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Pioneer SX-1080 User's Manual

Contents

1. 3 na neta en nono ete ana 8 5 80 808 Ba Pro tecHOIV CORRER 88 9 ADJUSTMENT polas A 23 BE esa ses E 24 25 aa 26 26 IB CORDS FRINGING S o r WES aa 27 VIEWS L 28 29 Component or 31 NU NTEGER gt 33 35 12 SCHEMATIC DIAGRAMS P C BOARD PATTERNS AND PARTS LIST 123 Miscellaneous Parts Bist MES es m d SERE 36 12 2 Schematic Diagram PUN a LN RE A KS CR PER 39 Tunsr Assent DIV AWE OOP 41 124 Power Transistor Connector Assembly 125 47 125 Tone Control Assembly 056 48 12 6 Ela Amplifier Assembly 55 52 a iei sss 51 12 7 Power Amplifier Assembly
2. 1 2k RS 2 122 Metal oxide 1 2k 5 Symbol Part No Description C1 1042 25 Ceramic 0 1 25V C2 1042 25 Ceramic 0 1 25 1042 25 Ceramic 0 1 25 C4 CKDBC 1042 25 Ceramic 0 1 25V C5 ACG 001 Ceramic 0 01 250V C6 ACG 003 Ceramic 0 01 125 C7 ACH 085 Electrolytic 22000 71V c8 ACH 085 Electrolytic 22000 71V C9 CEA 010P 80 Electrolytic 1 80V SEMICONDUCTORS Symbol Part No Description 01 250737 or Transistor 02 250737 Transistor 03 2SB701 A B Transistor 04 25 701 C Transistor 05 2SD737 A B or Transistor Q6 250737 or Transistor Q7 258701 C Transistor 08 258701 Transistor LAMPS FUSES Symbol Part No Description PLI AEL 069 Pilot lamp with wire FM PL2 AEL 067 Pilot lamp with wire AM 36 Symbol Part No Description PL3 AEL 067 Pilot lamp with wire AUX PL4 AEL 067 Pilot lamp with wire PHONO PL5 AEL 069 Pilot lamp with wire STEREO IND PL7 AEL 029 Wedge type pilot lamp Dial scale PL8 AEL 029 Wedge type pilot lamp Dial scale PLO AEL 029 Wedge type pilot lamp Dial scale FU1 AEK 302 Fuse 10A FU2 AEK 104 Fuse 1 5A FU3 AEK 106 Fuse 1A FUA AEK 106 Fuse 1A 205 106 FU6 AEK 106 Fuse 1A OTHERS Symbol Part No Description AWE 092 Tuner assembly GWS 125 Function and equalizer assembly GWG 112 Flat amplifier assembly AWG 056 Tone con
3. 5 FUNCTION EQUALIBER 993 15 S RELAY ON S4 DUPLICATE QFE ON 5 MONITOR 1 OFF ON Ss 5 e ae gt PRE 0UT 0s 23 063 JAN queris MONITOR 2 OFF ON E n MONO are STEREO MoN 59 OFF ON 2 5 OFF QN 5 PHONO OFF ON dug LA Sp PHONO 2 MIC OFF D AUX 5 DE EMPHASIS Tus 2545 95 FM MUTING OFF QN Sw FM MULTIPATH QEE CN INS LOW FILTER OFF 15 Sy HIGH FILTER OFF 6kHz Sw BASS TURN OVER 400Hg 200HE 5 TREBLE TURN OVER 25kHg 5 n QFE ON 5 SPEAKERS A OFF ON SPEAKERS B ON 1 6 FLAT AMP ASS y GWG 2 INPUT TERMINAL E 8 8 126 7 FILTER 001 2 0 152471 Q 254133 Q 2801438 0 004 95 gt BE 40 12 3 TUNER ASSEMBLY AWE 092 f f eran FM T o 2 5 23 12 1V pal Uh iu cd Li 2 2yH B 90 120 025 MULTI 52 O10 MUT AUTO OUT R2 5 QIS STEREO IND 3 i 924 AUTO IN a Lo 2 5 e 5 RECO
4. GWS 124 No B GWS 124 GWS 124 Parts List Symbol Part No Description AKE 029 Push terminal C LA 1 12 15 PROTECTION ASSEMBLY 120 R318K D3 152471 O zl 22 012095 13V g 02 182471 41 2SAT33 22 2SCI438 PA3004 13V Di MZ 130 72 5 1080 3 A AC 120 60Hz T Power transformer QW 152 No 19 AWR 152 No 1 779 Foil side 0 0 oo AAA 0 7 256438 8 13 Cs 5 2 y 254133 4706 Qu CN 4 13V 2 1 2 Da 152471 2 o 2219 T aie 100 16 3 d 2 7 k ku C Aym a vases Hive 0 S dk OV 22 TF As TM 2 21 4 m ERE Fe 27 6 2430 5 15247 11 e gt GWS 124 No 5 gt AWR 152 No 16 ihe gt GWS 125 No 26 092 No 30 STEREO IND On 092 No 15 071 No 10 GWS 124 2 GWS 124 1 AWH 071 No 10 071 No 2 Ll ecc E D gt AWH 071 No 1 L AWR 152 No 27 AWR 152 No 14 7 Parts List Protection Assembly 120 CAPACITORS List of Changed Parts for Factory Modification Symbol Part No Description Description C1 CEA 221P 35 Electrolytic 220 35V G2 CEA 101P 16 Electrolytic 100 16 C3 CEA 100P 16 Electrolytic 10 16
5. STEREO RECEIVER 1080 SERVICE MANUAL MODEL SX 1080 COMES IN FIVE VERSIONS DISTINGUISHED AS FOLLOWS Voltage Remarks 5 10680 120 0 5 120 only 220V 240V Switchable Europe or Oceania model 110V 120 220V and 240 Switchable General export model 110V 120V 220V and 240V Switchable U S Military model NOTICE This service manual is applicable to the SX 1080 KU e The SX 1080 HG S G S KC service manual is issued as an appendix CONTENTS 1 ERN a RR o 3 PRONTIPANEL FACILDITIES corsare A DISASSEMBLE 7 TEE rara e 5 PARTS LOCATION 5712 Front Rahal MIBWI 247228 au eee a 52 Front View with Front Panel Removed 5 3 View with Bonnet 5 4 Bottom View with Bottom Plate Removed 5 5 Panel View n ie Ne a dE e 6 XEEVEL DIAGRAM T VABUDOKIDIAGRAM 225268 5 3 8 CIRCUIT DESCRIPTIONS 8293 iphone Mie maur 5
6. 4 TREBLE HEADPHONES METER 522 SPA Ms a a a a ae us ZUR A S ca POWER AMP IN 1 PRE OUT Sn INO POWER SUPPLY FM AUX PHONO P PROTECTION Assy METER 13V TONE CONTROL 33V METER AMP 13V EQUALIZER APOWER 23 EQUALIZER 8 POWER AMP 23V POWER 60V PROTECTION 8 POWER AMP 60V PROTECTION Assy POWER AMP 62V POWER AMP 62V CEAC 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 in the tuning circuit dual MOS FETs at the RF amplifier and mixer and a local oscillator with J FET buffer The front end input is 75 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 Noise 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 oscillato
7. aei cs A 0815 Y 152473 Re _ zu m lt 2 me HOM 5 NI y oH 9 A 046 1 150 d o o v ISOK 9125 9 Has 40K 313 18 15 16 5 4 s ES 1118 Ph3001 A f 20k vq epe fm D ES 25 Pr ae tee AE Sw i ATA 1 19 3 UN DE ue 5 LE x 1 813 Dro 517 is 3i 18 my S 52 2 5 25 TA 25 29 Raso 375 5 5 Q 121 5 26 4 29 ul AWT 001 No 2 GWS 125 No 25 m ur AWT 001 No 14 GWS 125 No 28 p 750 1 4 7 gt GWS 125 No 30 AWT 001 No 13 FuNING METER 300 GWS 125 No 23 AWT 001 No 16 I terminal da Parts List Tuner Assembly AWE 092 TRANSFORMER COILS AND FILTERS Symbol Part No ATI 021 2 015 T3 ATC 016 T4 ATC 057 T5 ATE 039 T6 ATE 030 T7 013 018 2 018 018 F4 018 5 047 038 7 034 L1 T24 028 ig T24 028 L3 ATH 014 L4 T24 028 L5 T24 028 CAPACITORS Symbol Part No vC ACK 022 4 006 Ci CCDTH 150K 50 C2 CCDSL 101K 50 C3 CKDYF 1032 50 C4 CCDSL 020C 50 1032 50 C6 1032 50 C7 CCDTH 180K 50 CCDTH 180
8. gt 11 EXPLODED VIEWS The following symbols stand for screws washers and nuts as shown in exploded view Description Description Brazier head tapping screw E type washer Pan head tapping screw Flat washer Binding head tapping screw Countersunk head tapping screw Spring lock washer Nut Truss head tapping screw Washer faced nut Oval countersunk head tapping screw Pan head machine screw Internal toothed lock washer Outernal toothed lock washer Countersunk head machine screw Oval countersunk head machine screw Truss head machine screw Slotted set screw Cone point Slotted set screw Flat point Hexagon socket headless set screw Binding head machine screw Pan head screw with spring lock washer Pan head screw with spring lock washer and flat washer Oval countersunk head wood screw Countersunk head wood screw Round head wood screw Pan head screw with flat washer EXAMPLE PM 3x8 length in mm 1 diameter in mm d Symbol 7 diameter in d Symbol sxX 1080 11 1 EXTERIOR NOTE j 8 Parts indi ated in green type cannot be supplied Bonnet 066 Screw ABA 113 ABA 113 Screw ABA 064 Push knob AAD 140 Coil spring ABH 022 Push knob spacer See page 31 E Front panel assembly AEC 258 DMA lt Foot assembly ANB 543 SNG ANR 022 rep
