Panasonic-SATM54-cs-sm 电路图 维修手册.pdf

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1、ORDER NO. MD0512479C1 A6 Speaker System SC-TM54 Colour (S). Silver Type SB-TM54 MODEL UNIT SC-TM54SA-TM54Stereo SB-TM54Front Speaker SB-WTM54 Subwoofer POTENCIA DE SALIDA (AMPLIFICADOR) SC-TM54 Frontal (Bajo) 90 W RCM por canal (3) 1kHz, 10% DAT (Alto) 90 W RCM por canal (3) 10kHz, 10% DAT Subwoofer

2、 180 W RCM por canal (8 ) 10% DAT Amplificador SA-TM 54 Potencia de salida 6000 W (P.M.P.O) Consumo de potencia 132 W Sencibilidad music port: 100 mV Rango de sintona AM:520-1710MHz (paso de 0,2 MHz) Rango de sintona FM: Dimensiones (b x h x l) 250 mm x 330 mm x 343mm Peso:6.6 kg aprox Alimentacin 1

3、27 V ca 10% 60 Hz 87.9-107.9 MHz (paso de 0,2 MHz 87.5-108.0 MHz (paso de 0,1 MHz Bafles SB-TM 54 FRONTAL Bocina Super TweeterPiezo type Bocina Tweeter 6 cm Bocina Woofer 16 cm IMPEDANCIAAlto y bajo 3 Dimensiones (b x h x l) 247 mm x 330 mm x 221 mm Peso:2.8 kg aprox Bafle SB-WTM 54 SUBWOOFER 16 cm

4、IMPEDANCIA Subwoofer8 Dimensiones (b x h x l) 248 mm x 330 mm x 256 mm Peso:3.6 kg aprox Specifications Notes: Specifications are subject to change without notice. Mass and dimensions are approximate.Total harmonic distortion is measured by the digital spectrum analyzer. 2004 Matsushita Electric Ind

5、ustrial Co. Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law. SA-TM54SB-WTM54SB-TM54 1 RadioFans.CN 收音机爱 好者资料库 1 Safety Precautions 1.1. General Guidelines 1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which ha

6、ve been overheated or damaged by the short circuit. 2. After servicing, ensure that all the protective devices such as insulation barriers and insulation papers shields are properly installed. 3. After servicing, check for leakage current checks to prevent from being exposed to shock hazards. (This

7、“Safety Precaution” is applied only in U.S.A.) 1. Before servicing, unplug the power cord to prevent an electric shock. 2. When replacing parts, use only manufacturers recommended components for safety. 3. Check the condition of the power cord. Replace if wear or damage is evident. 4. After servicin

8、g, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc. 5. Before returning the serviced equipment to the customer, be sure to make the following insulation resistance test to prevent the customer from being exposed to a shock hazard. 1.1.1. Leakage Current Cold C

9、heck 1. Unplug the AC cord and connect a jumper between the two prongs on the plug. 2. Using an ohmmeter measure the resistance value, between the jumpered AC plug and each exposed metallic cabinet part on the equipment such as screwheads, connectors, control shafts, etc. When the exposed metallic p

10、art has a return path to the chassis, the reading should be between 1M and 5.2M. When the exposed metal does not have a return path to the chassis, the reading must be. Fig. 1 1.1.2. Leakage Current Hot Check (See Figure 1) 1. Plug the AC cord directly into the AC outlet. Do not use an isolation tra

11、nsformer for this check. 2. Connect a 1.5k, 10 watts resistor, in parallel with a 0.15F capacitor, between each exposed metallic part on the set and a good earth ground such as a water pipe, as shown in Figure 1. 3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to measure the potenti

12、al across the resistor. 4. Check each exposed metallic part, and measure the voltage at each point. 5. Reverse the AC plug in the AC outlet and repeat each of the above measurements. 6. The potential at any point should not exceed 0.75 volts RMS. A leakage current tester (Simpson Model 229 or equiva

13、lent) may be used to make the hot checks, leakage current must not exceed 1/2 milliamp. Should the measurement is out of the limits specified, there is a possibility of a shock hazard, and the equipment should be repaired and rechecked before it is returned to the customer. 1.2. Before repair and ad

14、justment Disconnect AC power, discharge Power Capacitors C5101, C5104, C5171, C5172, C5920, C5940 and C5950 through a 10, 5W resistor to ground. DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy solid state devices. After repairs are completed, restore power

