Akai-CD17-cd-adj 电路图 维修手册.pdf

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1、2-8. OPERATIONAL AMPLIFIER COMPARATOR N J M 2 0 6 8 S T A 7 5 3 9 3 S / Bp1 LiJl2j3j 4 j l 5 j l 6 j 7j a 9 2-9. 2KS-RAM T C - 5 5 1 7 A 7 A 6 A 5 A 4 A 3 A 2 A 1 A O 1/0! 1/021 l/03( GND5 )6 (7 8 19 )I0 )ll 12 2 4 VDD 2 3 0 A 8 2 2 n A 9 21 OR/W 20ODE 1 9 0 AIO I 8( 17 CE M/OB I 6 0 1 / 0 7 5 0 1/0

2、6 I 4 Q I / 0 5 13 O 1/04 - 15 - RadioFans.CN 收音机爱 好者资料库 SECTION 3 ADJUSTMENT PROCEDURES B E S U R E T O F O L L O W C A R E F U L L Y T H E I N S T R U C T I O N B E L O W B E F O R E S E R V I C I N G A N D A D J U S T M E N T . - S A F E T Y I N T E R L O O K - T h e c o m p a c t disc p l a y e

3、r reads t h e disc signal b y d e t e c t i n g t h e laser b e a m . It m u s t be a v o i d e d f o r the h u m a n b o d y t o be e x p o s e d t o t h e laser b e a m . Especially t h e h u m a n eyes c a n be b a d l y a f f e c t e d b y t h e laser b e a m . T h e r e f o r e , t h e u n i t

4、is e q u i p - ped t o p r e v e n t t h e unnecessary laser p u t p u t . T h e laser b e a m o u t p u t s are c o n t r o l l e d b y the p i n 4 2 o f 1 0 3 0 0 1 (one c h i p m i c r o c o m p u t e r ) . W h e n t h e p i n 4 2 is. L o w , t h e laser d i o d e e m i t s t h e laser b e a m .

5、O n t h e c o n t r a r y , w h e n t h e p i n 4 2 is H I G H , t h e laser d i o d e does n o t e m i t t h e b e a m . A f t e r t h e u n i t is p o w e r e d , t h e u n i t i a l state o f p i n 4 2 is H I G H . T h e laser d i o d e e m i t s t h e b e a m w h e n t h e f o l l o w i n g c o

6、n d i t i o n s are m e t . 1) T h e Disc t r a y is p e r f e c t l y closed ( T h e leaf s w i t c h o f t h e close sensor is s h o r t ) . 2) T h e o p t i c a l p i e k u p is l o c a t e d at t h e v i c i n i t y o f t h e disc d r i v i n g m o t o r ( T h e leaf s w i t c h o f t h e p i c

7、k - u p slide l i m i t e ( P U S L ) sensor is s h o r t ) . it t h e disc is n o t f o u n d , it d o e s n o t e m i t t h e laser b e a m . B u t if t h e D I S O is l o a d e d in t h e set, t h e set reads the d i r e c t o r y o f t h e disc w i t h laser b e a m . W h e n P L A Y k e y is pr

8、essed, t h e laserdiode e m i t s t h e b e a m again. OPEN -vW- +5V -i- LOW : ACTIVE o ) R307 12 K -O TER(YMS8I5I7) R327 820K W O KPf(YM3ei522) C305 473 R3CI9 ICXlA) Hl 1 , R3I0 2.2(1/4) TRACKING ACTUATOR R329 220K R3I4 4.7K W -AAT O.TRGL( YM381520) R3I3 47K -O TRHD (YM3BI5*2I) 777 R328 220K (-IIV) R330 220K W | - R3I5 10 K W -O TR0FYM38I5 419) (TRACKING SERVO CIRCUIT) Y ; Distance between center of a track and center of a optical beam. - 23 - SECTION 5 DIAGRAM PCB PATTERN & MARKING . MAIN - 24 -