Sony-STA7-tun-sm 电路图 维修手册.pdf

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1、k1_ ?SAFETY-RELATED COMPONENT WARNING! COMPONENTS IDENTIFIED BY SHADINGAND 8 MARK ON THE SCHEMATIC DIAGRAMS, EXPLODED VIEWS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY S

2、ONY. Power Requirements:220 V.ac(AEPmodell 240 V ac (UK model) 50/60 Hz Power Consumption:.45W Dimensions:Approx.430(w)x70(h) x 420(d) mm 17(w) x 6 41h) x 165/s(d) inches including projecting parts and controls Weight:Approx.14.1 kg, 31 lb 2oz (net) Approx.17.3 kg, 38 lb 2 oz (with shipping -carton)

3、- - - - . . .- TUNER SECTION Tuning Range: 87.5-108 MHz Harmonic Distortion: IM Distortion: Separation: -Continued on page 2- SERVICE MANUA MONO STEREO NORMALNARROWNORMALNARROW 100 Hz 0.04%0.2%0.08%-0.3% 1kHz0.04%0.2%-0.08% 0.3% 10kHz0.05%0.2% 0.3%0.6% MONO STER 0 NORMAL NARROWNORMALNARROW 0.04% 0.2

4、% 0.08% 0.3% Antenna Terminals: -30012, balanced 7552,unbalanced NORMALNARROW 100Hz50 dB 40dB Intermediate Frequency: .10.7 MHz 1kHz 55 dB45dB Sensitivityat50dB quieting: 2.8V (MONO), new IHF 14.2dBf 10kHz40 dB 30dB 30V (STEREO), new IHF 34.6dBf UsableSensitivity:IHF 1.5V, new IHF 8.8dBf Frequency-R

5、ow 20 Hz-15 kHz0 .02 dB S/NRatio: 80 dB (MONO) 401-1z-125 kHz6.5d B 75dB (STEREO) RadioFans.CN 收音机爱 好者资料库 t sr-Aia7s1 Selectivity: 200 kHz 300kHz 400 kHz 300 kHz (40kHzdev.) NORMAL 20dB 50dB 26 dB NARROW 15dB 70 dB 76 dB Capture Ratio: AM Suppression Ratio: Image Response Ratio: IF Response Ratio* S

6、purious Response Ratio: RF Intermodulation: Sub-carrier Product Ratio: Muting Threshold:. Output Level: Detector Output Level: Dolby Adaptor.Output Level: Specification Label. eST-A7 UK model 0.8dB (NORMAL), 1.8dB (NARROW) 60 dB 90 dB 120dB 120dB 74 dB 70 dB Approx.5 Vto 30 V variable FIXED 750 mV,2

7、kn VARIABLE 1.5V, 470 92 atmax.position 200mV, 470 S2 (1kHz, 100%modulation) 1.5 V, 470 St _ST-A7B UK -model MODEL IDENTIFICATIONS -2- ST-A7AEP model e ST-A7B AEP-model SONY. FMSTEREOTUNER MODEL NO. FREQ.RANGE ST- A7 :FM 87.5-108MHz IF :FM 10.7MHz AC 220VI-50/60Hz 45W SERIAL NO. MADE IN JAPAN SQTY F

8、M STEREO TUNER MODEL NO. ST-A7 FREQ.RANGE FM 87.5-108MHz IF FM 10.7MHz .AC 240VI-50/601-1z 45W SERIAL NO. MADE IN JAPAN SNY FMSTEREO TUNER MODEL NO. ST- A 7 B FREQ.RANGE -:FM 875-108MHz IF :FM 10.7 MHz AC 220VI- 50/6OHz 45W SERIAL NO. MADE IN JAPAN SNY FM STEREO TUNER MODEL NO. ST-A7B FREQ.RANGEFM 8

9、75-108MHz IF. FM I0.7MHz AC 240V j -50/60Hz 45W SERIAL NO. MADE IN JAPAN RadioFans.CN 收音机爱 好者资料库 LOCAL OSC FOES rl:A :OA XIAL INPUn 0 TM9 I TANI NNA) 3007 0 0 BALUN B901 RF AMP OIO MIXER Q 02 F AMP 0103 0104 P CK Dc CONTROL VOLTAGE MUTING 0210-213 LOCKED LAMP DRIVE 0330 . JA,ON MUTING (1325-327 MUTI

