Denon-TU767-tun-sm维修电路原理图.pdf

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1、DENON HI-Fi Component/Tuner SERVICE MANUAL MODEL TU-767 AM-FM STEREO TUNER TABLE OF CONTENTS SPECIFICATIONS ? 2 CONTROLS AND THEIR DESCRIPTION ? 3 BLOCK DIAGRAM ? 3 CONNECTIONS ? 4-5 METHOD OF ADJUSTMENTS ? 6-8 SEMICONDUCTORS ? 8-10 PRINTED WI RING BOARD PATTERNS AND PARTS LIST ETC0658J TRAP UNIT ?

2、10 ETC0660N DISPLAY UNIT ? 10 ETC0659L TUNER UNIT ? 11 CONNECTION DIAGRAM ? 12 WIRING DIAGRAM ? 13 EXPLODED VIEW OF CHASSIS AND CABINET ? 14 NIPPON COLUMBIA CO., LTD. RadioFans.CN 收音机爱 好者资料库TU-767 SPECI F ICATIONS FM SECTION Frequency Range: Antenna Terminals: Practical Sensitivity: S/N 50 dB Sensit

3、ivity: 87,5 108 MHz 75 ohm unbalanced 0.9 AV (10.3 dBf) Stereo: 15.8 MV (35.2 dBf) Antenna Terminal: Usable Sensitivity: Selectivity: Image Interference Ratio: Singel-to-noise Ratio: With Loop Antenna 18 AV 55 dB 45 dB 55 dB Monaural: 1.5 AV (14.2 dBf) Total Harmonic Distortion: 0.3% 0 dBf at 10-15w

4、 (new IHF Standard) Output Level (at 30% Image Interference Ratio: 90 dB modulation): 0.2 V IF Interference Ratio: 100 dB AM Suppression Ratio: 65 dB LEVEL CHECKING SIGNAL Effective Selectivity: Wide = 50 dB Frequency: 440 Hz Narrow = 60 ?(t300 kHz) Output Level: 0.3 V Capture Ratio: 1.0 dB Electric

5、 Field Strength Frequency Characteristics: +02 20 Hz to 15 kHz ?dB Indication: by 7 LEDs (Green) Signal -to-noise Ratio: Monaural: 88 dB OTHERS Stereo: 82 dB Power Supply: AC 220 V/50 Hz Total Harmonic Distortion Monaural Power Requirement: AC 11 W (at 75 kHz deviation) Dimensions: 434 mm (17.1)W x

6、66 mm (2.6) H x 1 kHz ?0.03% 281 mm (11.1)D Stereo Net Weight: 3.6 kg (7.94 lbs.) (at 67.5 kHz deviation) 1 kHz ?0.04% Stereo Separation: 1 kHz 57 dB Muting Operating Level: 20 dB Output Level (at 75 kHz deviation)t 0.6 V AM SECTION (MW) Frequency Range: 522 1611 kHz Design and specifications subjec

7、t to change without notice. RadioFans.CN 收音机爱 好者资料库Fig. 1 .1 .3 haSl ?Ow Is v-. CF1 ?CF2 Wde IF Amp IF Amp IF band Selector Switch CF3 ?CF4 Pet. Rect. IF Amp IF Amp Muting ON/OFF FM Antenna 0 ? 75 ohm SSS Controller AM Loop Antenna ?0 Bandsuppres Circuit Front End Narrow B.P F FM Demodu- lator IIII

8、0 Output L Output R Amp 9 EC Oscillator Signal Selector Switch L.P.F ? Amp Stereo Demodulator L.P.F Amp AM RF-IF Del Monaural/ Stereo Selector Switch Signal to AC line Signal/Noise Indicator Quality ?SSS Indicator ?Indicator Fig. 2 ALL Controller Control Switch Display Driver FM ?MHz Frequency Displ

