Technics-SUA707-int-sm 电路图 维修手册.pdf

《Technics-SUA707-int-sm 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《Technics-SUA707-int-sm 电路图 维修手册.pdf（62页珍藏版）》请在收音机爱好者资料库上搜索。

1、Table Of Contents COVER 1 Before Repair 2 Protection Circuitry 3 Accessories 4 Caution for AC Mains Lead 5 Operations 6 Operation Checks and Component ReplacementProcedures 7 About the+/- 15 V Line Abnormality Detect Function 7.1 About the abnormality detect function with the operation LED turned of

2、f 8 Schematic Diagram 8.1 Schematic Diagram Notes 8.2 Schematic Diagram 9 Printed Circuit Board Diagram 10 Wiring Connection Diagram 11 Type Illustration of ICs, Transistors and Diodes 12 Block Diagram 13 Measurements and Adjustments 13.1 Measuring Instruments and Special Tools 13.2 Output Voltage A

3、djustment RadioFans.CN 收音机爱 好者资料库 14 Terminal Function of ICs 14.1 IC801 (M38503M2405F) : System Control 15 Replacement Parts List 16 Cabinet Parts Location 17 Packaging RadioFans.CN 收音机爱 好者资料库 PV PV Service Manual TOP NEXT AD9908184C2 Stereo Integrated Amplifier SU-A707 Colour (K).Black Type Areas

4、(E).Europe and Russia. (EB).Great Britain. (EG).Germany, France and Italy. RadioFans.CN 收音机爱 好者资料库 1999 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law. TOP NEXT 1 Before Repair TOP PREVIOUS NEXT 1. Turn off the power supply.

5、Using a 10, 10 W resistor, connect both ends of power supply capacitors (C701, C702) in order to discharge the voltage. 2. Before turning the power supply on, after completion of repair, slowly apply the primary voltage by using a power supply voltage controller to make sure that the consumed curren

6、t at 50 Hz in NO SIGNAL mode should be shown below with respectto supply voltage 230/240 V. Power supply voltage AC 230 V, 50 Hz AC 240 V, 50 Hz Consumed current 70-270 mA 60-260 mA TOP PREVIOUS NEXT 2 Protection Circuitry TOP PREVIOUS NEXT The protection circuitry may have operated if either of the

7、 following conditions is noticed: No sound is heard when the power is switched ON. Sound stops during a performance. The functions of this circuitry is to prevent circuitry damage if, for example, the positive and negative speaker connection wires are shorted, or if speaker systems with an impedance

8、 less than the indicated rated impedance of this unit are used. If this occurs, follow the procedure outlined bellow: 1. Switch OFF the power. 2. Determine the cause of the problem and correct it. 3. Switch ON the power once again. Note: When the protection circuitry functions, the unit will not ope

9、rate unless the power is first switched OFF and ON again. TOP PREVIOUS NEXT 3 Accessories TOP PREVIOUS NEXT AC mains lead (E) and (EG) areas : (RJA0019-X). 1 pc. (EB) area : (RJA0053-2X).1 pc. Remote control transmitter (RAK-SUA11WH).1 pc. Batteries (R6/LR6, AA, UM-3).2 pcs. Note: These are availabl

10、e on sales route. TOP PREVIOUS NEXT 4 Caution for AC Mains Lead TOP PREVIOUS NEXT 5 Operations TOP PREVIOUS NEXT TOP PREVIOUS NEXT 6 Operation Checks and Component Replacement/Procedures TOP PREVIOUS NEXT TOP PREVIOUS NEXT 7 About the+/- 15 V Line Abnormality Detect Function TOP PREVIOUS NEXT 1. Thi

11、s model features the function that shuts down the main power source when it check the 15 V line with the IC801 (microcomputer) and find the different voltage. (After power is turned on, the unit enters the stand-by mode.) 2. When the unit enters stand-by mode with abnormality detected, check the cir

12、cuits around the 15 V line. (Specially check the abnormality of the stabilizing power source circuit.) 3. To clear this stand-by mode, short-circuit the TP801 land on the circuit board. However, clearance of the stand-by mode and turn on the electricity when the repair is not completed may lead to a