15、 gradually using a variac, to avoid overcurrent. Current consumption at AC 120V, 60 Hz in NO SIGNAL mode (volume min at CD mode) should be 500mA.2 RadioFans.CN 收音机爱 好者资料库 1.3. Protection Circuitry The protection circuitry may have operated if either of the following conditions are noticed: No sound

16、is heard when the power is turned on. Sound stops during a performance. The function 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 less than the indicated rated impedance of

17、the amplifier are used. If this occurs, follow the procedure outlines below: 1. Turn off the power. 2. Determine the cause of the problem and correct it. 3. Turn on the power once again after one minute. Note : When the protection circuitry functions, the unit will not operate unless the power is fi

18、rst turned off and then on again. 1.4. Caution for fuse replacement 2 Prevention of Electro Static Discharge (ESD) to Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by electricity. Such components commonly are called Electrostatically Sensitiv

19、e (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor “chip” components. The following techniques should be used to help reduce the incidence of component damage caused by electro static discharge (ESD). 1. Immediately before handl

20、ing any semiconductor component or semiconductor-equiped assembly, drain off any ESD on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging ESD wrist strap, which should be removed for potential shock reasons prior to applying power to the

21、unit under test. 2. After removing an electrical assembly equiped with ES devices, place the assembly on a conductive surface such as aluminium foil, to prevent electrostatic charge build up or exposure of the assembly. 3. Use only a grounded-tip soldering iron to solder or unsolder ES devices. 4. U

22、se only an anti-static solder remover device. Some solder removal devices not classified as “anti-static (ESD protected)” can generate electrical charge to damage ES devices. 5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ES devices. 6. Do not rem

23、ove a replacement ES device from its protective package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminium foil or comparable conductive material). 7. Immediately before removing the p

24、rotective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed. Caution Be sure no power is applied to the chassis or circuit, and observe all other safety precautions. 8. Minimize body motions wh

25、en handling unpackaged replacement ES devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity (ESD) sufficient to damage an ES device). 3 RadioFans.CN 收音机爱 好者资料库 4 3 Handling Precaution

26、s For Traverse Deck The laser diode in the traverse deck (optical pickup) may break down due to potential difference caused by the static electricity of clothes or our human body. So, be careful of electrostatic breakdown during repair of the traverse deck (optical pickup). Way of handling the trave

27、rse deck (optical pickup) 1. Do not subject the traverse deck (optical pickup) to static electricity as it is extremely sensitive to electrical shock. 2. To prevent the breakdown of the laser diode, an antistatic shorting pin is inserted into the flexible board (FFC board). 3. Do not to apply excess

28、ive stress to the flexible board (FFC board). When removing or connecting the short pin, finish the job in as short time as possible. 4. Do not turn the variable resistor for laser power adjustment. (It is pre-adjusted during production time) Grounding for electrostatic breakdown prevention 1. Human

29、 body grounding Use the anti-static wrist strap to discharge the static electricity from your body. 2. Work table grounding Put a conductive material (sheet) or steel sheet on the area where the traverse deck (optical pickup) is place, and ground the sheet. Caution : The static electricity of your c

30、lothes will not be grounded through the wrist strap. So, take care not to let your clothes touch the traverse deck (optical pickup). Caution when replacing the Traverse Deck The traverse deck has a short point shorted with solder to protect the laser diode against electrostatics breakdown. Be sure t

31、o remove the solder from the short point before making connections. 5 4 Precaution of laser diode CAUTION: This unit utilizes a class 1 laser diode in the optical pickup unit . Invisible laser radiation is emitted from the optical pickup lens. Wavelength: 780nm When the unit is turned on: 1. Do not

32、look directly into the optical pickup lens. 2. Do not use optical instruments to look at the optical pickup lens. 3. Do not adjust the preset variable resistor on the optical pickup lens. 4. Do not disassemble the optical optical pickup unit. 5. If the optical pickup is replaced, use the manufacture

33、rs specified replacement pickup only. 6. Use of control or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. CAUTION! THIS PRODUCT UTILIZES A LASER. USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECI

34、FIED HEREIN MAY RESULT IN HAZARDOUS RADIATION EXPOSURE. n Use of caution label (Except for U.S.A.) 6 5 Handling the Lead-free Solder 5.1. About lead free solder (PbF) Distinction of PbF P.C.B.: P.C.B.s (manufactured) using lead free solder will have a PbF stamp on the P.C.B. Caution: Pb free solder

35、has a higher melting point than standard solder; Typically the melting point is 50 - 70F (30 - 40C) higher. Please use a high temperature soldering iron. In case of soldering iron with temperature control, please set it to 700 20F (370 10C). Pb free solder will tend to splash when heated too high (a

