Zenith XBV 443, Service Manual

Page: 29 / 108

3-20 3-21
BLOCK DIAGRAMS
1. POWER(SMPS) BLOCK DIAGRAM
BD101
T101
TRANS
R101
+
BR BL
(BK)(WH)
C103
!
!
!
!
!
!
FUSE
(F101)
NOISE FILTER
BLOCK
(C101,L102,
C102)
PHOTO COUPLER
(IC102)
ERROR
AMP
(IC103)
SNUBBER
BLOCK
(D101,C105
C106,R104)
DRIVE & S/W BLOCK
(IC101, D102, R105,
C104, C109 , C135)
Y-CAP
C111
Y-CAP
C110
FEED-BACK
BLOCK
R112,R113,
C133,R114.
R115,R116
R117)
RECTIFIER &
SMOOTING BLOCK
(D110,C123,C163,
R133,L122,C126)
RECTIFIER &
SMOOTING BLOCK
(D118,D112,C129,
C131,L124,L125)
RECTIFIER &
SMOOTING BLOCK
(D111,C127,L123,
C128)
RECTIFIER &
SMOOTING BLOCK
(D113,C132,R119)
CAP VCC
D115
D117
DRUM VCC
12V
8V
5.3VA
5V
3.3V
33V
12V REG BLOCK
(Q156,ZD103,C151,
R150,R153,C152)
8V REG BLOCK
(D114,IC151,R170,
C154,C159)
5V S/W BLOCK
(Q160,C155,D121,
R157,R158,R159,R160)
3.3V REG BLOCK
(IC152,C153,R156)
33V S/W BLOCK
(Q161,R154,R155,
R177)
5V S/W BLOCK
(Q163,C162,R173,
Q164)
PWR CTL'H'
SW5V
9V
9V REG BLOCK
(Q165,ZD171,C171,
R174,R175,R176)
PWR CTL BLOCK
(Q162,C161,R164,
R163)
6
5
7 8
2
3 1
DVW-7000