9、ay PIP Roof Filter Roof Filter Tuning,FM/AM Memory Preset Noise Switching Display Driver Stereo Indicator TU-787 MIMI CONTROLS AND THEIR DESCRIPTION 0 POWER (Power on/standby Switch) Note: The power switch contains an ON/OFF indicator (except in models exported to Europe) REC (Recording Level Switch

10、) IF BAND (IF Band Selector Swich) MODE (Mode Switch) a. Auto/Mute, ?Mono 0 SCAN (Tuning Mode Select Switch) AL Auto, ?Manual I SSS I ON/OFF (See Page 8 for Details Regarding the Super Searcher System-I SSSI ) 8 AM FM 0 DIGITAL FREQUENCY INDICATOR BLOCK DIAGRAM SSS Switch (110 STEREO (Stereo Indicat

11、or) SIGNAL/NOISE LEVEL ?. Signal ?AL Noise QUALITY (Quality Indicator) SSS (Super Searcher System Indicator) PRESET CHANNEL 1 8 (Station Presetting Buttons) 8 MEMORY (Memory Button) QM CONTROLLER (Super Searcher System Control Knob) TUNING (Tuning Buttons) ?Up , ? Down I 3 I= 0 FM INDOOR ANTENNA DIR

12、ECTION OF BROADCASTING STATION FM ANTENNA It 75 ohm coaxial cable AM OUTDOOR ANTENNA 12 m or longer sizes are approximate /f/i/, (FOR WEAK WAVE RECEP-TION/ 1. Ground the wire to the earth when an outdoor antenna Is used. 2. Do not detach the lead wires of the loop antenna from the terminals. ACCESSO

13、RY LOOP AN-TENNA Removal of AM loop an-tenna Move the supporting rod of the loop antenna up-ward to remove the an-tenna. INSERT 0E2 To tuner terminals 00 Do oaci .00 ut.te PRE AMPLIFIER WALL OUTLET Fig. 3 DIN CONNECTOR J 8m or longer )111111111ITU-767 CONNECTIONS PRECAUTIONS ON CONNECTIONS Do not pl

14、ug the cord into an AC outlet until all connections of the unit are completed. CONNECTION WITH AUDIO AMPLIFIER Connect the pin. cord (supplied) between the OUTPUT terminals of the tuner and the tuner input terminals of the audio amplifier. Be careful to connect the left (L) and right (R) channels of

15、 the output terminals to the corresponding left (L) and right (R) channels of the tuner input terminals. (Set the volume control of the audio amplifier to mini-mum). Do not bundle or wind the pin plug and the power source cord together, and do not place the pin cord near the power transformer; other

16、wise, hum noise may result. Insert the plugs into the corresponding jacks firmly because incomplete connections cause electric field noise. FM ANTENNA COAXIAL CABLE Li Fold back about 12 mm of braid. If core is stranded wire, bind the tip with solder. B mm 3 mm E77 After tightening the cap, check th

17、at the cable shows no sign of comming loose. SOLDER OUTDOOR ANTENNA GROUNDING ROD Fig. 5 TU 767 MINI1 ANTENNA INSTALLATION FM OUTDOOR ANTENNA CONNECTION (Fig. 4) 75 ohm coaxial cable (3C-2V, 5C-2V) is preferable to obtain better performance of the tuner. * Contact your local dealer for details on se

18、lection and installation of the FM outdoor antenna. * When a 300 ohm FM antenna is connected by a 75 ohm coaxial cable, a matching transformer is required. AM ANTENNA CONNECTION (Fig. 5) Since the model is provided with a high performance AM loop antenna on the back panel, this accessory antenna can

19、 effectively be used for optimal reception in places where broadcasting stations are located nearby and relatively strong signals are received with low noise. Orient the loop antenna horizontally to obtain optimal reception. In places where strong, clear signals are not received due to particular lo

20、cation and/or environmental conditions, connect an insulated wire to the AM antenna terminals and attach it to the wall. In places where broadcasting stationa are located too far away and only weak signals are received, or where signals are blocked by obstacles, install an AM outdoor antenna. * Even

