Panasonic-RXFT550-cs-sm 电路图 维修手册.pdf

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1、ORDER NO. MD8905019G2 Service Manual stereo Radio Cassette Recorder Radio Cassette RX-FT550 Color (K) Black Type Area Country Code Areas Color (E) Continental Europe (K) (EB) Great Britain (K) (EG) F.R. Germany Output; Dimensions: Weight: AC; (E)(EG). 220 V, 50 Hz (EB) 240 V, 50 Hz Battery; 9V(SixUM

2、-1 R20/LR20 Batteries) 16W(AC only) 8W(4Wx2).RMS(max.) 20W(10Wx2).PMPO 10W(5Wx2).MPO Woofer; 10 cm PM Dynamic Speaker (2.70) Tweeter; CERAMIC Speaker l.5cm CD/LINEIN; 398 mV, 47 kO HEADPHONES; 320,03.5 556 (W) X150 (H) X146 (D)zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA mm 3 kg without batt

3、eries Radio Sectlon: Radio Frequency Range: Intermediate Frequency: Sensitivity: Tape Deck Sectlon: Frequency Response: Tape Speed: Track System: Tape Deck Sectlon: Frequency Response: Recording System: Tape Speed: Track System: FM; 87.5-108 MHz LW; 148.5-285 kHz MW; 520-1610 kHz SW; 5.9-18 MHz FM;

4、10.7 MHz AM; 459 kHz FM; 2.2zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA MV/50 mW output (-3 dB Limit Sens.) LW; 200 MV/m/50mW output MW; 200 MV/m/50 mW output SW; 5.6 pV/SOmW output TAPE1 50-12,000 Hz 4.8 cm/s 4-track 2-channel stereo playback TAPE 2 50-13,000 Hz AC bias, Magnet erase 4.8 c

5、m/s 4-track 2-channel stereo recording and playback Design and specifications are subject to change without notice. Panasonic Matsushita Electric Industrial Co., Ltd. Central P.O. Box 288, Osaka 530-91, Japan RadioFans.CN 收音机爱 好者资料库 X-FT5 5 0 LOCATION OF CONTROLS o e e p e Q Q Q p 53 oiDsR Oislc O H

6、eadphones Jack (PHONES) (03.5,320) Speakers automatically cut off when headphones are connected. When using the headphones, avoid listening to sound for a long period of time and avoid excessive volume levels, which may Injure your ears. O Built-in Microphone (MIC) O Graphic Equalizer Controls (GRAP

7、HIC EQUALIZER) O Volume Control (VOLUME) 0 Function Selector (SELECTOR) I Tape 1 (For Playback) Direction Button ( D I R ) Stop/Eject Button ( B STOP/EJECT) Fast Buttons (- F A S T ) Playback ButtonzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA MP- PLAY) Tape 1 Reverse Mode Selector (REV MODE)

8、 O CD/LIne Input Jacks (CD/LINE IN) (398 mV, 47 kO) Editing/FM Mode Selector/Beat Proof Switch (EDITING/FM M OOeS.P) TAPE 2 (For Recording and Playback) Pause Button (zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBAI IPAUSE) Stop/Eject Button ( B STOP/EJECT) Fast Forward Button (-4-4 FF) Rewind

9、Button ( REW) Playback Button M PLAY) Record Button (|RECORD|) When the tape is caught in the pinch roller, etc. Release the tape by turning the pulley on the motor with the screwdriver in the direction of the arrow. (D Band Selector (BAND) (D Tuning Control (TUNING) Speakers (Tweeter) (1.5 cm) E )

10、Speakers (Woofer) (10 cm, 2.70) (O Tape 2 Cassette Compartment (D FM Stereo Indicator (FM STEREO) D Tape 1 Cassette Compartment D X B S Level Control (XBS LEVEL) 234 R e mova l of the M e cha nism O 1. Remove 3 screws (0)- CP2 CP3 2. Remove 3 connector (CP2, CP3, CP4). - 3 - RadioFans.CN 收音机爱 好者资料库

