Pioneer-SX424-rec-sm电路图 维修手册.pdf

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1、t. , I Snrri*%*J AM/FM STEREO RECEIYER Sx-424/ nuw, Fvzw NOTE MODEL 5X.424 COMES IN TWO VERSIONS DISTINGUISHED AS FOLLOWS: Round label on rear panel Voltage TVpe KUW FVZW 120V only 5-position selector UL approved (U.S.A.) FTZ approved (West Germany) (72co3MoD, lloNEElil RadioFans.CN 收音机爱 好者资料库 sx-42

2、4 CONTENTS 1. SPECI F ICATIONS . 2. FRONT PANE L FACILITIES 3. CONNECTION DIAGRAM 4. DISASSEMBLY 5. PARTS AND PCB LOCATION TOP VIEW . . BOTTOM VIEW 6. DIAL CORD STRINGING 7. ALIGNMENT PROCEDURE 1 3 5 7 I I I 7.1 FM/AMIFAL|GNMENT. .10 7.2 FM/AMTACKINGALIGNMENT 10 7.3 MpX DECODER AL|GNMENT . . 11 7.4

3、OTHER ALIGNMENT . 11 8. PACKING METHOD AND PART NUMBERS. . 12 9. SCHEMATIC DIAGRAMS, PCB PATTERNS AND PARTS LIST 9.1 UNIT CONNECTION DIAGRAM AND MISCELLANEOUS PARTS 13 9.2 TUNER UN|T (AWE-008) . 19 9.3 AF UN|T (AWK-OI I . 25 RadioFans.CN 收音机爱 好者资料库 siX-424 1. SPECIFICAT|ONS SEMICONDUCTORS FETs 1 Tra

4、nsistors. .30 Diodes .21 AMPLIFIER SECTION Music Power Output (lHF) 50W (4O) 37w (8s,) Continuous Power Output 18W18W (4O) (1kHz each channel driven) t 4Wl14W (8O) Continuous Power Output 13W + 13W (4O) (lkHz both channels driven) t2W + 12W (8Sl) Harmonic Distortion Less than 1% (Continuous power ou

5、tput) lntermodulation Distortion Less than 1 % (Continuous power output) Power Bandwith (lHF) 2OHz to 45kHz (8O, Harmonic distortion less than - 1%l Frequency Response 2OHz to 70kHz, t3dB Speakers 4 to 16Sl Damping Factor 40 (8O, l kHz) lnput Sensitivity/lmpedance PHONO MAG 3mV/50kO M lC 4.5mV/50kO

6、AUX 180mV/100kS, TAPE MON ITOR 180mV/100k,C1 TAPE MON ITOR tDlN) 180mV/100kO Recording Output TAPE REC (Pin Jack) 180mV TAPE REC (DlN connector) 36mV BASS Control -gdB, +9dB/100H2 TREBLE Control -gdB, +6dB ll0kHz Equalization Curve PHONO: R IAA S.T.D. Loudness Contour +9.5d8/100H2, +5.5d8/1OkHz with

7、 Volume Control set at -40d8 position. Hum and Noise (lHF) PHONO: More than 75dB AUX: More than 85dB RadioFans.CN 收音机爱 好者资料库 FM TUNER SECTION Frequency Range 88MHz to 108MHz 87.5MHz to 108MHz IFTZ approved) Usable Sensitivity (lHF) 2.31tV Capture Ratio (lHF) 3.5dB lmage Rejection More than 50dB (98M

8、Hz) lF Rejection More than 80dB (90MHz) Spurious Rejection More than 70dB (98MHz) AM Suppression 45dB Signal-to-Noise Ratio 65dB Harmonic Distortion Mono: less than 0.6% ll00o/o Mod.) Stereo: less than 0.8% (100% Mod.) Tuning lndicator Signal strength type Stereo Separation More than 40dB (1kHz) Sub

9、 Carrier Suppression More than 35dB Noise Filter Switchable to ON-OFF Antenna lnput lmpedance 300O balanced and 75O unbalanced AM TUNER SECTION Frequency Range 525kHz to 1,605kH2 Usable Sensitivity (lHF) 15pV lmage Rejection More than 45dB (1,000kH2) lF Rejection More than 35dB SiEnal-to-Noise Ratio

10、 More than 50dB Antenna Built-in ferrite loopstick antenna MISCELLANEOUS Powerrequirements 12OV 60H2, 22OV 50-60H2 or 110V, 120V, 13OV 22OV and 240V. (switchable) 50-60H2 Power Consumption 90W (Max.) AC Outlets Switched 1, Unswitched 1. Dimensions (overalll 16-31 /32in.1431 mm (width) 5-314 in.l146

