Pioneer SX-680 User's Manual
Contents
1. 0 25C945A Os Rss 2SA733 0 f Oh ST Quan ns m 2SCIOI9 23 S Om ine 2SA725Px2 Ar PT sm Rant 25 E 620 18 5 22 0 205 Rm 41 35 79 Rog 18K Sz a 14 Rog 200K Rove 390K Q MK S2 5 65 Bee ee sts as 73Y 560 gt E 45 C208 eS Rs Rios EN 216 22 fao 4 ies M 58 LXI spe T o 59 60 69 61 64 658 63 Qao l 2561384 u ay 0 ies sas Dus ISMA 0 Ras 33 10E2x2 1 456V 82K D 5 152472 Gal Caos dt an Lp d Gao Py 220 63 5 tein 250712 Qa 30 Rar 1 2W 2 140mA 4 2 140 Cars 33 C 60mA GA 5 Dos 306 152473 x2 Rm Cs Cana 4700P IK 0018 Rass 4k a 12K 1 Rss Rom Rw Osos soe Na 10K Co KS SKF 2SC1919 x2 1515592 LI Doi gg AAA 152413 Dii MZ 220 VOLUME Ht CONTROL j Rsm IK 4 2 100K B T 30 lt gt sab 4 E 4k 5 b Rsg4nK Ie E m 1 Cz b MN Hk Y Onn 304 s 2901438 x R VR TREBLE CONTROL Osos 504 5 VR BASS CONTROL LR2. MP NN mme m AR A An An an an m MODEL SX 680 KC S S G MODEL SX 680 COMES IN FOUR VERSIONS DISTINGUISHED AS FOLLOWS Voltage Remarks 120V only U S A model 120V only Canada model 110V 120V 220V and 240V Switchable General export model 110V 120V 220V and 240V Switchable U S Military model The variations in safety standards in different countries has also necessitated variations in power supply and circuit component specifications Furthermore the difference in the pre emphasis characteristics employed by FM broadcasting stations has also meant variations in de emphasis circuit time constant RESISTANCE VALUE CODES Code numbers of resistors used in Pioneer equipment are expressed in the following way Code number s RD PS 473 J NL Type of resistor do Power rating 4 Shape tubuler Resistance code value Tolerance lt Low noise marking Furthermore in the list of parts found in the Service Manual the resistance code value part of the above code number is expressed as 000 or 0000 Resistors included in the Service Manual list of parts RD PSOOO JNL When ordering resistor components first ascer tain the actual resistance value from the circuit diagram and then convert it into code no form as shown in the following examples For further details on code num
3. ED 9402 CRANE E 2561384 Can 0041 A 35 504 ergy Dass ISMA 192472 Sal 250712 m Ex I0E2 220 53 Ban 4 OW SY I Son E fen 1 Car Uso 6 8 6 Rns150 Rez U 51 i d 9 oOo 2SA733 Er Rss Oso T 13K Cete m 2SA726Sx2 0509 152473 02 25 945 27 oe ise at Sk yt vet 7 2 140 9 8 Dus H 0 047 Dace oo Davis 24 K261 x4 VR Rm Gn OQ Ge OP 0018 Rass Rast Ry 4k 150K 12K C sos soe 25 1919 x2 8 Bou 47K 152475 Os 2 220 C sw 14K 1 foa 1515552 501 wy VOLUME CONTROL CONTROL VR asan SIM Bn ix RITU 3300 Luc 155 L 7 Rgn 8 A Reed tk lt 8 Q 5 504 25 117 2 PK Gn 4 100 Rus 90 2801438 x2 VR TREBLE CONTROL VR a2 BASS CONTROL c NE 0 HOOP SxX 680 KC 10 Parts List of Main Board Assembly GWM 118 COILS AND FILTERS Part No ATF 013 ATF 034 ATF 038 ATE 040 ATB 013 ATH 022 SWITCHES Part No ASE
4. L D be fas yy qas rfi ASSEMBLY GWX 179 PHONO Sup sols Dent Le 1 5214 4 iere of fore HEADPHONES TAPE ASSEMBLY GWX 186 Re SPEAKERS B SPEAKERS A 2 pu P j ee ae ouf 9 4 FM FRONT END GWB 101 Parts List L TC Q 3SK59 Rio256 La VC TC 0 256535 Fo BV Rio f A b 20 20V lt Q Cm 18P Note When ordering resistors convert the resistance value into code form and 9 5 TAPE ASSEMBLY GWX 186 REC PLAY PLAY REC 9 6 DE EMPHASIS SWITCH ASSEMBLY GWX 180 SX 680 9 7 PHONE JACK ASSEMBLY GWX 179 m 2W Jem 14375780 CE 3780 FORTEM SP at 1 Cis i n 41 Cios Part No Symbol amp Description C R 68 0 01 Part No Symbol amp Description m ipo OK RD PS 151J R349 R350 d AKB 045 Terminal TAPE AKN 009 Phone jack PHONE 9 8 FUSE HOLDER ASSEMBLY GWX 178 Parts List Part No Description AKR 013 Fuse clip 9 9 INDICATOR ASSEMBLY GWX 177 COIL AND TRANSFORMER RESISTORS then rewrite the part no as before Part No Symbol amp Description Part No Symbol amp Description T24 028 L6 Choke coil 2 2uH RDXPS 000 J R101 R103 107 R112 R113 R166 R167 fe 05 M IF R111 Parts List ATE 039 T1 F T RD VS 000 J R102 R108 R11 rts sos SOURCE Part N Symbol amp Descripti GRN ar scription CAPACITORS SEMICONDUCTORS
5. ees asov P 1 1 E n Ran 9 d 50 ils 2 77 Gub 100P 73 51 58 Jon Ou 22 50 5 n 23 DL Rm PHONO R 150K 4n0 4 Con 1 25 254733 2501384 p 2 0 152472 250712 lt 40 Daos MZ 140 152413 x2 Ln 22uH Can 0 047 Q 13 16 o4 407 SR3AM 8 x4 Ge 0041 VAL LR Bw Das Qe detur Cay il 004 Gs 39 55 210000 1 Rare 2 7K ONO Ras Do T5o 6 4 Q La 2QuH 2 1K261 x 4 25 1919 x2 C 2SC945A 8 me E 680 RAE 7 4 1 5 ayso 05 Rsus41K Deos C 1524 162413 aj VOLUME CONTROL OF 5 Rss z 10K Dan co 15 1 555 2 iE sl PS do al 25760039 GEI AES E Ran 22075 Vr UM Ru nw 100 25 438 2 VR wi TREBLE CONTROL VR BASS CONTROL one Amik Mane fi 010 FOP sx 680 S S G 18 Parts List of Main Board Assembly GWM 119 COILS AND FILTERS Part No ATF 013 ATF 034 ATF 038 ATE 040 ATB 013 ATH 022 SWITCHES Part No ASE 107 ASG 140 ASG 138 ASG 139 CAPACITORS Part No CCDSL 221K 50
6. 5 AXA 113 5 nt Power transformer xy gs ATT 511 FM front end GWB 101 Fuse 1 5A AEK 104 Ceramic capacitor AEK 5 109 0 01uF 125V ACG 003 Insulator cover AEC 279 Rear Panel View Slide switch DE EMPHASIS Terminal ANT ASH 015 A UOS EANAN Terminal SPEAKERS AKE 026 Terminal GND AKE 031 Ferrite bar antenna ATB 505 Terminal INPUT AKB 035 AC socket AC OUTLETS AC power cord AKP 004 Terminal TAPE 1 ADG 023 AKB 035 Terminal TAPE 2 Antenna holder AKB 045 AXB 012 72 7 DIAL CORD STRINGING Remove front panel See page 10 Remove the tuning drum from the tuning capa citor shaft Tie one end of the string to the stud on the inside of the tuning drum Set the tuning capacitor to its maximum capacity with the vanes fully meshed Attach the tuning drum to the tuning shaft so that the fixing screw head is pointing exactly upwards Draw the string out through the gap cut in the tuning drum and after passing it half way round the drum thread it successively over the pulleys A B C gt Three times around OH ASS de Tuning drum 2 Tuning shaft 2 Sex Fixing screw Stud 10 11 SX 680 Pass the string over pulley D after having wound it three times around the tuning shaft in a clockwise direction as viewed from the rear Tie the other end of the string to the hook on the spring s
7. 519 TOLERANCE CAPACITORS IN F UNLESS OTHERWISE NOTED pF Aux SIGNAL VOLTAGE AT SOW 304 82 OUTPUT 1kHz OC VOLTAGE AT NO INPUT SIGNAL 25 725 Dp Rinxok Ans NK DC CURRENT AT INPUT SIGNAL L ch a de i Dus mE y s DC VOLTAGE 30W OUTPUT we S D fo MzZ 220 p This is the basic schematic diagram but the actual Phono 353 QS K E PHONO Circuit may vary dye to improvements in design I 2 0 L T4 um e per PHONO blues MM Ormes 25019194 gt Cr 22 85 Ex EE po Ou D wa EN 7 2SCI438x m Rs mme BK VR TREBLE CONTROL WA VR BASS CONTROL 2SKH T M sp 2 LE Kw log TAPE RED INDICATOR Ass y Din SOURCE GRN GWX 177 STEREO ES lt Reh Len MONITOR 1 Ass y GWX 188 14 15 SX 680 S S G 0 25 46 Ps 10S fi sf Riga 100 Me 52 152076 4 5 6 Qs 1197 15 4 ens SY Qawaman 2SCIBI X4 S d 56 Qua 204 2SA725P x2 Ripon Ras C mM 100K Ri 1 3 4 5 1 8 PA1001 A 16 15 8 29 0 3 1 19 o 10 3 V3 0 i 2 0 POND L gt 59