11、RX-FT550 Ref. No. 6 Removal of the Record Lever Ref. No. 7 Removal of the Main P.C.B. Procedure Record Lever Procedure 5 7 Iciaw Remove the screw (O)- - r - i II / Ref. No. 8 Procedure Removal of the Tuning Gear 1. Remove 2 connector (CP1, CP6). 2. Release 4 claws In the direction of arrows and remo

12、ve the selector knobs. 3. Remove 9 screws(0)- Tuning Gear Remove the screw (O)- Ref. No. 9 Removal of the Tuner P.C.B. Ref. No. 10 Removal of the Antenna P.C.B. Procedure 6-89-10 1. Remove the connector (CP1). 2. Remove2screws(0. ) Ref. No. 11 Procedure 1-11 Removal of the Power P.C.B. 1. Remove the

13、 screw (O)- I I I I I I I I I j j 1 5 W W L=Q. L - Antenna P.C.B. CP6 Claw I claw 2. Release 2 claws. claw 1. Remove 3 screws(0)- 2. Release the claw in the direction of arrow. - 4 - RX-FT550 Ref. No. 12 Removal of the Speaker Ref. No. 13 Removal of the Cassette Holder Procedure 112 Procedure 113 Re

14、move 8 screws O0)- Rib Rib Release 4 ribs in the direction of arrows. Ref. No. 14 Removal of the Mechanism P.C.B. Ref. No. 15 Removal of the Battery P.C.B. Procedure 115 Mechanism P.C.B. 1. Remove the solder. 2. Remove the connector (CP5). 3. Remove the screw (O)- Screwdriver 1. Release the claw in

15、the direction of arrow . 2. Remove the battery P.C.B. in the direction of arrow . Ref. No. 16 Removal of the Battery Spring Ref. No. 17 Removal of the Graphic Equalizer Holder Procedure 16 Procedure 1 2 5 17 Claw Graphic Equalizer Holder Claw Battery Spring 1. Remove the battery cover. 2. Release th

16、e claw and remove the battery spring in the direction of arrow. Graphic Equalizer P.C.B. Claw Release 4 screws. Ref. No. 18 Removal of the Pointer Ref. No. 19 Removal of the Tuning Knob Procedure 1 2 3 1 8 Procedure 1 2 3 1 8 19 Tuning Knob Release 2 claws in the direction of arrows and then remove

17、the pointer in the direction of arrow . 1. Release the spring in the direction of arrows , . 2. Remove the tuning knob in the direction of arrow - 5 - RX-FT550 Notes When Assembling HOW TO MOUNT THE MAIN P.C.B. Switch / I Headphones Jack V 1. Insert the headphones jack into the hole in the rear cabi

18、net. 2. Insert the boss of the switch in the selector control. HOW TO MOUNT THE GRAPHIC EQUALIZER P.C.B. Groeve Secure the connector to the sockel. Reinstall it by sliding it in the direction of the arrow. HOW TO MOUNT THE TUNER P.C.B. Band Knob Band Switch Insert the boss of the switch in the selec

19、tor control. HOW TO MOUNT THE CASSETTE HOLDER HOW TO MOUNT THE GRAPHIC EQUALIZER HOLDER 5 Graphic Equalizer Holder Graphic Equalizer P.C.B. HOW TO REPLACE THE TWEETERS Remove these 4 welded points with a cutter of similar tooi. After replacing the tweetors, weid after mounting. HOW TO ATTACH THE STO

20、PPER SPRING , 4, Stopper Spring Groove Securely fix the stopper spring in the groove. HOW TO MOUNT THE DIAL CHASSIS / Dn EU Rgure seen from the rear skjeol the front Cabinet. Pointer 1. Align the pointer as shown in the figure above. ,1, ,1, ,1, ,1, Tuning Gear 2. Mount the Mechanism. 3. Fully turn

