Epson SEIJ98006 manual 10. C265 PSB/PSE Board Circuit Block Diagram

EPSON Stylus Color 900 Revision C

I n c o m in g c u r r e n t p r o t e c t io n

S m o o t h in g

H ig h e r h a r m o n ic s a b s o r p t io n

L	F 1
	R 1		L 1 C 3 ,	C42 D B 1C
	C 1
N T H 1 ,		T H

		F u ll w a v e r e c t if ic a t io n
I n r u s h c u r r e n t t e m p e r a t u r e						c o n v e r s io n
						H ig h e r h a r m o n ic s a b s o
						S m o o t h in g
	T 1	+ 5 V RLe5g1u la t o r
			1	t			G L
				7
R 2 8					+		+ 5 V / 1 . 5 A
		n		u
3 0 0 K		I		L 4 9 6 0			+ 5
				O			P S C
S t a r t in g r e s is t o r				( I C 5 1 )C 5 4
M a in		S					+ 5
			5				+ 5
S w it c h in g		O					G L
Q 1 C 1 3				S m o o t h in g5 V				lin e	o v e r v o lt a
		D 5 1					G P
F e e d
							+ 4 2 V / 0 . 8 A
Q 2	b a c k				Z D 5 3
							+ 4 2
Q 3			C 5 1 , 5 2				+ 4 2
							+ 4 2
Q 3 1				Z D 5 1Z D 5 2			G P
F e e d				Z D 8 7
				Z D 8 1		6
b a c k

P C 1

C 8 4

+

C o m e s o n w h e n a b n o r m a l .
P h o t o C o u p le r	Q 8 4

4 2 V	lin e c o n s t a n t v o lt a g e c o n t r o l
	V o lt a g e d r o p d e la y c ir c u it
4 2	V lin e o v e r v o lt a g e p r o t e c t io n

Figure 2-10. C265 PSB/PSE Board Circuit Block Diagram

Operating Principles Electrical Circuit Operation Principles 58