Pioneer-TX520-tun-sm电路图 维修手册.pdf

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1、ffiHf.$W#ffiffi, STEREO TUNER o This service manual is applicable to the KU type. o When repairing the YP,S and S/G types, please see pa 25. o Ce manuel dinstruction se refre au mode de rglage, en franais. o Este manual de servicio trata del mtodo de ajuste escrito en espafrol. 1. 2. 3. 4. 5. 6. 7.

2、8. 9. ELECTRICAL PARTS LIST 10. EXPLODED VIEW 11. PACKING 12. ADJUSTMENTS ncuce AJUSTE ADDITIONAL SE RVICE MANUAL (FOR YP,S AND S/G TYPES) ORDER NO. ART-653-O MODEL TX20 COMES IN FIVE VERSIONS DTSTINGUISHED AS FOLLOWS; TypeVoltage Remarks KUAC1 20V only U.S.A. model YPAC240V only Australia model s/G

3、AC1 10V, 12OV,22OV and 24OY (Switchabte) U.S, Military model sACI 10V.120V, 22OV and24OV (Switchabtel General export model ssAC110V, 12OV,22OV and 240V (Switchablel Soutch Africa model CONTENTS SPECIFICATIONS FRONT PANEL FACILITIES . BLOCK DIAGRAM CIRCUIT DESCRIPTIONS PARTS LOCATION DIAL CORD STRING

4、ING P.C. BOARDS CONNECTION DIAGRAM SCHEMATIC DIAGRAM 2 3 4 4 5 6 7 I 11 13 14 15 18 21 25 PICINEEFI ELEGTFICINIC CCTFIPCIFIATICIN 4-1. Mesuno 1-chome. Mesuno-ku, Tokyo 1s3. Jp6n U.a. FfCINIIE| IIICTF|CINIC3 CCFIFC,F|AIICN 5 Oxf o.d Odve. Moonechre. New Jeey O7O74, U S A PlcrllllFl ILCCTFICINIC (E!,F

5、IC,PE, N.V. Lurchagen-H6ven 9, 2O3O AnEwerp, Elelgrum FfCrTvllF| ILICTF|CINaCa ALTaTFIALIA PTY. LTEI. 17A-1e4 Bound.v Flod. Eln6esrde. VicEonr6 3195. Au6b6li6 =H MAR. 1981 Printed in Japan RadioFans.CN 收音机爱 好者资料库 3. BLOCK DIAGRAM FI tooo AM TUNER FM IF AMP A OETECTOR I 75n GilO ( FT,| MPX STEREO OEI

6、T|oOULAIOR I c ( H Ai l 5 6 w l INOICATORS Ftl +B +-i- V.R. + 8 AM + B -:o I 4. CIRCUIT DESCRIPTIONS FM Tuner The FM front end is comprised of a J-FET (2SK168) single+tate RF amplifier, an NPN transistor mixer, and an NPN transistor modified Clapp local oscillator. The IF stage consists of 2 dualcle

7、ment ceramic filters, a single transistor amplifrer element, and an IF system IC (PA3001-A) which incorporates the IF limiter amplifier, FM detector, and the FM muting circuit. FM Multiplex Stereo Decoder The stereo decoder stage employs an FM MpX IC (HA1156W-P), while the subcarrier signals (freque

8、ncies above l9kHz) are removed by an -18d8/oct. active filter consisting of a pNp transistor. This active filter also sewes as an amplifier for frequencies within its passband, and eliminates crosstalk. FM IF SYSTEM Ic ( P A 3 0 0 r - a ) AM Tuner This employs a 2-ganged tuning capacitor, a dualclem

9、ent ceramic filter, and an IC (HA119T) consisting of a RF amplifier, mixer, 2-stage IF amplifier, detector and AGC circuit. Signal Strength lndicator The TX-520 signal strength meter is a b-point LED display meter driven by the meter drive IC (L81416). The signal meter drive signals from the FM and

10、AM tuner sections are applied to a set of 5 voltage comparators which are activated according to the difference between the applied signal level and the respective reference vottage levels allotted to each comparator, resulting in the LEDs(1-5) being lighted. METER DRIVE IC ( L81416 ) Fig. 4-1 Signa

11、l indicator circuit RadioFans.CN 收音机爱 好者资料库 2. FRONT PANEL FACILITIES o POWER SWITCH When this switch is set to the ON position, power is sup- plied to the tuners main circuits. The units power switch is geared to selecting the transformers secondary and so even at the STANDBY position, the units ci

12、rcuitry will work as long as the power cord is connected to the power outlet. Disconnect the power cord from the power outlet when you do not plan to use the unit for a long period of time ) FUNCTION SWITCH When listening to an FM broadcast - Set the function switch to the OUT ( r ) position. When l

