GrundigSonoclock720 维修电路图、原理图.pdf

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1、nderungen vorbehalten Subject to alteration 72011 049 5600 (0998) Es gelten die Vorschriften und Sicherheitshinweise gem dem Service Manual Sicherheit“, Sachnr.The regulations and safety instructions shall be valid as provided by the Safety“ Service 72010 800 0000, sowie zustzlich die eventuell abwe

2、ichenden, landesspezifischen Vorschriften!Manual, part number 72010 800 0000, as well as the respective national deviations.S Sonoclock 720 nderungen vorbehalten Subject to alteration 72011 049 5600 (0998) Es gelten die Vorschriften und Sicherheitshinweise gem dem Service Manual Sicherheit“, Sachnr.

3、The regulations and safety instructions shall be valid as provided by the Safety“ Service 72010 800 0000, sowie zustzlich die eventuell abweichenden, landesspezifischen Vorschriften!Manual, part number 72010 800 0000, as well as the respective national deviations.S Sonoclock 720 FREQUENCY COMPENSATI

4、ON GAIN SETTING INPUT GROUND RIPPLE REJECTION BOOTSTRAP TBA820M SUPPLY VOLTAGE OUTPUT 1 2 3 4 8 7 6 5 Q6 Q7 Q12Q16 Q17 Q18 Q1 Q2Q5 Q3Q4Q9 Q8 Q10 Q11 Q13 Q14 R6 2K D3D4 D1 D2 R5 6K R2 5-9K R3 6K R4 2K R1 2K 3 8214 5 6 7 Q15 FM/AM SW AM RF IN TA8164P FM RF OUT FM RF IN GND1FM MIXAM MIXAGCVccAM IF IN F

5、M IF IN AM/ FM SW FM OSC AM OSC DET OUT QUADGND2 FM OSC AM OSC AM DET AM MIX AGC 1345 1514131210 AM IF FM IF FM MIX FM MIX 16119 6278 FM DET nderungen vorbehalten Subject to alteration 72011 049 5600 (0998) Es gelten die Vorschriften und Sicherheitshinweise gem dem Service Manual Sicherheit“, Sachnr

6、.The regulations and safety instructions shall be valid as provided by the Safety“ Service 72010 800 0000, sowie zustzlich die eventuell abweichenden, landesspezifischen Vorschriften!Manual, part number 72010 800 0000, as well as the respective national deviations.S Sonoclock 720 nderungen vorbehalt

7、en Subject to alteration 72011 049 5600 (0998) Es gelten die Vorschriften und Sicherheitshinweise gem dem Service Manual Sicherheit“, Sachnr.The regulations and safety instructions shall be valid as provided by the Safety“ Service 72010 800 0000, sowie zustzlich die eventuell abweichenden, landesspe

8、zifischen Vorschriften!Manual, part number 72010 800 0000, as well as the respective national deviations.S Sonoclock 720 nderungen vorbehalten Subject to alteration 72011 049 5600 (0998) Es gelten die Vorschriften und Sicherheitshinweise gem dem Service Manual Sicherheit“, Sachnr.The regulations and

9、 safety instructions shall be valid as provided by the Safety“ Service 72010 800 0000, sowie zustzlich die eventuell abweichenden, landesspezifischen Vorschriften!Manual, part number 72010 800 0000, as well as the respective national deviations.S Sonoclock 720 ALIGNMENT PROCEDURE MODEL NO:GRUNDIG SO

10、NOCLOCK - SC720 Instruments requiredGeneral preparation 1. Signal Generator.1. Check source voltage, AC according to specifications. 2. FM Signal Generator2. Set function switch to band being aligned. 3. Sweep Generator (10.7 MHz for FM).3. Signal input should be kept as low as possible to avoid AGC

11、 and AFC function 4. VTVM.4. Standard modulation:AM 1 KHz 30% Mod. 5. Oscilloscope .FM 1 KHz 22.5 KHz dev. 6. FM IF Signal Generator. AM IF ALIGNMENT StepSignal source (AM RF Gen.)Set signal Alignment indicator(oscilloscope, VTVM)Set radio Connect totoConnect todial toAdjustAdjust forRemarks 1A stan

12、dard radiation468KHzDetector output termial and QuietT4MaximumVolume control at loopgroundpointmin.position 2Repeat step 1 for max. output. FM ALIGNMENT AlignmentEquipmentConnectionStepGen, FreqDial SellingAdjustmentForAlignment IndicatorAdjustAdjustRemarks Connect to for TP3110.7MHzMinimum(FM , IF)

13、SymmetricalFrequency counter Frequency T3S-curve on IFIF sweep Oscilloscope generator oscillo-TP5210.7MHzMinimum(FM , DET)Symmetrical scopeFrequency T2S-curve on Oscilloscope nderungen vorbehalten Subject to alteration 72011 049 5600 (0998) Es gelten die Vorschriften und Sicherheitshinweise gem dem

14、Service Manual Sicherheit“, Sachnr.The regulations and safety instructions shall be valid as provided by the Safety“ Service 72010 800 0000, sowie zustzlich die eventuell abweichenden, landesspezifischen Vorschriften!Manual, part number 72010 800 0000, as well as the respective national deviations.S

15、 Sonoclock 720 ALIGNMENT PROCEDURE MODEL NO:GRUNDIG SONOCLOCK - SC720 FM RF ALIGNMENT StepSignal source (FM Signal Gen.)Set signal Alignment indicator(oscilloscope, VTVM)Set radio Connect totoConnect todial toAdjustAdjust forRemarks 87.35MHzL2 1modulated(Lowest end)(Osc, coil) 108.25MHzTC2 2TP (1 &

16、2 ) modulatedTerminals(Highest end)(osc,trimmer)Volume through matching networkacross speakerL1 (RF coil)Maximumcontrol at 3if necessary88MHzvoice coil88MHzstretch or max. position modulatedsqueeze 106MHzTC1 4modulated106MHz(RFtrimmer) 5Repeat steps 3 and 4 as necessary to minimize tracking error an

17、d also steps 1 and 2 if necessary. AM RF ALIGNMENT StepSignal source (AM Signal Gen.)Set signal Alignment indicator(oscilloscope, VTVM)Set radio Connect totoConnect todial toAdjustAdjust forRemarks 516KHzT1 1(modulated)(Lowest end)(Osc, coil) 1630KHzTC3 2A standard radiation(modulated)Across speaker(Lowest end)(Osc,trimmer)Volume loop ant.558KHzvoice coilL5Maximumcontrol at 3(modulated) 558KHz (ant coil)max. position 1440KHzTC4 4(modulated)1440KHz(ant trimmer) 5Repeat steps 3 and 4 as necessary to minimize tracking error and also steps 1 and 2 if necessary.