9. Input terminal assembly GWS 127 Input terminal assembly GWS 126 5 1080 socket 005 ADG 013 Speaker terminal assembly GWS 128 15 6 LEVEL DIAGRAM AUK G PHONO 1 2 FLAT TuS POWER amp Mc Hed 2 ua 0 4 31V 80 LOSS 0 8dB 150mV AUX 0 dBv 1V Frequency 1 kHz E 7 BLOCK DIAGRAM L ch AUX 1 5 2 512 i MIC R ch 51 971 PHONO 2 AUX T am CF 7302P A Su 9 o EQUALIZER SWITCHES 1 POWER ON OFF 16 FM MULTIPATH S2 RELAY ON OFF 17 LOW FILTER 53 DUPLICATE ON OFF Sis HIGH 54 1 ON 519 BASS TURN OVER 55 MONITOR 2 ON OFF 20 TREBLE TURN OVER 56 MODE STEREO MONO 521 57 MUTING 20d8 OFF 22 SPEAKERS 58 LOUDNESS ON QFF 523 SPEAKERS 59 ON OFF 510 FM QN OFF S PHONO 1 ON 312 PHONO 2 0 QFE 13 AUX ON OFF 514 FM 5E EMPHASIS 751 25 5 515 MUTING ON OFF MPX H 2 PLAY REC PLAY Q o REC PLAY REC PLAY 11 2 ON 5 OFF 6kHz OFF 200 4008 5kH2 2 5kHz ON QFF ON ON OFF 8 1080 5 2 METER VR 1 BALANCE pe Ae s VR VOLUME VR 3 BASS TONE CONTROL
10. 071 54 12 8 Speaker Selector Assembly GWSA24 res 57 12 9 Function Equalizer Assembly GWS 125 ei 60 12 10 Enter sNssembly AW TOOT ios rate RR ARE E Ee e a 24 64 1211 Power Supply Assembly 152 66 12 12 Terminal Assembly Renee aa an 70 12 13 Terminal Assembly 4 25752225225 Ew S e UR cles a w 70 12 14 Speaker Terminal Assembly 5 128 71 12 15 Protection Assembly 72 L eque REI S PAP IUS hod y ass 75 1 SPECIFICATIONS Semiconductors suns 5 ater 5 8 RAL 1 x Sia AN 36 Diodes 225 55 2 n 42 Power Section Continuous power output of 120 watts per channel min at 8 ohms or 150 watts per channel at 4 ohms from 20 Hertz to 20 000 Hertz with no more than 0 05 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 Output SIDhITISC No more than 0 0296 1 watt per channel power output 2 4 more than 0 02 Intermodulation Distortion 50 Hertz 7 000 Hertz 4 1 Continuous Rated Power
11. 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 iempting to remove the TUNING and VOL UME knobs 3 Remove screws and remove the bot tom plate Front panel Knob TUNING Knob VOLUME 70 5 1080 5 5 LOCATION 5 1 FRONT PANEL VIEW Push knob FM AM AUX PHONO 2 MIC PHONO 1 Front panel assembly ANB 543 AAD 140 Knob TUNING AAA 047 Push knob SPEAKERS FILTER FM AAD 140 Lever knob MUTING AAD 138 Lever knob assembly POWER AAD 139 A m A aita HH 55 om 606 oM of Wes mban m ta ME p alt y o DESI SAU ota mvomeere BASS ET E VOLUME AAB 175 AAB 174 Lever knob TONE Knob BALANCE AAD 138 AAB 176 Knob TREBLE Lever knob DUPLICATE MONITOR 1 2 AAB 175 MODE LOUDNESS AAD 138 5 2 FRONT VIEW WITH FRONT PANEL REMOVED Power meter 3 060015 meter AAW 074 AAW 075 Push switch FILTER FM Push switch FM AUX ASG 128 PHONO 2 MIC PHONO 1 ASG 126 Dial pointer assembly ANT d Dial shaft assembly Push switch SPEAKERS AXA 180 ASG 133 Headphones jack MIC jack AKN 010 AK
12. 471J R27 RD 4PS 393 R28 RD PS 184J R29 RD PS 184 R30 RD PS 103 R31 RD PS 103 R32 MEI R33 RD PS 330 cure d R35 RD 4PS 560J SEMICONDUCTORS Symbol Part No Q1 HA 1457 Q2 HA 1457 Q3 25 945 25 1914 Symbol Part No AKN 012 Description Metal film 92k Carbon film 100 Carbon film 100 Carbon film 510 Carbon film 510 Carbon film Carbon film Carbon film 100 Carbon film 100 Carbon film 470 Carbon film 470 Carbon film 470 Carbon film 470 Carbon film 39k Carbon film Carbon film Carbon film 10k Carbon film 10k Carbon film 56 Description Transistor Description Mic jack List of Changed Parts for Factory Modification Part No Description 12 10 FILTER ASSEMBLY 001 FM MUTING FILTER Ass y 001 047 35 R324K 84238 9 28 73 22 18 20 2 2 7 7 18 S 16 LOW CUT HIGH CUT MULTI PATH FILTER Part List SWITCH SEMICONDUCTORS Symbol Part No Description Symbol Part No Description S1 ASG 128 Push switch D1 152473 or 181555 Diode D2 152473 or 181555 Diode CAPACITORS List of Changed Parts for Factory Modification Symbol Part No Description y Description C1 CSZA R47M 35 Electrolytic 0 47 35V C2 CSZA R47M 35 Electroly tic 0 47 35V 103 50 Mylar 0 01 50V C4 103 50 0 01 50V cs ACE 043 Styrol 1710p 50V C6 ACE 043 Styrol
13. 50V 50V 50V 50V 50V 50V 35V 50V 50V 50V 50V 16V 50V 50V 16V 50V 50V 16V Symbol Part No C74 ACE 019 C75 CKDYB 561K 50 76 CSZA 4R7M 16 77 CKDYB 821K 50 78 CEA 221P 16 C79 CEA 330P 16 C80 COMA 473K 50 C81 CEA 101P 16 C82 CKDYF 4032 50 C83 CEA 101P 6 C84 CKDYB 821K 50 C85 CKDYF 4032 50 RESISTORS Symbol Part No VRI 92 047 VR2 C92 048 VR3 C92 051 VR4 ACP 057 VR5 ACP 056 R1 RD PS 105 R2 RD AVS 182 R3 5 562 R4 RDYaVS 270 R5 151J R6 RD 4VS 224 R7 RD APS 123J R8 RD A4PS 151 R9 RD APS 220 R10 RDPS 121J R11 RD VS 103 R12 RD 4VS 472 R13 RD PS 102 R14 121 R15 RD PS 101 R16 RD APS 331 R17 RDAVS 560J R18 RD 4VS 560 R19 RD VS 102J R20 RD PS 331 R21 RD PS 304 R22 RD PS 331J R23 RD PS 621J R24 RD APS 621 R25 RD PS 822 46 Description Styrol Ceramic Electrolytic Ceramic Electrolytic Electrolytic Mylar Electrolytic Ceramic Electrolytic Ceramic Ceramic Description Semi fixed Semi fixed Semi fixed Semi fixed Semi fixed Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon 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 880p 560p 4 7 820p 220 33 0 047 100 0 04 100 820p 0 04
14. P HA 1197 07 1002 as PA1001 A 14 13 12 4 13 12 14 13 12 4 6 A 1 lt RN 4 824 015 31 1 j STS 620 598 TSKT 5 b 1 5 AM t es MUT IN vco vco 1 IN OUT OUT OUT KILLER 2 4 i i 41 001 3 lt AWT 001 No 4 AWT 001 No 18 AWR 152 No 16 GWS 125 No 21 1080 co 0D 2 oe 6 Antenna terminal AM GWS 124 No 5 GWS 125 No 20 AWM 120 No 9 GWS 125 No 22 GWS 125 No 26 3WS 125 No 18 dus 3 m PLs AWT 001 No 1 mE 59 208 d glos ANY o 137 d 60 E 8 1 Has ti d la 2608 152115 Voh esu A NNE VN 37 E d ona ka 5K x 9 yo ay R67 10K SP 5 53 60 1 T ssp 21519 8 111 B us 2 N 95 a 16 3 3 zmaj q Paot m 6 gt 33415 n 8 813 b ds 9 0 0 lt 5 9 fe L T ve Teo LAPI R27 24K Fs 33 V 0483 147 mds 193 33K if E 9 TT 457 gt 58 2 hey 33 16 e ET 2 hse V 8 J 818 A lt lt d 87 bar 5 630004 nn i 2 m E 21555 5 Rea