21、the tuning gear in the direction of the arrow. f Dial Chassis I M I D 4 I I I I I Spring 4. Attach the dial chassis. - 6 - RX-FT550 MEASUREMENTS AND ADJUSTMENS ALIGNMENT INSTRUCTION READ CAREFULLY BEFORE ATTEMPTING ALIGNMENT 1. Set volume control to maximum. 2. Set Graphic E.Q. to center. 3. Set ban

22、d switch to LW, MW, SW or FM. 4. Set function selector to radio or tape. 5. Set power source voltage to 9 V DC. 6. Set FM mode/B.P switch to STEREO/111. 7. Output of signal generator should be no higher than necessary to obtain an output reading. LW, MW and SW ALIGNMENT BAND SIGNAL GENERATOR or SWEE

23、PGENERATOR RADIO DIAL SETTING INDICATOR (ELECTRONIC VOLTMETER or OSCILLOSCOPE) ADJUSTMENT REMARKS CONNECTIONS FREOUENCY RADIO DIAL SETTING INDICATOR (ELECTRONIC VOLTMETER or OSCILLOSCOPE) AM-IF ALIGNMENT (1) MW Fashion a loop of several turns of wire and radiale the signal into loop ant. of the rece

24、iver. 459 kHz 30% Mod. at 400 Hz Point of non- interference. (on/ about 600 kHz) Headphones Jack (320) /Fabricaletheplugas shown inFig.2. and then connect the lead wires of the plug to the measuring . / T2 (AMIFT) Adjust for maximum output. LW-RF ALIGNMENT (2) LW (E) (EB) .136 kHz (EG).137 kHz Tunin

25、g capacitor fully closed. L8(LW 0SC Coil) (3) LW 297 kHz Tuning capacitor fully open. CT3 (LW OSC Trimmer) (4) LW 145 kHz Tune to signal (1)L5-1 (LW ANT Coil) Adjust for maximum output. Adjust L5-1 by moving the fernte core. (5) LW 285 kHz M CT2 (LW ANT Trimmer) Adjust lor maximum output. Repeat ste

26、ps (2)(5). (1) Cement antenna lerhte core with wax after completing alignment. MW-RF ALIGNMENT (6) MW (E) (EB) .511 kHz (EG).514 kHz Tuning capacitor fully closed. L9(MWOSC Coil) Adjust for maximum output. (7) MW (E) (EB) .1650 kHz (EG).1639 kHz Tuning capacitor fully open. CT1-3(MW0SC Trimmer) - (8

27、) MW 550 kHz Tune to signal (2) L5-2 (MW ANT Coil) Adjust for maximum output. Adjust L5-2 by moving the ferrite core. (9) MW 1500 kHz CT1-4 (AM ANT Trimmer) Adjust for maximum output. Repeat steps (6)(9). (2) Cement antenna ferrite core with wax atter completing alignment. f - 1 4 - RX-FT550 BAND SI

28、GNAL GENERATOR or SWEEP GENERATOR RADIO DIAL SETTING INDICATOR (ELECTRONIC VOLTMETER or OSCILLOSCOPE) ADJUSTMENT REMARKS CONNECTIONS FREQUENCY RADIO DIAL SETTING INDICATOR (ELECTRONIC VOLTMETER or OSCILLOSCOPE) SW-RF ALIGNMENT (10) SW Connect to test point 021 through ceramic capacitor (10 pF). Nega

29、tive side to test poim QS. 5.75 MHz Tuning capacitor fully closed. Headphones Jack (320) /Fabncate the plug as shown in Fig. 2. and then connect the lead w:res of the plug to the measunng Vinstrument. / L10(SW OSC Coil) Adjust tor maximum output. (11) SW Connect to test point 021 through ceramic cap