21、 if an AM outdoor antenna is installed, do not detach the AM loop antenna. GROUNDING If there is much noise during reception, it is recommended that a grounding wire be used. Connect a thick insulated wire to the GND terminal, and wind the unconnected bare end around a metal water pipe, a grounding

22、rod, or a grounded copper plate. * Never connect grounding the wire to a gas pipe. This could cause fire or explosion. Fig. 4 LOOP ANTENNA METHOD OF ADJUSTMENTS When marking adjustments, be sure the power supply is at the rated voltage and the room air is in normal condition with respect to temperat

23、ure and humidity. ADJUSTMENT OF RF TRAP UNIT (ETC(1658J) (ISSSI on,MODE . mono) Table 1 Adjustment Item Tuning Input Side Output Side Adjustment Point Adjustment Value Measuring Instrument Frequency Input Level Modulation Connection Point Measuring Instrument Connection Point 1 88 MHz Tracking Check

24、 88.0 MHz FM SSG 88.0 MHz Variable depending on output wave- form attenuation Mono ?1 kHz 100% Antenna Terminal Digital Voltmeter VC. G 3 V t 10 mV at the time of adjustment to the max. point of output waveform attenuation using the ISSSf controller 2 108 MHz Tracking Check 108.0 MHz FM SSG 108.0 MH

25、z Variable depending on output wave- form attenuation _ kHz ono ?1 100% Mono Antenna Terminal Digital Voltmeter G 20 V t 100 mV at the time of adjustment to the max. point of output waveform attenuation using the ?SSS ?controller 3 If NG in items 1 and 2, advance to items 4 to 6 4 108 MHz Tracking 1

26、08.0 MHz FM SSG 108.0 MHz Variable depending on output wave- form attenuation Mono ?1 kHz 100% Antenna Terminal , Oscilloscope Output IL) TC1 Output waveform attenuation is max. at 20 V i 50 mV 5 88 MHz Tracking 88.0 MHz FM SSG 88.0 MHz Variable depending on output wave- form attenuation Mono ?1 kHz

27、 100% Antenna Terminal Oscilloscope Output (LI LI Output waveform attenuation is max. at 3 V 5 mV 6 Repeat the adjustment in items 4 and 5 so that the waveform attenuation is maximum at the rated voltage 7 Adjustment of Attenuation 98.0 MHz FM SSG 98.0 MHz Variable depending on output wave- form att

28、enuation Mono ?1 kHz 100% Antenna Terminal Oscilloscope Output ll.) VRI Adjust to max. attenuation after adjustment to the max. point of output waveform attenuation using the ?SSS controller Normal Output Waveform Distortion of Output Waveform due to Input Attenuation Fig. 6 9 at 0 2 0 -f- -n CONNEC

29、TION DIAGRAM OF MEASURING INSTRUMENTS FM ?Table 2 Adjustment Item Tuning Input Side Output Side Adjustment Point Point Adjustment Value Remarks measuring Instrument Frequency Input Level Modulation Connection Point Measuring Instrument Connection 1 76 kHz 98.0 MHz FM SSG 98.0 MHz 60 dBp Mono 1 kHz,

30、100% TA:rt4747 , Frequency Counter TP-3, 4 VS 201 76 kHz 050 Hz 2 Adjustment 98,0 MHz FM SSG 98.0 MHz 50d59 Mono 1 kH, 100% rAztrreninnea, Tuning Meter JIg T P-1,2 T2 Tuning Meter Canter J. IF ?wide 3 Mono Distortion gen MHz FM SSG 98.0 MHz BO dl3p Mono 1 brie, 100% Antenna Terminal Distortion Meter

31、 Output IL/ 13 Min. Distortion IF ?-111. ?wide 4 Stereo Distortion 98.0 MHz FM SSG 98.0 MHz 60d80 Stereo IL) ?1 kHz Main ?90% Pilot ?10% Antenna Terrninal Distortion Meter Output (1.) Front End I FT Mtn. Distortion IF AL wide 5 Tuning Center Distortion Adjustment Repeat Items 2 to 4 so that the tuni

