Sharp AR-121E Service Manual page 121

AL-1000/1010
(9) Power circuit block diagram
Block diagram
The power circuit is composed of the main section, the high voltage circuit, the FW signal section, and the heater lamp drive circuit.
The main section directly rectifies the AC power current and switch-converts with the DC/DC convertor, and rectifies again and
smoothes to form each DC power.
In the high voltage circuit section, the 24V output of the main section is switch-converted by the DC/DC convertor and rectified and
smoothed to form the high voltage output.
The FW signal section fullwave-rectifies the AC power to supply signal output at the timing of 0V.
ACin
Noise filter
Main section
High voltage
section
FW control section
Heater lamp drive
circuit section
Heater lamp output
Rectifying/ Invertor
smoothing circuit
Full-wave
rectifying
Rectifying/
Transformer
T1 smoothing
Rectifying/
smoothing
Rectifying/
smoothing
Control
PC1
Invertor
Invertor
PC3
PC2
RY1
12-17
Series
3.3V
regulator
Series
5V
regulator
Series
12V
regulator
24V
MC
High voltage
MC
transformer
T101
MC IN
Series
DV BIAS
regulator BIAS
GRID
Series
regulator
GRID L
TC
High voltage
TC
transformer
T102
Dividing
BC
circuit
TC IN
FW
HL
/PR