15. Part No 4032 50 CCDSL 330K 50 CSZA OR1M 35 CEA R47P 50 CKDBC 4732 25 CKDYF 4032 50 CKDYF 4032 50 CEA 010P 50 CKDYF 1032 50 CKDYF 1032 50 CSZA 100M 16 CEA 221P 16 CEA 010P 50 CSZA 010M 25 CSZA 100M 16 CSZA 6R8M6 5 511 50 CSZA 3R3M 16 CSZA 3R3M 16 CSZA R56K 35 CSZA R56K 35 CEA 470P 10 CEA 470P 10 ACE 019 CSZA 100M 16 CKDYF 1032 50 CKDYF 4032 50 COSA 331J 50 CKDYF 1032 50 CCDXL 080F 50 CKDYF 1032 50 CKDYF 4032 50 CKDYF 1032 50 CKDYB 102 50 CKDYF 403Z 50 CKDYB 821K 50 CEA 3R3P 50 CEA 4R7P 35 CKDYB 122K 50 333J 50 683 50 CKDYF 4032 50 CEA 100P 16 CCDSL 151K 50 CCDSL 151K 50 CSZA 4R7M 16 CKDYB 821K 50 CKDYB 561K 50 CSZA 100M 16 Description Ceramic Ceramic F ectrolytic Electrolytic Ceramic Ceramic Ceramic Electrolytic Ceramic Ceramic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Styral Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Styrol Electrolytic Ceramic Ceramic Styrol Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Electrolytic Electrolytic Ceramic Mylar Mylar Ceramic Electrolytic Ceramic Ceramic Electrolytic Ceramic Ceramic Electrolytic 50V 50V 35V 50V 25V 50V 50V 50V 50V 50V 16V 16V 50V 25V 16V 6v 50V 16V 16V 35V 35V 10V 10V 16V 50V 50V 50V 50V 50V 50V
16. 120 25 0712 86 oM uu a Qa 1 gt 60 5 258682 250712 R3 2 2 20 of a 42150 s R108 2K Law lt 9445 735 La STs 142 4 els 25094534 75 cus 548 023 2200 35 gt BWS 124 No 5 PL STEREO 220 80 AWE 092 No 11 22000 71 GWS 125 No 26 WE 092 No 30 WM 120 No 1 22 5001 0600 R2 I0K 2w Ri 2w 220 100 AWM 120 No 9 DX Ibo AWH 071 No 22 C 22000 71 INDICATOR i 403 AWE 092 No 15 AWH 071 No 12 BRN RED WHT S RED WHT AWM 120 No 14 3 PL Dial scale ew PL Dial scale 3 PL Dial scale 1080 AWM 120 13 Parts List of Power Supply Assembly 152 CAPACITORS Symbol Part No C1 ACG 004 C2 ACG 004 004 C4 ACG 004 004 C6 ACG 004 C7 ACG 004 C8 ACG 004 C9 COMA 104K 250 C10 ACG 004 C11 CEA 221P 100 C12 CEA 221P 100 C13 CEA 221P 35 15 221 80 16 221 80 C17 CEA 470P 16 C18 CEA 470P 16 C19 CEA 4R7P 50 C20 CEA 4R7P 50 C21 CKDYB 471K 50 C22 CKDYB 471K 50 C23 ACH 060 C24 CEA 470P 25 C25 CEA 470P 25 RESISTORS Symbol Part No R1 PS2P 103J R2 PS2P 103J R3 RD PSF 2R2J R4 RD PSF 152J R5 RD 4PSF 152 R6 RD PSF 152 R7 RD PSF 152J R8 RD 4PSF 2R2J R9 PS2P 100J R10 822 R11 PS1P 472J R12 RDYPS 473 R13 RD PS 153 R14 RD PS 153 R15 R
17. 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 RD PS 242 Carbon film 2 4k R5 RDAPS 474 Carbon film 470k R6 RDAPS 474 Carbon film 470k R7 104 Carbon film 100k Ba 5 1080 side A E N M VE 2 047 35 0 2 22127 20175 12116 08721512 0 v O AWG 056 No 5 AWE 092 No 10 AWG 056 No 4 092 No 14 AWG 056 No 3 gt AWE 092 No 20 gt AWE 092 No 16 AWE 092 No 18 gt AWE 092 No 12 WS 125 27 C Eie AWE 092 No 22 C AWE 092 No 23 AWE 092 No 21 5 GWS 125 31 gt AWE 092 No 9b GWS 125 No 29 gt 019 071 6 2 POWER IN OUT PRE OUT POWER IN AWH 071 No 7 L D D AWH 071 No 6 RIS 65 66 1 POWER SUPPLY 55 152 76 130 FU3 01 0410 2 x4 OR 100 KBPCIO 02 Cs 0 01 4 20 33V Q 22 60V 7 5V FUNCTION IND gt 6WS 125 No 5 AWG 056 2 lt 120 12 lt AWH 071 No 8 lt AWH 071 No 4 GWG 112 No 9 071 No 5 GWG 112 No 5 AWM 120 No 2 AWH 071 No 1 GWS 124 No 3 Foil side Dio LZ 230 Da 41116 0 2 130 0 Dn 2 230 5 26 24 22
18. 5 AWR 152 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 12 7 POWER AMPLIFIER ASSEMBLY 071 05 25 912 2SD38IA 01 254979 010 IW KADI 120 0 258536 icd 152471 2 10 60V 02 2SCITT5A 2501885 2 18247152 STV4H 125 No 3 AWX 125 No 1 AWX 125 No 4 AWX 125 No 2 AWR 152 No 8 Foil side AWM 120 No 2 AWR 152 No 27 AWM 120 No 4 AWM 120 No 3 AWR 152 24 GWG 112 No 9 AWT 001 No 21 1080 125 No 3 AWX 125 1 AWX 125 4 AWX 125 2 AWR 152 No 7 a 4 wu annb 4 PRE OQ 1 PRE our AWM 120 No 8 AWR 152 No 22 GWG 112 No 5 AWR 152 No 25 AWT 001 No 19 AWT 001 No 20 55 Parts List of Power Amplifier Assembly AWH 071 COIL Symbol Part No L1 T63 009 CAPACITORS Symbol Part No C1 CEANL 2R2P 25 C2 CEANL 2R2P 25 CCDSL 561 50 C4 CCDSL 560K 50 C5 CCDSL 560K 50 C6 CCDSL 330K 500 C7 CCDSL 150K 500 C8 ACG 009 c9 CCDSL 331K 500 C10 CCDSL 331K 500 C11 CSSA R22M 25 C12 COMA 104K 50 C13 COMA 104K 50 C14 CCDSL 560K 50 C15 ACG 009 RESISTORS Symbol Part No VR1 ACP 019 VR2 ACP 063 R1 RD APS 564J R2 RD PS 102 R3 RD PS 102J R4 RD PS 243 R5 RD PS 124 R6 RD PS 243J R7 RD PS 272 R8 RD PS 272 R9 RDZPSF 151 R10
19. Lever knob assembly POWER AAD 139 Washer M45 086 SX TENES B71 004 CADO y Z 7 D 2227 gt Bottom plate SE N X i SS 5 spring 035 064 Foot assembly N 022 Foot assembly 2 i ANR 022 Lever knob LOUDNESS MUTING Knob TUNING c 138 AAA 047 S Knob BALANCE AAB 176 Knob BASS TREBLE AAB 175 Nut ABA 012 Knob VOLUME B71 004 i 174 11 2 COMPONENT OF PANEL STAY NOTE Parts indicated in green type cannot be supplied A ENED RN Wedge type pilot lamp ABL 029 Lamp socket i Meter holder Acrylic board ANR 020 eee ee gt gt Dressing plate L Pilot lamp with wire STEREO Filter assembly L 5 sales AEL 069 AWT 001 Screw x 7 067 Pilot lamp with wire lt lt SIGNAL TUNING ENTM R AAW 075 Speaker switch assembly Dial scale hold L 5 N 0 pilot lamp with wire PHONO GWS 124 5 AEL 067 Pilot lamp with wire AUX AEL 067 Dial panel i Dial shaft assembl 14 141 Z Ai80 Pulley small 256 Shield
20. RS1P 103J R11 101 R12 RD PSF 151 R13 RD APS 562 R14 RD PSF 151 R15 RDAPSF 151 R16 RT5B OR5K R17 RT5B OR5K R18 RT5B OR5K R19 RT5B OR5K R20 RS2P 100J R21 RS1P 562J 56 Description Description Electrolytic Electrolytic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Electrolytic Mylar Mylar Ceramic Ceramic Description Semi fixed Semi fixed Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Metal oxide Carbon film Carbon film Carbon film Carbon film Carbon film Wier wound Wier wound Wier wound Wier wound Metal okide 2 2 2 2 560p 56p 56p 33p 15p 0 047 330p 330p 0 22 0 1 0 1 56p 0 047 100 B 150k 560k 1k 1k 24k 120k 24k 2 7k 2 7k 150 10k 100 150 5 6k 150 150 0 5 0 5 0 5 0 5 10 5 6k 25V 25V 50V 50V 50V 500V 500V 150V 500V 500V 25V 50V 50V 50V 150V 1W Symbol Part No R22 RD PS 161 R23 RD PS 220 R24 RDXPS 220 R25 RD PS 220 R26 RD PS 220 R27 RS2P 100J R28 RD PSF 132 R29 RD PSF 132 R30 RD PS 153 R31 RD PS 153 R32 5 272 R33 RD PS 563J SEMICONDUCTORS Symbol Part No 01 2SA979 F Q2 25 1775 25 1885 04 25 1885 05 25 912 0 or 06 250381 L 07 258536 L 08 25 869 D1
21. case E Capacitor cover Lever switch ASK 080 Pulley small Shaft cover Nut i 71 004 P Dial pointer assembly 294 d cH 065 Binder Tone control assembly Washer M45 086 i Speaker shield pl RT 3x6 sed pate Dressing plate R Screw ABA 067 Dial scale hold Screw ABA 116 N N P b im Eius m P g Screw E Function and equalizer ass ABN 021 o _ 1 GWS 125 Front frame Flat amplifier assembly GWG 112 B71 004 001 1 Tee tur Pap an ug Recte TCT fnnc n emat TEL eminet A nt 222 1080 113 COMPONENT OF CHASSIS Power transformer ATT 448 Insulator AKX 054 Transistor 250737 Insulator spacer ww Power transistor connector AEC 339 555 assembly 125 Capacitor 003 Fuse 10A 302 NU Rn Capacitor cover h AEC 279 a use 1 5 202 AEK 104 Power supply assembly Be 054 AWR 152 4 4 Transistor 258701 nsulator 5 339 777 Connector aristor 144 Insulator spacer 339 STV 4H Transistor 258701 I Insulatior 201 S T 3x6 AKX 054 y 1 Screw 8 129 PA 2 Y ower amplifier assembly RT 3x6 Frame L a Insulator space
