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Hitachi MB-6890 Service Manual page 80

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6-10
Power
The
power
single
of
3
chopping
down
-SV/-12V
are
output
are
of
In
case
6-48
shows
Fig
+5V
6-10-2
AclOOV
input
the
noise
Regulator
+5V
regulator
switching
activated
is
Ql
regulated
coil
Tl0O.
my
susan:
k
All manuals and user guides at all-guides.com
Unit
Block
insulated
unit
in
is
the
use
ON-OFF
generating
forward
2nd
the
output,
3
gained
by
using
(i.e.
+5V,
+12V,
gained
the
supplement
power
on,
the
block
diagram
circuit
regulator
the
regulator
enters
leak
AC
to
to
power
circuit
bridge
regulatesthe
forward
uses
Single
Transistor
Ql.
transformer
by
pulse
D100
then
DC
by
output
'
.
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ilter
p
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945
Fig.
Power
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.
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'
regulator
Switching
circuit.
5V
f
voltage
+l2V
output
terminal
regulator
-l2V).
-5V,
is
output
power
unit.
Each
of
power
circuit
through
line
such
by
as
power
AClOOV
by
DI
method
which
uses
T3._2nd
pulse
be
obtained
to
can
i n v e r
ecti
h
as
ircui
§ § § § ‹
a.
E ve
rec
circui
rectii
over
choppe
circu
curre
O
e i
circui
control
Maavss
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circu
curre
2
currer
-ro
ee-
ro
I
circ
contro
»
nt
ectif
o
r
.
ircui
circuii
Unit
Diagram
Block
v
C
0
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----
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I
.
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1
nu
mov
-.-.~
-*Time
I6-49
supply
power
is
obtained.
output
is
obtained.
Further,
circuit,
totally
dropper
in
use.
circuit
is
explained
which
the
filter
unit.
y
Cl.
then
charge!
transformer
switching
transformer
of
switching
ClOOB
ClOOA
and
through
-mv
~
w
1
f-efmln
lat
e
f u
,L
-M
i
3termin,l
.
regu
a
e
»
+WV
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ircui
»
7:
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r
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e
ion
+w
it
2
1,-**ql2
\/
\
i
consistS
which
by
Also,
small
amp.
4
in
below
prevent
and
TI
is
TI
choke

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