8. FUA Fuse List of changed parts information will be furnished when ever necessary and you are requested to amend parts number in this parts list P C BOARD ASSEMBLIES Description Part No Part No Description GWM 117 Main board assembly GWX 179 Phone jack assembly GWX 180 De emphasis switch assembly GWB 101 FM front end GWX 186 Tape assembly GWX 178 Fuse holder assembly GWX 177 Indicator assembly 17 Block Diagram of ICs PA3001 A MUT QUAD INPUT BAS 60 IN OUTPUT MET OJI Analog Switch Meter Onver MUT 0 GND 5 MUT OC lf MEL AUTO AD NT PA1001 A COMP Sl ST AUTO Vee IN OUT Rout STIND GND IN Lamp Driver ii Divider ii 3 Phase al KILL OR _ PEL H PILOT PILOT IN ADI LR IN CANCEL ADI HA1197 RF Nec RE RF AMP IF AMP AMP IN 050 OUT MIXER OUT OSCIN MIXER IN S METER AGC IN IFAMP DET OUT GND IF AMP IN Vee QUT 18 External Appearance of Transistors and ICs 3SK59 250461 25 535 001 1001 1197 25 725 2547265 25 1919 254798 254733 2SC945A 25 1438 250712 250313 25 1384 25 117 2SK34 rhe 11213141516 B BI B2 E G TES 5 680 3 5 6 The indicated semiconductors are representative ones only Other alternative semiconductors ma
9. Vinyl pouch E11 024 Side pad L AHA 197 Operating instructions ARB 268 Sheet cover AHG 090 Side pad R AHA 198 T type FM antenna ADH 002 Vinyl pouch AHG 023 Z Packing case AHD 551 29 11 EXPLODED Screw 4x15 ABA 209 Front panel assembly ANB 596 Screw 3x6 ABA 064 IQ Washer M9 5 9 45 086 4 Nut M9 MEC B7 1 004 Screw 3x6 7 ABA 064 BN 9 Washer M9 Knob BASS TREBLE AAB 175 Tos SE 45 086 D i 25 C OP Knob FUNCTION AAB 175 Knob TUNING AAA 050 Knob BALANCE AAB 176 Screw 3x8 ABA 002 Knob VOLUME AAB 175 Screw 3x10 Foot assembly ABA 082 ANR 022 3 NOTE marked parts cannot be supplied Wooden cover assembly AMM 071 Screw 4x15 ABA 209 Screw 3x8 ABA 002 ANR 022 30 B SX 680 2 NOTE Ground terminal 2 P _ marked parts cannot be supplied See the next page Screw 3x6 E ABA 048 crew 3x8 Screw 3x8 P d ABA 002 3 ABA 049 Acrylic board __ lt ANRO 7 ower transformer ATT 511 Lamp wedge type 8V 0 3A AEL 029 Screw 3x8 ABA 002 Screw 3x6 ABA 048 P d Lamp s cket AKK 005 Nylon rivet Screw 3x8 T AEC 384 ABA 002 Fuse 1 AEK 104 rM front end Screw 3x8 GWB 101 Screw 3x6 ABA 066 Screw 3x10 ABA 048 Pulley assembly Indicator ass
10. AM FM STEREO RECEIVER X 680 U PIONEER MODEL SX 680 COMES IN FOUR VERSIONS DISTINGUISHED AS FOLLOWS Type Voltage Remarks KU 120V only U S A model KC 120V only Canada model 110 120V 220 and 240V Switchable General export model 110V 120V 220V and 240V Switchable U S Military model MODEL SX 690 COMES IN THREE VERSIONS DISTINGUISHED AS FOLLOWS HG 220V and 240V Switchable United Kingdom model HGW4 220V and 240V Switchable Europe or Oceania model Although the basic features of models SX 680 and SX 690 are the same there are a few minor changes in design The variations in safety standards in different countries has also necessitated variations in power supply and circuit component specifications Furthermore the difference in pre emphasis characteristics employed by FM broad casting stations has also meant variations in de emphasis circuit time constant This service manual is applicable to the SX 680 KU For servicing of the other types please refer to the ad ditional service manuals CONTENTS 1 SPECIFICATIONS 3 9 SCHEMATIC DIAGRAMS P C BOARD 2 FRONT PANEL FACILITIES 5 PATTERNS AND PARTS LIST 3 BLOCK DIAGRAM 7 9 1 Miscellanea 17 4 CIRCUIT DESCRIPTIONS 9 2 Schematic Diagram 19 Ba Tuner Sections es can pers a 8 9 3 P C Board Connection Diagram
11. Use this to tune in to broadcasting stations Select the station and tune for optimum reception by observing the dial scale and the AM FM tuning meter 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 MIN LOUDNESS SWITCH Depress this button ON position 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 BALANCE CONTROL Use this control to balance the volume of the left and right channels First however set the mode select switch MODE FM MUTE to MONO 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 adjusting return the mode select switch MODE FM MUTE to STEREO TAPE MONITOR SWITCHES 1 2 Depress the switch 1 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 d
12. p Dsog sog AE L 30 7 x2 Osos STEREO sei ASH 015 S8 Slide switch DE EMPHASIS gt 0 AEL308 RED Part No Symbol amp Description Part No Symbol amp Description 113150 C517 C518 507 5 CCDUJ 120K 50 C101 3SK59 Y or GR 01 CCDSL 220K 50 C102 3SK73 Y or GR i CKDYF 1032 50 C103 C104 C107 C109 C115 C171 2SC535 A or B Q2 Parts List CCDUJ 150K 50 C105 25 461 or C Q3 CCDSL 150K 50 C106 Part No Symbol amp Description CGB R47K 500 C110 221P 6 C517 CCDPH 180K 50 C111 RD PS 471J R539 CCDLH 080F 50 C112 RDAPS 821J R540 CCDPH 330K 50 C113 1 3 D506 0508 LED red CCDCH 150K 50 C114 TAEL 308 D507 LED green CCDSL 101K 50 C116 ACK 012 VC Tuning capacitor ACM 006 TC3 Ceramic trimmer 23 24 2 MAIN BOARD ASSEMBLY GWM 117 gt TP TP GG EXE 2205 5 ee ee Qui T ars T xc Q 2SC46l T V TO or Ras F2 Rus 410 E Gf xc Cy ast ol Din 4 5 6 152076 05 001 F 16 1 14 142 512 Tey 742 13K 5 6 17 8 Q PATOOI A B 5 2 12 n 10 3 C 160 Ca 94 56 25V 125 25 24v 24v 08 9n i i perpe v Lum Tq bum ioci 7 R 41 255 7 8 A xc 820P Res 5 1197 Tis pk Ce i 4 29 2 10 9 Bay 5150 0068 m 7 gt
13. 100 336 112 2 For 000 Codes General resistors D D D Significant figures Multiplier 10X Resistors with fractional values a D D ORO Significant figures Decimal point Ex 2 Nominal resistance Significant figure Multiplier Resistance Q two figures 10X value code 0 5 1 5 1 22 330 1k 1000 5 6k 5600 68 68000 820k 820000 1M 1000000 2 2M 2200000 SX 680 3 BLOCK DIAGRAM ANTENNA 2 O FM 3000 RF AMP MIXER F J IF AMP S PASO A IC PA 1001 no NE RPM 750 EMPHASIS AF GNO LOCAL AM C ose I L Q9 CFM 62 25y8 75ys FRONT END ch gt MUTE STEREO S 2 1c nae 5 AM TUNER sc AM FM METER TE METER DRIVE HA OUTPUT 355dB FUNCT ION 248 d POWER L ch at Ik Hz re Mon ITOR Kari at kHz at IkHz 45 METER 52 9 BUFFER MUTING POWER AKERS PHONO EQ AMP OS re B AMP GATE kasa 4 AUX O 09 09 0 8 LOUDNESS UE AH CONTROL Wa PHONE REAY SOURCE GT REC TAPE2 PLAY TAPE france MONITO TO POWER STAGE B 8 Booe R DIAL SCALE ren LAMPS AC POWER 4 CIRCUIT DESCRIPTIONS 4 1 TUNER SECTION FM Front end The FM front end consists of a 3 ganged tuning capacitor a dual gate MOS FET equipped 1 stage RF amplifier a local oscillator and a mixer The output of the local oscillator a modified Clapp circuit
