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7 . 4
7 . 4
OVP
OVP
: If +5V goes up too much, the induced voltage on pin 4 of T802 becomes lar
: If +5V goes up too much, the induced voltage on pin 4 of T802 becomes lar
7 . 4
OVP
: If +5V goes up too much, the induced voltage on pin 4 of T802 becomes lar
7 . 4
7 . 4
OVP
OVP
: If +5V goes up too much, the induced voltage on pin 4 of T802 becomes lar
: If +5V goes up too much, the induced voltage on pin 4 of T802 becomes lar
o v e r 2 2 v o l t s , Z D 8 0 3 c o n d u c t s , Q 8 0 6 i s t r i g g e r e d o n , p i n 1 o f I 8 0 1 i s p u l l e d d o w n t o g r o u n d , t h e p u l s e t r a i n
o v e r 2 2 v o l t s , Z D 8 0 3 c o n d u c t s , Q 8 0 6 i s t r i g g e r e d o n , p i n 1 o f I 8 0 1 i s p u l l e d d o w n t o g r o u n d , t h e p u l s e t r a i n
o v e r 2 2 v o l t s , Z D 8 0 3 c o n d u c t s , Q 8 0 6 i s t r i g g e r e d o n , p i n 1 o f I 8 0 1 i s p u l l e d d o w n t o g r o u n d , t h e p u l s e t r a i n
o v e r 2 2 v o l t s , Z D 8 0 3 c o n d u c t s , Q 8 0 6 i s t r i g g e r e d o n , p i n 1 o f I 8 0 1 i s p u l l e d d o w n t o g r o u n d , t h e p u l s e t r a i n
o v e r 2 2 v o l t s , Z D 8 0 3 c o n d u c t s , Q 8 0 6 i s t r i g g e r e d o n , p i n 1 o f I 8 0 1 i s p u l l e d d o w n t o g r o u n d , t h e p u l s e t r a i n
a t p i n 6 g o e s down to zero , shutting Q803 o f
a t p i n 6 g o e s do wn to zero, shuttin g Q803 o f
a t p i n 6 g o e s down to zero, shutting Q8 03 o f
a t p i n 6 g o e s down to zero , shutting Q803 o f
a t p i n 6 g o e s do wn to zero, shuttin g Q803 o f
7 . 5
7 . 5
SCP
SCP
7 . 5
SCP
: I f o u t p u t t e r m i n a l i s s h o r t t o g r o u n d , p h o t o t r a n s i s t o r d o e s n o t c o n d u c t , h e n c e Q 8 0 5 d o e s n o t c o n d u c t
: I f o u t p u t t e r m i n a l i s s h o r t t o g r o u n d , p h o t o t r a n s i s t o r d o e s n o t c o n d u c t , h e n c e Q 8 0 5 d o e s n o t c o n d u c t
7 . 5
7 . 5
SCP
SCP
: I f o u t p u t t e r m i n a l i s s h o r t t o g r o u n d , p h o t o t r a n s i s t o r d o e s n o t c o n d u c t , h e n c e Q 8 0 5 d o e s n o t c o n d u c t
: I f o u t p u t t e r m i n a l i s s h o r t t o g r o u n d , p h o t o t r a n s i s t o r d o e s n o t c o n d u c t , h e n c e Q 8 0 5 d o e s n o t c o n d u c t
: I f o u t p u t t e r m i n a l i s s h o r t t o g r o u n d , p h o t o t r a n s i s t o r d o e s n o t c o n d u c t , h e n c e Q 8 0 5 d o e s n o t c o n d u c t
n e i t h e r
n e i t h e r
. T h e r e f e r e n c e v o l t a g e + 5 V a t p i n 8 b e g i n s t o c h a r
. T h e r e f e r e n c e v o l t a g e + 5 V a t p i n 8 b e g i n s t o c h a r
n e i t h e r
. T h e r e f e r e n c e v o l t a g e + 5 V a t p i n 8 b e g i n s t o c h a r
n e i t h e r
n e i t h e r
. T h e r e f e r e n c e v o l t a g e + 5 V a t p i n 8 b e g i n s t o c h a r
. T h e r e f e r e n c e v o l t a g e + 5 V a t p i n 8 b e g i n s t o c h a r
pin 1 down to ground, shutting Q803 of
pin 1 down to ground, shutting Q803 of
pin 1 down to ground, shutting Q803 of
pin 1 down to ground, shutting Q803 of
pin 1 down to ground, shutting Q803 of
3. On-screen circuit (Circuit diagrams Main PWB 3/6)
f completely
f completely
f completely
f completely
f completely
f completely
f completely
f completely
f completely
f completely
LCD 1550M Power Board Block Diagram
. . . .
.
ge on C829 and activates Q806 to conduct, pulling
ge on C829 and activates Q806 to conduct, pulling
ge on C829 and activates Q806 to conduct, pulling
ge on C829 and activates Q806 to conduct, pulling
ge on C829 and activates Q806 to conduct, pulling
. . . .
.
NEC-FA150ATUA
g e a l s o . S u p p o s e t h a t i t i s
g e a l s o . S u p p o s e t h a t i t i s
g e a l s o . S u p p o s e t h a t i t i s
g e a l s o . S u p p o s e t h a t i t i s
g e a l s o . S u p p o s e t h a t i t i s
Circuit Description
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