Aiwa-NSXHMT75-cs-sm 电路图 维修手册.pdf
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1、SERVICE MANUAL DATA NSXHMT75 SYSTEM CD CASSEIVER REMOTE CONTROLLER CXNHMT75 COMPACT DISC/ STEREO CASSETTE RECEIVER BASIC TAPE MECHANISM : 2ZM-3 MK2 PR4NM BASIC CD MECHANISM : AZG-1 ZD3RDM NSX-HMT75U S/M Code No. 09-003-425-9R1 REVISION This Service Manual is the Revision Publishing and replaces Simp
2、le Manual (S/M Code No. 09-003-425-9T1). If requiring information about the CD mechanism, see Service Manual of AZG-1, (S/M Code No. 09-001-335-3N8). SPEAKER SXNAJ72 SX-R275 SX-C605 RCZAS05 RadioFans.CN 收音机爱 好者资料库 2 SPECIFICATIONS REF. NOPART NO.KANRIDESCRIPTION NO. ACCESSORIES LIST 1 8A-NFU-903-010
3、 IB,U(ESF)M 2 8Z-NFV-702-010 RC UNIT,RC-ZAS05 3 87-006-225-010 ANT,LOOP ANT NC2 4 87-043-115-010 FEEDER-ANT,FM Design and specifications are subject to change without notice. Dolby noise reduction manufactured under license from Dolby Labo- ratories Licensing Corporation. “DOLBY”, and the double-D s
4、ymbol are trademarks of Dolby Laboratories Licensing Corporation. The word “BBE” and the “BBE symbol” are trademarks of BBE Sound, Inc. Under license from BBE Sound, Inc. RadioFans.CN 收音机爱 好者资料库 3 PROTECTION OF EYES FROM LASER BEAM DURING SERVICING VAROITUS! Laiteen Kyttminen muulla kuin tss kyttohj
5、eessa mainit- ulla tavalla saattaa altistaa kyt-tjn turvallisuusluokan 1 ylit- tvlle nkymttmlle lasersteilylle. 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. Caution: Invi
6、sible laser radiation when open and interlocks defeated avoid expo- sure to beam. Advarsel:Usynling laserstling ved bning, nr sikkerhedsafbrydere er ude af funktion. Undg udsttelse for strling. CAUTION Use of controls or adjustments or performance of procedures other than those specified herein may
7、result in hazardous radiation exposure. ATTENTION Lutilisation 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 funktion. Undg udsttelse for strling. This Compac
8、t Disc player is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT label is located on the rear exterior. This set employs laser. Therefore, be sure to follow carefully the instructions below when servicing. WARNING! WHEN SERVICING, DO NOT APPROACH THE LASER EXIT WITH THE EYE TOO CLOS
9、ELY. 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. CLASS 1 KLASSE 1 LUOKAN 1 KLASS 1 LASER PRODUCT LASER PRODUKT LASER LAITE LASER APPARAT Precaution to replace Optical
10、 block (KSS-213F) 1) After the connection, remove solder shown in the right figure. 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. RadioFans.CN 收音机爱 好者资料库 4 NOTE ON BEFORE STARTI
11、NG REPAIR Charging voltage (V)Discharging Rated power (W)Parts number (C101, 102)resistor () 25-48100387-A00-247-090 49-140220587-A00-232-090 Note: The reference numbers (C101, C102) of the electrolytic capacitors can change depending on the models. Be sure to check the reference numbers of the char
12、ging 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 MICROCOMPUTER is surely defective. 2-1. Regardi
13、ng 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 voltage of the HOLD terminal before exc
14、hange. 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 MICROCOMPUTER 1Turn on the AC main p
15、ower. 2Confirm that the main power is turned on and the HOLD terminal of the MICROCOMPUTER keeps the “H” level or not. 3When the HOLD terminal is “L” level, the abnormality detection circuit is judged to be working correctly and the MICROCOMPUTER is judged to be good. 1. Forced discharge of electrol
16、ytic 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 removed. If repair is attempted in this condition, se
17、condary 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 both ends. Connect the other end of the lead wire t
18、o 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 seconds) 5Check that voltage across C101 and C102
19、 has decreased to 1 V or less using a multimeter or an oscilloscope. Select a discharging resistor referring to the following table. MAIN C.B D101 C101C102 34 22 5 In such a case, check also if the POWER AMPLIFIER circuit or power supply circuit has any abnormalities or not. 2-2. Regarding reset The
20、re 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 the MICR
21、OCOMPUTER 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 MICROCOMPUTER. 1 Remove the AC power cord. 2Short both ends of the electrolytic capacitor C113 that is connected to VDD of the MICROCOMPUTER
22、with tweezers. 3Connect 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 check the ref
23、erence 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 the trouble
24、 is not caused by poor soldering but the MICROCOMPUTER itself. Fig-2-2 MICRO- COMPUTER MICROCOMPUTER FRONT C.B FRONT C.B VSS VDD C113 18 15 C113 18 15 Short with tweezers. 6 REF. NOPART NO.KANRIDESCRIPTION NO. REF. NOPART NO.KANRIDESCRIPTION NO. ELECTRICAL MAIN PARTS LIST IC 87-020-454-010IC,DN6851
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