14. 21 4 2 Audio Section 8 94 FM Frontend GWB 101 23 By DISASSEMBLY 10 25 Tape Assembly GWX T88y us cs 21 6 PARTS LOCATION 11 98 De emphasis Switch Assembly GWX 180 24 7 DIAL CORD STRINGING 13 Oe r Phong Assembly T 8 ADJUSTMENTS 9 8 Fuse Holder Assembly GWX 178 24 81 14 9 9 Indicator Assembly GWX 177 24 8 2 16 9 10 Main Board Assembly GWM 117 25 10 29 11 EXPLODED VIEW 30 1 SPECIFICATIONS Semiconductors du P 3 ICS EP 5 Transistors ee date 21 Diodes Sesso Yk Up hug Wad eR e 29 Amplifier Section Continuous Power Output of 30 watts per channel min at 8 ohms or 37 watts per channel at 4 ohms from 20 Hertz to 20 000 Hertz with no more than 0 196 total harmonic distortion Total Harmonic Distortion 20 Hertz to 20 000Hertz from AUX continuous rated power output No more than 0 1 15 watts per channel power output 8 No more than 0 0896 1 watt per channel power output 8ohms iss Rue No more than 0 0596 Intermodulation Distortion 50 Hertz 7 000 Hertz 4 1 from AUX continuous rated power output No more than 0 1 15 watts per channel power output Sohms esl
15. C324 C134 C135 C325 C326 C327 C328 C329 C330 C331 C334 C167 C501 C336 C125 C407 C335 Part No CEA 221P 6 CEA 470P 25 CEA 100P 16 CEA 331P 35 CKDYF 4032 50 CKDYF 1032 50 CEA 221P 16 CEA 331P 16 COMA 473K 50 CQSH 511J 50 CEANL 010M 50 CSZA 6R8M 6 CKDYB 821K 50 CKDYB 182K 50 CKDYB 471K 50 CKDYB 222K 50 CCDXL 080F 50 CEA 220P 16 CKDYB 102K 50 CKDYB 122K 50 683K 50 ACG 009 CEA 221P 63 CEA 221P 35 CEA 221P 50 CEA 101P 25 ACH 082 CQSH 331J 50 CQMA 333K 50 CEA 2R2P 50 CCDSL 331K 50 CQMA 223J 50 CEANL 4R7P 25 CEA 101P 35 CEA 010P 50 CEA R47P 50 RESISTORS Part No C92 051 ACV 186 ACV 161 ACT 019 SxX 680 Symbol amp Description C164 C502 C221 C156 C405 C117 C163 C126 C128 C157 C160 C162 C131 C143 C133 C136 C137 C138 C141 C139 C140 C144 C145 C146 C147 C148 C149 C154 C158 C159 C166 C170 C401 C402 C409 C412 Ceramic 0 047 150V C403 C404 C415 C406 C408 C413 C414 Electrolytic C155 8000 50V C169 C416 C503 C504 C505 C506 C507 C508 C513 C514 C124 C129 C142 C150 C151 Note When ordering resistors convert the resistance value into code form and then rewrite the part no as before Symbol amp Description VR1 Semi fixed VR301 VR302 Variable TREBLE BASS Variable VOLUME Variable BALANCE 4 7k B VR501 VR502 27 Part No Symbol amp
16. CKDYB 821K 50 CKDYB 182K 50 CKDYB 471K 50 CKDYB 222K 50 CCDXL 080F 50 CEA 220P 16 CKDYB 102K 50 CKDYB 122K 50 CQMA 683K 50 ACG 009 CEA 221P 63 CEA 221P 35 CEA 221P 50 CEA 101P 25 ACH 082 331J 50 CQMA 333K 50 CEA 2R2P 50 CCDSL 331K 50 CQMA 223J 50 CEANL 4R7P 25 CEA 101P 35 CEA 010P 50 CEA 4R7P 50 RESISTORS Part No C92 051 ACV 186 ACV 161 ACT 019 SX 680 KC Symbol amp Description C164 C502 C221 C405 C117 C156 C163 C126 C128 C157 C160 C162 C131 C133 C136 C137 C138 C139 C140 C144 C146 C148 C154 C158 C159 C166 C170 C143 C141 C145 C147 C149 C401 C402 C409 C412 C403 C404 C415 C406 C408 C413 C414 Electrolytic C155 C169 C416 Ceramic 0 047 150V 8000 50V C503 C504 C505 C506 C507 C508 C513 C514 C124 C129 C142 C150 C151 Note When ordering resistors convert the resistance value into code form and then rewrite the part no as before Symbol amp Description VR1 Semi fixed 4 7k B VR301 VR302 VR501 VR502 Variable TREBLE BASS Variable VOLUME Variable BALANCE Part No RD PS 000 J RD PS 000 J RD PS DDD J RD PS DDD J RD PS 000 J RDXPS DDD JNL RD4PS DDD J RD VS OOO J RN SQ DOOD ACN 030 RFAPS 000 J RS2P 000 J RS1P 000 J ACN 029 Symbol amp Description R114 R135 R137 R149 R151 R154 R156 R163 R165 R201 R
17. Description Part No RDYXPS DOO J R114 R135 R137 R149 R151 R154 MZ 140 RD APS og R156 R163 R165 WZ 140 RDYXPS 000 J R201 R204 R209 R229 R301 R318 RD 4PS DDD J R323 R348 152472 RD APS 000 J R403 R407 R501 R538 151554 5 OOO JNL R205 R208 2 220 RD4PS DOO J R150 R155 R319 R322 2 220 RD 4VS 000 J R164 2 061 RN SQ QODOOF R136 WZ 061 ACN 030 R351 R354 Wire wound 0 22 2W RFPS O00 J R401 R410 RS2P 000 J R402 RS1P 000 J R408 R409 OTHERS ACN 029 R541 Carbon composition No 2 2M AW P rt No AKR 013 SEMICONDUCTORS AKH 014 ANH 203 Part No Symbol amp Description ABN 024 ABN 047 25 461 or C Q4 PA3001 A Q5 PA1001 A Q6 2SA726S G or F 07 Q8 25 750 or F 1197 Q9 28C1919 G or F Q201 Q202 Q205 Q206 Q505 Q506 25 1400 28A725P F or G 28A798 F or G 25 1438 or B 28D712 C or D 28D313 D or E 28C1384 Q or R 28A733 Q or R 28C945A O or 28K117 GR or Y 25 34 or D 152076 152473 151555 151555 152473 152473 181555 2 1 K261 MZ 130 WZ 130 10E2 51801 02 SR3AM 8 30D4 28 Q203 Q204 Q301 Q302 Q303 Q304 Q401 Q402 Q501 Q502 Q503 0504 D101 D102 D103 D307 D308 D403 0405 D306 D502 D504 0301 0304 D309 0401 D402 D404 D407 Symbol amp Description D408 D409 D501 D505 Description Fuse clip IC socket Heat sink Washerfaced nut Union nut SX 680 10 PACKING
18. FM signal generator 3002 3002 ANT TERMINAL dummy f COUT REC TERMINAL EXT MOD Multitester AC voltmeter 9 Distortion meter AN Oscilloscope MPX signal generator 2 10 1 probe 00500 VR 0 9 q q c crr c Q TP 22 VERT HORIZ PILOT OUT OUT Fig 7 Connection diagram 15 8 2 AM TUNER l Connect up the test instruments as shown in 9 Set the SX 680 dial indication and AM SG fre Fig 8 quency for 600kHz 2 Set the FUNCTION switch to AM 10 Adjust T and bar antenna core for maximum 3 Set AM Signal Generator AM SG for 400Hz reading on AC voltmeter 30 modulation 100dB output 11 Set the SX 680 dial indication and AM SG fre 4 Set the SX 680 dial indication and AM SG fre quency for 1 400kHz quency for 600kHz 12 Adjust TC and TC for maximum reading on 5 Adjust T core for maximum reading on AC voltmeter voltmeter 13 Repeat steps 9 to 12 alternately until adjust 6 Set the SX 680 dial indication and AM SG fre quency for 1400kHz 7 Adjust TC for maximum reading on AC volt 14 meter 8 Set AM SG for 30dB output AM signal generator AM ANT TERMINAL qai 1kQ resistor Oscilloscope AC voltmeter Fig 8 Connection diagram ment at the one frequency requires no further re adjustment at the other frequency Adjust F core for give
19. 107 ASG 140 ASG 138 ASG 139 CAPACITORS Part No CCDSL 221K 50 CEANL 2R2P 50 CEANL R47M 50 CEANL 470P 25 CCDSL 100F 50 CEA 101P 10 CKDYA 302 50 CCDSL 101K 50 CKDYA 103J 50 CEA 4R7P35 CKDYF 473Z 50 CKDYF 473Z 50 472 50 CKDYA 472 50 CCDSL 560K 50 CCDSL 470K 50 CEA 220P6 CEA 470P35 CCDSL 330K 50 CCDSL 471K 50 CQMA 183J 50 CQMA 472J 50 104 50 273 50 CEANL 100 16 CEA 3R3P50 CEA 470P16 CEA 470P50 11 Symbol amp Description F1 F2 FM ceramic filter F3 AM ceramic filter F4 455 kHz BPF T2 FM DET T3 AM osc coil L7 Micro inductor Symbol amp Description 1 Slide rotary FUNCTION S2 S3 Dual push TAPE MONITOR 1 2 S4 S5 Push MODE FM MUTE LOUDNESS S6 7 Dual push SPEAKERS Symbol amp Description C201 C202 C222 C223 C203 C204 C211 C212 C511 C512 C301 C302 C205 C206 C207 C208 C509 C510 C515 C516 C209 C210 C313 C314 C213 C214 C215 C216 C120 C152 C153 C217 C218 C219 C122 C132 C165 C220 C319 C320 C118 C119 C121 C123 C130 C168 C134 C135 C303 C304 C305 C306 C309 C310 C311 C312 C315 C316 C317 C318 C321 C322 C323 C324 C325 C326 C327 C328 C329 C330 C331 C334 C167 C501 C336 C125 C407 C335 Part No CEA 221P 6 CEA 470P 25 CEA 100P 16 CEA 331P 35 CKDYF 4032 50 CKDYF 1032 50 CEA 221P 16 CEA 331P 16 COMA 473K 50 511J 50 CEANL 010M 50 CSZA 6R8M 6
