Panasonic-RX1490-cs-sm 电路图 维修手册.pdf

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1、ORDER NO. RD82112046C3 Service Manual Radio Cassette RX-1490/A FM-AM Radio Cassette Recorder SPECIFICATIONS General: Power Requirement: AC; 110115/115127/200220/ 230250 V, 50/60 Hz AC: 240 V 50 Hz (Australia Only) Battery; 7.5 V (Five-UM-1 “D” Size Flashlight Batteries) (National UM-1 or equivalent)

2、 Radio Section: Radio Frequency Range: Intermediate Frequency: Sensitivity: FM; 88108 MHz AM; 5251605 kHz (571187 m) FM; 10.7 MHz AM; 455 kHz FM; 2.8uV/50 mW output Power Consumption: 8 W (AC only) AM; 50nV/m/50 mW output Power Output: 2.5W. RMS (max.) Tape Deck Section: Speaker: Woofer; 12 cm (423/

3、32) PM Dynamic Frequency Response: 809,000 Hz Speaker (30) Recording system: DC bias, Magnet erase Tweeter; 3. cm (13/16) PM Dynamic Tape Speed: 4.8cm/s, (17/s ips) Speaker (420) Program Time: 1 hour with C-60 cassette tape Input: MIC; sensitivity 0.25 mV (72 dB)/ Track System: 2-track 1 channel mon

4、aural recording applicable microphone impedance and playback 2006000 EXT SP; 382 Dimensions: 348 mm(W) x 223 mm(H) x 123 mm(D) (131/16 813/16 47/s)” Weight: 2.4 kg (5 Ib. 4.7 oz.) without batteries Specifications are subject to change without notice. National Panasonic Matsushita Electric Trading Co

5、., Ltd. P.O. Box 288, Central Osaka Japan RadioFans.CN 收音机爱 好者资料库 RX-1490/A LOCATION OF CONTROLS AND COMPONENTS Tape Counter and Reset Button (COUNTER) 6) M Cassette Compartment LED Power Indicator (POWER) LED Record Indicator (RECORD) ) Pause/Eject Button (PAUSE/EJECT) Stop Button (STOP) Fast Forwa

6、rd/Cue Button (FF/CUE) Rewind/Review Button (REW/REVIEW) Playback Button (PLAY) Record Button (RECORD) Selector Switch (SELECTOR) POWER OFF /TAPE, AM, FM 42 Telescopic Antenna 43) Tone Control (TONE) Volume Control (VOLUME) 45) Tweeter 3 cm (13/16) 40 Tuning Control (TUNING) 4? Built-In Microphone (

7、MIC) EXT. MIC Jack 0.25 mV(-72 dB ) 20060012 EXT. SP Jack 380 Fig. 1 AC Socket t) Woofer 12 cm (423/32) 3Q DISASSEMBLY INSTRUCTIONS ) Pee = (ee) Fig. 3 (G) (K) (J) (D) Fig. 4 (L) *1. When the tape is caught in the pinchi roller, etc. Remove this cap and release the tape by turning the pulley on the

8、motor with the screwdriver in the direction of the arrow as shown in Fig. 2. *2. Toremove the handle arm, cut the rib of handle arm. *3. Push the leg of cassette panel in the direction of arrows as shown in Fig. 4. *4, Put in the deck, watching the recording rod is set in the recording lever, as sho

9、wn in Fig. 5. Mechanism (*4) Main Circuit Board Power Circuit Board Cassette Panel RadioFans.CN 收音机爱 好者资料库 RX-1490/A RX-1490/A ALIGNMENT POINTS DIAL THREADING Pointer Turn tuning Capacitor to fully counterclockwise direction eTurn drum to fully clockwise direction Fig. 6. MEASUREMENTS AND ADJUSTMENT

10、S ALIGNMENT INSTRUCTION READ CAREFULLY BEFORE ATTEMPTING ALIGNMENT 1. Set volume control to maximum. 2. Set tone control to treble. 3. Selector switch to AM or FM. AM AND FM ALIGNMENT SWEEP GENERATOR RADIO DIAL BAND SETTING Fashion loop of several turns of 455 kHz wire and radiate 30% Mod. signal in

11、to loop of at 400 Hz receiver. 4. Set power source voltage to 7.5 V DC. 5. Output of signal generator should be no higher than necessary to obtain an output reading. INDICATOR VOCIMEILE. | ADJUSTMENT REMARKS or SCOPE) AM-IF ALIGNMENT Point of non- interference. (on/ about 600 kHz) Output meter T3 (A

12、M 1st IFT) Adjust for maximum across voice coil. | T4 (AM 2nd IFT) output. AM-RF ALIGNMENT 525 kHz Tuning capacitor 6(AM OSC) Adjust for aximum fully closed. Coil) = 1 et kHz | Tuning capacitor CT4 (AM OSC |, nae open. Trimmer) moving coil bobbin 550 kHz Tune to signal. (*1) L5 (AM ANT Coil) along f

