Grundig-Sonoclock-50-SC-5340-S-Service-Manual电路原理图.pdf

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1、Sonoclock 50 SC 5340 LWService DocumentExchange SetEs gelten die Vorschriften und Sicherheitshinweisegem dem Service Manual “Sicherheit“, Material-nummer 720108000000, sowie zustzlich die even-tuell abweichenden, landesspezifischen Vorschrif-ten!The regulations and safety instructions shall bevalid

2、as provided by the “Safety“ Service Manual,part number 720108000000, as well as therespective national deviations.SDieses Service Dokument ist nur in Datenform verfgbarThis Service Document is only available as datanderungen vorbehalten/Subject to alterationMade by GRUNDIG in Germany H-S43 0103http:

3、/SServiceManualSicherheitSafetyMaterialnr./Part No.720108000000IK501Sonoclock 50 SC 5340 LWIK501Sonoclock 50 SC 5340 LWIK501Sonoclock 50 SC 5340 LWIK501Sonoclock 50 SC 5340 LWIK501EQUIPMENT REQUIREDSignal Source1. AM signal generator (AM SG)2. FM signal generator (FM SG)3. Sweep generator (10.7 Mhz

4、for FM)Output Indicator1. SSVM2. Oscilloscope3. Frequency CounterGeneral preparation1. Check source voltage.2. Set function switch to band being aligned3. Turn volume control to minimum (unless noted otherwise)4. Connect low side of signal and output indicator to chassis ground unless otherwise spec

5、ified.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 StepSignal source (

6、AM RF Gen) Connect to Set signal toAligment indicator connect to Oscilloscope or SSVMSet radio dial toAdjust Adjust for Remarks1 A standard radiation loop460 KHz TP3 Detector Output TerminalQuiet point T5 MaximumVolume control min position2 Repeat for maximum outputAM RF ALIGNMENT Signal source (AM

7、Signal Gen.) connect to Set signal to Alignment indicator Connect toSet radio dial to Adjust Adjust for Remarks1515 KHz (modulated)515 KHz (lowest end)T6 (Osc, coil)21745 KHz (modulated)1745 KHz (Highest end)C3 (Osc, trim)3600 KHz (modulated)600 KHz L2 (ant coil)41440 KHz (modulated)1400 KHz C4 (ant

8、 trim)5 Repeat Steps 3 and 4 as necessary to minimize tracking error. Also repeat steps 1 and 2 if necessary.FM ALIGNMENT PROCEDUREStepSignal source (FM RF Gen.) ConnecttoSet signal toAlignment Indicator connect to OscilloscopeorSSVMSet Radio dial toAdjust Adjust for Remarks1 T72Symmetrical response

9、 centered 10.7Mhz3 Repeat Step 1 and 2 as necessary to obtain S curve linearity , with maximum outputFM RF ALIGNMENT StepSignal source (FM Signal Gen.) ConnecttoSet signal toAlignment indicator (oscilloscope , VTVMConnecttoSet radio dial to Adjust Adjust for Remarks187 MHz modulated*87MHz (lowestend

10、)L7 (Osc, coil)2109 MHz modulated109MHz (Highestend)C1 (Osc, trimmer)390 MHz modulated90MHzL8 (RF coil) stretch or squeeze4106 MHz modulated106MHz C2 (RF trim)5 repeat 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 be

11、low 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 manual3. Connect a DC power supply to the battery snap (inside battery compartment - no battery connected.)Connect to DC voltmeter across

12、 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 automatically be reset.)ALIGNMENT PROCEDUREMODEL NO. GRUNDIG SONOCLOCK

13、 SC 50/50LA standard radiation loop antenna Across speaker voice coil MaximumVolume control max- positionVolume control min- positionTP 1, GND (Test point) through matching network if necessaryAcross speaker voice coil MaximumVolume control Max- positionTP1 and GNDSweep centered 10.7 MHzTP3 Detector Output TerminalQuiet pointSonoclock 50 SC 5340 LWIK501Sonoclock 50 SC 5340 LWIK501