13、nother trouble. Therefore, be especially carefulto do so. (Do not turn on the electricity for a long time.) 4. When the repair is completed, leave the TP801 open. 7.1 About the abnormality detect function with the operation LED turned off TOP PREVIOUS NEXT 7.1 About the abnormality detect function w

14、ith the operation LED turned off TOP PREVIOUS NEXT 1. If the operation LED is turned off, there are possibilities of the following abnormalities in addition to the LED itself malfunctioning: 2. Power amplifiers malfunction by the speaker terminal short-circuit. 3. Malfunction of cooling fan. The uni

15、t features the function that detects above abnormalities. TOP PREVIOUS NEXT 8 Schematic Diagram TOP PREVIOUS NEXT 8.1 Schematic Diagram Notes 8.2 Schematic Diagram TOP PREVIOUS NEXT 8.1 Schematic Diagram Notes TOP PREVIOUS NEXT This schematic diagram may be modified at any time with the development

16、of new technology. Notes: S204: Unit on/off switch (/I) S801: Input select switch (TAPE 1) S802: Input select switch (TAPE 2/MD) S803: Input select switch (AUX) S804: Input select switch (DVD) S805: Input select switch (CD) S806: Input select switch (TUNER) S807: Input select switch (PHONO) S808: VG

17、CA switch () S809: Tape monitor (SOURCE) switch (TAPE MONITOR) S810: Tape monitor (TAPE 2/MD) switch (TAPE MONITOR) S811: Tape monitor (TAPE 1) switch (TAPE MONITOR) S812: Speaker select switch (SPEAKER B) S813: Speaker select switch (SPEAKER A) VR201: Volume control VR (VOLUME) VR202: Balance contr

18、ol VR (BALANCE) VR203: Output voltage adjustment VR (L ch) VR204: Output voltage adjustment VR (R ch) VR301: Tone control VR (BASS) VR302: Tone control VR (TREBLE) Indicated voltage values are the standard values for the unit measured by the DC electronic circuit tester (high-impedance) with the cha

19、ssis taken as standard. Therefore, there may exist some errors in the voltage values, depending on theinternal impedance of the DC circuit tester. No mark : Power ON Important safety notice: Components identified by mark have special characteristics important for safety. Furthermore, special parts w

20、hich have purposes of fire-retardant (resistors), high-quality sound (capacitors), low-noise (resistors), etc. are used. When replacing any of components, be sure to use only manufacturers specified parts shown in the parts list. Caution! IC and LSI are sensitive to static electricity. Secondary tro

21、uble can be prevented by taking care during repair. Cover the parts boxes made of plastics with aluminum foil. Ground the soldering iron. Put a conductive mat on the work table. Do not touch the legs of IC or LSI with the fingers directly. Voltage and signal line : Positive voltage line : Negative v

22、oltage line : Phono signal line : Tape rec signal line 8.2 Schematic Diagram TOP PREVIOUS NEXT TOP PREVIOUS NEXT 9 Printed Circuit Board Diagram TOP PREVIOUS NEXT TOP PREVIOUS NEXT 10 Wiring Connection Diagram TOP PREVIOUS NEXT TOP PREVIOUS NEXT 11 Type Illustration of ICs, Transistors and Diodes TO

23、P PREVIOUS NEXT TOP PREVIOUS NEXT 12 Block Diagram TOP PREVIOUS NEXT TOP PREVIOUS NEXT 13 Measurements and Adjustments TOP PREVIOUS NEXT 13.1 Measuring Instruments and Special Tools 13.2 Output Voltage Adjustment TOP PREVIOUS NEXT 13.1 Measuring Instruments and Special Tools TOP PREVIOUS NEXT AC ele

24、ctronic voltmeter (AC EVM) AF oscillator TOP PREVIOUS NEXT 13.2 Output Voltage Adjustment TOP PREVIOUS NEXT 1. Turn on the power. 2. Select the input source to TUNER. 3. Connect the measuring instrument as shown Fig.1 4. Apply 1 kHz, 100 mV to TUNER terminal. 5. Adjust the VOLUME to maximum. 6. Adju