13、istening to an AM broadcast - Set the function switch to the depressed ( ) position. FM MUTING SWITCH When selecting an FM broadcasting station, this switch removes the irritating noise between stations lt should normally be in the ON Position. When the signal is weak and there is a great deal of no

14、ise or distortion with this switch ON, making it difficult to hear, then it should be pressed to put it in the OFF position (in this case mono reproduction is obtained) rurutruc KNoB Turn this to select a broadcasting station (FM or AM) otnu scALE This indicates the frequencY (FM or AMI upper number

15、 (88 - 108) - lower number (55 - 160) - otal PoINTER This moves right or left when the tuning knob is turned. Line it up with the frequency of the station you want to listen to. O stcruel lNDlcAToR This indicates the strength of the signal from the (AM or FM) broadcasting station to which you are pr

16、esently listening. The larger the number of the lamps lit up, the stronger the signal (a strong signal indicates that reception conditions are optimum). G) TUNED INDICATOR This lights up when an FM broadcasting station is being received. This lamp does not light up when an AM broadcast is being rece

17、ived STEREO INDICATOR This lamp lights up automatically when an FM broadcast is in stereo. lt does not light up when the FM MUTING switch is set to OFF. FM T.TYPE ANTENNA This antenna permits FM broadcasts to be heard until a regular FM antenna is installed. NOTE: When the broadcasting station is fa

18、r away or in case of weak signats btocked by mountains, it might not be possible to receive, FM broadcasts with this antenna ln such a case please install an antenna exclusivelY for FM u outdoors of the broadcasting station frequencY of FM station frequency of AM station RadioFans.CN 收音机爱 好者资料库 1. S

19、PEC|FlcATloNs FM Tuner Section Usable Sensitivity . . 108dBf (1.9r.V) 5(HB Quieting SensitivitY MONO .17.3dBf(4.0sV) STEBEO 39.2dBf (50svl Signal-to-Noise Ratio (at 65dBf) MoNo 75d8 STEBEO .70dB Dislortion (at 65dBf) MONO .-.1kHz;0.1o/o STEREO .1kH2;O.2o/o Capture Ratio . ldB Alternate Ghannel Selec

20、tivity (400kHz).60d8 Stereo Separation lkHz. .40d8 Selestivity .25d8 Signal to Noise Ratio . . .50d8 lmage Response Ratio . . .40d8 lFResponseRatio. .70dB Antenna ,. Ferriteloopstickantenna Audio Section Output ( Level/lmpedance) 650mV/3.6kO FM (100% MOD) AM (30% MOD) lSOmV Frequency Besponse . . Sp

21、urious Response Batio .30Hz to t stnz lof oa Miscellaneous PowerRequirements . AC 120V,50/60H2 PowerConsumption .llw Dimensions . 420(W)x 94(H)x254(D)mm 16-9/16(W) x 3-11116(H) x 10(D) in Weight (Without Package) Furnished Parts 3.2k9 (6lb 13oz) FM T-type antenna Operating Instructions NOTE: Specifi

22、cations and the design subiect to possible modifica- tion without notice due to improvements. lmage ResponseRatio .55d8 lF ResponseRatio. .80d8 AM Suppression Ratio . . 55dB MutingThreshold .19.2d8f (5pV) Antenna lnput . . 3(X) ohms balanced, 75 ohms unbalanced AM Tuner Section Sensitivity IHF ferri

23、te antenna 300frV/m lHFexternalantenna. .30pV 3 2 ,r ( ) ( T . t l , T :?1, iil-L+;l iQr4 Qt2 QTQO 09 , HAl 156W.P T4 T2 1C4 VCITCi vRl TC5 VC3 2 rc2 ,:* IKi HJ - -1.r H l-a 9i+d ti R?6 3.46X 1? r ,.:F?ll4l( ) -l - - *3-rrr- Ll t* # *= ffi ffi* ffi ffi f, t, c ,1 . r,|;f: r , Y#lu, T -i- *Rfi,.- , :

24、li :na4pu- 33/50 fJ.,fti Tc ,1lfff ibJi ffi # i _blf,r.;,ld; ff;* # f - | | J*;,J_h;EE ili; sT-ffi,:io i i :t:f-il.;fl,ryF #l , !:, PA3001-A HAl 197 2SA726S 2sc2575 I E 3 2 1 7. P.C.BOARDS CONNECTION DIAGRAM A TUNER Assy(cWt- | SZ) Q4 Q5 02 Q3 External Appearance of Transistors and lCs 2sKt6B 2sc461

25、 2Sc53s E i _,f-* i 0iz aEe j: ffiLJffi -: ll -,.,.$j.ilgji ffiiffi# :,.,*fu ri.,- r;_-t I i I e ,:7- 16i,o0K at2 zsc461 ll , .-_ fir:T . .lffil .jflTE* ffi-g *tq- + L+=j-s- *4*l-.=*=*-#i,lo-.,:.-.,1.rcai*.fi|.-,:*.- 6 DIAL POINTER SWITCH AssY (cws-346) LED Assy (GwX-634) zscxt45A Tl:POWER TRANSFORM

