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1. Audio circuit (Circuit diagrams Main PWB) KT
2. Power supply (Circuit daigrams MAIN PWB)
7 . 1
7 . 1
S t a r t
S t a r t
: When power is turned on, Q801 conducts due to bias from C805 and R803. Q801 supplies a 17 volt
: When power is turned on, Q801 conducts due to bias from C805 and R803. Q801 supplies a 17 volt
7 . 1
S t a r t
: When power is turned on, Q801 conducts due to bias from C805 and R803. Q801 supplies a 17 volt
7 . 1
7 . 1
S t a r t
S t a r t
: When power is turned on, Q801 conducts due to bias from C805 and R803. Q801 supplies a 17 volt
: When power is turned on, Q801 conducts due to bias from C805 and R803. Q801 supplies a 17 volt
a n d a s t a r t i n g c u r r e n t a b o u t 0 . 3 m A t o p i n 7 o f I 8 0 1 . I 8 0 1 s t a r t s t o o s c i l l a t e ( R 8 1 6 , C 8 1 3 ) a n d o u t p u t s a p u l s e
a n d a s t a r t i n g c u r r e n t a b o u t 0 . 3 m A t o p i n 7 o f I 8 0 1 . I 8 0 1 s t a r t s t o o s c i l l a t e ( R 8 1 6 , C 8 1 3 ) a n d o u t p u t s a p u l s e
a n d a s t a r t i n g c u r r e n t a b o u t 0 . 3 m A t o p i n 7 o f I 8 0 1 . I 8 0 1 s t a r t s t o o s c i l l a t e ( R 8 1 6 , C 8 1 3 ) a n d o u t p u t s a p u l s e
a n d a s t a r t i n g c u r r e n t a b o u t 0 . 3 m A t o p i n 7 o f I 8 0 1 . I 8 0 1 s t a r t s t o o s c i l l a t e ( R 8 1 6 , C 8 1 3 ) a n d o u t p u t s a p u l s e
a n d a s t a r t i n g c u r r e n t a b o u t 0 . 3 m A t o p i n 7 o f I 8 0 1 . I 8 0 1 s t a r t s t o o s c i l l a t e ( R 8 1 6 , C 8 1 3 ) a n d o u t p u t s a p u l s e
t r a i n t h r o u g h p i n 6 t o d r i v e Q 8 0 3 .
t r a i n t h r o u g h p i n 6 t o d r i v e Q 8 0 3 .
t r a i n t h r o u g h p i n 6 t o d r i v e Q 8 0 3 .
t r a i n t h r o u g h p i n 6 t o d r i v e Q 8 0 3 .
t r a i n t h r o u g h p i n 6 t o d r i v e Q 8 0 3 .
7 . 2
7 . 2
OPP
OPP
: W h en Q803 turns on, C805 supplie s a li n ea rl y in cr ea si ng t ri an gl e cu rr en t th ro ug h th e pr im ar y in d uc -
: W hen Q803 turns on, C805 supplie s a li ne ar ly i nc re as i ng tr i an gl e cu rr en t th ro ug h th e pr im ar y in du c-
7 . 2
7 . 2
7 . 2
OPP
OPP
OPP
: W h en Q803 turns on, C805 supplie s a li ne ar ly i nc re as in g tr ia ng le c ur re nt t hr ou gh t he p ri ma ry i nd uc -
: W h en Q803 turns on, C805 supplie s a li n ea rl y in cr ea si ng t ri an gl e cu rr en t th ro ug h th e pr im ar y in d uc -
: W hen Q803 turns on, C805 supplie s a li ne ar ly i nc re as i ng tr i an gl e cu rr en t th ro ug h th e pr im ar y in du c-
t a n c e o f T 8 0 2 t o t h e d r i v e r Q 8 0 3 , o n c e t h e p e a k v a l u e o f t h i s c u r r e n t m u l t i p l i e d b y R 8 1
t a n c e o f T 8 0 2 t o t h e d r i v e r Q 8 0 3 , o n c e t h e p e a k v a l u e o f t h i s c u r r e n t m u l t i p l i e d b y R 8 1
t a n c e o f T 8 0 2 t o t h e d r i v e r Q 8 0 3 , o n c e t h e p e a k v a l u e o f t h i s c u r r e n t m u l t i p l i e d b y R 8 1
t a n c e o f T 8 0 2 t o t h e d r i v e r Q 8 0 3 , o n c e t h e p e a k v a l u e o f t h i s c u r r e n t m u l t i p l i e d b y R 8 1
t a n c e o f T 8 0 2 t o t h e d r i v e r Q 8 0 3 , o n c e t h e p e a k v a l u e o f t h i s c u r r e n t m u l t i p l i e d b y R 8 1
train will be shut down immediately to protect Q803, T802 from being burned out.
