Panasonic-SCTM22-cs-sm 电路图 维修手册.pdf

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1、SA-TM22SB-TM22SB-TM22 MODELO : SC-TM22 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? RadioFans.CN 收音机爱 好者资料库 1 Safety Precaution (This “Safety Precaution” is applied only in U.S.A.) Before servicing, unplug the power cord to prevent an electric shock. When replacing parts, use only manufacturers recommended

2、 components for safety. Check the condition of the power cord. Replace if wear or damage is evident. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc. Before returning the serviced equipment to the customer, be sure to make the following insula

3、tion resistance test to prevent the customer from being exposed to a shock hazard. 1.1 Insulation Resistance Test Unplug the power cord and short the two prongs of the plug with a jumper wire. Turn on the power switch. Measure the resistance value with ohmmeter between the jumper AC plug and each ex

4、posed metal cabinet part, such as screwheads, antenna, control shafts, handle brackets, etc.Measure the resistance value with ohmmeter between the jumper AC plugand each exposed metal cabinet part, such as screwheads, antenna, control shafts, handle brackets, etc. Equipment with antenna terminals sh

5、ould read between 2.7M and 3.9M to all exposed parts*. ( Fig.1 ) Equipment without antenna terminals should read approximately infinity to all exposed parts. ( Fig.2 ) *Note : Some exposed parts may be isolated from the chassisby design. These will read infinity. If the measurement is outside the sp

6、ecified limits, there is a possibility of a shock hazard. The equipment should be repaired and re-checked before it is returned to the customer. Fig.1 Fig.2 RadioFans.CN 收音机爱 好者资料库 2 Before Repair and Adjustment Disconnect AC power, discharge Power Supply Capacitors C520 and C540 through a 10, 5W re

7、sistor 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 gradually using a variac, to avoid overcurrent. Current consumption at AC 120V, 60 Hz in NO SIGNAL mode (volume min at CD mode

8、) should be 600mA. 3 Protection Circuitry The protection circuitry may have operated if either of the following conditions are noticed: No sound 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

9、positive and negative speaker connection wires are “shorted”, or if speaker systems with an impedance less than the indicated rated impedance of the amplifier are used. If this occurs, follow the procedure outlines below: Turn off the power. Determine the cause of the problem and correct it. Turn on

10、 the power once again after one minute. Note : When the protection circuitry functions, the unit will not operate unless the power is first turned off and then on again. 4 Prevention of Electro Static Discharge (ESD) to Electrostatically Sensitive (ES) Devices Some semiconductor (solid state) device

11、s can be damaged easily by electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistorsand semiconductor “chip” components. The following techniques should be used to help reduce th

12、e incidence of component damage caused by electro static discharge (ESD). Immediately before handling 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 ES

13、D wrist strap, whichshould be removed for potential shock reasons prior to applying power to the unit under test. 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

14、the assembly. Use only a grounded-tip soldering iron to solder or unsolder ES devices. Use 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. Do not use freon-propelled chemicals.

15、 These can generate electrical charges sufficient to damage ES devices. Do not remove 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, alumi

16、nium foil orcomparable conductive material). Immediately before removing the protective 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. RadioFans.CN 收音机爱 好者资料库 Caution Be sure no power is ap

17、plied to the chassis or circuit, and observe all other safety precautions. Minimize body motions when 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 elec

18、tricity (ESD) sufficient todamage an ES device). 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 has a higher melting point than standard solder; Typi

19、cally 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 (about 1100F/600C). When soldering or unsoldering, pleas

20、e 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. 6 Handling Precautions For Traverse Deck The laser diode in the traverse deck (optical pickup) may break down due to potential difference caused b

21、y static electricity of clothes or human body. So, be careful of electrostatic breakdown during repair of the traverse deck (optical pickup). Handling of traverse deck (optical pickup) Do not subject the traverse deck (optical pickup) to static electricity as it is extremely sensitive to electrical

22、shock. The short land between the No.4(LD) and No.5(GND) pins on the flexible board (FFC) is shorted with a solder build-up to prevent damage to the laser diode.To connect to the PC board, be sure to open by removing the solder build-up, and finishthe workquickly. Take care not to apply excessive st

23、ress to the flexible board (FFC). Do not turn the variable resistor (laser power adjustment). It has already been adjusted. Fig 6.1 Grounding for electrostatic breakdown prevention Human body grounding Use the anti-static wrist strap to discharge the static electricity from your body. Work table gro

24、unding Put a conductive material (sheet) or steel sheet on the area where the traverse deck (optical pickup) is placed, and ground the sheet. Caution : The static electricity of your clothes will not be grounded through the wrist strap. So, take care not to let your clothes touch the traverse deck (

25、optical pickup). Caution when Replacing the Traverse Deck : The traverse deck has a short point shorted with solder to protect the laser diode against electroststics breakdown. Be sure to remove the solder from the short point before making connections. Fig 6.2 7 Precaution of Laser Diode CAUTION: T

26、his unit utilizes a class 1 laser. Invisible laser radiation is emitted from the optical pickup lens. Wavelength: 780nm. When the unit is turned on: Do not look directly into the pick up lens. Do not use optical instruments to look at the pick up lens. Do not adjust the preset variable resistor on t

27、he pickup lens. Do not disassemble the optical pick up unit. If the optical pick up is replaced, use the manufacturers specified replacement pick up only. Use of control or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. CAUTION!