30、acitor (10 pF). Negative side to test poim QS. 18.8 MHz Tuning capacitor fully open. CT4 (SW OSC Trimmer) M (12) SW Connect to test point 021 through ceramic capacitor (10 pF). Negative side to test poim QS. 5.9 MHz Tune to signal. L7 (SW ANT Coil) Adjust tor maximum output. Repeat steps (10)(12). F

31、M ALIGNMENT BAND SIGNAL GENERATOR or SWEEP GENERATOR RADIO DIAL ShI lING INDICATOR (ELECTRONIC VOLTMETER or OSCILLOSCOPE) ADJUSTMENT REMARKS CONNECTIONS FREQUENCY RADIO DIAL ShI lING INDICATOR (ELECTRONIC VOLTMETER or OSCILLOSCOPE) FM-IF ALIGNMENT (13) FM High side thru. 0.001 MFtotest point IQ. Neg

32、ative side to test point D. 10.7 MHz(SWP) Point of non- interference. (on/ aboutgOMHz). Connect vert. amp. of scope to test point 033 Negative side to test point QIS Tl (FM IstlFT) Waveform is shown Fig. 3. (14) FM T3 (FM 2nd IFT) Wave form is shown Fig. 4. FM-RF ALIGNMENT (15) FM Connect to test po

33、int lljll through FM dummy antenna. Negative side to test point 02. (E)(EB) .86.2 MHz (EG).87.35MHz Variable capacitor fully closed. Headphones Jack (320) /Fabncate the plug as shown in Fig. 2. and then connect the lead wires of the plug to the measunng Vinstrument. / L4(FM OSC Coil) (2) Adjust for

34、maximum output. (16) FM Connect to test point lljll through FM dummy antenna. Negative side to test point 02. (E) (EB) .109.2 MHz (EG).108.25 MHz Variable capacitor fully open. CT1-1 (FM OSC Trimmer) (17) FM 106 MHz Tune to signal. CT1-2(FM ANT Trimmer) Adjust for maximum output. Repeat steps (15)(1

35、7). (2) three output responses will be present; proper tuning is the center frequency. SEPARATION ALIGNMENT FM SIGNAL GENERTOR SOURCE CONNECTION EQUIPMENT CONNECTION ELECTRONIC COUNTER ADJUSTMENT SPECIFICATION REMARKS 98 MHz, 60 dB (CW) Connect to test point 021 through FM dummy antenna. Negative si

36、de to QS- QS.(+) QS.(-) VR1 19 kHz Adjust VR1, for 19 kHz 50 Hz reading on frequency counter. HEAD AZIMUTH ALIGNMENT TEST TAPE EQUIPMENT CONNECTION ELECTRONIC COUNTER ADJUSTMENT SPECIFICATION REMARKS QZZCFM (8 kHz, - 2 0 dB) Headphones Jack (320) Fabricate the plug as shown in Fig. 2. and then conne

37、ct the lead wires of the plug to the ineasuring instrument. / Azimuth screw (Shown in Fig. 6) Maximum output Playback mode. - 1 5 - RX-FT550 TAPE SPEED ADJUSTMENT TESTTAPE EQUIPMENT CONNECTION ELECTRONIC COUNTER ADJUSTMENT REMARKS Headphones Jack (320) Fabricate the plug as shown in Fig. 2. and then

38、 connect the lead wires of the plug to the measunng instrument. VR501 (Shown in Fig. 5) Normai Speed Adjustment 1. Insert a test tape (QZZCWAT) in Tape 2 and play it back. 2. AdjustVRSOI until the measured value becomes 300030 Hz. QZZCWAT (3 kHz) 3. Check Tape 1 in the same way to make sure it satis

39、fies the specification. Tape 1. 70 Hz of the speed of Tape 2. If it doesnt repeat steps 1 and 2 above. Note: This set uses one drive motor, so be sure to perform the adjustment in Tape 2. High Speed Measurement 4. Insert the playback tape into Tape 1 and the editing tape into Tape 2. 5. Set the Edit