32、ng meter may indicate Its center value, and the distortion is minimum at tuning time 6 OffsettTu2strnent 980 MHz FM SSG 98.0 MHz 60 dBp Mono 1 kHz, 100% DC Voltmeter IF-B, GND VS 401 100 0 10 rnV ?,84Yr4c47.74t4 e; , Noise Indicator LED ON Level 98.0 MHz FM SSG 98.0 MHz 3409 Mono 1 kHz, 100% Antenna

33、 Terminal VS 402 7th N ?LED ?By SSS controller oise ON ?In J. noise mode 8 SLIgErigoInNdItcreavetoir 98.0 MHz FM SSG 98.0 MHz Llsgi8n4 Mono 1 kHz,100% TAenrt4747, V R 4 Quality LED ?By SSS controller ON ?in J noise mode 9 QLuzlgyoiNntlec,at.oi r 98.0 MHz FM SSG 98.0 MHz 50 dBp Mono 1 kHz, 100% Anten

34、na Terminal VS 403 7th Signal LED ?By SSS controller ON ?In JIL noise mode 10 _ RECAdLieuvsetZuttput 98.0 MHz FM SSG 98.0 MHz 60 deg Mono 1 kHz, 100% Antenna Valve Voltmeter Output IL/ VS 3 6 df3 x 1 dB of 100% Output ?SEC . on 11 Pilot Cancel! 980 MHz FM SSG 980 MHz 60459 Stereo ILI ?10% Pilot Ante

35、nna Terminal Valve Voltmeter Output ILI VS 202 Min. Pilot ?19/38 kHz L.P.F. Leakage ?is not used 12 Separation 98,0 MHz FM SSG 98.0 MHz 60409 Stereo (1.) ?1 kHz Main ?90% Filet ?10% Antenna Terminal Voltmeter Output (L/ Output 181 Output VS 203 Max. SePnratk1n ?19/38 kHz L.P.F. (balance of ?is used

36、di realvity/ 13 IF Narrow Distortion Adjustment 98.0 MHz FM SSG 98.0 MHz 60 dElp Stereo (LI ?1 kHz Main ?90% Pilot ?10% Antenna Terminal Distortion Meter Output (1.) Ti MM Distortion ?IF . narrow _ in AN dejrzLnGatin 980M FM SSG 98.0 MHz 1st Signal LED ON when wide 14 Stereo ILI ?1 kHz Main ?90% Pil

37、ot ?10% Antenna Terminal VA 1 Equalization of let signal LED ON level at narrowswitchi ?wng ?IF .I narrow time 16 0i5troFrtoartrrg4eck 98.0 MHz FM SSG 98.0 MHz 130 dBsi Stereo IL) Mono Antenna Terminal Distortion Meter Output IL/ If standard value Mono ?Under 0.7 Stereo Under 1% recpen:tIttebm711Tan

38、ndd 1 4 AM 1 IF Adjustment No. sot ai nd 9. Frequency oi (wM. .1 , ,F No-IF Waveform Distortion Lev& A1vilvo/rNmnra Monitor Scope 6311 T 303 Flat at Max. IF Waveform 2 522 vkol-lictaTguening 522 kHz Digital Voltmeter 8301 1305 1.2 V 0 20 mV 2 1611 kHz Tuning Voltage 1611 kHz Digital Voltmeter R301 I

39、C 303 8 V 0 100 my Repeat ltesm 2 and 3 to obtain rated tuing voltage 5 503 kHz Tracking 1303 brie AM SSG 803 kH Non-AGC Level 400 Hz, 30% Loop Antenna Valve Voltmeter Output IL/ 1301 , Mac Out Adjust the SG output not to undergo AGC 6 1404 kHz Tracking 1404 brie AM SSG 1404 kHz Non-AGC Level 400 Hz