13、errite core. Adjust for maximum 1,500 kHz CT3 (AM ANT output. Trimmer) Repeat steps (2)(5). (*1) Cement antenna bobbin with wax after completing alignment. FM-IF ALIGNMENT ae for maximum output. Adjust L5 by High side thru. Connect vert. (6) FM 0.001 uF to test 10.7 MHz Point of non- amp. of scope A

14、djust for maximum point W . Negative (SWP.) interference. (on/ totest point YW. | 71 (FM 1stiIFT) amplitude. av to test point about 90 MHz) Negative y to (Refer to fig. 8.) test point W Adjust for maximum T2 (FM 2nd IFT) amplitude. (Refer to fig. 9.) FM-RF ALIGNMENT W through FM dummy antenna. Negat

15、ive side to test point 8. Variable Output meter L4 (FM OSC (*2) Adjust for maxi- (8) FM 86.2 MHz capacitor across Coil) mum output. Connect to test point fully closed. voice coil. 9) FM Lad 109.3 MHz | Variable capacitor CT2 (FM OSC fully open. Trimmer) 106 MHz CT1 (FM ANT Trimmer) (*2) Three output

16、 responses will be present; proper tuning is the center frequency. (#2) Adjust for maxi- mum output. Repeat steps (8)(10). (10) FM 109.3MHz Fig. 8 FM 2nd 10.7MHz | Fig. 9 Fig. 10 D Telescopic ANT IC | FM RF AMP/CONV FM IF/DET & AM RF/CONV/IF/DET B+ (A) C-MIC | 5 VRI-VR2 VOLUME TONE 0 3 Jl | EXT SP S

17、PEAKER J2 o oO WOOFER l2cm (4 23/45 ) 3N a f|SPEAKER ee Otweerer 0 O 3 REC 3cm (1 3/16) 4nN R/P LO HEAD S2-5 S2-3 VRI-VR2 - VOLUME TONE T | EXT SP : WOOFER P z= l2cm(4 23/30 ) R/P 3N HEAD SPEAKER SOP Weeren 3cm (1 3/16) 40 Fig. 11 RadioFans.CN 收音机爱 好者资料库 | RX-1490/A RX-1490/A SCHEMATIC DIAGRAM MODEL

18、 RX-1490/A IC | DI QI Ic2 D5,6 AN72I3 MAI50 2SC829 AN7220A RVDIN4002 TELESCOPIC FM RF AMP,OSC FM AGC FM IF AMP FM/AM IF AMP DET AM OSC/MIX RECT ANTENNA VS- eR Te ee ee eee ee ee are 4006) (0.05) (0,06) (338) (338) (338) (338) 0) (335) 40) (440) (444) (397) (397) (398) (897) (0) (456) 045) 0.03) 0) (

19、042) (247) 3.16) (392) (320) in O (0) (047) (049) (3.27) (382) GSD 414) C4K330P + f54 100 R55 2.2K Ril 220 BUILTIN | YY , Poe. MIC O5S55 Se = oc St-t = ce iL Ree 220K% ae R 73 100 xR 2 Up eek a = EXT. | 28 E SG MIC I SN a 0.25 mV (-12d B) es 200 6000. = wt RYp _o* 380 314 744 183 HEAD CP2 (34 pnd S3

20、 310 393 380 720 eae 6) Hw pe S &) arsT 4 G) ) mle moe &* A Ji = 2 =i bab” EXT. SP =a =| 38Q 5 ee qe may N wz = cm 4 32) SA) is ELh. WOOFER coor SPEAKER : ee oA 3m (1376) 4.2 Q2 D2 Q3,4 D3,4 IC3 | = TWEETER 2SC1I684 MAISO 2SCiI684 LN2I7RP RVIUPCI2I3C REC AGC AGC RECT EQ AMP LED INDICATOR POWER AMP N

21、otes: 1. S1-1S1-4: Selector switch in “TAPE” position. 7. VR2: Tone control. 11. Important safety notice (1. TAPE,2.AM,3. FM) | 8. The mark (WW) shows test point, e.g. W =test point 1. Components identified by A mark have special characteristics 2. S2-1S2-6: Record/playback switch in “playback” posi

22、tion. 9. DC voltage measurement are taken with electronics voltmeter from important for safety. (1. Playback, 3. Record) negative terminal of battery. When replacing any of these components, use only manufac- 3. S3: Motor ON/OFF switch in OFF” position. .FM position, ( ). AM position, turers specifi

23、ed parts. 4. S4: AC/DC IN select switch in “DC IN” position. , .- Recording position. (2.AC,3.DC) 10. Battery current: Nosignal .2222 20sec eee 38 mA 5:55: Voltage select switch. Maximum output (radio) . 260 mA (The model for Australia has no AC voltage selector) Maximum output (tape) . 320 mA 6. VR

24、1: Volume control. Cathode wa +(B)Voltage Line Tape (PLAY BACK) Signal Line a : Radio (FM) Signal Line eveee Tape (RECORD) Signal Line IC1 AN7213 IN Vcc GND OUT IC2 AN7220A IC3 RVIUPC1213C IN FILTER Vcc OF Ca Oa” (3)_)8) 8) FILTER NFB OUT CIRCUIT BOARD AND WIRING CONNECTION DIAGRAM MODEL RX-1490/A T

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