40、ingzyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA Mode Selector to the HIGH position. 6. Press the Tape 2 Pause button, then press the Record Button. 7. Press the Tape 1 Playback Button. Editing is started by means of the Synchro-Start function. 8. Check to be sure that the measured speed is a

41、t least 1.7 times faster than normal speed. ALIGNMENT POINT Please refer to Circuit Board and Wiring Connection Diagram for test point locations. MW ANT ISOOkHz Band Switch SW MW LW FM FM OSC 86.2MHz (E,EB) 87.35MHz (EG) FM 2nd 10.7MHz T MW OSC LW OSC MW OSC 1650kHz (E,EB) l36kHz (E,EB) 511kHz (E,EB

42、) LW OSC 1639kHz (E(5) 137kHz (EGI 5l4KHz (EG) 297kHz SW OSC 5.75MHz T3 CTI-3 L 8 L 9 CT3 LIO Fig. 1 To Headphones To fVleasuring Instrument R = 32n Fig. 3 Fig. 4 Fig. 2 MECHANISM CONTROL P.C.B Fig. 5 TAPE SPEED IvRSOll Azimuth Screw TAPE1 TAPE 2 Fig. 6 - 1 6 - RX-FT550 REPLACEMENT PARTS LIST T HOIT

43、ADOJ aiilA Notes : * Important safety notice : Components identified by A mark tiave special characteristics important for safety. When replacing any of these components use only manufacturers specitied parts. * Bracketed indications in Ref. No. columns specify the area. (Refer to the first page for

44、 area.) Parts without these indications can be used for all areas. * Q Indicates parts that are supplied by MESA. Ref. No. Part No. Description Ref. No. Part No. Description INTEGRATED CIRCUITS ICl IC2 IC3 IC30t tcace IC303 AN7205 BA4236L RVIBA1332L AN7312 LA4108R AN7330K I .C. FM FRONT END I.C. IFA

45、MP.DET. I .C. FM MPX I .C. PRE AMP I .C. POWER AMP 1 .C. G.E.Q.AMP VRl VRIOI VR102 VR103 VR104 VR105 VR501 RVNCA1481T-A EWAGa6T50G54 EWAQQ6T50G54 EWAGQ6T50GS4 EWAGF2T50e2W J : 5 % ERG Melal Oxide 14 1/4W 25: 1/4W F : 1 % ERQ Fuse Type Metal IA 1W 18 1/8W Q : 2 % ERX Metal Film S2 1/4W SI 1/2W J : 5

46、% ERD L Carbon (ctiip) 2F 1/4W 50-1/2W K : 10% ERO K Metal Film (chip) 2A 2W 3A 3W M : 20% ERC Solid 6G 1/10W 8G 1/8W ERF Incombustible Box-Shaped ERM Wire-Wound RRJ Chip Resistor ERJ Chip Resistor ECKD Type CEA Type 1H 102 Voltage (50V) 50 Voltage 50V) Value Tolerance Unique (0.001 MF) M 330 Cliara

47、cteristics Value (33IJF) Capacity values are in microlarads (MF) uniess speellied olherwise. P = Pico-(arads (pF) F = Farads (F). Resislance values are in ohms (Q), uniess specified olherwise, IK = 1.0000, 1M = 1,000kQ Capacitor Type Voltage Tolerance ECE : Eiectrolytic OJ : 6.3V IA 10V K: 10% ECCO

48、: Ceramic IC 16V IE 25V M : 20% ECKD ; Ceramtc Capacitor IH 50V IV 35V Z- + 8 % ECQM ; Polyester 50: 50V 05 50V -20 ECQP : Polypropylene 2H 500V 2A 100V J : 5 % ECG : Ceramic 1 : lOOV IJ 63V G : 2 % ECEA N : Non Polar Eiectrolytic KC : 400V AC F: 1 % QCU : Ceramic (Chip Type) KC : 125VAC C : 0.25pF ECUX : Ceramic (Chip Type) (UL) D : 0.5pF EOF : Semiconductor EECW