GrundigSonoclock30SC3340 维修电路图、原理图.pdf

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1、Sonoclock 30 SC 3340 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 30 SC 3340 LW? Sonoclock 30 SC 3340 LW? Sonoclock 30 SC 3340 LW? Sonoclock 30 SC 3340 LW? Sonoclock 30 SC 3340 LW? Signal Source 1. AM signal generator (AM SG) 2. FM signal generator (FM SG) 3. Sweep generator (

4、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 output indicator to chassis ground unl

5、ess otherwise 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 ALIGNM

6、ENT Step Signal source (AM RF Gen) Connect to Set signal to Aligment indicator connect to Oscilloscope or SSVM Set radio dial to AdjustAdjust for Remarks 1A standard radiation loop455 KHzTP3 Detector Output TerminalQuiet pointT2Maximum Volume control min position 2Repeat for maximum output AM RF ALI

7、GNMENT 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) T1 (Osc, coil) 2 1745 KHz (modulated) 1745 KHz (Highest end) C3 (Osc, trim) 3 600 KHz (modulated) 600 KHzL4 (ant coil) 4

8、1440 KHz (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 Adju

9、stAdjust forRemarks 1T2Maximum Symmetrical response 2T4 (det. Coil) 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

10、 , VTVM Connect to Set radio dial to AdjustAdjust for Remarks 1 87 MHz modulated *87MHz (lowest end) L1 (Osc, coil) 2 109 MHz modulated 109MHz (Highest end) C2 (Osc, trimmer) 3 90 MHz modulated 90MHz L2 (RF coil) stretch or squeeze 4 106 MHz modulated 106MHzC1 (RF trim) 5repeat steps 3 and 4 as nece

11、ssary to minimum tracking error. Also repeat steps 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

12、 power supply to the battery snap (inside battery 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

13、a new battery . (Battery Sentinel Indicator will automatically be reset.) 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 TP2 and GND Sweep centered 10.7 MHz TP4 Detector Output TerminalQuiet point Sonoclock 30 SC 3340 LW? Sonoclock 30 SC 3340 LW? 24293013 2234323316282118 1220 6 5 8 7 35 2 14 1 17 27 31 15 26 25 9 4 38 3