22. 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 b Negative half cycle bridge Fig 8 1 Schematic diagram of protection Fig 8 2 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 Set an 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 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 600kHz and 1400 2 Adjust 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 SX 1080 1080 Oscilloscope Terminal TAPE REC Terminal gt AM ANTENNA 1kQ resistor Fig 9 Connection of AM tracking adjustment 9 2 FM TUNER ea Confirm that the dial is set to te start point Connect as shown in Fig 10 and set the FUNC TION switch
23. 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 PLL Sub Pilot af Corrier Decoder Auto Switch Q Amp Conceller STEREO MONO Auto Switch Circuit i 5 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 or less Fig Block diagram 1002 AM Tuner The AM tuner 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 exce
24. 0F 50 Ceramic 10p 50V 01 25 34 0 13 CEANL 101 10 Electrolytic 100 10V 2SK68A L or M C14 CEANL 101P 10 Electrolytic 100 10V Q2 25 34 D FET C15 CEANL 101P 10 Electrolytic 100 10V 28K68A L or M 03 2SA726S F G Transistor C16 CEANL 101P 10 Electrolytic 100 10V 2SA872A D or C17 CEA 101P 25 Electrolytic 100 25V 4 25 7265 or G Transistor C18 CEA 101P 25 Electrolytic 100 25V 2SA872A D or E C19 CEANL 4R7P 25 Electrolytic 4 7 25V C20 CEANL 4R7P 25 Electrolytic 4 7 25V H 2 List of Puce Parts for Factory Modification RESISTORS Description Symbol Part No Description VR1 ACV 162 Variable resistor 100k VR2 ACV 190 Variable resistor 250 R5 RD APS 472 Carbon film 4 7k R6 RDAPS 472 Carbon film 4 7 R7 RDAPS 473 Carbon film 47k R8 RDAPS 473 Carbon film 47k R9 622J Carbon film 6 2k R10 RDAPS 622 Carbon film 6 2k R11 RDAPS 622 Carbon film 6 2k R12 RD PS 622J Carbon film 6 2k R13 RD PS 683 Carbon film 68k R14 RD 4PS 683 Carbon film 68k R15 RD PS 101 Carbon film 100 51 1 Flat Amplifier Assembly GWG 112 ao m 0 sO a TUN 240 1081802 32NV V8 gt lt 68 150 194 6301 35 717 5 1 0725 i si Rig 224 mb 15 gt ra x 590452 750 D 5e 1080 side GWS 125 No 13 GWS 125 No 15 GWS 125 16 GWS 125 11 AWH 071 No
25. 100k 47k 4 7k 150k 22k 1M 1 8k 5 6k 27 150 220k 12 150 22 120 4 7k 1k 120 100 330 56 56 1k 330 300k 330 620 620 8 2 50V 16V 50V 16V 16V 50V 16V 50V 6v 50V 50V xW Symbol R26 R27 R28 R29 R30 R31 R32 R33 R34 R35 R36 R37 R38 R39 R40 R41 R42 R43 R44 R45 R46 R47 R48 R49 R50 R51 R52 R53 R54 R55 R56 R57 R58 R59 R60 R61 R62 R63 R64 R65 R66 R67 R68 R69 R70 R71 R72 Part No RD PS 511J RD PS 242J RD PS 163 RD PS 222 RD PS 102 RD PS 8224 RD PS 151 RD PS 332 RD PS 332 RD PS 152 RD PS 152J RD PS 161 RD PS 822 RD PS 182 RDXPS 104 RD PS 473 SQ 1502F RD VS 105 RD PS 104 RD PS 751J RD PS 332 RDXPS 332J RDAPS 471 RD PS 471 RDAPS 303J RD PS 303J RDXPS 104J RD PS 2225 RD PS 104 RD74PS 303 RD APS 303J RD PS 222J 222 RD PS 752 RD APS 822 RD PS 752J 151J RD PS 562 RD PS 152J 201J RDAPS 181J RD 4PS 103 RDAPS 103 RD PS 222 RD 4PS 102 RD VS 560 RD VS 560J Description Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Metal film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon fil
26. 11 203J 50 Mylar 0 02 50V R25 RD PS 182 Carbon film 1 8k 212 203 50 Mylar 0 02 50V C13 CKDYA 152J50 Ceramic 0 0015 50V R26 RD PS 182 Carbon film 1 8k C14 CKDYA 152J50 Ceramic 0 0015 50 R27 5 1019 Carbonfilm 100 C15 CKDYA 152J 50 Ceramic 0 0015 50V R28 RDAPS 101 Carbon film 100 R29 RD PS 682J Carbon film 6 8k C16 CKDYA 152J50 Ceramic 0 0015 50V R30 RD 4PS 682 Carbon film 6 8k C17 CEANL 2R2P 50 Electrolytic 2 2 50V C18 CEANL 2R2P 50 Electrolytic 2 2 50V R31 104J Carbon film 100k C19 CEANL 2R2P 50 Electrolytic 29 50V R32 RD PS 104J Carbon film 100k C20 CEANL 2R2P 50 Electrolytic 2 2 50V R33 RD 4PS 101J Carbon film 100 R34 RD PS 101J Carbon film 100 C21 CEA 101P 10 Electrolytic 100 10V C22 CEA 101P 10 Electrolytic 100 10V C23 CEA 470P 35 Electrolytic 47 35V SEMICONDUCTORS C24 CEA 470P 35 Electrolytic 47 35V Symbol Part No Description C25 CEANL 2R2P 50 Electrolytic 2 2 50V 01 25 1919 G Transistor C26 CEANL 2R2P50 Electrolytic 2 2 50V 25 1312 or C27 CCDSL 1002 50 Ceramic 10p 50V 02 25 1919 orG Transistor C28 CCDSL 100F 50 Ceramic 10p 50V 25 1312 or RESISTORS List of Changed Parts for Factory Modification Description si eae Description VR1 ACV 136 Variable resistor 100k B VR2 ACV 136 Variable resistor 100k B R1 RDXPS 104J Carbon film 100k R2 RDXPS 104J Carbon film 100k R3 RD PS 223 Carbon film 22k 4
27. 152471 02 152471 D3 10EA or 51801 02 04 10EA or SIBO1 02 D5 STV4H D6 152471 07 152471 OTHERS Symbol Part No AKM 022 AEC 410 ANH 203 Description Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Description Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Diode Diode Diode Diode Varistor Diode Diode Description plug Transistor cover Heat sink 160 22 22 22 22 10 1 3k 1 3k 15k 15k 2 7k 56k 2W List of Changed Parts for Factory Modification 12 8 SPEAKER SELECTOR ASSEMBLY GWS 124 Parts List SWITCH Symbol Part No ASG 133 CAPACITORS Symbol Part No C1 CSZA 4R7M 6 C2 CEA 330P 10 CSZA 4R7M 6 C4 CEA 330P 10 C5 101P 6 RESISTORS Symbol Part No 006 VR2 ACP 006 R1 RS3P 151J R2 RS3P 151J R3 RD APS 562 R4 RDX PS 471 R5 RD PS 391 R6 RD 4PS 204 R7 RD PS 303 R8 RD PS 152J R9 RD PS 562 R10 RDPS 471 R11 RDAPS 391 R12 RD PS 204 R13 RD PS 303J R14 RDZPS 152 R15 RD PS 222 SEMICONDUCTORS Symbol 02 01 02 03 04 05 06 07 08 09 010 Part 28C1919 G or F 2SC1312 F or G 28C1919 G or F 2SC1312 F or G 1S2473 or 1S1555 1S2473 or 1S1555 1S2473 or 1S1555 1S2473 or 1S1555 1S2473 or 1S1555 1S2473 or 1S1555
28. 1S2473 or 1S1555 1S2473 or 1S1555 Description Push switch Description Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Description Semi fixed Semi fixed Metal oxide Metal oxide 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 Description Transistor Transistor Diode Diode Diode Diode Diode Diode Diode Diode 152473 151555 Diode 152473 151555 Diode 4 7 6 33 10V 4 7 33 10v 100 470 470 150 150 5 6k 470 390 200k 1 5k 5 6k 470 390 200k 1 5 2 2k Symbol Part No Description 011 152473 181555 Diode OTHER Symbol Part No Description 010 Headphone jack List of Changed Parts for Factory Modification Description 57 1 Speaker Selector Assembly GWS 124 I3V GND 0 0 2501919 x2 152473 58 side Di 152473 HEADPHONES JACK 02 152473 410 0 4 0 oww D3 152473 Rs 390 o0 N o 04 152473 20 01919 91 AWE 092 NE TIAE 120 NOY 9 GWS 125 No 209 H AWE 092 No 30 9 WWR 152 No 169 oe AWE 092 No 1s lt 0 3 PL STEREO INDICATOR AWR 152 No 28 Dio 152473 Ri2 200K D7 1524