26、ER r - - - - - - R t o o 2 2 M . ( t / 2 w ) LBl4t6 PL2 aV I OOmA P L I A V O 3 A AC | 20V 5 4 5. PARTS LOCATION Front Panel View Front panel assemblY ANM-005 r Rear Panel View Strain relief AEG76O Terminal (ANTEN AKA.O14 Top View Dial pointer assembly AAF-I 11 * * LamP with wires AEL-l55 A * Power

27、transformer ATT-790 A i* Pushswitch (POWER) ASG-s16 * lmp AEL-108 Switch NOTES: CTheAmarhfoundonsomecomponentpartsindicatestheimportanceofthe safetyfactoroftnepartTherefore,whenreplacing,besuretotnepartsofidentical designntion. oForyourPartsstochControl,theftmovingitemsareindicatedwiththe marhs * an

28、d * i7 cawsnALLY MovES FASTER THAN * This clasification snitt-UeTdiueted by each distibutor becarse it depende on model number, temperature, humidity, etc base AEC-741 KNOb (TUNING AAA.O71 Knob (FUNCTION, FM MUTING AAD.268 Terminal (AM STEREO OUTI AKB-O76 Strain reliel AEC-327 AC power cord ADG.Os2

29、ADE.O34 Tuning shaft assembly AXA-292 * * Push switch (FUNCTION, FM MUTING) ASG-261 LED assembly cwx-638 Top GWs346 Dial Pointer 6. DIAL CORD STRINGING 1. Remove the top cover and front panel 2. Remove the tuning drum from the shaft of the tuning caPacitor 3. fie one end ot ite cord to the stud A lo

30、cated inside the tuning drum 4. Rotate tfte tuin-capacitor right,around until - ifr ,otot blades a tutty intermeshed 5. 6; the tunint dnrm back:I,t tTT: Jupuitot shaft, aking sure- that the secunng ti* B faces directlY uPwar-d 6. Pass the cord oi Uttgtt the small opening in the circumtt of lrre tuni

31、ng drum (see diagram), a tftt take it over pulleys C D and E in that sequence z. friiJtrt oa Jtttd the tuningshaft 3 times 8. Pass it over pffV f *ii.d il.t9ld the tuning drum 2 times, iiJ littutty tie it to the spring tt.t C so that it is tensioned 9. Tum the tuning shaft, and check that the cord m

32、oves smoothly. 10. Cut off any excess eord ii. T;-; tuning shaft counterclockwise as far as it will go 12. Alig the dial pit wrth the starting point - ; A dial scaie, and then pass the cord over it. 13. Check that ttre diat pointer is in line with the- - starting point of the dial scale 14. Finally

33、appty ttr locking paint to the cord securing positions (stud A and spring hook G) and the dial Pointer connecuon 9. ELECTRICAL PARTS LIST NOlES; o llhen ord,ering resisfors, first convert resistance ualuec into code form as shown in the following examples. Ex. 1 Wen there are 2 effectiue digits (any

34、 digit apart from O), such 56O ohm and 47h ohm (tolerance is shown by J=5%, and K=lO% ). 56Oa 56 x lol 57ka 47 x 103 561 . . . . RD%PS EtE J 473.,., RD%PS EAAB J - o.sa 0R5 . . . . . RN2H rE6 K rsl 010 . . . srP a K Ex. 2 Wen there are 3 effectiue d,igits (tuch as in high precision metal film resist

35、ots), 5.62ha 562 x 10562r . . . RN%SR 6ln F c The I mark found, on some component parts indicates the importance of the safety factor of the part. Therefore, when replacing, be sure to use parts of i de ntical des i gnati o n. o For your Parts Stoch Control, the fast mouing items are indicated with

36、the marhs * and * . * GENERALLY MOVES FASTER THAN * This classification shall be adjwted by each distibutor because it depends on model number, temperature, humidity, etc. Miscellaneous Parts I Mark Part No,Symbol c32 r-ql sZ-r-3 lSroD | .l I # # - F M vRl I vco AoJ a c P - o 7 9 c55 35 c45 33/ 50 Q

37、6 HArrS6w- P I4PX IC , a c56 D2 470/ ( POWER 654 t/30 L C20 Tooez # c43 o.47 /50 R27 47r cr9 zz,/so NOTE: The indicated, semiconductors are representative oneg only. Other alternatiue semiconductors may be used and are listed in the parts list. L I OUTPUT I R _ Fso-l AT FM roo I Mo0 1- RESISTORS: f

