Zenith XBS344 Series, Service Manual

Page: 30 / 159

3-18 3-19
BLOCK DIAGRAMS
1. POWER(SMPS) BLOCK DIAGRAM 1
BD101
BD101
PW101
BR
(BK)
BL
(WH)
V101
F101
!
!
IC105
F102
IC106
!
IC102
T102
IC103
!
!
T101 !
C103
5.0V REG
BLOCK
( IC152, C172 )
C113 C114
C122
! !
!
!
PSW01
32VA
5VA
12VA
PWR SENSE
PSV01
FD(+)
FD(-)
-29VA
33VA
13VA
3.8VA
5.3VA
LINE FILTER
BLOCK
( C101, C102,
L101, L102 )
RECTIFIER & SMOOTHING
BLOCK
( D129, C144, L124, C147 )
FEED-BACK
BLOCK
( R132, R133, C148,
R134, R135, R136,
R137 )
RECTIFIER &
SMOOTHING
BLOCK
(D123, C130, ZD121, R127)
RECTIFIER & SMOOTHING
BLOCK
( D126, C140, L122, C141 )
RECTIFIER &
SMOOTHING
BLOCK
( D125, R129, C138 )
FEED-BACK
BLOCK
( R122, R121, C136,
R123, R124, R125,
R126 )
12V REG
BLOCK
( IC153, C139 )
PWR SENSE
BLOCK
( R184, R185 )
RECTIFIER & SMOOTHING
BLOCK
( D124, C137, R128 )
DRIVE & S/W BLOCK
QUASI-RESONANT BLOCK
( IC101, R114, R115, C123, C107,
BC101, D108, R101, D102, R102,
D103, R106, ZD102, Z101, C108,
R104, C109, C110)
RECTIFER & SMOOTHING
BLOCK
( D122, C131, R131,
C132, C133, C135, L122 )
SNUBBER
BLOCK
( R110, C115,
D104, C117 )
DRIVE & S/W BLOCK
SOFT-START BLOCK
( R107, R108, C121, R105,
C120, C119, ZD1103, D105,
R111, BC102 )
RECTIFIER & SMOOTHING
BLOCK
( D127, C142, L123, C146 )
DT-65780M's