29. 2 5578 318381 NYAL 83 0 304 152 No 20 otto 22125 R32100 2 001 22 AWT 001 No 23 AWT 001 No 24 GWG 112 6 GWG 112 7 GWG 112 8 47 25 47 25 Ri 100K sx 1080 49 Parts List of Tone Assembly 056 SWITCHES Symbol Part No Description Symbol Part No Description 51 ASE 105 Rotary slide switch R8 RDYAPS 105 Carbon film 1M 52 ASE 106 Rotary slide switch R9 RD A4PS 105 Carbon film 1M S3 ASK 144 Lever switch R10 RD 4PS 105 Carbon film 1M R11 RD PS 123 Carbon film 12k CAPACITORS R12 RD PS 123J Carbon film 12k Symbol R13 RD PS 475J Carbon film 4 7M an R14 RD PS 475J Carbon film 4 7 C1 CEANL 4R7P25 Electrolytic 4 7 25V R15 RD PS 101J Carbon film 100 C2 CEANL 4R7P 25 Electrolytic 4 7 25V 4 CEANL 4R7P 25 Electrolytic 47 25 R16 RDAPS 101 Carbon film 100 CEANL 4R7P 25 Electrolytic 47 25 817 RD PS 682 Carbon film 6 8 C5 COMA 203J 50 Mylar 0 02 50V R18 RD PS 682 Carbon film 6 8k R19 RD PS 682 Carbon film 6 8k C6 203 50 Mylar 0 02 50V R20 682 Carbon film 6 8k 67 203J50 Mylar 0 02 50V 203 50 0 02 50V R21 RD PS 564 Carbon film 560k 203 50 0 02 50V R22 RD PS 564 Carbon film 560k C10 COMA 203J 50 Mylar 0 02 50V R23 104 Carbon film 100k R24 RD PS 104J Carbon film 100k C
30. 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 Front panel Fig 15 Meter adjustment 26 5 1080 10 DIAL CORD STRINGING Remove the bonnet and front panel as des cribed in Disassembly on page 10 Loosen screws and remove the blind sash as shown in Fig 16 1 Turn the front end variable capacitor shaft fully clockwise Vanes of capacitor fully inside 2 Tie end of the string to the peg on 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 A gt B pulley C gt dial shaft 3 tums 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 Tum 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 zi En ae BER N MA Start point 2 Pulley Pulley C 1 2 turn along groove Fig 17
31. 50 CCDSL 150 50 C10 CCDSL 100F 50 C11 CKDYB 103K 50 12 CCDSL 101K 50 C13 CKDYB 103K 50 C14 CCDLH 430K 50 C15 CCDCH 080F 50 C16 CCDCH 330K 50 C17 CCDCH 150K 50 C18 CKDYB 102K 50 C19 CKDYF 4032 50 C20 CKDYA 332 50 C21 4032 50 C22 CCDSL 121K 50 C23 CKDBC 4732 25 C24 CKDBC 4732 25 45 Description FM antenna coil coil coil coil matching coil transformer OSC coil FM ceramic filter FM ceramic filter FM ceramic filter FM ceramic filter Low pass filter 455kHz filter AM ceramic filter RF choke coil RF choke coil Micro inductor RF choke coil RF choke coil Description Variable capacitor Ceramic trimmer Ceramic 15p Ceramic 100p Ceramic 0 01 Ceramic 2p Ceramic 0 01 Ceramic 0 01 Ceramic 18p Ceramic 18p Ceramic 15p Ceramic 10p Ceramic 0 01 Ceramic 100p Ceramic 0 01 Ceramic 43p Ceramic 8p Ceramic 33p Ceramic 15p Ceramic 1000p Ceramic 0 04 Ceramic 3300p Ceramic 0 04 Ceramic 120p Ceramic 0 047 Ceramic 0 047 50V 50V 50V 50V 50V 50V 50V 50V 50V 50V 50V 50V 50V 50V 50V 50V 50V 50V 50V 50V 50V 25V 25V Symbol C25 C26 C27 C28 C29 C30 C31 C32 C33 C34 C35 C36 C37 C38 C39 C40 C41 C42 C43 C44 C45 C46 C47 C48 C49 C50 C51 C52 C53 C54 C55 C56 C57 C58 C59 C60 C61 C62 C63 C64 C65 C66 C67 C68 C69 C70 C71 C72 C73
32. 73 120 No 6 GWS 128 No E GWS 128 No B VsNs AWM 120 No 7 8 59 125 e gt E ta e 9 lt IN 9 E 9 12 SECUS nen E vu LStIVH ie V 60 5 1080 Pi AWE 092 No 29 lt _____ STEREO IND AWE 092 No 25 07 AWE 092 No 15 AWE 092 No 8 AWE 092 No 11 AWE 092 No 5 AWE 092 No 30 AWE 092 No 6 120 No 9 AWE 092 No 9 GWS 124 No 5 GWG 112 No 4 lt GWG 112 No 3 152 No 16 GUNG TING 2 GWG 112 2 AWT 001 No 10 AWR 152 No 18 GWG 112 No 1 AWE 092 No 28 AWT 001 No 17 AWT 001 No 15 Foil side v 3 2 23 25 26 27 28 29 33 a 7 TUNING METER 259454 345 My ob K AWE 092 No 27 0 oto 0035 813 32K 7 55K 55 5 1722 50 otto Ris 100K e 01 100125 AM FM SIGNAL METER Parts List Function and Equalizer Assembly GWS 125 SWITCH Symbol Part No 51 ASG 126 CAPACITORS Symbol Part No C1 CCDSL 510J 50 C2 CCDSL 510 50 CEANL 2R2P 50 C4 CEANL 2R2P 50 65 CCDSL 220K 50 C6 CCDSL 220K 50 CCDSL 101K 50 C8 CCDSL 101K 50 C9 471 6 C10 CEA 471P 6 C11 CEA 101P 25 C12 CEA 101P 25 C13 1036 50 C14 COPA 103G 50 C15 CQPA 353G 50 C16 COPA 353G 50 C17 CEANL 2R2P 50 C18 CEANL 2R2P 50 C19 CEA 221K 6 3 C20 COMA 472
33. APE 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 5 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 T 9 ters MPIONEER STEREO RECEIVER SX 10BO MODE SWITCH Use this switch for selecting mono or stereo performances STEREO Set 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
34. D PS 513 R16 R17 R18 RD PS 121 R19 RDYAPS 622 69 Description Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Mylar Ceramic Electroly tic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Electrolytic Ceramic Ceramic Electrolytic Electrolytic Electrolytic Description Metal oxide Metal oxide Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Metal oxide Carbon film Metal oxide Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film 0 01 0 01 0 01 0 01 0 01 0 01 0 01 0 01 0 1 0 01 220 220 220 220 220 47 47 4 7 4 7 470p 479p 2200 47 47 10k 10k 2 2 1 5k 1 5k 1 5k 1 5k 2 2 10 8 2k 4 7k 47k 15k 15k 51k 120 6 2k 150V 150V 150V 150V 150V 150V 150V 150V 250V 100V 100V 35V 80v 80v 16V 16V 50V 50V 50V 50V 35V 25V 25V 2W 2W 2W 1W W SEMICONDUCTORS Symbol Part 01 250712 0 or C Q2 25 1735 or C 25 1384 03 2SA850 D C 25 684 04 258682 0 5 2SD712 D or C Q6 25 945 2SC1914 F D1 10E2 or SIBO1 02 D2 10 2 or 51 01 02 D3 10 2 or 51801 02 D4 10E2 or SIBO1 02 D5 KBPC10 02 515 20 06 1022 51801 02 07 1022 or 51801 02 08 MZ140 WZ 140 D9 MZ130 or WZ 130 D10 LZ230 D11 LZ230 OTHERS Symbol Part No ANH 395 AN
35. H 203 AKR 013 AKR 030 List of Changed Parts for Factory Modification Part No Description Transistor Transistor Transistor Transistor Transistor Transistor Diode Diode Diode Diode Diode Diode Diode Zener diode Zener diode Zener diode Zener diode Description Heat sink Heat sink Fuse holder Fuse holder Description 12 12 TERMINAL ASSEMBLY GWS 126 Parts List RESISTORS Symbol Part No Description R1 222 Carbon film 2 2k PE 5 F M Y R2 RD PM 222J Carbon film 2 2k L R3 222 Carbon film 2 2k 4 RDYAPS 222 Carbon film 2 2k PAYBACK MONITOR e e d REC WA 1 OTHER PL ATSACK Symbol Part No Description AKB 027 4P pin jack Foil side TAPE 7 2 MONITOR R322K alg 5 n PLAYBACK G H R1226 wo GWG 112 No 1 GWG 112 No H GWG 112 J GWG 112 No G GWG 112 No D GWG 112 No C GWG 112 F GWG 112 12 13 TERMINAL ASSEMBLY GWS 127 Foil side HG 7 GWS 125 GWS 125 No 863 GWS 125 L GWS 125 No E GWS 125 No K GWS 125 No D Part List GWS 125 No GWS 125 No B Symbol Part No Description GWS 125 No C AKB 028 6 P pinJack TAG 5 1080 12 14 SPEAKER TERMINAL ASSEMBLY GWS 128 GND GND Foil side GWS 124 No D SPEAKER A SPEAKER
