Aiwa-NSXR20-cs-sm 电路图 维修手册.pdf

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1、SERVICE MANUAL DATA CD STEREO SYSTEM NSX-R20 NSX-R21 S/M Code No. 09-024-454-0N2 K(S) EZ(S) BASIC CD MECHANISM : BZG-2 ZD9GNC1 BASIC TAPE MECHANISM : CMAT6Z2(1+1)ALPS If requiring information about the CD mechanism, see Service Manual of BZG-2, (S/M Code No. 09-023-353-2N8). NSX-R20 SPEAKERSYSTEM CD

2、 CASSEIVER CX-NR20 REMOTE CONTROLLER RC-CAS03(VS) NSX-R21 SX-NR20 CX-NR21 RadioFans.CN 收音机爱 好者资料库 -2- SPECIFICATIONS .3 PROTECTION OF EYES FROM LASER BEAM DURING SERVICING . 4 NOTE ON BEFORE STARTING REPAIR . 5, 6 ACCESSORIES PARTS LIST -1/1 .7 ELECTRICAL PARTS LIST .8 21 TRANSISTOR ILLUSTRATION . 2

3、2 SCHEMATIC DIAGRAM -1/4 (MAIN-1/2, DECK/AMP/HP SECTION). 23 SCHEMATIC DIAGRAM -2/4 (MAIN-2/2, TUNER SECTION) . 24 WIRING -1/4 (MAIN C.B, HP C.B) . 25 SCHEMATIC DIAGRAM -3/4 (FRONT/DECK SECTION) . 26 WIRING -2/4 (FRONT C.B). 27 WIRING -3/4 (DECK C.B) . 28 SCHEMATIC DIAGRAM -4/4 (POWER SECTION) . 29

4、WIRING -4/4 (POWER C.B). 30 ELECTRICAL ADJUSTMENT. 31 37 LCD DISPLAY -1/1. 38 IC BLOCK DIAGRAM.39 41 IC DESCRIPTION .42 43 MECHANICAL EXPLODED VIEW -1/1. 44 MECHANICAL PARTS LIST -1/1. 45 COLOR NAME TABLE. 46 TAPE MECHANISM EXPLODED VIEW -1/1 . 47 CD TEST MODE . 48 TAPE MECHANISM PARTS LIST -1/1 . 4

5、9 GENERAL SPEAKER DISASSEMBLY INSTRUCTIONS (FOR REFERENCE) -1/1 . 50 SPEAKER PARTS LIST -1/1 (SX-NR20). 51 OTHER PARTS LIST -1/1. 52 TABLE OF CONTENTS RadioFans.CN 收音机爱 好者资料库 -3- SPECIFICATIONS MAIN UNIT (CX-NR20/CX-NR21) TUNER FM tuning range87.5 MHz to 108 MHz FM usable sensitivity (IHF)16.8 dBf F

6、M antenna terminal75 ohms (unbalanced) MW tuning range531 kHz to 1602 kHz (9 kHz step) 530 kHz to 1710 kHz (10 kHz step) MW usable sensitivity350 V/m LW tuning range144 kHz to 290 kHz LW usable sensitivity1400 V/m MW/LW antennaLoop antenna AMPLIFIER Power outputRated: 20 W + 20 W (6 ohms, T.H.D. 1 %

7、, 1 kHz/DIN 45500) Reference: 25 W + 25 W (6 ohms, T.H.D. 10 %, 1 kHz/DIN 45324) Total harmonic distortion0.08 % (13 W, 1 kHz, 6 ohms, DIN AUDIO) InputVIDEO/AUX: 500 mV OutputsSPEAKERS: 6 ohms or more PHONES: 32 ohms or more CASSETTE DECK Track format4 tracks, 2 channels stereo Frequency response50

8、Hz 15 kHz Recording systemAC bias HeadsDECK 1: playback x 1 DECK 2: recording/playback x 1, erase x 1 CD PLAYER LaserSemiconductor laser ( = 780 nm) D/A converter1 bit dual Signal-to-noise ratio85 dB (1 kHz, 0 dB) Harmonic distortion0.05 % (1 kHz, 0 dB) GENERAL Power requirements230 V AC, 50 Hz Powe

9、r consumption62 W Power consumptionWith ECO mode on: 0.6 W in standby modeWith ECO mode off: 20 W Dimensions (W x H x D)260 x 324 x 315 mm Weight5.5 kg FRONT SPEAKERS SX-NR20 Speaker system3 way, bass reflex (magnetic shielded) Speaker unitsWoofer: 120 mm cone Tweeter: 60 mm ceramic Super tweeter: 2