40、, 30% Loop Antenna Valve Voltmeter Output IL/ IC 301 Max. Output Adjust the SG output not to undergo AGC Repeat itanre Rand 8 to adjust the tracking 8 Signal Indicator LED ON Level 999 kHa AM SSG ?999 kHz 70 c113p/m ?400 H, 30% ?Loop Antenna ?VP 401 7th Signal LED ON -n -41 VR5A0 VRA01 VRAEM VR FA.0

41、 1-1 fiA132 ICI iC402 VRA02 e A 106 71.2 71511 9 ?I 1C40I 0 05 GNO v. 22 ?1C403 570659 11 DEMOVi L.02 0 LP203 CF30 I CF303 0301 a cl 0 Ili IrOZie W lY ?FL, ETC-658 ,r047P3 I ? crao, T305 TC303 NM AL D 00 ANT TERMINAL RP TRAP UNIT 0 VR203 VR202 C5 0 ETC0659 Fig. 8 TUNING METER JIG Bend Suppress Circu

42、it End Input Level Interference Wave ?r,ueney DI and D2 disappear when attenuating A or B to minimum Band Suppress arcun C,aracter Input Level f I Fig. 10 SEMICONDUCTORS in NJM45580 (JRC) HA112223W HA 2412 (Htachi) HA I 223W H014027E1 (Hitachi) TA7060AP (Toshiba) HA 12412 01111 TU-767 ROUGH DIAGRAM

43、OF ADJUSTMENT POINTS ?PRINCIPLE OF SUPER SEARCHER SYSTEM (SSS) If two or more powerful stations are on the FM band, unexpected radio waves are generated in an area between them. This is called intermodulation disturbance. When receiving a station near these generated waves, a ragged sound or other d

44、isturbing noises occur. Fig. 10 explains this situation. Intermodulation components D1 and 02 are generated by stations A and 8, disturbing the desired reception station C. Interference wave D1 cannot be separated from the wave of station C. However, by removing this disturbance caused by A and B wi

45、th the band suppress circuit, D1/132 will disappear. Operation: If the signal indicator (green) is lit, but the quality indicator is disturbance is present. Tam ON the SSS switch, and set the SSS controller to ( ) noise mode. Adjust the SSS controller volume so that the noise level indicator (red) s

46、hows the minimum value. Band suppress circuit -= RE trap filter (Frequency variable) If an other station has been selected, the SSS is rest auto-matically. -8- TD6301 AP (Toshiba) TC9147P (Toshiba) FUNCTIONS OF TERMINALS Pin No. Name Function Pin No. Name Function 1 L/D Output status select input te

47、rminal. Input terminal for selecting output status by the indicator (LED, FL, LCD). 6-12 a g 7-segment drive output terminal. 10 MHz-unit display at FM time. 100 kHz-unit display at AM time. 2 Data Receiving frequency data input terminal. Input serially by the system controller LSI. 13, 1 at-g5 7-se

48、gment drive output terminal. 1 MHz-unit display at FM time. 10 kHz-unit display at AM time. 3, 4 CK1 CK2 Received frequency data input control timing input terminal. Transferred simultaneously with data by the system controller LSI. 21-27 a1gl 7-segment drive output terminal. 100 kHz-unit display at

49、 FM time. 1 kHz-tmit display at AM time. 5 1/0 Segment drive output terminal. 100 MHz-unit display at FM f ?time. Only 1 pin is used or output becau,se of 1 to 0 in both FM/AM. 14, 28 Vcc GND Supply voltage applying terminal. FUNCTIONS OF TERMINALS 12 19 20 21 34 35 DO-2 DO-1 TU-767 OM t. ?i, a, ?a,

50、 0 ?0, ?I, a, ?0, ?a, ?t,lt, MAT critrilif i 7,teroonen oi ixal- :NZ c 11 ?BCD 01flet ,C1( L/0 GNP FUNCTIONS OF TERMINALS Pin No. Function Name Symbol Connects crystal 7.2 MHz for reference frequency. 2 XT Crystal oscillator terminal 3 XT FM band specifying input FM 4 Selects FM. MW and LW in the mu