36. K 50 C21 272 50 C22 CEA 100P 16 C23 CKDYF 2222 50 C24 CKDYF 2222 50 C25 CCDSL 510 50 C26 CCDSL 510J 50 RESISTORS Symbol Part No R1 RD PS 104 R2 5 104 R3 RD PS 471 R4 RD PS 471 R5 RD PS 104 R6 RD PS 104 R7 SQ 1470F R8 SQ 1470F R9 RD PS 101 R10 RD PS 101J R11 011 R12 ACN 011 R13 ACN 012 Description Push switch Description Ceramic Ceramic Electrolytic Electrolytic Ceramic Ceramic Ceramic Ceramic Electrolytic Electrolytic Electrolytic Electrolytic Polypropylene Polypropylene Polypropylene Polypropylene Electrolytic Electrolytic Electrolytic Mylar Mylar Electrolytic Ceramic Ceramic Ceramic Ceramic Description Carbon film Carbon film Carbon film Carbon film Carbon film Carbon film Metal film Metal film Carbon film Carbon film Metal film Metal film Metal film 51p 50V 51p 50V 22 50V 2 2 22 50 22 50 100p 50V 100p 50 470 6 470 6 100 25V 100 25V 0 01 50V 0 01 50V 0 035 50V 0 035 50V 2 2 50V 22 50V 220 6 3 0 0047 50V 0 0027 50V 10 16V 2200 50V 2200p 50V 51p 50V 1 50V 100k 100k 470 470 100k 100k 147 147 100 100 7 55 7 55k 92k Symbol Part No R14 ACN 012 R15 RDYPS 101 R16 RD PS 1019 R17 RD PS 511 R18 RD PS 511 R19 RD PS 104 R20 RD4PS 104 R21 RD PS 101 R22 RD PS 101 R23 RD PS 471J R24 RD PS 471J R25 RD PS 471 R26
37. N 012 INNEN 1 94 9 Lever switch POWER Lever switch MUTING ASK 080 ASK 144 Rotary slide switch TURNOVER Variable resistor VOLUME ASE 105 ACV 162 Variable resistor BASS TREBLE Variable resistor BALANCE ACV 136 ACV 190 Rotary slide switch TURNOVER Lever switch TAPE MODE LOUDNESS ASE 106 ASK 144 Lever switch DUPLICATE ASK 145 5 1080 53 TOP VIEW WITH BONNET REMOVED Capacitor Power amplifier assembly ACH 085 071 Power amplifier assembly AWH 071 Power transformer ATT 448 m s Power supply assembly Tuner assembly AWR 152 AWE 092 Aclylic board ANR 020 153 54 BOTTOM VIEW WITH BOTTOM PLATE REMOVED Power amplifier assembly Ix D Power amplifier assembly AWH 071 AWH 071 Flat amplifier assembly Tone control assembly GWG 112 AWG 056 Tuner assembly Protection assembly AWE 092 AWM 120 55 REAR PANEL VIEW 4P pin jack AKB 035 Antenna terminal AKA 002 Bar antenna ATB 505 Bar antenna holder AKB 012 CERTIFICATION THIS RECEIVER COMPLIES AS DATE OF MANUFACTURE WITH THE FCC RULES AND REGULATIONS PART 15 SUBPART C r CAUTION DO NOT REMOVE SCREWS 5 NOTICE nue CAUTION SPEAKER IMPEDANCE 4 A B 4 OR MORE SPEAKER 80 OR MORE SPEAKER gt 6 Terminal GND 031 Jumper plug AKM 004
38. Output No more than 0 05 60 watts per channel power output ORMS see 52721772 No more than 0 0296 1 watt per channel power output slohms ww SE No more than 0 0296 Frequency Response 5 Hertz to 100 000 dB Input Sensitivity Impedance POWERTSAMP Moers ccs ea RS 1V 50 kilohms Output ES Damping Factor 20 Hertz to 20 000 Hertz 8ohms 30 Hum and Noise IHF short circuited A Network 100dB Preamplifier Section Input Sensitivity Impedance PHONO SQ 2 5 50 kilohms ED a a or 2256 7 5 50 kilohms CREE 150mV 50 kilohms TUN BESPISAA ER 150mV 50 kilohms 4 541 Lose cafe 150mV 50 kilohms PHONO Overload Level 1kHz T H D 0 05 REN Re 200mV Output Level Impedance TAVE 5 150mV TAPE RECZ Ls I eet d 150mV CENE y 1V 1 kilohms Total Harmonic Distortion 20Hz to 20 000Hz 1V output No more than 0 05 Frequency Response RIAA equalization 20Hz to 20 000Hz 0 2 AUNT ARESRICAY 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 as Dei RUD PI 15Hz 6dB oct DER 6kHz 6dB oct Loudness Contour Volume
39. RD PS 223 Carbon film 22k R5 RD PS 223 Carbon film 22k R6 RD PS 223 Carbon film 22k R7 RD PS 105 Carbon film 1M 50 5 12 6 FLAT AMPLIFIER ASSEMBLY GWG 112 Parts List SWITCHES Symbol Part No Description Symbol Part No Description S1 ASK 145 Lever switch R16 RD PS 101 Carbon film 100 S2 ASK 144 Lever switch R17 RDXPS 223 Carbon film 22k S3 ASK 144 Lever switch R18 RDYAPS 223J Carbon film 22k 54 ASK 144 Lever switch R19 RD PS 134 Carbon film 130k 55 ASK 144 Lever switch R20 RDYAPS 134 Carbon film 130k S6 ASK 144 Lever switch R21 RD PS 753J Carbon film 75k R22 RD PS 753 Carbon film 75 R23 RD PS 122 Carbon film 1 2k CAPACITORS R24 RD PS 122J Carbon film 1 2k Symbol Part N Description R25 RD PS 822 Carbon film 8 2k C1 CCDSL 151K 50 Ceramic 150p 50V R26 RDXPS 822 Carbon film 8 2k C2 CCDSL 151K 50 Ceramic 150p 50V R27 RD PS 392 Carbon film 3 9k C3 2 1 35 Electrolytic 0 1 35 R28 RD 4PS 392 Carbon film 3 9k CSZA OR1M 35 Electrolytic 0 1 35V R29 RD 4PS 103 Carbon film 10k C5 CSZA 010 25 Electrolytic 1 25V R30 RD PS 103J Carbon film 10k C6 CSZA 010 25 Electrolytic 1 25V R31 RD PS 101 Carbon film 100 07 CCDSL 560K 50 Ceramic 56p 50V R32 RD amp PS 101 Carbon film 100 C8 CCDSL 560K 50 Ceramic 56p 50V C9 CCDSL 680K 50 Ceramic 68p 50V C10 CCDSL680K 50 Ceramic 68p SEMICONDUCTORS Symbol Part No Description C11 CCDSL 100F 50 Ceramic 10p 50V ieee C12 CCDSL 10
40. V C4 CEA 470P 16 Electrolytic 47 16V cs CEA 470P 16 Electrolytic 47 16V C6 CEA 010P 80 Electrolytic 1 80V RESISTORS Symbol Part No Description R1 5 132 Carbon film 1 3k R2 RD PS 133 Carbon film 13k R3 RS2P 182J Metal oxide 1 8k 2W RA RDAPSF 821 Carbon film 820 xW R5 RD PS 753 Carbon film 75k R6 5 753 Carbon film 75 7 RD PS 113 Carbon film 11k R8 RD PS 474 Carbon film 470k R9 RS1P 332J Carbon film 3 3k 1W R10 751J Carbon film 750 R11 ACN 019 Cement S 20W R12 RS2P 222J Metal oxide 2 2k 2W R13 RD PS 152 Carbon film 1 5k R14 RD APS 103 Carbon film 10k R15 RD 4PS 103 Carbon film 10k SEMICONDUCTORS Symbol Part No Description Q1 2SA733 Q or Transistor or 2SA904A E or F Q2 25 1438 or B Transistor or 28C1915 E or F Q3 PA3004 D1 MZ 130 or WZ 130 Zener diode 02 152471 Diode D3 152471 Diode OTHERS Symbol Part No Description ASR 048 Relay ASR 046 Relay TF1 AEX 001 Temperature sensitive fuse 74 5 1080 13 Vinyl bag 027 Side Operating instructions AHA 176 ARB 239 Vinyl bag Ell 024 Sheet AHG 083 Side pad ex AHA 176 4 97 Hexagonal wrench Z Z ANK 018 FM antenna ADH 002 Case AHC 042 Air cap AHG 040 Packing case KU AHD 505 75
41. attern AC voltmeter Distortion meter Terminal lt a O Rch Oscilloscope Terminal 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 assy 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 cannot be obtained by performing the adjustment of item 2 above cut the jumper zi eed wire shown in Fig 14 and adjust to OV with VR2 4 Thr R ch also uses the power amplifier ass y Power amplifier assembly ES AWH 071 Check and adjust this channel in 430 ma 25 gt with items 1 3 above moh 10 QUIT Idle Current Adjustment 1 Connect DC voltmeter between terminals 13 23 of the power amplifier ass y AWH 071 L ch side 7 Jumper wire 2 Set the power switch to wait 10 minutes and then check if the DC voltmeter reads 30mV If it doesn t read 30mV adjust to 30mV by turning 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 MU Fig 14 Power amplifier adjustment 9 5 METER AMPLIFIER 1 Push speaker selector switch button 2 Connect an AC voltmeter to speaker output terminal
