Realistic-STA16B-rec-sm 电路图 维修手册.pdf

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1、-aLtstC Serulce STA-168 AM/FM STEREO REGEIVER Catalog Number: 31 -2078 0B RADIo sHACK fln DMSIoN 0F TANDv coRponAloNCUSTOM MANUFACTURED F RadioFans.CN 收音机爱 好者资料库 1) 2l 3) 4 5) 6) 7l 8) e) 10) 11) 121 13) 141 15) 16) ELECTRICAL PE RFORMANCE D ISASSEMB LY I NSTRUCTIONS DIAL STRINGING DIAGRAM BLOCK DIA

2、GRAM ALIGNMENT INSTRUCTIONS .,.,7_ LEVEL DIAGRAM SPECIFICATIONS,3-4 TROUBLESHOOTING AM/FM TUNER, IF all units should be able to approximate these - some will exceed and some may drop slightly below these specs. Limit Specs represent the absolute worst condition which still might be considered accept

3、able; in nocase should a unit perform to less than within any Limit Specs. -4- 2I DISASSEM BLY I NSTR UCTIONS 1) To remove chassis from wood- en cabinet. Turn the cabinet upside down and remove the four Pan head screws from the bottom cabi- net. *-44qrCaia* .W ,i 2) Removal of front panel (Alu- mini

4、um panel). a. Remove the chassis from wooden cabinet as describ- ed in 1). b. Pull out the main chassis. c. Remove the two Pan head screws from the top and the three Pan head screws from the bottom of the front panel. d. Remove knobs and pull off panel. 3) To remove rear panel from chassis. Remove t

5、he three Pan head screws from the rear panel. 3 DIAL STRINGING DIAGRAM P (r) I P I e Start with Capacitor set with Plates Fully Unmeshed. o Pointer position: HIGH END . Start : Spring o Finish: Hook + RNS) t2t / . stretch or squeeze) Adjust for maximum reading on meter o Same as above106 MHz 106 MHz

6、 Tune to Signal AC Voltmeter and Scope to TAPE OUT Jack TC1O1 (FM ANT Trimmer) TCl02 (FM RF Trimmer) Adjust for maximum reading on meter l0 Repeat Steps 8 and 9 until no further improvement is noticed. 11 Same as Step (8) ANT. input: 1 mV 98 MHz98 MHz Tune to Signal 10T1Adjust for maximum reading on

7、 meter 12 Same as Step (8) ANT. input: 100mV 98 MHz98 MHz Tune to Signal VR101Adjust so the Meter Pointer on Receiver is full scale. FM ALIGNMENT SET-UP 3OOO DUMMY FM ANT (l_ u, tort PATTE RN TAPE OUT (L or R) Figure 5 FM SIGNAL GENEBATOR SCOPE PATTEBN Figure 4 Sweep Gen -8- AC V.T-V.M- DISTORTION M

8、ETER FM STEREO ALIGNMENT EOUIPMENT REOUIRED 1. Stereo Modulator. Connect Stereo Modulator to EXT, Mod. terminal 3. Audio Generator FM signal generator. 4. AC Voltmeter Modulation Level of 19kHz Pilot Signal . . 8-1o/o b. Oscilloscope 2. FMSignal Generator.OutputLevel .1mV 6. Distortion Meter Frequen

9、cy . Approximately g8 MHz. 7. Frequency Counter Deviation .75kz l0yo modulation of composite signal. NOTE: o See P.C.B. illustration for alignment/test points. . Set SELECTOR switch to FM and MODE switch to STEREO. MULTIPLEX 8+i: rmrnzotcaot -V .- -*-+ l# c2o3 9o ;F lu o IN =ulol3 -r$ l-t ,/ - R209

10、*?!.t *.ou nvF -.JA/- *l*+i J 1_l 3241 c?3t IF o ilo IB R239 c237 -F -l 4-+ .ri -t5 O= - JF JH il-,-$s+*g:? 85 niee i L2r6_ ht-.-f +o +q rN l *o RZrStH nzrs R234 R233 -aAAr- , - aO-iAnr- -4 ,- Ii$ -Bl aNO ,Sl -DO la c2t4 try l i lF + rDal c?o5 rff +:+ +* l3,q_ Ts .,o+-. +8 cl?s -fi-* -$u -#+ B.g- ig

11、o J til trff -tS l= laqa I t fH r8 *)8 ? ) lo c2o4- +aztz 1l czoz a R202 -+ = R234 orar -4AAr- - : $i:e .$*is:,1+o -./1 - -arW- T tt! iii nii6 aziz- I S cz2t .N -U/- ZN JL f ro R23o lo czl.z *ra ll- -t ln TE *fl !J lo 1N +*/$ 1. n rTu 1 , .2, ,+H NNN o(, V 1OI MAIN AMP TOP VIEW P.C.B. (TOP E:+ .+5 6

12、Td * 9V l; ffiiEr LctTe -OOOla -!-l-. 37i f: I 7*t TR20t iR2o3 2SCgOO tE,U) 2SC62a ISrT) o, 2SC644 lR,S, or 2SC923 (E,U ) l iI !*i I lc2 G_rc R223 r5k Re25 r50K L602 | +,:-l I lq-./ aMANI i l Tr I ;1 iii sEl c2a6 o,ol -#F- -I I ol e- ollo Nr! o I ;19olo t _ nF7 2s o.E, Tito 0 atcg!, tD.E, MAIN AMP B

13、OARD AM./FM RF, IF 8 MPX BOARD _l _rq._,8131, f 9Jo P)e cf60 Rt?4 o.2z tK l.*i tELr, j :ii i:Lo + dt ; -. 1 9 ! a r l d-L ?t :l RiGTH METER -t ; HEADPHONE JACK EEE a* Lch A POINTER LAMP IL,E.D.) Rch 4C602 EO.O2 SPEAKERS Lch 33X :; i df NI I i.lI POWER BOARD 06) IAM,2Fll ,3 PHmO,4AUX. ; rSTEREO,2ilON

14、O. j 1 a , 2 a+4. eE tNDlcATEo tfl oHM-(K=tooHM, M=to6oHr). aR HolcarEo tN /F (P = to /F ). , UilIT TO UNIT FOR OPTITUM-PERFORMANCE. JflOER TWO CONOITIOIS : WITH TO INPUT AND AI 5 WAITS AFEflTHESIS ). ?4LTALMOOELS , DIFFERENT VALUE 15 USEO. A, 250tr: r.6A,2501/ 27- 18 EXPLODED VIEW -28- M , / -29- i

15、 l l I l ) * . i ! t1 l j ,l I ! I ,j : ) l l : l 1 I ll t: lr ii I I 1 l : i I I 1 I i I Ij I I l I 1 I i I -/ i I I I I i Japan l l UK RADro SHAct( EI DtvtstoN oF rANDy coRpoRAnoN U.S.A.: FORT WORTH, TEXAS 76102 CANADA: BARRIE, ONTARIO L4M 4W5 AUSTRALIA TANDY CORPORATION BELGIUM 280 3r6 VtCT0RtA R0A0 RYDALMERE, N SW 2II6 PARC INDUSTBIEL tE NANINNE 5140 NANINNE BILSION ROAI), WEDNESBURY WEST MIDLANDS WSlt) 7JN 1A8 Printed in