11、mm (height) 13-21 132 in.l347 mm (depth) Weight (Without package) 16|b, 8ozl7.5 kg (120 voltage model) 17 lb,6oz17.9 kS (Witfr package) 20 lb, 14ozlg.5 kg (120 voltage model) 21 lb,13ozl9.9 kg Furnished Parts FM T-type Antenna 1 Fuse: 1A 1 0.5A (5 line voltage model only) 2 Pin Plug 2 4Speaker Plug

12、Polishing Cloth 1 Operating lnstructions 1 NOTE: Specif ication and the design subject to possible modification without notice due to improvements o. 4. o 1. ct $ 4. DISASSEMBLY Numbers indicate order of disassembly Remove 4 screws from both sides of wooden case. Pull off all knobs, then remove nuts

13、 and washers from shafts of SPEAKERS, TRE- BLE, and SELECTOR. Remove 2 serews from top of front panel. Remove 8 screws from bottom plate of receiver. e$ p_ *p J/ symmetry by the second- ary core.) p) Disconnect the 0.01trtF capacitor from TPl after the alignment has been completed. q) Connect the ca

14、pacitor (4.7trtF) to terminal 28 after the alignment has been eompleted. . AM SECTION a) Turn the selector switch to AM. b) Connect the output lead of the sweep generator to the AM antenna terminal. c) Connect the vertical input of the oscillo- scope to the TAPE REC jack. d) Set the output level of

15、the sweep generator to 75d8. e) Adjust the IFT cores (T9, T10, T11) as shown in Fig. 1, for maximum gain and symmetrical pattern. 7.2 FM/AM TACKING ALIGNMENT . FM SECTION a) Turn the selector switch to FM MONO. b) Connect the output leads of the FM signal generator to the FM antenna terminals. c) Se

16、t the FM signal generator to modulation 4O0Hz, 30Vo and output level 15dB fre- quency 90MHz; also set the receiver dial at 9OMHz. d) Conneet the VTVM and oscilloscope (in parallel) to the TAPE REC jack. e) Observing the output level on the VTVM, adjust the following cores for maximum reading on the

17、meter. Tg . Oscillatorcircuit T1 . Antennacircuit T2 . RFcircuit f) Set the frequency of the FM signal gene- rator and the receiver dial to 106MHz. g) Adjust as follows: Trimmer capacitor CT3: Oscillator circuit Trimmer capacitor CTl . . Antenna circuit Trimmer capacitor CTz . RF circuit h) Repeat s

18、teps (e) to (g) several times. i) Set the output level of the FM signal generator to maximum signal meter deflec- tion. j) Adjust the primary core of T7 for mini- mum sound distortion. 10 . AM SECTION a) Turn the selector switch to AM. b) Connect the AM signal generator to the AM antenna terminal. c

19、) Set the AM signal generator to modulation AOOHz,30%, output level 30dB, frequency 600kHz. Set the receiver dial at 600kHz. d) Connect the VTVM and oscilloscope (in parallel) to the TAPE REC jack. e) Observing the output level on the VTVM, adjust the following cores for maximum reading. T8 . Oscill

20、atorcircuit Ferrite loopstic antenna: Antenna circuit f) Set the AM signal generator and the re- ceiver dial to 1,400kH2 g) Observing the output level on the VTVM, adjust the following cores for maximum reading. cT5 . cT4 . h) Repeat alignments (e) to (g) several times. i) After these alignments, lo

21、ck the trimmer capacitor with paint. 7.3 MPX DECODER ALIGNMENT a) Modulate the FM signal generator output by FM MPX modulator. b) Turn the selector switch to FM AUTO. c) Connect the FM signal generator to the FM antenna terminals. d) Set the FM MPX modulator to modulation; main lkHz (L+R) 6OVo, pilo

22、t 8 - LOVo. e) Set the output level of the FM signal generator to 60dB. f) Turn the tuning knob to maximum reading on the signal meter. g) Set the modulation of the FM MPX modulator to pilot only. sx-424 h) Connect the oscilloscope to TP2. i) Adjust the transformere (T13, T14, T15) until the output

23、level of the 19kHz be- comes maximum on the scope. j) Set the FM MPX modulator to pilot with L or R signal. k) Connect the dual-trace oscilloscope and VTVM to the TAPE REC jacks. l) Adjust the semi-fixed potentiorneter on the tuner unit until the output level of the L or R signal becomes maximum on

24、the scope. 7.4 OTHER ALIGNMENT o CHECKING THE SCA FILTER a) Connect the FM signal generator to the FM antenna terminals. b) Modulate the FM signal generator con- nected to the audio generator, check that the frequency response shows troughs at around 67 kHz and. 7 ZkHz. o CHECKING THE STEREO INDICAT

25、OR a) Connect the FM signal generator to the FM antenna terminals. b) Turn the selector switch to FM AUTO. c) Modulate the FM signal generator con- nected to the FM MPX modulator, and set the FM MPX modulator pilot on. Ctreck that the stereo indicator lamp goes in. Then set the FM MPX modulator to p

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