25、st VR203 (L ch) and VR204 (R ch) so that the output voltage to AC 14.0 0.2 V. Shown in Fig.2 Fig.1 Adjustment point Fig.2 TOP PREVIOUS NEXT 14 Terminal Function of ICs TOP PREVIOUS NEXT 14.1 IC801 (M38503M2405F) : System Control TOP PREVIOUS NEXT 14.1 IC801 (M38503M2405F) : System Control TOP PREVIO

26、US NEXT Pin No. Name I/ O Function 1 VCC I Power supply terminal 2 VREF I Reference voltage input 3 AGND - GND terminal 4 MUTE LED O LED drive signal output (Mute) 5 STBY LED O LED drive signal output (Stand by) 6 REMCON I Remote control signal input 7 BACKUP I Power failure detect signal input 8 NC

27、 - Not used, connected to GND 9 SEL DATA O Data signal output for input select IC (IC201) 10 SEL CLK O Clock signal output for input select IC (IC201) 11 SEL STB O Strobe signal output for input select IC (IC201) 12 POWER SW I Power switch (S204) detect signal input 13 LED O - Not used, open 14 LED

28、C O Input select LED drive signal output 15 CNVSS - Connected to GND 16 LED B O Input select LED drive signal output 17 LED A O Input select LED drive signal output 18 RESET I System reset signal input 19 X IN I Connected to the ceramic oscillator (8 MHz) 20 X OUT O Connected to the ceramic oscillat

29、or (8 MHz) 21 GND - GND terminal 22 TAPE2 LED O LED drive signal output (Tape 2) 23 TAPE1 LED O LED drive signal output (Tape 1) 24 SOURCE LED O LED drive signal output (Source) 25 SP B LED O LED drive signal output (Speaker B) 26 SP A LED O LED drive signal output (Speaker A) 27 VRDOWN O Motor driv

30、e signal output (Volume down) 28 VRUP O Motor drive signal output (Volume up) 29 S MUTE O Audio muting control signal output 30 POWER O Power relay control signal output 31 SP B RLY O Speaker B relay control signal output 32 SP A RLY O Speaker A relay control signal output 33 VGCA RLY O VGCA mode re

31、lay control signal output 34 TAPE1 RLY O Tape 1 relay control signal output 35 DVD RLY O DVD relay control signal output 36 CD RLY O CD relay control signal output 37 MON RLY O Monitor relay control signal output 38 VGCA LED O LED drive signal output (VGCA mode) 39 VIA LED O LED drive signal output

32、(VIA mode) 40 REG MON I Regulation monitor signal input 41 KEY AD2 I Operation key signal input 42 KEY AD1 I Operation key signal input TOP PREVIOUS NEXT 15 Replacement Parts List TOP PREVIOUS NEXT Notes: Important safety notice: Components identified by mark have special characteristics important f

33、or safety. Furthermore, special parts which have purposes of fire-retardant (resistors), high-quality sound (capacitors), low-noise (resistors), etc. are used. When replacing any of components, be sure to use only manufactures specified parts shown in the parts list. The marks in Remarks indicate la

34、nguage of instruction manual. : English, Spanish, Swedish, Russian, Polish, Czech : English : German, Italian, French : Netherlandish, Danish The parenthesized indications in the Remarks columns specify the areas. (Refer to the cover page for area.) The marking (RTL) indicates that Retention Time is

35、 Limited for this item. After the discontinuation of this assembly in production, the item will continue to be available for a specific period of time. The retention period of availabilityis dependent on the type of assembly, and in accordance with the laws governing part and product retention. Afte

36、r the end of this period, the assembly will no longer be available. All parts are supplied by MESA. Ref. No.Part No.Part NameTape monitor buttons/indicators (TAPE MONITOR) Tone contols (BASS, TREBLE) =Balance control (BALANCE) Main unit 1 2 90 If the clear panel comes off 1Insert the panel as shown

