Zenith DVT654, Service Manual

Page: 33 / 87

- 2-27 -
2. SMPS BLOCK DIAGRAM
GND
P-con
TO AMP (PSW01)
TO I/O (PSV01)
5.3V
A
GND
33VA
13VA
GND
3.8VA
-29VA
P-sen
!
35.5V
FL+
GND
FL-
FUSE (F901
)
NOISE FILTER
BLO
C
K
(CM901,L902
,
L901, CM902
)
RESET BLO
C
K
(D905,D906
)
DRIVE & S/W BLOC
K
(IC902,R919,
C916, C917,C918,
C919,ZD912
)
BD901
TH901
Y-CAP C901,C902
Y-CAP C900
+
BR BL
(BK)(WH)
C903,C904
!
!
!
!
SNUBBER
BLO
C
K
(D901,C905,R901
)
DRIVE & S/W BLOC
K
(IC901, D902, D903,
C909,C910,R906,
ZD901,ZD902
)
T901
T902
!
!
PHOTO COUPLE
R
(PC910
)
ERROR AMP
(IC941)
FEED-BACK
BLO
C
K
(R930,R931
,
R926,R927, R928,C930
)
!
RECTIFIER &
SMOOTING BLOC
K
(D921,C921,L921
C925
)
RECTIFIER &
SMOOTING BLOC
K
(D927,C931,L925,C932
)
RECTIFIER &
SMOOTING BLOC
K
(D91,C951,C952)
RECTIFIER &
SMOOTING BLOC
K
(R951,R952
)
PHOTO COUPLE
R
(PC912
)
ERROR AMP
(IC942)
FEED-BACK
BLO
C
K
(R946,R947
,
R949,R950, R955,C943
)
!
RECTIFIER &
SMOOTING BLOC
K
(D923,C923,L923
)
RECTIFIER &
SMOOTING BLOC
K
(D922,C922,L922,C926
)
RECTIFIER &
SMOOTING BLOC
K
(D925,C929,)
12V REG
& S/W Block
(IC953,R947,C928
)
33V S/W Block
(Q923,R943,R934
)
TIMER
‘H
’
Block
(Q925,R956,R957
)
PWR CTL Block
(Q926,R964,R965
)
12VT
REG
& S/W Bloc
k
(IC956,R950,C953
)
5.0VT S/W Block
(Q920,R942,R944
R945,C920
)
RE
GULATION B
L
OC
K
(L951,C953,C954
)
5.0VD S/W Block
(Q924,R940,R935,R936
D934,C934
)
1
5
4
7
2
1
5
4
3 2
3 8
NOTES) Warning
NOTES) Parts that are shaded are critical
NOTES) With respect to risk of fire or
NOTES) electricial shock.