38、ndic.ted in a. %W, !5% tolerarce u16 orhniisnoted k : kQ, M: Mo. (Fl : rl%, (Gl : r2%, (Kl I r1096, (drrll:,2O% toler 2- CAPACITORST Indicated in capacity kF)/voltage (v) uriless otheMise noted p : pF lhdication without voltage is 50V except ellrolytic capacitor, 3. VOLTAGE *l I : DC voltage (V) at

39、no input signal I l-Vl: Signal votrase at FM 4OOHz 75kHz DEV 4- OTHERS: : Adjusting poinl The 2 mark found on rcme codponent pans indicates the im poftance ol the glety tactor of the part. Therefore. when replacrng, be sre to use parts of idenlicai dBignation This is the basic shemalic diagram, bul

40、the aclual crrcuit may vary due to improvemenls in desiqn SWITCHES: SI : POWER ON - STANO-8Y S 2 - I : F U N C T I O N F M - A M S 2 - 2 : F M M U T I N G O N - O F F The unde.lined indicates the switch position - - - I STEREO ) A E L - 3 3 7 A E L -3 3 4 D A s s y G W X - 6 3 8 6 5 4 LEVEL SET ITVE

41、RTER ,i,f :,if,J |:* ! l: Q?,8 asa?z6s I sa- rurcm R40 azr R4r tO* er1, 14 zsce45a 14 I Til- *:* 1l3- .!c lJ- + +;-* 3 E rUNE D -CN ) 1 2 3 4 5 6 7 q 1 3 L B t 4 1 6 SIGNAL INDICAIOR DRIVER 1 4 1 3 1 2 i l t O I A 10. EXPLODED VIEW D I 11. PACKING MarkNo. Part No. 1. 2. 3. 4. AHA-29O ARB4O3 ADH.OO4

42、AHD899 Side pad Operating instructions T-type FMantenna Packing case . - % x , w * Parts List of Exploded View NOTES: c Parts without part number cannot be supplied, c The $, marh found on some component parts indicates the importance of the safety factor of the part. Therefore, when replacing, be s

43、ure to use parts of identical designation. c For your Parts stoch control, the fast mouing items ore indicated with the marks * and * * GENERALLY MOVES FASTER THAN * This classifcation shall be adjusted by each distributor because it depends on model numb e r, te mp e mture, humid ity, e t c. Descri

44、ption Mark No. Part No. No.Pen No. Description Description 1. ANE-291 2. FBT4OPOSOFZK 3. VB230P100FzK 4. AEL-l08 5. cws-346 6. vBz30P080FMC 7- PMZ30P060FMC 8. AAD-264 9. ANM-O05 10. wA92F140U050 11. NKgOFUC 12. AEG741 13. AAA-O71 14. ADG-052 15. AEG327 16. ATT-790 17. ABA-252 18. AEL-l55 19. AAF-I 1

45、1 20. AAD-268 21. PMZ30P40FZB 22. GWX.638 23. AXA-292 24. A8A-246 25. AEC678 Top cover Screw4 X 8 Screw3 X 10 Lamp assembly Switch assembly Screw3 X I Screw3 X 6 Knob (POWER) Front panel assembly Flat rarasher Nut M9 Knob base Knob (TUNING) AC power cord Strain relief Power transf ormer (1 20V) Scre

46、w3 X 8 Lamp with wires Dial pointer assembly Knob (FM MUTING, FUNCTION Screw3 X 4 LED assembly Tuning shaft assembly Screw3 X 12 Nylon rivet 26. 27. 2A. 29. 30. 31. 32. 101. 102. 1 03. 104. 105. 1 06. 107. 1 08. 1 09. 1 10. 111. 112. 1 13. 1 14. 115. 1 16. 117 . ADE-034 AEC-760 AKB.O76 GWE-152 AEC-6

47、09 Output cords Strain relief Terminal (AM STEREO OUT) Tuner assembly Foot assembly Terminal strip 2-P Side frame L Side cover Flexible joint Dial scale board Sub-panel Pulley assembly Smoother Plate Serial number plate Rear panel Guide arm Tuning drum Holder Pulley assembly Side frame R Bottom plat

48、e * A A* * 12.2 AM TUNER SECTION o Connect the AM signal generator (AM SG) to the AM ANTENNA terminal through a 10kA resistor. o Set the FUNCTION switch to the AM position. *Slide the bar-antenna coil along the core. Stap AM SG (4filHz, 3O% modulationl Position of dial pointer Adiustment point Adjus

49、tmnt spocification FrequencyLevel 1400kHz1 00dB 1400kHzTC5 Adiust until demodulated signal at OUTPUT terminal is maximum. z600kHz1 00dB 600kHzT3 3Set the AM SG to 30dB output level, repeat steps I to 2 above. 41400kHz50dB 1 400kHzTA Adjust until demodulated signal at OUTPUT terminal is maxrmum. 5600