Grundig-Sonoclock-720-Service-Manual电路原理图.pdf
Änderungen vorbehaltenSubject to alteration72011 049 5600 (0998)Es gelten die Vorschriften und Sicherheitshinweise gemäß dem Service Manual Sicherheit“, Sachnr.The regulations and safety instructions shall be valid as provided by the Safety“ Service72010 800 0000, sowie zusätzlich die eventuell abweichenden, landesspezifischen Vorschriften!Manual, part number 72010 800 0000, as well as the respective national deviations.SSonoclock 720Änderungen vorbehaltenSubject to alteration72011 049 5600 (0998)Es gelten die Vorschriften und Sicherheitshinweise gemäß dem Service Manual Sicherheit“, Sachnr.The regulations and safety instructions shall be valid as provided by the Safety“ Service72010 800 0000, sowie zusätzlich die eventuell abweichenden, landesspezifischen Vorschriften!Manual, part number 72010 800 0000, as well as the respective national deviations.SSonoclock 720FREQUENCYCOMPENSATIONGAIN SETTINGINPUTGROUNDRIPPLEREJECTIONBOOTSTRAPTBA820MSUPPLY VOLTAGEOUTPUT12348765Q6Q7Q12 Q16Q17Q18Q1Q2 Q5Q3 Q4 Q9Q8Q10Q11Q13Q14R62KD3 D4D1D2R56KR25-9KR36KR42KR12K3821 4567Q15FM/AMSWAMRF INTA8164PFMRF OUTFMRF INGND1 FM MIX AM MIX AGC Vcc AMIF INFMIF INAM/FM SWFMOSCAMOSCDETOUTQUAD GND2FMOSCAMOSCAMDETAMMIXAGC134515 14 13 12 10AMIFFMIFFMMIXFMMIX16 11 962 78FMDETÄnderungen vorbehaltenSubject to alteration72011 049 5600 (0998)Es gelten die Vorschriften und Sicherheitshinweise gemäß dem Service Manual Sicherheit“, Sachnr.The regulations and safety instructions shall be valid as provided by the Safety“ Service72010 800 0000, sowie zusätzlich die eventuell abweichenden, landesspezifischen Vorschriften!Manual, part number 72010 800 0000, as well as the respective national deviations.SSonoclock 720Änderungen vorbehaltenSubject to alteration72011 049 5600 (0998)Es gelten die Vorschriften und Sicherheitshinweise gemäß dem Service Manual Sicherheit“, Sachnr.The regulations and safety instructions shall be valid as provided by the Safety“ Service72010 800 0000, sowie zusätzlich die eventuell abweichenden, landesspezifischen Vorschriften!Manual, part number 72010 800 0000, as well as the respective national deviations.SSonoclock 720Änderungen vorbehaltenSubject to alteration72011 049 5600 (0998)Es gelten die Vorschriften und Sicherheitshinweise gemäß dem Service Manual Sicherheit“, Sachnr.The regulations and safety instructions shall be valid as provided by the Safety“ Service72010 800 0000, sowie zusätzlich die eventuell abweichenden, landesspezifischen Vorschriften!Manual, part number 72010 800 0000, as well as the respective national deviations.SSonoclock 720ALIGNMENT PROCEDUREMODEL NO:GRUNDIG SONOCLOCK - SC720Instruments required General preparation1. Signal Generator. 1. Check source voltage, AC according to specifications.2. FM Signal Generator 2. 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 and AFC function4. 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 ALIGNMENTStep Signal source (AM RF Gen.) Set signal Alignment indicator(oscilloscope, VTVM) Set radioConnect to to Connect to dial to Adjust Adjust for Remarks1 A standard radiation 468KHz Detector output termial and Quiet T4 Maximum Volume control atloop ground point min.position2 Repeat step 1 for max. output.FM ALIGNMENTAlignment Equipment Connection Step Gen, Freq Dial Selling Adjustment For Alignment Indicator Adjust Adjust RemarksConnect to forTP3 1 10.7MHz Minimum (FM , IF) Symmetrical Frequency counterFrequency T3 S-curve onIF IF sweep Oscilloscopegeneratoroscillo- TP5 2 10.7MHz Minimum (FM , DET) Symmetricalscope Frequency T2 S-curve onOscilloscopeÄnderungen vorbehaltenSubject to alteration72011 049 5600 (0998)Es gelten die Vorschriften und Sicherheitshinweise gemäß dem Service Manual Sicherheit“, Sachnr.The regulations and safety instructions shall be valid as provided by the Safety“ Service72010 800 0000, sowie zusätzlich die eventuell abweichenden, landesspezifischen Vorschriften!Manual, part number 72010 800 0000, as well as the respective national deviations.SSonoclock 720ALIGNMENT PROCEDUREMODEL NO:GRUNDIG SONOCLOCK - SC720FM RF ALIGNMENTStep Signal source (FM Signal Gen.) Set signal Alignment indicator(oscilloscope, VTVM) Set radioConnect to to Connect to dial to Adjust Adjust for Remarks87.35MHz L21 modulated (Lowest end) (Osc, coil)108.25MHz TC22 TP (1 & 2 ) modulated Terminals (Highest end) (osc,trimmer) Volumethrough matching network across speaker L1 (RF coil) Maximum control at3 if necessary 88MHz voice coil 88MHz stretch or max. positionmodulated squeeze106MHz TC14 modulated 106MHz (RFtrimmer)5 Repeat steps 3 and 4 as necessary to minimize tracking error and also steps 1 and 2 if necessary.AM RF ALIGNMENTStep Signal source (AM Signal Gen.) Set signal Alignment indicator(oscilloscope, VTVM) Set radioConnect to to Connect to dial to Adjust Adjust for Remarks516KHz T11 (modulated) (Lowest end) (Osc, coil)1630KHz TC32 A standard radiation (modulated) Across speaker (Lowest end) (Osc,trimmer) Volumeloop ant. 558KHz voice coil L5 Maximum control at3 (modulated) 558KHz (ant coil) max. position1440KHz TC44 (modulated) 1440KHz (ant trimmer)5 Repeat steps 3 and 4 as necessary to minimize tracking error and also steps 1 and 2 if necessary.