20. AEK 103 AEK 103 Viny pouch for fuses E11 033 E11 033 FM FRONT END GWB 103 The circuitry of the FM front end GWB 103 is the same as the GWB 101 for KU type with exception of the part installation method MODEL SX 680 KC SCHEMATIC DIAGRAM FOR KC TYPE MAIN BOARD Ass y 118 1 2 FM FRONT END Ass y GWB 103 777 EI rur MT 20 FM 3002 BALANCE 752 25 x UNBALANCE 5 001 GND L VO Ce 22P 1 M 8 lm m 4 SWITCHES 1 FUNCTION LOUDNESS AM OFF ON FM SWITCH Ass y DE EMPHASIS don s Gwx 180 DIAL ILLUMINATE LAMP 00 Em 2501384 Suv Dua 25 192472 250712 AUX 1 2 3 PHONO SPEAKER 4 DFE ON 0033 2 TAPE MONITOR 1 SEE 0N ew een DE EMPHASIS F4 AM 151555 3 MONITOR 2 Sys Sus OFF ON TUNING SIGNAL 1 S 55 POWER METER 5 FM MUTE MODE ON INZ STEREQ OFF MONO RESISTORS IN OHM 1 4W 15 TOLERANCE UNLESS OTHERWISE NOTED M MQ F 51 TOLERANCE CAPACITORS IN yF UNLESS OTHERWISE NOTED Pp pF 557 SIGNAL VOLTAGE 90 304 80 QUTPUT kHz Qawaman 25 1919 A OC VOLTAGE NO INPUT SIGNAL DC CURRENT AT NO INPUT SIGNAL L ch DC VOLTAGE AT 30w OUTPU
21. CEANL 2R2P 50 CEANL R47M 50 CEANL 470P 25 CCDSL 100F 50 CEA 101P 10 CKDYA 302J 50 302 50 CCDSL 101K 50 CKDYA 103 50 103 50 CEA 4R7P 35 CKDYF 4732 50 CKDYF 4732 50 CCDSL 560K 50 CCDSL 470K 50 CEA 220P 6 CEA 470P 35 CCDSL 330K 50 CCDSL 471K 50 183 50 472J50 104 50 273 50 CEANL 100 16 CEA 3R3P 50 CEA 470P 16 CEA 470P 50 19 Symbol amp Description F1 F2 FM ceramic filter F3 AM ceramic filter F4 455 kHz BPF T2 FM DET T3 AM osc coil L7 Micro inductor Symbol amp Description S1 Slide rotary FUNCTION S2 S3 Dual push TAPE MONITOR 1 2 S4 S5 Push MODE FM MUTE LOUDNESS S6 7 Dual push SPEAKERS Symbol amp Description C201 C202 C222 C223 C203 C204 C211 C212 C511 C512 C301 C302 C205 C206 C207 C208 C509 C510 C515 C516 C209 C210 C313 C314 C213 C214 C215 C216 C120 C152 C153 C217 C218 C219 C122 C132 C165 C220 C319 C320 C118 C119 C121 C123 C130 C168 C303 C304 C305 C306 C309 C310 C311 C312 C315 C316 C317 C318 C321 C322 C323 C324 C134 C135 C325 C326 C327 C328 C329 C330 331 334 C167 C501 C336 C125 C407 C335 Part No CEA 221P 6 CEA 470P 25 CEA 100P 16 CEA 331P 35 CKDYF 4032 50 CKDYF 1032 50 CEA 221P 16 CEA 331P 16 CQMA 473K 50 CQSH 511J 50 CEANL 010M 50 CSZA 6R8M 6 CKDYB 821K 50 CKDYB 182K 50 CKDYB 471K 50 CKDYB 222K 50 C
22. No CQMA 113J 50 COMA 562J 50 ASH 017 SX 680 S S G Symbol amp Description C517 C518 C519 C520 S8 Slide switch OTHERS Part No AKB 045 AKP 011 Description Terminal TAPE 2 Connector socket REC PLAY 21
23. STEREO L cave eek mae date ans 0 25 Frequency Response 30Hz to 15 000Hz 92 dB Capture 1 0dB Selectivity 4 y a ace phe RU a 60dB Spurious Response Ratio 65dB Image Response Ratio 65dB IF Response 90dB AM Suppression Ratio 50dB Muting Threshold 19 2dBf 10uV Stereo Separation 40dB 1kHz 30dB 30Hz 15kHz Subcarrier Production Ratio 50dB SCA Rejection Ratio 65dB Antenna Input 300 ohms balanced 75 ohms unbalanced AM Section Sensitivity IHF ferriteantenna 300uV m ext antenna 1SuV Selectivity e 4o HAS apa 26dB Signal to Noise 50dB Image Response Ratio 40dB IF Response 40dB Antenna Built in Ferrite Loopstic Antenna Miscellaneous Power Requirements 120V 60Hz Power Consumption 95W UL 210VA CSA Dimensions 435 W x 144 5 H x 314 D mm 17 1 8 W x 5 5 8 H x 12 3 8 D in Weight Without package 8 9kg 191 902 With package 10 3kg 2216 1102 Furnished Parts FM T type antenna 1 Operating instructions 1 Measured pursuant lo Federal Trade Commission s Trade Regulatio
24. T to give a minimum level of distortion 21 Repeat the steps detailed in section 17 to 20 for the adjustment of the primary and secon dary cores of T until both requirements are fully met 22 Set the SX 680 dial indication and FM SG fre quency for 98MHz 23 Set the MODE FM MUTE switch to the ON and check the muting threshold If the muting threshold is more than 28dB cut the jumper lead A Multiplex Decoder 24 Connect a MPX Signal Generator MPX SG to the external modulator terminals of the FM SG 25 Connect the 19kHz pilot output signal from the MPX SG to the X plates horizontal input of an oscilloscope and use a probe to connect the Y plates vertical input to the TP termi nal 26 Set the FM SG output to 66dB unmodulated 27 Adjust VR to freeze motion of the resulting Lissajous figures NOTE Lissajous figure adopts the general form shown in Figure 6 due to the fact that the MPX SG 19kHz pilot signal output is a sine wave and the TP terminal carries a 76kHz saw tooth wave as determined by the adjustment of VR SX 680 28 Turn the FM SG modulation mode setting to external modulation 29 Adjust the MPX SG modulation settings to 1kHz L 90 modulation 67 5kHz devia tion with 10 pilot modulation 7 5kHz deviation 30 Adjust the core of T for minimum distortion in the 1kHz demodulated output from L or 4 Fig 6 Lissajous figure
25. deeem No more than 0 0896 1 watt per channel power output iu ok e seme No more than 0 0596 Damping Factor 20 Hertz to 20 000 Hertz 8 ohms 25 Input Sensitivity Impedance PHONO isa messes 2 5mV 50 kilohms AUX parents eol 150mV 50 kilohms TAPEPLAY use dues 150mV 50 kilohms TAPE PLAY 2 age 150mV 50 kilohms PHONO Overload Level 1kHz T H D 0 1 200mV Output Level Impedance PAPE REC Reisk E 150mV 2 Z da se uc ER 150mV SPEAKERS sets ee A B A B HEADPHONES Low impedance Frequency Response PHONO RIAA Equalization 30Hz to 15 000Hz 0 5dB AUX TAPE PLAY 5Hz to 100 000Hz 3dB Tone Control BASS Su pe cire SS 8dB 8dB 100Hz TREBLE 10dB 10dB 10kHz Loudness Contour Volume control set at 40dB position Date GR S RS 6dB 100Hz 3dB 10kHz Hum and Noise IHF short circuited A network rated power FM Section Usable Sensitivity 10 8dBf 1 9uV 50dB Quieting Sensitivity MONO eio ER Lee eee 16 7dBf 3 8uV STEREO Li exe emi 36 7dBf 38uV Signal to Noise Ratio at 65dBf MONO Au incessere sha RS 80dB STEREO iue eeu UR AEN 70dB Distortion at 65dBf 100Hz MONO 0 07 STEREO on Race notera 0 1596 1kHz 0 07 STEREO x Rc ei ERE 0 1596 6kHz MONO 0 2
26. reception of weak radio stations when tuning in to the FM broadcasting station NOTE Recording stereophonically with the mode select switch MODE FM MUTE in the MONO position may cause deterioration in channel separation MOOR PN mute nao MODE FM MUTING SWITCH DIAL POINTER FUNCTION E MONO cen a m t OM aux rors OO This pointer indicates the broadcasting stations STEREO INDICATOR This indicator lights up when the receiver is tuned in to receive a stereo broadcast AM FM TUNING METER When tuning in to FM stations position the meter pointer in the center of FM area for optimum reception In the case of AM stations tune for maximum meter deflection toward the right of the scale vox MONITOR OX MAX M PIONEER neceiver sx eeo FUNCTION SWITCH Use this switch to select the program source For a second after the switch is selected no sound will be heard This is due to the operation of the muting circuit which mute the unpleasant switching noise generated when the FUNC TION switch is selected AM When listening to AM broadcasting FM When listening to FM broadcasting The STEREO indicator lights up when the receiver is tuned in to an FM stereo broadcast PHONO When playing a record on the turntable con nected to the PHONO jacks When listening to an audio component con nected to the AUX jacks TUNING KNOB