42. control set at 40dB position 6dB 100Hz 3dB 10kHz Hum and Noise IHF short circuited A Network PHONG PENES 76dB AUX Y CREE TD IO 90dB MUNG a san 2048 Section Usable Sensitivity oa RTT ER ERE ET 9 8dBf 1 7uV 50dB Quieting Sensitivity uid Nee 14 2dBf 2 8 RE 37dBf 39uV Signal to Noise Ratio ab SaBhic cSTEREOR ae iS chai tien cece 74dB at GSdBf ose 80dB i STEREO 21 12 52 71dB Distortion at 65dBf 100Hz 222 0 1 0 2 1kHz 5 St A 0 1 0 15 6kHz 22222222 0 1 0 2 Frequency Response 30Hz to 15 000Hz 0 5dB Capture Ration 2 en ESI Se OR E 1 0dB Alternate Channel Selectivity riste aa 80dB SpuriousiResponse atio es a 4 3 100dB limage Response Ratio 90dB TEARESHONSE RAUOE 5 od tes 100dB AMUSuppressianm cis nu w AS 55dB Muting Threshold 19 2dBf 5uV Stereo Separation 504 1kHz 354 30Hz 15kHz SUDANEN Product Ratio m us 65dB SCA RECUO PERIODS 6548 Antenna Input 300 ohms balanced 75 ohms unbalanced Section Sensitivity IHF Ferrite 300uV m HEPEXE 15uV Selectiu
43. fiers 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 ac cident An outline of this circuit is shown in Fig 8 1 The relay activating transistor r 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 5 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 to a level where the voltage on pin no 8 exceeds a prescribed level 5 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 through 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 C
44. ity s N ERIS ERES 30dB 51814 04 0186 154 222 2524 0 204 0554 50dB image Response a co rio eR 40dB Pee RESPONSE 2 tenons 162528 40dB ANTENNAS 52 Built in Ferrite Loopstick Antenna Miscellaneous Power Requirements 120V 60Hz Power Consumption 350W UL 800W CSA 1100W 526 W x 176 H x 440 D mm 21 11 16 x 6 15 16 H x 17 5 16 D in Weight Without Package 21 3kg 4716 With Package 24 2kg 531 Furnished Parts PAMIT Be u 22 7 1 Operating Instructions 14 1 He ne SN wet 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 2 DIAGRAM outdoor antenna T type FM antenna AM outdoor antenna gt Turntabl 1 1 Turntable 2 2 tape player AUX 4 1 1 The bridge connecting plugs between OUT and POWER AMP IN jacks always be left in position in normal use If they are disconnected or removed sound will come from the speakers Always be sure to switch off the power supply before attempting to
45. llent AF frequency response and distortion 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 B is supplied to thru and the base of 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 84 TONE CONTROL The tone control circuit is an NFB type inserted in front of the power amp Bass turnover 200Hz gt 400Hz and treble turnover 2 5 2 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 powe
46. m 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 510 2 4k 16k 2 2k 1k 8 2k 150 3 3k 3 3k 1 5k 1 5k 160 8 2k 1 8k 100k 47k 15k 1M 100k 750 3 3k 3 3k 470 470 30k 30k 100k 2 2k 100k 30k 30k 2 2k 2 2k 7 5k 8 2k 7 5k 150 5 6k 1 5k 200 180 10k 10k 2 2k 1k 56 56 W 5 1080 SEMICONDUCTORS List of Changed Parts for Factory Modification Symbol Part No Description Part No Description Q1 3SK45 B FET Q2 3SK45 B FET Q3 2SC1906 Transistor 04 TA 7302P IC 05 01 IC Q6 PA 1001 A IC Q PA 1002 A IC 08 HA 1197 IC 09 25 55 0 EET D1 152473 Diode 12 4 POWER TRANSISTOR CONNECTOR ASSEMBLY AWX 125 071 No 14 AWH 071 No 21 071 No 16 071 No 19 side R2 47 19 4 071 17 071 18 AWH 071 No 15 071 20 Parts List RESISTORS Symbol Part No Description R1 RN1H 4R7J Metal film 4 7 1W R2 RN1H 4R7J Metal film 4 7 TW 47 1 2 125 TONE CONTROL ASSEMBLY AWG 056 TUN 1081 03 5578 51000 51000 705102 318381 18K 4 422 100 10 6161252 29 CH side m E 1081 0
47. r 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 001 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 Phase Shifter 9 1 iF ano HHen Tr JA Input Level Muling Detector Circuit OF On ie Muting Level Adjust Muting Switch Fig 1 Block diagram of PA3001 A 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 response 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
48. r minimum distortion Repeat steps 8 10 until the minimum distor tion point does not change Set the FM signal generator output to 100dB and adjust VR for maximum deflection at the signal meter Fig 11 gt Set the FM signal generator output to 26dB Set the MUTING switch to and adjust so that the output waveform disappears 52 11 Meter deflection AC voltmeter Connection of FM tracking adjustment 1080 9 3 Connect shown in Fig 12 set the FUNC TION switch to FM and the MUTING switch to Set the FM signal generator to 98MHz un modulated 66dB output Connect the output of the MPX SG PILOT OUT terminal to the horizontal axis 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 L tow 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 for best separation Next set the MPX SG to 7 5kHz by pilot signal 19kHz Adjust s for minimum output Fig 13 Lissajous p
49. r AEC 339 ransistor 250737 Scfew Insulator Tuner shield plate ABA 188 AKX 054 Wire clipper NN j 1 7 RT 3x6 77 Vs Dial pulley assembly Chassis 113 REN ____ _ _ Wire clipper Boss AEC 259 assembly AWE 092 27 7 ey sei Frame R GE AENG Nee Protection assembly AWM 120 eT RL Pe ED _______ _ 11 4 REAR PANEL Power ADG 013 AC socket AKP 005 4 pinjack AKB 035 T 2637 5 Input terminal assembly GWS 126 Input terminal assembly GWS 127 ERU RSEN UN testet T N NOTE Parts indicated in green type AT Antenna terminal AKA 002 cannot be supplied Bar antenna 8 505 holder 012 AKE 031 asher ABE 005 12 SCHEMATIC DIAGRAMS P C BOARD PATTERNS AND PARTS LIST 12 1 MISCELLANEOUS PARTS LIST NOTE e Capacitors in uF unless otherwise noted p pF e Resistors 2 WW unless otherwise noted k k2 SWITCH Symbol Part No Description 51 ASK 080 Lever Switch POWER 52 ASR 046 TRANSFORMERS AND COILS Symbol Part No Description T1 T22 025 Balun transformer T2 ATB 505 Bar antenna 13 24 030 Ferry inductor T4 ATT 448 Power transformer RESISTOR Symbol Part No Description R1 RD PS 225 Carbon film 2 2M R2 RS 2P 122
50. r ble If you set the TONE switch to ON and turn the BASS control to the right from its center position you will be able to emphasize the sound a frequency range whith is lower than that selected by the BASS TURNOWER switch Conversely turning this control from the center position to the left will attenuate the sound You can use the TREBLE control to adjust the frequency higher than that selected by the TREBLE TURNOVER switch 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 Press this button for broadcasts The FM STEREO indicators light up when the receiver is tuned into an stereo broadcast The sound is automatically received monophonical during FM monophonic broadcasts AM Press this button for AM broadcasts Press this button when listening to an audio component connected to the AUX input jacks LOUDNESS SWITCH Set this switch to ON when listening at a low volume The frequency response of 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 TREBLE TURNOVER SWITCH Use this switch to change over the frequency in which the sound adjustment with the TREBLE control is s