37、in the illustration. 2Ensure the panel is parallel to the unit, then press firmly down and in on the levers until they click into place. 3Check that the panel now moves correctly. If it does not, remove it and repeat the above procedure. 77777 Connections Stereo phono cable (not included) Connection

38、s to other equipment GND REC (OUT) REC (OUT) PLAY (IN) PLAY (IN) PHONO TAPE 1 TUNER TAPE 2/MD AUXCDDVD L R GND REC (OUT) REC (OUT) PLAY (IN) PLAY (IN) PHONO TAPE 1 TUNER TAPE 2/MD AUXCDDVD REC (IN)PLAY (OUT) OUTPUTGND OUTPUT ANALOG IN ANALOG OUT OUTPUT OUTPUT AUDIO OUT VIDEO OUT MD deck (or second t

39、ape deck) (not included) White (L) Red(R) Tuner (not included) Tape deck (not included) Ground wire (not included) Turntable (not included) Second CD player, etc. (not included) CD player (or CD changer) (not included) DVD player (not included)TV (not included) Cooling fan The cooling fan operates a

40、t high power output levels only. Connecting the speakers Connecting the power supply SPEAKERS A B +RL SPEAKERS A B +RL Right speaker (not included) Left speaker (not included) Speaker cables (not included) “B” terminals For connection to a second pair of speakers. Speaker impedance When only the “A”

41、 or only the “B” terminals are used: 416 When the “A” and “B” terminals are used simultaneously: 816 Connecting the speaker cables 321 NO To prevent damage to circuitry, never short-circuit the positive (+) and negative () speaker wires. Caution AC IN Connect the AC mains lead only after all other c

42、onnections have been made. Insertion of connector Even when the connector is perfectly inserted, depending on the type of inlet used, the front part of the connector may jut out as shown in the drawing. However there is no problem using the unit. Connector Approx. 6 mm Appliance inlet Household main

43、s socket AC mains lead (included) BE SURE TO READ THE CAUTION FOR THE AC MAINS LEAD BEFORE CONNECTION. 77777 Listening Before operation, set VOLUME to the “MIN” position. Press /I. About 4 seconds later, the “OPERATION” indicator will light up. Select the speakers to be used. The corresponding speak

44、er indicator will illuminate. Press SOURCE. Press input select buttons to select the desired source. The corresponding indicator lights. TAPE 1: Tape deck TAPE 2/MD: Second tape deck or MD deck AUX: Component connected to the “AUX” terminals DVD: DVD player CD: CD player (or CD changer) TUNER: Tuner

45、 PHONO: Turntable Start the desired source. Refer to the appropriate operating instructions for details. Adjust the volume. After listening is finished Be sure to reduce the volume level, and turn the unit off by pressing the unit on/off button. 6 5 4 3 2 1 Preparation OPERATIONVOLUME 12364 1 2 3 4

46、/I SPEAKERS A B SOURCETAPE 2/MDTAPE 1 TAPE MONITOR TAPE 1TAPE 2/MD AUXDVDCDTUNER PHONO 6VOLUME MINMAX To adjust the sound balance A Turn BALANCE to adjust the left/right sound balance. The VGCA circuit This unit features a state-of-the-art variable gain control amplifier (VGCA). Rather than reducing

47、 the volume of the input signal and then amplifying it as was done in the past, this unit uses the VGCA circuit to change the gain of the amplifier itself. This has resulted in a 10 dB improvement on the S/N ratio of past models. Leave VGCA on during normal use. VGCA is switched on at the time of pu

48、rchase. To adjust the tone quality B 1Press VGCA to turn the “VIA TONE” indicator on. 2Turn BASS to adjust the low-frequency sound. Turn TREBLE to adjust the high-frequency sound. Press again to turn VGCA on again. Sound is heard unadjusted. To mute the sound level C Remote control only Press MUTING. The “MUTING” indicator on this unit will light up. Press again to restore the volume indicated by the volume control. The “MUTING” indicator will turn off. Muting is also canceled when the unit is turned o