27. the FUNCTION switch But since this is a non shorting type selec tor switch the B being applied to the base of will be interrupted whenever the position of the 2 2 TAPE MONITOR SWITCHES Bi 22V selector switch is changed Both and will thus be turned on temperarily As a result the potential at point A will be reduced to B fol lowed by the FET being turned off and the power amplifier stage being muted However once the FUNCTION selector switch has been completely switched to the next position B will again be applied to the base of Q resulting in Q and being turned back off The potential at point A will consequently increase at a speed determined by the R C time constant until the FET is turned on and the muting condition terminated Note that when the TAPE MONITOR switch is ON Q will be disconnected from Q so the power amplifier stage wil no longer be muted when the FUNCTION selector is operated POWER AMPLIFIER 34 5V Fig 1 Basic circuitry of muting circuit POWER ON O POINT A 0 81 MUTING Fig 2 Voltage changes of different points POWER OFF 82 FUNCTION CHANGE 5 DISASSEMBLY Wooden Cover Remove the two screws on each side of the wood en cover Bottom Plate Remove the ten screws to detach the bottom plate Front Panel Remove all the knobs by pul
28. the maximum reading on the AC voltmeter 9 SCHEMATIC DIAGRAMS P C BOARD AND PARTS LIST 9 1 MISCELLANEA NOTE When ordering resistors first covert resistance values into code form as shown in the following examples Ex 1 When there are 2 effective digits any digit apart from 0 such as 560 ohm and 47k ohm tolerance is shown by J 5 and K 10 SX 680 PATTERNS 5602 56 x 10 SEL 465 RDAPS 5617 4750 47 x 10 473 RDYPS 47 3 J 0 52 eus PEE RN2H ORIS IQ LO aa RU RSIP Q K Ex 2 When there are 3 effective digits such as in high precision metal film resis tors 5 62k2 562x 10 5621 RN4SR 562 1 Miscellaneous Parts OTHERS Part No Symbol amp Description CAPACITORS ATT 511 T1 Power transformer Part No Symbol amp Description ATB 505 T2 Ferrite bar antenna ASG 503 59 Push switch POWER ACG 001 C1 Ceramic 0 01 250V ACG 003 C2 Ceramic 0 01 125V AAW 089 AM FM meter AAW 091 POWER meter SEMICONDUCTORS AKA 003 Terminal ANTENNA AKE 026 Terminal SPEAKERS Part No Symbol amp Description AKE 031 Terminal GND STK 0039 01 02 035 Terminal INPUT AKB 035 Terminal TAPE 1 AKP 004 AC socket AC OUTLETS LAMPS AND FUSES AKK 005 Lamp socket ADG 023 AC power cord Part No Symbol amp Description AEL 029 PL1 PL3 wedge type 8V 0 3A AEK 100 FU1 Caan List of Changed Parts for Factory Modification AEK 104 FU2 Fuse 1 5A AEK 108
29. 0 or E 25 1384 2SA733 Q 2SC945A Q 25 117 or Y 25 34 or D 152076 182473 151555 151555 152473 152473 2 1 261 2 130 02 130 10E2 SIBO1 02 Symbol amp Description Part No R114 R 135 R137 R149 R151 R 154 SR3AM 8 R156 R 163 R165 30D4 R201 R 204 R209 R229 R301 R314 MZ 140 R323 R346 R348 WZ 140 R403 R407 R501 R538 152472 181554 R205 R 208 R150 R155 R319 R320 MZ 220 R164 WZ 220 R136 MZ 061 R351 R354 Wire wound 0 22 2W WZ 061 R401 R410 R315 R318 R347 R402 OTHERS R408 R409 R321 R322 Fart No AKR 013 AKH 014 ANH 203 Symbol amp Description ABN 024 ABN 047 Q4 05 06 07 O8 ag 0201 0202 0205 0206 0505 0506 0203 0204 0301 Q302 0303 0304 0401 0402 0501 0502 0503 0504 0101 0102 0307 0308 D103 0305 D306 D403 0502 0504 D509 D301 D304 D309 D401 D402 Symbol amp Description D404 D407 D408 D409 D501 D505 Description Fuse clip IC socket Heat sink Washerfaced nut Union nut oO DE EMPHASIS SWITCH ASSEMBLY GWX 183 FOR S S G TYPES 1 REC PLAY PLAY REC LRch LL ch4 TAPE MONITOR Parts List Note When ordering resistors convert the resistance value into code form and RESISTORS then rewrite the part no as before Part No Symbol amp Description RDY PS Finn J R601 R604 Parts List Part
30. 204 R209 R229 R301 R314 R323 R346 R348 R403 R407 R501 R538 R205 R208 R150 R155 R319 R322 R164 R136 R351 R354 Wire wound 0 22 2W R401 R410 R315 R318 R347 R402 R408 R409 R541 Carbon composition 2 2M W SEMICONDUCTORS Part No 25 461 or C PA3001 A PA1001 A 28A726S G F 2SA750 E or F HA1197 25 1919 or F 2SC1400 E 2SA725P F or G 2SA798 F or G 25 1438 or B 250712 or D 28D313 D or E 25 1384 or R 2SA733 Q or R 25 945 2SK117 GR or Y 152076 152473 151555 152473 151555 152473 2 1 261 2 130 WZ 130 10E2 51 01 02 SR3AM 8 30D4 MZ 140 2 140 152472 151554 Symbol amp Description 04 Q5 Q6 Q7 Q8 Q9 Q201 Q202 Q205 Q206 Q505 Q506 Q203 Q204 Q301 Q302 Q303 Q304 Q401 Q402 Q501 Q502 Q503 Q504 D101 D102 D103 D307 D308 D403 D305 D306 D502 D504 D509 D301 D304 D309 D401 D402 D404 D407 D408 D409 Part No Symbol amp Description MZ 220 D501 WZ 220 MZ 061 D505 WZ 061 OTHERS Part No Symbol amp Description AKR 013 Fuse clip AKH 014 IC socket ANH 203 Heat sink ABN 024 Washerfaced nut ABN 047 Union nut FUSE HOLDER ASSEMBLY GWX 187 FOR KC TYPE Parts List of Fuse Holder Assembly GWX 187 Part No Description AKR 013 Fuse clip sx 680 S S G MODEL SX 680 S S G SCHEMATIC DIAGRAM FOR S S G TYPES T
31. B with 100 modulation 75kHz deviation for 400Hz This modulation setting should be used for all the following adjustments 6 Adjust TC to give the maximum reading on the multitester with DC 5004 A range 7 Adjust the primary lower core of T so that the AM FM meter the FM tuning meter indicator needle reads dead center 8 Set the FM SG output to 15dB 9 Adjust TC and TC to give the maximum reading on the multitester 14 10 Set the SX 680 dial pointer 90MHz 11 Set the FM SG output to 90MHz at 106dB 12 Adjust VC for maximum reading on the multitester 13 Set the FM SG output to 15dB 14 Adjust VC and VC so that the multitester reading reaches a maximum 15 Repeat the adjustments of VC and VC when the dial pointer is at 90MHz and of TC TC and TC when the dial pointer is at 106MHz alternately until adjustment at the one frequency requires no further re adjust ment at the other frequency 16 Adjust the core of T to give the maximum reading on the multitester 17 De tune the SX 680 to a position at which only inter station noise is heard and adjust the primary lower core of T so that the AM FM meter indicator needle reads at dead center 18 Set the FM SG output to 98MHz at 66dB 19 Tune the SX 680 to a dial reading of 98MHz observe that the AM FM meter is reading cor rectly at the center of the meter scale 20 Adjust the secondary upper core of