train will be shut down immediately to protect Q803, T802 from being burned out.
train will be shut down immediately to protect Q803, T802 from being burned out.
train will be shut down immediately to protect Q803, T802 from being burned out.
train will be shut down immediately to protect Q803, T802 from being burned out.
7 . 3
7 . 3
Regulation
Regulation
7 . 3
Regulation
: I f o u t p u t v o l t a g e + 5 V g o e s u p , t h e R t e r m i n a l o f I 8 0 3 g e t s m o r e b i a s , a c c o r d i n g l y p h o t o t r a n s i s -
: I f o u t p u t v o l t a g e + 5 V g o e s u p , t h e R t e r m i n a l o f I 8 0 3 g e t s m o r e b i a s , a c c o r d i n g l y p h o t o t r a n s i s -
7 . 3
7 . 3
Regulation
Regulation
: I f o u t p u t v o l t a g e + 5 V g o e s u p , t h e R t e r m i n a l o f I 8 0 3 g e t s m o r e b i a s , a c c o r d i n g l y p h o t o t r a n s i s -
: I f o u t p u t v o l t a g e + 5 V g o e s u p , t h e R t e r m i n a l o f I 8 0 3 g e t s m o r e b i a s , a c c o r d i n g l y p h o t o t r a n s i s -
: I f o u t p u t v o l t a g e + 5 V g o e s u p , t h e R t e r m i n a l o f I 8 0 3 g e t s m o r e b i a s , a c c o r d i n g l y p h o t o t r a n s i s -
t o r a n d p h o t o d i o d e f l o w s m o r e c u r r e n t . T h e v o l t a g e o f p i n 2 g o e s u p t o o , m a k i n g t h e p u l s e w i d t h o f p i n 6 t o
t o r a n d p h o t o d i o d e f l o w s m o r e c u r r e n t . T h e v o l t a g e o f p i n 2 g o e s u p t o o , m a k i n g t h e p u l s e w i d t h o f p i n 6 t o
t o r a n d p h o t o d i o d e f l o w s m o r e c u r r e n t . T h e v o l t a g e o f p i n 2 g o e s u p t o o , m a k i n g t h e p u l s e w i d t h o f p i n 6 t o
t o r a n d p h o t o d i o d e f l o w s m o r e c u r r e n t . T h e v o l t a g e o f p i n 2 g o e s u p t o o , m a k i n g t h e p u l s e w i d t h o f p i n 6 t o
t o r a n d p h o t o d i o d e f l o w s m o r e c u r r e n t . T h e v o l t a g e o f p i n 2 g o e s u p t o o , m a k i n g t h e p u l s e w i d t h o f p i n 6 t o
become narrower. So the output voltage +5V will be pulled down to a stable value.
become narrower. So the output voltage +5V will be pulled down to a stable value.
become narrower. So the output voltage +5V will be pulled down to a stable value.
become narrower. So the output voltage +5V will be pulled down to a stable value.
become narrower. So the output voltage +5V will be pulled down to a stable value.
Circuit Description
NEC-FA150ATUA
1 e x c e e d s 1 v o l t , p u l s e
1 e x c e e d s 1 v o l t , p u l s e
1 e x c e e d s 1 v o l t , p u l s e
1 e x c e e d s 1 v o l t , p u l s e
1 e x c e e d s 1 v o l t , p u l s e
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