10、0 mm ceramic Impedance6 ohms Dimensions (W x H x D)210 x 324 x 215 mm Weight3.0 kg Specifications and external appearance are subject to change without notice. RadioFans.CN 收音机爱 好者资料库 -4- This set employs laser. Therefore, be sure to follow carefully the instructions below when servicing. WARNING! W

11、HEN SERVICING, DO NOT APPROACH THE LASER EXIT WITH THE EYE TOO CLOSELY. IN CASE IT IS NECESSARY TO CONFIRM LASER BEAM EMISSION. BE SURE TO OBSERVE FROM A DISTANCE OF MORE THAN 30cm FROM THE SURFACE OF THE OBJECTIVE LENS ON THE OPTICAL PICK-UP BLOCK. Caution: Invisible laser radiation when open and i

12、nterlocks defeated avoid exposure to beam. Advarsel: Usynlig laserstling vedbning, nr sikkerhedsafbrydere er ude af funktion. Undg udsttelse for strling. VAROITUS! Laiteen Kyttminen muulla kuin tss kyttohjeessa mainitulla tavalla saataa altistaa kyt-tjn turvallisuusluokan 1 ylittvlle nkymttmlle lase

13、rsteilylle. VARNING! Om apparaten anvnds p annat stt n vad som specificeras i denna bruksanvising, kan anvndaren utsttas fr osynling laserstrlning, som verskrider grnsen fr laserklass 1. PROTECTION OF EYES FROM LASER BEAM DURING SERVICING CAUTION Use of controls or adjustments or performance of proc

14、e- dures other than those specified herin may result in hazardous radiation exposure. ATTENTION Lutillisation de commandes, rglages ou procdures autres que ceux spcifis peut entraner une dangereuse exposition aux radiations. ADVARSEL Usynlig laserstling ved bning, nr sikkerhedsafbrydereer ude af fun

15、ktion. Undg udsttelse for strling. This Compact Disc player is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT label is located on the rear exterior. CLASS 1LASER PRODUCT KLASSE 1LASER PRODUKT LUOKAN 1LASER LAITE KLASS 1LASER APPARAT Precaution to replace Optical block (BZG-6 YANC)

16、(PXR-104X-BP-0101) Body or clothes electrostatic potential could ruin laser diode in the optical block. Be sure ground body and workbench, and use care the clothes do not touch the diode. 1) After the connection, remove solder shown in right figure. CD PICK-UP Assy PWB Solder -5- NOTE ON BEFORE STAR

17、TING REPAIR -1/2 1. Forced discharge of electrolytic capacitor of power supply block When repair is going to be attempted in the set that uses relay circuit in the power supply block, electric potential is kept charged across the electrolytic capacitors (C101, 102) even though AC power cord is remov

18、ed. If repair is attempted in this condition, secondary defect can occur. In order to prevent the secondary trouble, perform the following measures before starting repair work. Discharge procedure 1Remove the AC power cord. 2Connect a discharging resistor at an end of lead wire that has clips at bot

19、h ends. Connect the other end of the lead wire to metal chassis. 3Contact the other end of the discharging resistor to the positive (+) side (+VH) of C101. (For two seconds) 4Contact the same end of the discharging resistor as step 3 to the negative (-) side (-VH) of C102 in the same way. (For two s

20、econds) 5Check that voltage across C101 and C102 has decreased to 1 V or less using a multimeter or an oscilloscope. Select a discharging resistor referring to the following table. Note: The reference numbers (C101, C102) of the electrolytic capacitors can change depending on the models. Be sure to

21、check the reference numbers of the charging capacitors on schematic diagram before starting the discharging work. 2. Check items before exchanging the MICROCOMPUTER Be sure to check the following items before exchanging the MICROCOMPUTER. Exchange the MICROCOMPUTER after confirming that the MICROCOM

22、PUTER is surely defective. 2-1. Regarding the HOLD terminal of the MICROCOMPUTER When the HOLD terminal (INPUT) of the MICROCOMPUTER is H, the MICROCOMPUTER is judged to be operating correctly. When this terminal is L, the main power cannot be turned on. Therefore, be sure to check the terminal volt

23、age of the HOLD terminal before exchange. When the MICROCOMPUTER is not defective, the HOLD terminal can also go L when the POWER AMPLIFIER has any abnormalities that triggers the abnormality detection circuit on the MAIN C. B. that sets the HOLD terminal to L. Good or no good judgement of the MICRO

24、COMPUTER 1 Turn on the AC main power. 2 Confirm that the main power is turned on and the HOLD terminal of the MICROCOMPUTER keeps the H level or not. 3 When the HOLD terminal is L level, the abnormality detection circuit is judged to be working correctly and the MICRO COMPUTER is judged to be good.