32. BA 003 Screw 3x5 ABA 084 Terminal ANTENNA 49 Screw 3x8 AKA 003 ABA 057 Washer ABE 005 Screw 3x10 ABA 082 Terminal GND AKE 031 O01uF 125V De em SD REI emphasis switch assembly CROCS GWX 180 Insulator cover AEC 279 C Ceramic J Tape assembly GWX 186 Terminal TAPE 1 AKB 035 Terminal INPUT 7 AKB 035 33 ADDITIONAL WY PIONEER Service AM FM STEREO RECEIVER X 590 X 580 KU PIONEER ELECTRONIC CORPORATION 41 Meguro 1 Chome Meguro ku Tokyo 153 Japan U S PIONEER ELECTRONICS CORPORATION 85 Oxford Drive Moonachie New Jersey 07074 U S A PIONEER ELECTRONIC EUROPE N V Luithagen Haven 9 2030 Antwerp Belgium PIONEER ELECTRONICS AUSTRALIA 178 184 Boundary Road Braeside Victoria 3195 Austrata 1 lt ART 307 0 gt OMAY 1978 Printed in Japan lt 78E 01Y6H01 gt MODEL SX 690 KU Although the basic features of models SX 680 KU and SX 690 KU are the same there are a few minor changes in design Please refer to the SX 680 KU service manual with exception of this supplement CONTRAST OF MISCELLANEOUS PARTS Part N SX 680 KU SX 690 KU Front panel assembly ANB 596 ANB 625 Dial panel AAG 158 N AAG 172 Packing case AHD 551 AHD 578 Operating instructions ARB 268 ARB 291 m An LP UP P P IPIE A n P
33. CDXL O80F 50 CEA 220P 16 CKDYB 102K 50 CKDYB 122K 50 CQMA 683K 50 ACG 009 CEA 221P 63 CEA 221P 35 CEA 221P 50 CEA 101P 25 ACH 082 COSH 331J 50 COMA 333K 50 CEA 2R2P 50 CCDSL 331K 50 COMA 223J 50 CEANL 4R7P 25 CEA 101P 35 CEA 010P 50 CEA R47P 50 RESISTORS Part No C92 051 ACV 186 ACV 161 ACT 019 SX 680 S 5 6 Symbol amp Description C164 C502 C221 C156 C405 C117 C163 C126 C128 C157 C160 C162 C131 C143 C133 C136 C137 C138 C141 C139 C140 C144 C145 C146 C147 C148 C149 C154 C158 C159 C166 C170 C401 C402 C409 C412 Ceramic 0 047 150V C403 C404 C415 C406 C408 C413 C414 Electrolytic C155 C169 8000 50V C416 C503 C504 C505 C506 C507 C508 C513 C514 C124 C129 C142 C150 C151 Note When ordering resistors convert the resistance value into code form and then rewrite the part no as before Symbol amp Description VR1 Semi fixed 4 7k B VR301 VR302 Variable TREBLE BASS VR501 Variable VOLUME VR502 Variable BALANCE Part No RD PS 000 J RD PS 000 J RDAPS 000 J RD PS 000 J RD PS 000 J RD PS ODO JNL RD2PS 000 J RD VS 000 J RN 4SO DODO ACN 030 RFAPS 000 J RS2P 000 J RS1P 000 J RFAPS O00 J SEMICONDUCTORS Part No 2SC461 B or C PA3001 A PA1001 A 2SA726S G or F 2SA750 E or F HA1197 28C1919 G or F 25 1400 2SA725P F G 2SA798 F or 25 1438 or B 250712 or D 250313
34. F UNLESS OTHERWISE NOTED pF eei roc Aux dm 1 f SIGNAL VOLTAGE AT 30W 30 8 2 OUTPUT DC VOLTAGE NO INPUT SIGNAL WT Tae M lt gt mA DC CURRENT AT NO INPUT SIGNAL V DC VOLTAGE AT SOW OUTPUT This 15 the basic schematic diagram but the actual Circuit may Vary to Improvements in design Ez Se xe em 65 Gi G oO own i wl ce ete 5 f Q 2 E 9 STK 0039 ss 9 Vs UE 8 Y y Qn 2SC1438 x2 TREBLE CONTROL BASS CONTROL 25 47 2 ee 5 T n I d De D NACE qc MEN ET TE s mi mm prem RB RC L8 JRD et Tos so MAU AB RC tp jo reise lb ooo L Ll wey GWX 177 STEREO RED 1 9 0 a m ne dI Msc Qu MONITOR 1 1 Ue ty L me oM 20 I 21 1 2 poc 4 p FM FRONT END GWB 101 AN 6 4 pag oi i ad AC POWER FUSE HOLDER ASSEMBLY GWX 178 DIAL ILLUMINATE DE EMPHASIS PL SWITCH ED 750 3000 ASSEMBLY ANTENNA FM GWX 180 PHONE JACK i t 1 AT ES i ER aus 5 I 2 412 422 n
35. T L215 9 001 Cm tte 6 2SA725P x2 sg Peel ta AGO fas lt 340 QE mo Sm MZ 140 XW SX 680 KC The indicated semiconductors are representative ones only Other alternative semiconductors may be used and are listed in the parts list FUSE HOLDER Ass y Gwx 187 p 4 r 2 z EE HE Dus v SRSAM 8 x4 ue 0047 PHONES JACK Ass y Gwx 193 HEADPHONES 821 1 y SP at iw POWER METER L ch POWER METER R ch he Bra Ras ul T Del 22 50 560 22 50 4 95 CE n EE an This is the basic schematic diagram but tne actual Circuit may vary die to improvements in design TAPE RED INDICATOR Ds SOURCE GRN GWX 177 STEREO RED Dans x4 rr 25 1919 x2 Rom opem US RD 18155512 aay Vase VOLUME CONTROL GWX 185 L_TAPE_MONTOR 2 2561438 x2 TREBLE CONTROL 2SKI 7x2 VR w BASS CONTROL 0018 MAIN BOARD Ass y GWM 18 2 2 L SPEAKER 25 53 812 R L SPEAKER B MAIN BOARD ASSEMBLY GWM 118 FOR KC TYPE x 0425 461 Fi Qe 5 Riga 100 SX 680 KC Rus Ba 5 Din 132076 Qs PA3001 x 4 13 v a 10 1V 9 33 50
36. bers refer to Tuning Fork VOL 1 Ex 1 For 0000 Codes General resistors a D s Significant figures Multiplier 10X Resistors with fractional values D a D DORO P Significant figures Decimal point t R 0 0 o Significant figures Decimal point Nominal resistance Significant figure Multiplier Resistance Q three figures 10X value code E 5 1 510 o 5R10 5 62 5622 XA y 5R62 10 100 10RO 22 5 225 22R5 110 110 x10 1100 1k 1 1 1560 156 x10 1561 10k 2 10000 100 x10 1002 33 6k 2 33600 336 x10 3362 112k 3 112000 112 x10 1123 1M 4 1000000 100 0 1004 1 56M 1560000 1565 2 For OOO Codes General resistors D O Significant figures Multiplier 10X Resistors with fractional values Significant figures Decimal point Ex 2 Nominal resistance Significant figure Multiplier Resistance 0 two figures 10X value code 0 5 0b aise OR5 1 5 15 1R5 1 01 010 22 22 220 330 33 331 1k 1000 10 102 5 6k 56 562 5600 68k 68000 68 683 820k 820000 824 1M 1000000 10 pe 2 2M 2200000 22 249 Sx 680 CONTRAST OF MISCELLANEOUS PARTS P C BOARD ASSEMBLIES Part No Part Name S type S G type KU type KC type Main board assembly GWM 117 GWM 118 GWM 119 GWM 119 De emphasis switch assem
37. bly GWX 180 GWX 180 GWX 183 GWX 183 FM front end GWB 101 GWB 103 GWB 103 GWB 103 Tape assembly GWX 186 GWX 186 GWX 188 GWX 188 Fuse holder assembly GWX 178 GWX 187 Terminal assembly GWX 201 GWX 201 TRANSFORMER Part Name KU type KC type S type S G type Power transformer ATT 511 ATT 516 ATT 520 ATT 520 SWITCHES Part Name KU type KC type S type S G type Push switch POWER ASG 508 ASG 503 ASG 507 ASG 507 ASG 503 ASG 501 ASG 501 Plug in selector AKR 031 AKR 031 FUSES Symbol Part Name KU type KC type S type S G type d Fuse 4A primary 110 120V 100 AEK 100 100 100 Fuse 2A primary 220 240 AEK 103 AEK 103 Fuse 1 5A Fuse 1A Fuse 1A Part No KU type S type S G type Ceramic i ACG 001 ACG 001 ACG 001 Ceramic Ceramic Ceramic 003 ACG 014 OTHERS Part No Part Name KU type KC type S type S G type AC power cord ADG 023 ADG 005 ADG 016 ADG 016 AC socket AC OUTLETS AKP 004 AKP 004 AKP 019 AKP 019 Capacitor cover for C1 AEC 294 AEC 365 AEC 099 AEC 099 Capacitor cover for C2 AEC 279 AEC 365 AEC 099 AEC 099 PACKING AND FURNISHED PARTS Part No KU type KC type S type S G type Part Name Packing case AHD 551 AHD 557 AHD 551 AHD 558 Cardboard spacer AHG 095 Operating instructions ARB 280 ARB 280 Fuse 4A Dance ue AEK 100 AEK 100 Fuse 2A
38. embly eee assembly ABA 082 AEC 476 GWX 177 Hybrid IC E Screw 3x6 Tuning drum assembly Screw 3x8 gt STK 0039 AXA 113 ABA 066 POWER meter 2 Spring washer ABA 048 ABE 049 AAW 091 Tuning shaft assembly Pulley assembly 208 J AEG 477 al AM FM Screw 3x10 Screw 3x8 Ale AT ABA 082 P s 5 Q Bel ABA 066 gt C Screw 3x16 ee lt Screw 3x8 i NE lt 210 9 002 T Push switch POWER ASG 503 AE assembly Dial panel ees ds R Insulator cover d z ial pan AEC 294 lt Fuse AAG 158 Pulley assembly 100 Smoother AEC 476 N lt AEC 191 Washer deu ABA OMS ACGOOI Screw 3 6 Dial pointer assembly M45 086 358 Mk ABA 048 AAF 074 i crew 3x 27 Nut M9 002 2 SAP gt Td B71 004 RS as 5 Ground terminal 2 P A I A Screw 3x8 S 3x6 Screw 3x6 ABA 066 crew 3x ABA 048 Pulley assembly ABA 066 ABA 056 Main board assembly GWM 117 AEC 477 Knob SPEAKERS p AAD 154 Knob MODE FM MUTE Screw 3x8 AAD 154 002 Knob MONITOR 1 2 AAD 154 Knob LOUDNESS AAD 154 3 32 2 3 NOTE marked parts cannot be supplied Ferrite bar antenna Antenna holder ATB 505 AXB 012 AC power cord ADG 023 Screw 3x8 ABA 057 Strain relief Terminal SPEAKERS Screw 3x10 AEC 327 AKE 026 ABA 082 Screw 3x10 A