28、 THIS PRODUCT UTILIZES A LASER. USE OF CONTROLS OR ADJUSTMENTS OR PERFORMANCE OF PROCEDURES OTHER THAN THOSE SPECIFIED HEREIN MAY RESULT IN HAZARDOUSRADIATION EXPOSURE. Use of caution label 8 Accessories Remote Control Transmitter ( EUR7710020) FM Indoor Antenna (N1EAYY000004) AC Power Supply Cord (

29、 SJA168-1A ) AM Loop Antenna ( N1DADYY00002 ) 9 Operacion procedures ( see next page ) 10 Disassembly and Assembly of Main Component 10.1 Disassembly flow chart The following chart is the procedure for disassembling the casing and inside parts for internal inspection when carrying out the servicing.

30、 To assemble the unit, reverse the steps shown in the chart as below. 10.2 Disassembly of Top Cabinet and Rear Panel Step 1 Remove 3 screws on each side and 5 screws at rear panel. Step 2 Lift up both sides of top cabinet, push the cabinet assy toward the rear and remove it. Disassembly of Rear Pane

31、l Step 3 Remove 6 screws. Step 4 Draw rear panel backward to remove it. 10.2.1 Disassembly for CD Lid (The CD changer unit can be removed after the CD Lid is removed) Follow the (Step 1) - (Step 5) of Item 10.2 - Disassembly of Top Cabinet and Rear Panel When opening the disc tray automatically (Usi

32、ng Power Supply) Step 1 Connect the AC power cord. Step 2 Press the POWER button to power up the main unit. Step 3 Press the OPEN/CLOSE button, the disc tray will open automatically. Step 4 Release the 2 claws, and then remove the CD Lid. Step 5 Press the OPEN/CLOSE button, the disc tray will close.

33、 Open the disc tray manually (Using service tools) Step 1 Insert the gear tool into the hole on the underside of CD chassis and then rotate in the direction of arrow. The disc tray will be open. Step 2 Release the 2 claws, and then remove the CD lid cover. Step 3 Repeat Step 2 but rotate the gear to

34、ols in anti-clockwise direction. Step 4 The disc tray will be close. 10.3 Disassembly of CD Mechanism Unit Follow the (Step 1) - (Step 2) of Item 10.2 - Disassembly of Top Cabinet and Rear Panel Follow the (Step 1) - (Step 5) of Item 10.2.1 - Disassembly for CD Lid Step 1 Detach the FFC boards (CN30

35、9 QZZCWAT 15.1.1 Tape Speed Adjustment (Deck 1/2) Set the tape edit button to “NORMAL” position. Insert the test tape (QZZCWAT) to DECK 2 and playback (FWD side) the middle portion of it. Adjust Motor VR (DECK 2) for the output value shown below. Adjustment target: 2940 3060 Hz (NORMAL speed) After

36、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 14.2 CD Automatically Adjustment result indication Under CD test mode, pressing the numeric key 0 on the remote controller will display the auto adjustment result.

37、 FLOCK, TLOCK and CLVS status shall be shown as below: During the above display, executing CD PLAY will display auto adjustment result for CD PLAY mode. 15 Measurements and Adjustments 15.1.2 Bias and Erase Voltage Check Set the unit “AUX” position. Insert the Normal blank tape (QZZCRA) into DECK 2

38、and the unit to “REC” mode (use “ REC/STOP” key). Measure and make sure that the output is within the standard value. Bias voltage for Deck 2144mV (Normal) Erase voltage for Deck 280mV (Normal) Fig.2 Fig.3 15.1.3 Bias Frequency Adjustment (Deck 1/2) Set the unit to “AUX” position. Insert the Normal

39、blank tape (QZZCRA) into DECK 2 and set the unit to “REC” mode ( use “REC/STOP” key). Adjust L1002 so that the output frequency is within the standard value. Standard Value: 97 8 kHz Fig.4 15.2 Tuner Section 15.2.1 AM-IF Alignment Connect the instrument as shown in Fig.5. Set the unit to AM mode. Ap