36、bout 1100F/600C). When soldering or unsoldering, please completely remove all of the solder on the pins or solder area, and be sure to heat the soldering points with the Pb free solder until it melts enough. 7 6 New Features 6.1. CRS1 Mechanism Overview 6.1.1. General Feature This is a five disc cha

37、nger mechanism for CD/DVD. The outline figure is shown below. 8 The mechanism has CHANGE WHILE PLAY function. It open other trays for disc exchanging while one tray is at PLAY position performing recording or reproducing. The mechanism can quickly change all trays with CHANGE ALL function. All trays

38、 can be move to OPEN position with one operation. There is no sensor to indicate presence of disc on any tray. 6.1.2. Hardware composition Below is the hardware components of the mechanism NameFunction Open Switch (OPEN-SW)The switch is used to detect normal tray opening The switch is used for detec

39、t tray being manually push/trigger when full open Home Switch (HOME-SW)Is used to detect cam gear home position Close Sensor (CLOSE-SENSOR)Used for normal single tray closing Used to detect cam gear rotate to Play Driving position Play Switch (PLAY-SW)Detect TRV clamping complete position Stocking S

40、witch (STOCK-SW)Detect tray completely transfer for play position to stocking position UD Sensor (UD-SENSOR)Detect TRV vertical movement position Top Switch (TOP-SW)Detect a default position of TRV vertical movement position Driver ICTo drive Motor MotorMain driving source for changer PlungerSwitchi

41、ng the driving source from motor to: 1. Tray open/close 2. Drive tray to play/stock position and TRV vertical movement 6.1.3. Mechanism Operation This mechanism has the following state: 1. Driving of a tray to open/close 2. Up/down operation of a traverse performs a state changes of tray. By using t

42、he plunger to lift/release of a switching gear, and the cam gear to lift/release the function gear the motor can be link to several gear trains to perform various operations. The functions that can be perform in this mechanism are described as below: ConditionExplanation Open current playing trayThe

43、 state to change current playing disc. All tray will be open at once and current tray at PLAY position will be expose. Open AllThe state where all trays being driven to OPEN position. The disc can be taken in or out from tray to tray by close tray one by one from top to bottom. StockThe state where

44、the trays are stored in STOCK position PlayThe state where one of the tray 5 trays is being driven to PLAY position and clamped by traverse unit Play QZZCWAT 13.1.1. Tape Speed Adjustment (Deck 1/2) 1. Insert the test tape (QZZCWAT) to DECK 2 and playback (FWD side) the middle portion of it. 2. Adju

45、st Motor VR (DECK 2) for the output value shown below. Adjustment target: 2910 3090 Hz (NORMAL speed) 3. After alignment, assure that the output frequency of the DECK 1 FWD are within 60 Hz of the value of the output frequency of DECK 2 FWD. Fig. 1 13.1.2. Bias Voltage Check 1. Set the unit “AUX” po

46、sition. 2. Insert the Normal blank tape (QZZCRA) into DECK 2 and the unit to “REC” mode (use “l REC/STOP” key). 3. Measure and make sure that the output is within the standard value. Bias voltage for Deck 2144mV (Normal) Fig. 2 Fig. 3 13 Adjustment Procedures 13.1.3. Bias Frequency Adjustment (Deck

47、1/2) 1. Set the unit to “AUX” position. 2. Insert the Normal blank tape (QZZCRA) into DECK 2 and set the unit to “REC” mode (l use “REC/STOP” key). 3. Adjust L1002 so that the output frequency is within the standard value as below. Standard Value: 89 110 kHz Fig. 4 13.1.3.1. Cassette Deck Section Be

48、low is the locations of test points for Deck P.C.B.:- 45 SA-AK640P / SA-AK640PC 43 13.2. Tuner Section This section include details on the alignment of AM-IF and AM RF adjustment. 13.2.1. AM-IF Alignment 1. Set up the equipments as shown in Fig. 5. 2. Select TUNER mode on selector and set to AM mode

49、. 3. Apply signal as shown in Fig. 5 from AM-SG. 4. Adjust Z2602 accordingly so that the output frequency is maximized at 450kHz in Fig. 6. Fig. 5 Fig. 6 13.2.2. AM RF Adjustment 1. Set up the equipments as shown in Fig. 7. 2. Select TUNER on selector and set to AM mode. 3. Set AM-SG to 520kHz. 4. Receive 520kHz in the unit. 5. Adjust L2601 (OSC) so that