GrundigMusikBoy50LRP 维修电路图、原理图.pdf

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1、Musik Boy 50L RP 5240 LW Service Document Exchange Set Es gelten die Vorschriften und Sicherheitshinweise gem dem Service Manual Sicherheit, Material- nummer 720108000000, sowie zustzlich die even- tuell abweichenden, landesspezifischen Vorschrif- ten! The regulations and safety instructions shall b

2、e valid as provided by the Safety Service Manual, part number 720108000000, as well as the respective national deviations. S Dieses Service Dokument ist nur in Datenform verfgbar This Service Document is only available as data nderungen vorbehalten/Subject to alteration Made by GRUNDIG in Germany H-

3、S43 0802 S Service Manual Sicherheit Safety Materialnr./Part No. 720108000000 ? Musik Boy 50L RP 5240 LW? NOTE : USING SONY IC CXA1191 WITHOUT FM IFT A L I G N M E N T P R O C E D U R E MODEL NO.: GRUNDIG RP5240LW INSTRUMENTS REQUIREDGENERAL PREPARATION 1. Signal Generator1. Check source voltage, DC

4、 or AC according to specificaions 2. FM Signal Generator2. Set function switch to band being aligned 3. FM/AM IF Sweep Generator (10.7 MHz for FM)3. Signal input should be kept as low as possible to avoid AGC and AFC function 4. VTVM4. Standard modulation : AM 1 KHz 30% mod 5. OscilloscopeFM 1 KHz 2

5、2.5 KHz dev 6. Frequency counter 7. Regulated DC power supply AM IF ALIGNMENT STEP SIGNAL SOURCE (AM RF Gen.) CONNECT TO SET SIGNAL TOALIGNMENT INDICATOR (Oscilloscope, VTVM) CONNECT TO SET RADIO DIAL TO ADJUSTADJUST FORREMARKS TP 4Volume control at 1A standard radiation460KHz Detector output termin

6、alQuietMaximummin. position loop and TP 2 groundPointT 2 2 Repeat step 1 for max. output FM IF ALIGNMENT This model requires no FM IF alignment as the IF is fixed by ceramic filter and discriminator CF 1 & CF 2. Please take note that correct type and same color dot of ceramic filter is used in servi

7、cing, diff color dot of ceramic filter may cause worse IF S curve characteristic and distortion. Connect IF genescope output terminal to TP 3 & TP 2 (GND) in series with a 100 Pf capacitor, connect scope input terminal to TP 4 & TP 2 (GND), then the IF characteristic curve can be observed. Musik Boy

8、 50L RP 5240 LW? A L I G N M E N T P R O C E D U R E MODEL NO.: GRUNDIG RP5240LW SIGNAL SOURCE (FM Signal Gen.) CONNECT TOSET SIGNAL TOALIGNMENT INDICATOR (Oscilloscope, VTVM) CONNECT TO SET RADIO DIAL TO ADJUSTADJUST FORREMARKS L 4 87.35 MHz(Lowest end)stretch or (modulated)squeeze TP 1108.25 MHzTe

9、rminalsVC1 BVolume through matching network(modulated)across speaker (Highest end)(Osc. trimmer)Maximumcontrol at if necessaryvoice coilL 3 (RF coil)max. position 88 MHz88 MHzstretch or (modulated)squeeze 106 MHzVC1 C (modulated)106 MHz (RF trimmer) Repeat steps 3 and 4 as necessary to minimize trac

10、king error and also steps 1 and 2 if necessary ALIGNMENT SIGNAL SOURCE (AM Signal Gen.) CONNECT TOSET SIGNAL TOALIGNMENT INDICATOR (Oscilloscope, VTVM) CONNECT TO SET RADIO DIAL TO ADJUSTADJUST FORREMARKS 515 KHzL 5 (modulated)(Lowest end)(Osc. coil) 1640 KHzVC1 AVolume A standard radiation(modulate

11、d)Across speaker(Highest end)(Osc. trimmer)Maximumcontrol at loop ant.558 KHzvoice coilL 2max. position (modulated)558 KHz(ant. coil) 1440 KHzVC1 D (modulated)1440 KHz(ant. trimmer) Repeat steps 3 and 4 as necessary to minimize tracking error and also steps 1 and 2 if necessary ALIGNMENT SIGNAL SOUR

12、CE (LW Signal Gen.) CONNECT TOSET SIGNAL TOALIGNMENT INDICATOR (Oscilloscope, VTVM) CONNECT TO SET RADIO DIAL TO ADJUSTADJUST FORREMARKS 142 KHZ (modulated)(Lowest end)NA 292 KHzTerminalsTC 3Volume A standard radiation(modulated)across speaker(Highest end)(Osc. trimmer)Maximumcontrol at loop ant.153

13、 KHzvoice coilL 6max. position (modulated)153 KHz(ant. coil) 261 KHzTC 4 (modulated)261 KHz(ant. trimmer) Repeat steps 3 and 4 as necessary to minimize tracking error and also steps 1 and 2 if necessary Musik Boy 50L RP 5240 LW? Musik Boy 50L RP 5240 LW? Musik Boy 50L RP 5240 LW? Musik Boy 50L RP 5240 LW? Musik Boy 50L RP 5240 LW?