25、Fig-1 MAIN C.B D101 C101C102 34 22 Charging voltage (V)Discharging Rated power (W)Parts number (C101, 102)resistor ( ) 25-48100387-A00-247-090 49-140220587-A00-232-090 -6- In such a case, check also if the POWER AMPLIFIER circuit or power supply circuit has any abnormalities or not. 2-2. Regarding r

26、eset There are cases that the machine does not work correctly because the MICROCOMPUTER is not reset even though the AC power cord is re-inserted, or the software reset (pressing the STOP key + POWER key) is performed. When the above described phenomenon occurs, it can lead to wrong judgement as if

27、the MICROCOMPUTER is defective and to exchange the MICROCOMPUTER. In such a case, perform the forced-reset by the following procedure and check good or no good of the MICROCOM PUTER. 1 Remove the AC power cord. 2 Short both ends of the electrolytic capacitor C113 that is connected to VDD of the MICR

28、OCOMPUTER with tweezers. 3 Connect the AC power cord again. If the MICROCOMPUTER returns to the normal operation, the MICROCOMPUTER is good. Note: The reference number or MICROCOMPUTER pin number of transistor (Q110) and electrolytic capacitor (C113) can change depending on the models. Be sure to ch

29、eck the reference numbers on schematic diagram before starting the discharging work. 2-3. Confirmation of soldering state of MICROCOMPUTER Check the soldering state of the MICROCOMPUTER in addition to the above described procedures. Be sure to exchange the MICROCOMPUTER after surely confirming that

30、the trouble is not caused by poor soldering but the MICROCOMPUTER itself. NOTE ON BEFORE STARTING REPAIR -2/2 Fig-2-2 MICRO- COMPUTER MICROCOMPUTER FRONT C.B FRONT C.B VSS VDD C113 16 15 C113 18 15 Short with tweezers. != ! SAFTY PARTS C= Components marked All components used on this model at the pr

31、oduction line are shown in this service manual. However, please note that not all components will be available as spare parts for after-sales service. Components marked S and O are designated as spare parts for service and will be stocked at the spare parts centers. Components marked X and R are not

32、 designated as spare parts for after sales service, and will not be stocked at the spare parts centers. UNIT-NAME ! C REF-NO PARTS-NO PARTS-NAME SUFFIX carrier of 999 kHz with 30% modulation, and source at 1 kHz, position output at maximum. 2) Tune the receiving frequency of the unit at MW 999 kHz.

33、3) While monitoring the waveform at 1 kHz through the oscilloscope, lower the output level of S.S.G. maximum (till a certain degree of noise is monitored). 4) Adjust L802 so that the millivoltmeter points maximum. 6. Tracking Adjustment (MW) Requirements: As instructed in preparations. Adjustment po

34、int: L952 / L953 1) Set S.S.G. to MW; carrier of 999 kHz with 30% modulation, and source at 1 kHz, position output at maximum. 2) Tune the receiving frequency of the unit at MW 999 kHz. 3) While monitoring the waveform at 1kHz through the oscilloscope, lower the output level of S.S.G. maximum (till

35、a certain degree of noise is monitored). 4) Adjust L952 so that the millivoltmeter points maximum. 5) Set S.S.G. to MW; carrier of 603 kHz with 30% modulation, and source at 1 kHz. 6) Tune the receiving frequency of the unit at MW 603 kHz. 7) Adjust L953 so that the millivoltmeter points maximum. 8)

36、 Repeat above steps 1) to 7) 2 to 3 times. 7. Tracking Adjustment(LW) Requirements: As instructed in preparations. Adjustment point: L941/TC942 1) Set S.S.G. to LW; carrier of 144 kHz with 30% modulation, and source at 1 kHz, position output at maximum. 2) Tune the receiving frequency of the unit at

37、 LW144 kHz. 3) While monitoring the waveform at 1kHz through the oscilloscope, lower the output level of S.S.G. maximum (till a certain degree of noise is monitored). 4) Adjust L941 so that the millivoltmeter points maximum. 5) Set S.S.G. to LW; carrier of 290 kHz with 30% modulation, and source at

38、1 kHz. 6) Tune the receiving frequency of the unit at LW 290 kHz. 7) Adjust TC942 so that the millivoltmeter points maximum. 8) Repeat above steps 1) to 7) 2 to 3 times. 8. Auto-Stop Check (MW) Requirements: As instructed in preparations. 1) Set S.S.G. to MW; carrier of 999 kHz with 30% modulation, source at 1 kHz, and output of 40 to 65 dBuV. 2) Apply the tuning search function, and check that the unit automatically stops at MW 999 kHz. -34- ELECTRICAL ADJUSTMENT -4/7 Make the following preparations for FM adjustment. Preparations S