51. r 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 is PNP type dual transistor differential amplifier that amplifies the input signal and stablizes the center voltage of the power stage and are driven by the opposite phases of the output of The output Q is applied to the current mirror circuit consisting of D and and phase inverted Consequently and Qs 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 Qs The final stage is a parallel connected power amplifier FUNCTION SIGNAL meter Fig 4 Block diagram of AM tuner eo 1 60 o B 23V o 8 1080 4 82 62 2 62 Fig 5 Block diagram power amplifier Q isa 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 Q by and the input side base potential of becomes the standard Therefore the input side base po
52. re move them Switched in Unswitched 5 1080 OUTLETS Switched Unswitched A frequently used component turntable tape deck etc can be plugged into this outlet By leaving the power switch of that compo nent in the ON position power supply to the component will be coupled with the receiver switch operation Less frequently used components which do not require coupled power can be plugged into either of these outlets Left Right Speaker system SPEAKERS A Left Right Speaker system SPEAKERS B 3 FRONT 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 vary according to the frequency In order to find out the exact output level connect an 8 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 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 tha
53. t discharging rapidly and S and Qr both turning off The relay is thus opened disconnecting the output circuit Constant current source DC Voltage Detector Fig 8 1 The output circuit is connected to pin no 4 via a low pass filter R and Any DC voltages appearing in the output circuit will also be applied to pin no 4 turning 5 on Ct will thus discharge rapidly turning S 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 Rs D and Rs Due to 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
54. t is sometimes generated when the power is switched on and off SPEAKERS BUTTONS 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 FILTER BUTTONS 15Hz When this button is pressed 6dB oct attequa tion can be provided for frequencies 15Hz This means that you can cancel out rpise in the ultra low frequencies which is by low pitched rumble from a turntable and other forms of distortion Although this cannot be heard it can generate intermodula tion distortion and damage the speakers 6kHz Press this button to provide a 6dB oct tion at frequencies above 6kHz Set it 5 position when you find high frequency such as that from scratched records unpleasant FUNCTION INDICATDR BASS AND TREBLE CONTROLS Use these controls to adjust the bass and the t
55. tarting to take effect Select 2 5 2 or 5kHz in accordance with the characteristics of your listening room and of your speakers and with your general preference PHONO 2 MIC Press this button when playing record on the turntable connected to the PHONO 2 jacks or when using a microphone which you have plugged into the MIC jack PHONOT1 x 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 MIC 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 The scale is graduated in dB which indicate the attenuation when the maximum output level is OdB MUTING SWITCH Set this switch to the 20dB position to attenuate the audio output indicated by the VOLUME control 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 o
56. tential of must be main tained constant at OV The voltage generated across R by the 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 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 R and Z The attenuation at low signal input is reduced and the attenuation at large signal input is increased by using the rise of the diode current voltage characteristic at Z The compressed signal is shaped by D and applied to Q of the meter drive circuit 0 current amplifies the DC voltage from D to drive the power meter Fig 6 Schematic diagram of meter amplifier OUTPUT VOLTAGE INPUT VOLTAGE INPUT VOLTAGE Fig 7 Schematic diagram of logarithmic compressor 21 8 7 CIRCUIT The purpose this circuit is to protecty both the speakers and the power ampli
57. to and the MUTING switch to OFF Set FM signal generator to 400Hz 100 modulation 66dB output Set 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 amp 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 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 reception at 90MHz and 106MHz is perfect At this time adjust T for maximum output 5 1080 Fig 10 8 12 13 Terminal TAPE REC Adjust the 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 66dB set the SX 1080 dial bointer 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 fo
58. trol assembly AWT 001 Filter assembly GWS 124 Speaker switch assembly AWH 071 Power amplifier assembly AWR 152 Power supply assembly AWM 120 Protection and surge killer assembly AWX 125 Power transistor connector assembly GWS 126 Input terminal assembly GWS 127 Input terminal assembly GWS 128 Speaker terminal assembly ATB 505 Bar antenna AXB 012 Bar antenna holder List of changed parts information will be furnished whenever necessary and you are requested to amend parts number in this parts list List of Changed Parts for Factory Modification Description 8 1080 Transistor 1 5 1001 1457 876543 1 25 979 2 1002 z 2 001 2 1197 1234567 2SA684A TA7302P 2SA733 KA B 25 872 E 25 1384 Index 25 945 2 25 1438 25 1885 2SK34 25 1775 25 68 9 25 1906 258536 25 1915 250381 e D B 35 45 5 2547265 25 904 Gi 5 25 869 25 682 2SC1312 2SD712 2SC1914 25 55 S C 25 1919 D 254850 25 1735 Circuit Diagram HA1197 37 sx 1080 fi gi QUALIZER 125 3 e EE iin 5 224 SIGNAL VOLTAGE 140 140 80 OUTPUT DC VOLTAGE INPUT SIGNAL DC CURRENT AT NO INPUT SIGNAL FUNCTIONNEQUALIEER Ass y GW 125 2 4 SPEAKER SELECTOR METER Assy Gws 124 ITCH INPUT TERMINAL AgS y GWS 127
59. ver 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 FM MUTING BUTTON ON released position Release this button to sup press unpleasant inter station noise when tuning in to FM stations OFF depressed position Depress this button to pick up weak stations FM 25 5 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 interference POWER SWITCH 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 T

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