10、NG SW 1329 ECL BIAS G723 SECTION 1 BLOCK DIAGRAM C F201 MUTING SW 0331. PHASE COMPARATOFI B702, 0701,702,703,704 (1702 3IF AMP C201 0208 H MUTING SW 0332- DC AMP Q703,704 1 5 COUNTER CONTRO IC707(Y) 0 RT202 1J6JJ MUTING SW- G333 LPF L701, C710-712 LPF301 U DIVIDER 13IC708(Y)8 10 0305 ST-A7/A7B MUTIN

11、G 0322 323 H MUTING SW -5334 71II MPX PREAMP 0302 MPPREAMP 0303 0304 NF 1 SENSITIVITY SWITCH 0705,706 7hr MUTING 0720 MUTING 0721 LOCKING DC AMP) 0737-740 0741 SCHMITT TRIGGER CIRCUIT CIRCUIT 4 IC7101Y) 0202 LOCKING (MULTI VIBRATOR) 074E,747 MULTI -9VI8RATORI IC710Mx) VV.III ING)NU LED DRIVE 0336 l

12、O STEREO S301- M00 HI-BL-NOQQ -yMON r O1 8 4 PLL MPX 2 DECODER IC301t v-l DC AMP 5709.7( 0 IF 021 LOCKIN-3 PULSE GENERATOR) G748,749 1 R -SET Pt COUNTER CONTROL 0734-736 SAMPLING PULSE 1/101/10 100 kHz SAMPLING HYSTERSIS 0716-719 (CRYSTAL OSC 6 C702 V ) 1401VIOERII 14 DIVIDER 11-T 3PULSE GENERATORII

13、 IC702 (Y.) KILLER IC703IC704 10 (SWITCHING) (1711 I00 kHzI HYSTERESIS 0712-715 0715 DC AMP (1745 . 1 07161 11/8DIVIDER-11 IC709 COUNTER TIME BASE 11C708 IY) 5 BLANKING D709 II 0727, 728 12 BEAT 0729,730 AMPOC AMP G731 COUNTER CONTROL IC707(V.) AMPBUFFER AMPV . DIVIDER RF AMP 3 RF IC7055072261C706 Q

14、724-726 RadioFans.CN 收音机爱 好者资料库 019609LD03D0 A 5 i ll9909-9803D8 A 91+ - p0L9009-109O A 9,.- 938 8 20918 10 I1dOVW3 Al 9 l0 Pb- NO ddO1o NO:H71IMS 63MOd V (+139v110 44 =Olzo S1Z91ZD/- dWV 3SIO N1 6000 L0931 130 038d 9NINn1 OZE 8109100 awv3V 90Z0 dWV830008 SOZD dWV d333n8 +8ON3,1N000fid 90031 130 D38

15、3 9NINn1 9091) 061831IMS VIdSIO 9oel dIIV70 (8NIH711h1S) 8000 9NI100 MS9N11MW SOLO H311M5 COL OSLO dWV00 50831 831Nn039 119Z I E0B13 iHWOIX ZOCdl 8 009 1090 9NIH311MS AV3dSIO 6000 SAWS V138 LEER MS 5911319 0 A lO6W 1,9 *1I 00071 1933.900301 00330 61C 110 0100 dwv3v ELELIE6000 dwV dV COED dVYV 83dJn8

16、 90ED dWV8933n8 r -7 ZOBl3 IHWLX Z0931 3AI80 1,1300330 NO 000 zoe0 LO831 3AI80 99(1033O r- L J 1010 dWV 30 3Slnd 13538 10831 1081 X ZHW1 OX (9NIHD11MSI ON1100 I(E)NIH3II gzcu MS) 0911nn SOZ00Z0 130 P99 E0031 9319003 9 30033013S38d. 1140 O9L1010 1091NO3 801V83N3O 3Slnd 9090080 09139019 90zo T W LOm 3

17、Slnd 1Nn03 801V31ONI 9NINn1Lj 1060 H 30190 0 EE0 31 D MS 06110 SEE 0 Lozo Idwvd1 VOEO 1 9ze8 dwv H1valnnw 1 OIL 6010 dmv30 0031 8900330 4 Xd6 lid 9 6 ONOrON ON 0 300WlZ-LOES 038315 0ld l8IH M088VN 1VW80N Z-1065 Li4a0FFiki E1 8 00031 I dwv31 991 1000 H311MS IAI11SN3S (IA) 01131 11n3913 983991V1 l 111