40、ply signal as shown in Fig. 5 from AM-SG. Adjust Z102 so that the output frequency is maximized in Fig. 6. Fig.5 15.3 Alignment Points15.2.2 AM RF Adjustment Connect the instrument as shown in Fig. 7. Set the unit to AM mode. Set AM-SG to 520kHz. Receive 520kHz in the unit. Adjust Z101 (OSC) so that

41、 the EVM-AC is maximized. Set AM-SG to 600Hz. Receive 600Hz in the unit. Adjust Z101 (ANT) so that the EVM-SG is maximized. Set AM-SG to 520kHz. Receive 520kHz in the unit. Adjust Z101 (OSC) so that the EVM-DC value is with 1.10.5V. Fig.7 15.3.1 Cassette Deck Section 15.3.2 Adjustment Point IC101 LA

42、1833NMNTLM FM/AM IF AMP, DET/AM OSC, MIX/FM MPX FM ANT AM ANT A SD ST SHIFT REGISTER LATCH 1 2 SWALLOW COUNTER 1/6,1/17,4 BITS 12 BITS PROGRAMMABLE DIVIDER REFERENCE DIVIDER AM IFT 123 C2B I/F PLLCLK PLLDA ST/DO CE X103 DO/ST SD Z102 456 7 98101112 S-CURVE REG FM IF FM DET AM OSC LEVEL DET BUFFER 24

43、2322 ALC BUFFER 346 Z120 RF AMP 5 1 OSC MIXER 8 FM IF AMP Q101 7 CF201CF202 13161514 DECODER STEREO SWITCH AM DET AM IF TUNING DRIVE AM/FM IF BUFFER COMP FFFF REG VCO AM MIX AM RM AMP AGC 21201918 PHASE DET 17 PILOT DET FF PILOT CANCEL Z101 AM ANT COIL AM OSC COIL (FM) TUNER 15V SUPPLY SWITCH Q106 P

44、OWER ON RESET UNIVERSAL COUNTER UNLOCK DETECTOR PHASE DETECTOR CHARGE PUMP RCH Q1Q2 Q3Q4 (FM) TO CD DRIVE BLOCK PLL FREQUENCY SYNTHESIZER LC72131MDTRM IC102 X102 16 17 18 11 15 19107698 4CL 3DI 2CE 5DO 13 12 14 20 1 B B B B B B B MOTOR DRIVE C0GAM0000005 IC1 IC305C2CBJF000017MICROPROCESSOR REG MLD M

45、CLK CE MDATA SD CD_RST SWITCH BLKCK PLLCLK ST/DO PLLDA Q302 STAT Q303 RM1 SWITCH C0HBB0000040 FL DRIVER IC602 FL600 FL DISPLAYFROM POWER TRANSFORMER SW5 LOAD SW4 CD SW3 SW1 SW2 D1 POWER SUPPLY CONTROL Q1 Q323 Q324 CD MOTOR SUPPLY SWITCH PLUNGER MOTOR SUPPLY CONTROL SWITCH GRID11 2124,2733 GRID1 GRID

46、11 4,5,7,8,10,11,13,14,16,17,19,20, 22,23,25,26,28,31,33,35,37,40 GRID1 SEG1 312,1520 SEG16 SEG1 3,6,9,12,15,18,21,24,27, 29,30,32,34,36,38,39 SEG16 RSTB 41 71 FL_RESET CSB 42 72 FL_CS 74 FL_CLKSCK 43 SI 44 73 FL_DOUT XT 46 XTB 47 MLD 79 MDATA 80 MCLK 81 22 SD 771921 ST/DO 78 STATUS 84 CHG_CW 85 CHG

47、_CCW 88 CHG_PLR 83 CHG_HLF 89 CHG_AD2 90 CHG_AD1 86 CHG_SW1 87 CHG_SW2 PLLCE 25 23 PLLCK 24 PLLDA MBP1 6 X303 X_IN 15 X_OUT 13 MBP2 7 VR600 JOG VOL V_JOG_A 67 V_JOG_B 68 /RESTSW 82 IN15 IN26 VREF 4 VCC 7 GND 1 10OUT2 2OUT1 8VS D2 PUSH PUSH OPEN C0JBAE000192 XOR GATE IC603 4 1 S701 REST SW B B B B Q3

48、13, Q314 SWITCH B CD_RST BLKCK M AN7348S-E1 P.B EQ/REC AMP/ ALC/TPS AMP IC1001 C1AA00000612 IC1004 R/P SELECT IC971 PHOTO INTERRUPTER CNB13030R2AU MICROPROCESSORIC305C2CBJF000017 Q1016 Z971 INTERFACE S951 (MODE) Q1001,Q1003 SWITCHING (BEAT PROOF/ RECH) (DECK 2) ERASE HEAD (DECK 1) P.B. HEAD LCH L1002 BIAS OSC