39. employing a single transistor is applied to the base of the mixer transistor IF Amplifier and Detector This stage is made up of one IC one transistor and two dual element ceramic filters The NPN transistor inserted between the filters is employed for IF amplifier impedance matching purposes The IC PA3001 A in the following stage incorporates IF amplifiers quadrature detector meter drive and FM muting circuit etc See the block diagram on page 18 for the internal structure of this IC Multiplex Decoder The sub carrier generator PLL system NFB demodulator automatic pilot canceller and stereo mono automatic switch are also built from an IC PA1001 A With the addition of a few CR elements a multiplex decoder of high S N ratio and low distortion has been achieved Again refer to page 18 for further details of this IC A major feature of the PA1001 A is the automatic pilot canceller This circuit detects the level of the 19kHz pilot signal and automatically adjusts to that level to cancel out the pilot signal completely This has made the designing of the low pass filter in the following stage very much easier and has further extended the frequency response at the high end The output signal from the multiplex decoder is passed on via the de emphasis circuit and AF amplifier which serves as both low pass filter and crosstalk canceller to the FUNCTION switch AM Tuner The AM tuner stage consists of a 2 ganged tu
40. epressing the switch 2 NOTE Set these switches to the released OFF position when you listening to records or a broadcasting RESISTANCE VALUE CODES Code numbers of resistors used in Pioneer equipment are expressed in the following way Code number gt n P RD PS 473 J NL Type of resistor RC Power rating Shape tubuler Resistance code value Tolerance Low noise marking Furthermore in the list of parts found in the Service Manual the resistance code value part of the above code number is expressed as 000 or OOOO Resistors included in the Service Manual list of parts RD PSOOO JNL When ordering resistor components first ascer tain the actual resistance value from the circuit diagram and then convert it into code no form as shown in the following examples For further details on code numbers refer to Tuning Fork VOL 1 Ex 1 For 0000 Codes General resistors oOo D Significant figures Multiplier 10X Resistors with fractional values oO D LU RD i Significant figures Decimal point a UU om Significant figures Decimal point Nominal resistance Significant figure Multiplier Resistance two figures 10 value code 5 1 510 5 62 562 10 100 22 5 225 110 110 1k 1000 100 1 56k 1560 156 10k 10000 33 6k 33600 112k 112000 1M 1000000 1 56M 1560000
41. from its center posi tion you will be able to emphasize the sound in the low frequency range Conversely turning this control lef from the center position will attenuate the sound You can use the TREBLE control to adjust the sound in the high frequency range TAPE MONITOR INDICATOR With either of the TAPE MONITOR switches set to ON the TAPE MONITOR indicator lights up This lamp indicates the receiver is monitoring or playing back the tape on the tape deck connected to the TAPE jacks SOURCE INDICATOR With either of the TAPE MONITOR switches set to OFF the SOURCE indicator lights up This lamp indicates the receiver is playing the program source AM broadcast FM broadcast record on the turntable or another com ponent connected to the AUX jacks Gene De ey nes on l Seana RE RIVA KENN DRE RS E T lt 02 1 104 4 106 108 is 100 nm rj 10kHz sass TheBLe mone a 222 lt gt ON e Man nara Man This switch is a combination of the FM muting switch and the mode select switch When the button is left unde pressed ON position the reproduction is in STEREO mode while the FM muting function acts to suppress unpleasant interstation noise while tuning between FM stations when listening to FM broadcasting When the button is depressed OFF position however reproduc tion is in MONO mode while the FM muting function does not act thus enabling suitable
42. he indicated semiconductors are representative ones only Other alternative semiconductors may be used and are listed in the parts list DE EMPHASIS SWITCH Ass y Pu Pur Pu CONNECTION Ass y GWX 183 DIAL HLLUMINATE LAMP 2 GWX 201 300mA x3 E 2 f FU 4 OV 120v FM FRONT END Ass y GWB 103 tp Va TG Co22P FM 3002 752 UNBALANCE oND Q 35K59 Res vs a ae Ls V3 Ts Ad 4 256461 a 256535 tay Reet MAIN BOARD Ass y GWM 119 Ua 152472 250712 wey SWITCHES Si FUNCTION 1 2 FM 3 PHONO 4 AUX 2 TAPE MONITOR OFF ON Sy TAPE MONITOR 2 OEE ON Sa FM MUTE MODE STERE9 JFF MONO LOUDNESS 26 08 SPEAKER or UN SPEAKER B OFF N DE EMPHASIS Tus us 2545 1 POWER OFF ON TUNING SIGNAL METER 3 4 HAMO 2047 PHONES JACK 1 GWx 199 HEADPHONES x DOWER METER L ch POWER METER R ch EH 2A 2208 240V SWITCHED UNSWITCHED 50w 100W t SPEAKER R L SPEAKER B _ at Rs LINE VOLTAGE SELECTOR rus uk 10v 120v 220V 240V E I 3 s05 sor OK Dan so RESISTORS 3 t 1815550 IN OHM 1 4W 25 TOLERANCE UNLESS OTHERWISE NOTED M MQ 2501919 2 5
43. i 25 17 2 Rak Cn P ek i Hk 4 3 E 0018 Wt c 4100 b AD d UE Parts List of Main Board Assembly GWM 117 COILS AND FILTERS Part No ATF 013 ATF 034 ATF 038 ATE 040 ATB 013 ATH 016 ATH 022 SWITCHES Part No ASE 107 ASG 140 ASG 138 ASG 139 CAPACITORS Part No CCDSL 221K 50 CEANL 2R2P 50 CEANL R47M 50 CEANL 470P 25 CCDSL 100F 50 CEA 101P 10 CKDYA 302J 50 COMA 302J 50 CCDSL 101K 50 CKDYA 103J 50 COMA 103J 50 CEA 4R7P 35 CKD YF 4732 50 CKDYF 4732 50 CCDSL 560K 50 CCDSL 470K 50 CEA 220P 6 CEA 470P 35 CCDSL 150K 50 CCDSL 471K 50 COMA 183J 50 COMA 472J 50 104J 50 273 50 CEANL 100P 16 CEA 3R3P 50 CEA 470P 16 CEA 470P 50 Symbol amp Description Fl F2 FM ceramic filter F3 AM ceramic filter F4 455 kHz BPF T2 FM DET T3 AM osc coil L301 L302 AF choke coil 2 2uH L7 Micro inductor Symbol amp Description S1 Slide rotary FUCTION 2 3 Dual push TAPE MONITOR 1 2 4 5 Push MODE FM MUTE LOUDNESS 56 57 Dual push SPEAKERS Symbol amp Description C201 C202 C203 C204 C211 C212 C511 C512 C301 C302 C205 C206 C207 C208 C509 C510 C515 C516 C209 C210 C313 C314 C213 C214 C215 C216 C120 C152 C153 C217 C218 C219 C122 C132 C165 C220 C319 C320 C118 C119 C121 C123 C130 C168 C303 C304 C305 C308 C309 C310 C311 C312 C315 C316 C317 C318 C321 C322 C323
