GrundigSonoclock50SC5340S 维修电路图、原理图.pdf

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1、Sonoclock 50 SC 5340 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 be

2、 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-S

3、43 0103 S Service Manual Sicherheit Safety Materialnr./Part No. 720108000000 ? Sonoclock 50 SC 5340 LW? Sonoclock 50 SC 5340 LW? Sonoclock 50 SC 5340 LW? Sonoclock 50 SC 5340 LW? EQUIPMENT REQUIRED Signal Source 1. AM signal generator (AM SG) 2. FM signal generator (FM SG) 3. Sweep generator (10.7 M

4、hz 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 output indicator to chassis ground unless ot

5、herwise specified. Keep ground connection close to high side connection. 5. Keep signal inout as low as possible to avoid AGC and AFC action (set output indicator to high sensitivity.) 6. Standard modulation is 1000 Hz AT 30% amplitude for AM (1000 Hz at 22.5 kHz deviation for FM) AM IF ALIGNMENT St

6、ep Signal source (AM RF Gen) Connect to Set signal to Aligment indicator connect to Oscilloscope or SSVM Set radio dial toAdjustAdjust for Remarks 1A standard radiation loop460 KHzTP3 Detector Output TerminalQuiet pointT5Maximum Volume control min position 2Repeat for maximum output AM RF ALIGNMENT

7、Signal source (AM Signal Gen.) connect to Set signal to Alignment indicator Connect toSet radio dial to Adjust Adjust forRemarks 1 515 KHz (modulated) 515 KHz (lowest end) T6 (Osc, coil) 2 1745 KHz (modulated) 1745 KHz (Highest end) C3 (Osc, trim) 3 600 KHz (modulated) 600 KHzL2 (ant coil) 4 1440 KH

8、z (modulated) 1400 KHzC4 (ant trim) 5Repeat Steps 3 and 4 as necessary to minimize tracking error. Also repeat steps 1 and 2 if necessary. FM ALIGNMENT PROCEDURE Step Signal source (FM RF Gen.) Connect to Set signal to Alignment Indicator connect to Oscilloscope or SSVM Set Radio dial to AdjustAdjus

9、t forRemarks 1T7 2 Symmetrical response centered 10.7Mhz 3Repeat Step 1 and 2 as necessary to obtain S curve linearity , 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

10、 for Remarks 1 87 MHz modulated *87MHz (lowest end) L7 (Osc, coil) 2 109 MHz modulated 109MHz (Highest end) C1 (Osc, trimmer) 3 90 MHz modulated 90MHz L8 (RF coil) stretch or squeeze 4 106 MHz modulated 106MHzC2 (RF trim) 5repeat steps 3 and 4 as necessary to minimum tracking error. Also repeat step

11、s 1 and 2 if necessary. * UK models must not be able to tune below 87.5 MHz. BATTERY SENTINEL LEN ADJUSTMENT SETTING OF the 27 pin of IC2 (FOR SWITCH -ON POINT) 1. Plug unit into an AC outlet. 2. Set clock as described in owners manual 3. Connect a DC power supply to the battery snap (inside battery

12、 compartment - no battery connected.) Connect to DC voltmeter across battery snap. 4. Set DC power suply to 8.2 volts. Adjust 27 pin of IC2 to the point where the Battery Sentinel just turns on. Disconnect DC power supply and voltmeter. 5. Connect to a new battery . (Battery Sentinel Indicator will

13、automatically be reset.) ALIGNMENT PROCEDURE MODEL NO. GRUNDIG SONOCLOCK SC 50/50L A standard radiation loop antennaAcross speaker voice coilMaximum Volume control max- position Volume control min- position TP 1, GND (Test point) through matching network if necessary Across speaker voice coilMaximum Volume control Max- position TP1 and GND Sweep centered 10.7 MHz TP3 Detector Output TerminalQuiet point Sonoclock 50 SC 5340 LW? Sonoclock 50 SC 5340 LW?