18、0830 OZCD ON1100 90L S000 H311M5 AlIA1I1SN3S 9oc0 EDEO d38d Xd ZOCD dWV38ddW 3N EOzo EOZ33 z0503 d30-NO: W6lOfild H311130d3MOd 6091) (t) 9NIlOW 39V110A 1VNDIS DN11nv y 3Slnd13S-8 6016910 19139(0 l19LD (301VU3N3O_ (00109BIA-09C-LELD 3SInd) 111nv) (dwv00) 6000 9NIX301 ONIS3O1ONIA70l 8L1/LEI-1S 8LV/Lb-

19、1S I L -9- pjeoq lojjuoo esegd oljewojnepjeoq XdpI -jeAoo pjeoq lojjuoo asegd 3pewojne eqj anowoy (Noe/q9 x/Iel SMejos UaAes agj anoway pjeoq joyeawq j!nylo p1eOq.Alddns iamod- SCIUVOS 10HINO3 3SVHd a11VWOIf1V. aNV XdUY H3)IV3UG llfl38ioAlddflS U3MOd -jeAoo pjeoq eldslp ep eAoway aNVOG AVIdSIG pjeoq

20、 pue-juojj pieoq JoisIsueij pjeOq iajunoo jaaoo pua-4uOJjjanoo pjeoq jo!suejj *SJOAOOinoj eqj aeoway seaaiosOjOOAOway S(UVOS XdW(3NV HO.SISNVH1ll3iNflOOIIaN3-INOHd UMVd3H aNV )I33H3 SONVO8 Liflamioa 8L/LV-1S leopow ST-A7/A73 SECTION 2 DISASSEMBLY Follow the disassembly procedure in the numerical ord

21、er given. CASE AND BOTTOM PLATE REMOVAL Case Removal: Bottom Plate Removal:00 case case screw bottom plate I BV 3 x 6 (black) PANEL ASSEMBLY REMOVAL -40 U -5- 4 DIAL CORD STRINGING a dial cord, 0.5 mmdia m Tie the dial cord. crimp here Receive a broadcast and set the dial pointer on the dial.scale.

22、1111 -ST-A71A7 0 e dial cord stringing. -Hold the dial cord with left hand. Turn the tuning shaft fully counterclockwise, and install the dial drum as shown above. 11 E . I Put dial cord on the dial drum. 2 cn cc P- OD in Ir .E- ST-A7/A7B MEMO . . . . . . . . . . . . . . . . . . . . . . . . . . . .

23、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

24、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

25、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

26、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

27、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

28、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

29、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

30、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

31、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

32、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

33、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .:1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . : . . . . . . . . . . . . . . . . . .

34、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

35、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

36、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . r. 3-1. IFB

37、OARD ADJUSTMENTS FM BANDWIDTH SELECTION (NORMAL) GAIN ADJUSTMENT 1 ANT FM Signal Generator Setting: Carrier frequency: 98 MHz Modulation: 400 Hz, 75 kHz deviation (100%) Output level: 10 AV (20 dB) 1. Set the SELECTIVITY switch to NARROW. 2. Tune the set to 98 MHz. 3. Memorize a signal meter reading

38、. 4. Set the SELECTIVITY switch to NORMAL. 5. Adjust RT202 for the same signal meter reading as in step 3. Setup: FUNCTION switch: MONO SELECTIVITY switch: NARROW MUTING volume: MIN SET fin oI I: I signal_ O-0 generator oj o ANT 0- 1 1 1 FIXED FM Signal Generator Setting: Carrier frequency:. 98 MHz

39、Modulation: 400 Hz, 75 kHz deviation (100%) Output level: I mV (60 dB) Procedure: 1. Tune the set to 98 MHz. 2. Set the output level of the fm signal generator to 4,uV(12 dB). 3. Adjust RT201 for a 0 V reading on the VTVM. SECTION 3 CIRCUIT ADJUSTMENTS VTVM. Procedure: ; iT_AA,B sougi pioAos sluowjs

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