low distortion and improved rise charac teristic at high amplitudes have been realized by making the predriver stage push pull Overcurrent is detected and destruction of the power transistor prevented by The final stage is a parallel connected power amplifier FUNCTION AM switch OUT AGC line i SIGNAL meter Fig 4 Block diagram of AM tuner 2o SX 1080 04B2 62V Protection Assy 81C60V o Ta OUT o B 62V Fig 5 Bloc
63. ugh the relay coil to activate the relay and close the connection in the output circuit The time required for this connection to close after the power supply is first turned on is several seconds During this period any unwanted transient noises will be therefore muted When the power supply is turned off the input AC applied to pin no 7 ceases immediately resulting in S turning on Ct discharging rapidly and S and Qr both turning off The relay is thus opened disconnecting the output circuit Constant current source 9 52 IC PA3004 Leod Speaker Power amplifier 5 Fig 8 1 Schematic diagram of protection DC Voltage Detector Fig 8 1 The output circuit is connected to pin no 4 via a low pass filter Rg and Any DC voltages appearing in the output circuit will also be applied to pin no 4 turning 8 on Ct will thus discharge rapidly turning 5 and Qr off thereby releasing the relay and disconnecting the output circuit from the load Overload Detection The overload detector circuit incorporates the load RL in one side of a Wheatstone bridge see Fig 8 2 The base and emitter of a sensing transistor Q are connected to the opposite corners of the bridge so if RL decreases Q will become forward biased If RL falls below a pre scribed value Q will turn on thereby passing a current through and R Due to

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