Sharp MZ-80SFD Service Manual page 15

!
POWER
supplv
SEcnON
Block Diagram of Power Supply Section
v
v
.---
..---
..
+12
Gl
~
E
Rectifying and
Transistor
'-'
..
..
AC
Gl ~
Chopping
~
Smoothing
INPUT
LL
I - -
c
Circuit
Circuit
. .
t - -
'-F
. .
...
"--
:......-
Control
Circuit
1
G
~
...-<>
Transistor
+5
'"'-
Rectifying and
Chopping
Somoothing
Circuit
' - - -
Circuit
~
Control
Circuit
1
Waveform of Each
Part
Waveform of pin@ of IC201
and pin
(5)
of IC301.
Waveform of pin
([j)
of IC201.
Q202 collector waveform.
I
22V
/-22~s-i
40~s~
22V
24~s
4(j~s
Waveform of pin
([j)
of IC301.
0302 collector waveform.
15V
15~s
40~s
-13-