GrundigSonoclock52SC5302 维修电路图、原理图.pdf

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1、Sonoclock 52 SC 5302 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 be va

2、lid 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-S43

3、0303 S Service Manual Sicherheit Safety Materialnr./Part No. 720108000000 ? Sonoclock 52 SC 5302? Sonoclock 52 SC 5302? Sonoclock 52 SC 5302? Sonoclock 52 SC 5302? Sonoclock 52 SC 5302? Sonoclock 52 SC 5302? Sonoclock 52 SC 5302? Sonoclock 52 SC 5302? EQUIPMENT REQUIRED Signal Source 1. FM signal ge

4、nerator (FM SG) 2. Sweep generator (10.7 Mhz for FM) Output Indicator 1. SSVM 2. Oscilloscope 3. Frequency Counter General preparation 1. Check source voltage. 2. Set function switch to band being aligned 3. Turn volume control to minimum (unless noted otherwise) 4. Connect low side of signal and ou

5、tput indicator to chassis ground unless otherwise specified. Keep ground connection close to high side connection. 5. Keep signal inout as low as possible to avoid and AFC action (set output indicator to high sensitivity.) 6. Standard modulation is 1000 Hz AT 22.5KHZ amplitude for FM FM ALIGNMENT PR

6、OCEDURE Step Signal source (FM RF Gen.) Connect to Set signal to Alignment Indicator connect to Oscilloscope or SSVM Set Radio dial to AdjustAdjust forRemarks 1T1Maximum Symmetrical response 2det. Coil Symmetrical response centered 10.7Mhz 3Repeat Step 1 and 2 as necessary to obtain S curve linearit

7、y , with maximum output FM RF ALIGNMENT Step Signal source (FM Signal Gen.) Connect to Set signal to Alignment indicator (oscilloscope , VTVM Connect to Set radio dial to AdjustAdjust for Remarks 1 87.35 MHz modulated 87.35MHz (lowest end) L7 (Osc, coil) 2 108.25MHz modulated 108.25MHz (Highest end)

8、 C2 (Osc, trimmer) 3 90 MHz modulated 90MHz L3 (RF coil) stretch or squeeze 4 106 MHz modulated 106MHzC1 (RF trim) 5repeat steps 3 and 4 as necessary to minimum tracking error. Also repeat steps 1 and 2 if necessary. * UK models must not be able to tune below 87.5 MHz. Quiet point ALIGNMENT PROCEDUR

9、E MODEL NO. GRUNDIG SONOCLOCK SC 52 Volume control min- position TP2 and GND Sweep centered 10.7 MHz TP3 Detector Output Terminal TP 1, GND (Test point) through matching network if necessary Across speaker voice coilMaximum Volume control Max- position Sonoclock 52 SC 5302? 1 9 8 12 19 7 24 10 23 38 18 13 14 5 2830 33 25 3 34 26 31 39 40 29 274 371617153611 35 20 21 22 32 2 6