44. ling excluding the push buttons Remove the two screws B from the top edge of the front panel Remove the two nuts from the control shafts Front panel Wooden cover Bottom plate SX 680 10 6 PARTS LOCATIONS Front Panel View Knob TUNING AAA 050 Wooden cover assembly AMM 071 Front panel assembly ANB 596 Knob LOUDNESS Knob POWER S 155 Knob VOLUME Knob SPEAKERS AAB 175 AAD 154 Knob BALANCE AAB 176 Knob BASS TREBLE AAB 175 Knob TAPE MONITOR AAD 154 Knob MODE FM MUTE AAD 154 Knob FUNCTION AAB 175 Front View with Panel Removed LED SOURCE green LED TAPE MONITOR red AEL 308 AEL 307 LED STEREO red POWER meter AEL 307 AAW 091 AM FM meter AAW 089 Tuning shaft assembly AAG 158 AXA 208 Push switch LOUDNESS ASG 138 Dial pointer assembly AAF 074 Push switch POWER qa YE ASG 503 Phone jack PHONES AKN 009 Variable resistor VOLUME ACV 161 Variable resistor BALANCE ACT 019 Dual push switch SPEAKERS ASG 139 Variable resistor Slide rotary switch Dual push switch BASS TREBLE Push switch FUNCTION TAPE MONITOR ACV 186 MODE FM MUTE ASE 107 ASG 140 ASG 138 11 Top View Lamp wedge type 8V 0 3A AEL 029 Lamp socket AKK 005 Main board assembly GWM 117 Fuse holder assembly GWX 178 asc Tuning drum assembly
45. mplifier stage serves as a muting cir cuit which eliminates unwanted switching noises when the power supply is turned on and off and when the FUNCTION selector is used The cir cuitry involved and the voltage changes at different points are shown in Figs 1 2 e When the power supply is turned on Since B is applied to the base of Q very quickly this transistor will remain off when the power supply is first turned on And since the B level is established more rapidly than the B level the potential at point A will initially be lowered to the B level thereby keeping the FET switched off and preventing the application of any signal to the input of the power amplifier stage i e the signals are muted during this period As the B level is gradually established the potential of point A will also increase in response resulting in the FET being turned on some 6 seconds later to terminate the muted condition e When the power supply is turned off The B voltage level diminishes relatively rapid ly and Q is turned on by the forward biasing because B diminishes rather slowly Conse quently the potential at point is reduced to B and the FET is turned off This muting status is achieved within 0 1 second after the power supply is turned off e When FUNCTION selector is operated When the FUNCTION selector switch is at any of the selector positions Q will remain off due to B being applied to its base via
46. n Rule on Power Output Claims for Amplifiers NOTE Specifications and design subject to possible modification without notice due to improvements SX 680 2 FRONT PANEL FACILITIES POWER METERS These meters allow you to read out the rated power leve 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 ohm dummy load instead of the speakers POWER SWITCH Depress this button in the ON position to supply power to the 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 PHONES JACK Plug the headphones into this jack when you want to listen through your stereo headphones Release both SPEAKERS buttons if you want to listen to the sound through your headphones only This means that both buttons will be released SPEAKERS SWITCHES Depress the button corresponding to the speakers con nected to the SPEAKERS terminals A or B on the rear panel You can depress both of these buttons to listen to sound from two pairs of speaker systems at the same time BASS AND TREBLE CONTROLS Use these controls to adjust the bass and the treble If you tun the BASS control to the right
47. ning capacitor an IC HA1197 and a ceramic filter See page 18 for details of the internal structure of HA1197 which contains a 1 stage RF amplifier converter 2 stage IF amplifier detector and AGC circuit 4 2 AUDIO SECTION Equalizer Amplifier The phono equalizer amplifier is an emitter to emitter feedback type 3 stage direct coupled ampli fier designed with a gain of 35 5dB 1kHz phono overload level of 200mV 1kHz THD 0 1 and equalizer deviation of 0 3dB 30Hz 15kHz Buffer Amplifier This is a single transistor amplifier with a gain of approx 12dB Power Amplifier The power amplifier which includes a hybrid IC STK 0039 in the power stage is a first stage differential amplifier all stage direct coupled OCL circuit This IC features an inverted Darlington connection quasi complementary circuit power stage integrated with the bias circuit The output power obtainable with an 8 ohm load is 30 watts 20 20 000Hz THD 0 1 The tone controls BASS TREBLE are operat ed by changing the frequency response of the power amplifier NFB circuit Output Meter Drive Circuit Fundamentally this circuit is the same as those employed in the SA 7700 and the SA 6700 A wide meter range is obtained by compressing the dynamic range of the output signal by taking advantage of the initial portion of the diode VF IF relation Audio Muting Circuit The FET gate circuit connected to the input of the power a
48. o that the string is tensioned after passing it twice around the tuning drum Set the tuning capacitor to its maximum capa city with the vanes fully meshed Attach the dial pointer to the string at the start point at the extreme left hand dial scale and secure it firmly to the string Check that when the tuning shaft is turned the dial pointer tuning capacitor etc all move smoothly Paint lock the knots on the string and cut off the excess after painting Start point 8 ADJUSTMENTS 8 1 FM TUNER The tuning coil in the FM front end does not have an adjusting core Consequently tracking adjust ments at 90MHz are performed by regulating the gap between rotor and stator of the tuning capaci tors VC The expression adjust VC found in the text means that the two outer rotor blades of each of these tuning capaci tors are to be extended outwards with spatula Part No GGK 066 as shown in Fig 5 c Q AX Sg Spatul KED 9 patula 3 0 1 7 Rotor blade EXTEND Tuning F Spatula GGK 066 Stator Rotor blade Fig 5 Adjustment of Tuning Capacitor Connect up the test instruments as shown in Fig 7 Set the FUNCTION switch to FM Turn the MODE FM MUTE switch to OFF Set the dial pointer of the SX 680 to 106MHz Set the FM Signal Generator FM SG output to 106MHz at 106d
49. y be used and are listed in the parts list 9 2 SCHEMATIC DIAGRAM DE EMPHASIS SWITCH An y PL GWX 180 DIAL ILLUMINATE LAMP 300mAX3 FUSE HOLDER Ass y MAIN BOARD Assy me M 2 i 2501384 E 25013 H 4 Que Sew Re su ed 4 19 xi MAIN BOARD Ass y GWM 117 V2 The gt E own m 152472 am 250712 gay 0425 461 n cj 100W AC 120V Fn Don Bona EMI BALANCE MZ 140 AV emi ama 159 UNBALANCE GND gt any ue 2 9 B E SPEAKER A R 1 t Sad OR cc PHONES JACK SPEAKER B zu Pul xe co 9m 0s HEADPHONES snos R oA yj uvea SP at IW s s POWER METER Ru Rann 2 Leh 3 DUAE T ge ow REEL Sti FUNCTION cae S 4 1 AM PASE d ON mui 1 2 Vues quang PHONO 0007 Se SPEAKER rd M uM E NR DESIRE 2 TAPE MONITOR 1 a TE TAE ON Ad OFF ON 2 csse Spt DE EMPHASIS 3 TAPE MONITOR 2 E 25 253 i OFF ON dee TUNING SIGMAL Vin mE i Sy POWER j 54 FM MUTE MODE OFF ON ON STEREO OFF MONO RESISTORS BY 25019192 IN OHM 1 4W 25 TOLERANCE UNLESS OTHERWISE NOTED K kQ M MQ a e 51 TOLERANCE o DEDE IN
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