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General Description
display
1)
M2P.C.B.
Savers < leaeee
AC local
Noise
Supply
'
ahaa
Voltage
Preventin
:
A S
Y yc
Printer
reverting
Circuit
1 Logic
circuit
Circuit
:
Ni-Cd
Battery
Power Supply Section.
(1)
(2)
Noise
Preventing
Transtormer
Circuit
Voltage
Circuit
Vp
-GND
:
8.6V typ.
Vp' —GND
:
7.4V typ.
Vit —GND
:
—23V typ.
Vcc —GND_
:
5.0V typ.
Veom—-GND_
:
5.0V typ.
(While AC is supplied)
VF
—VEF
:
3.8V AC typ. (V.E.)
oc-oc
CONVERTER
(1) Noise filter circuit
Alternating input current is led to transformer through
Fuse and noise filter, composed of C and L. The filter
components
work
not
only
to
prevent
internally
generated
noise from being fed back to AC fine, but
also to attenuate
the spike voltage for prevention of
the effects to Power
Supply
Circuit. The ring core
wound by GND wire of AC cord also works as a noise
filter.
(2) Power transformer
Power transformer transforms the AC input voltage.
R-W770861
:
for AC 100/115V
R-W770861-1
: for AC 220/240V
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battery
Fig. 11
(3) Rectifying circuit
AC input,
having transformed by power transformer, is
bridge-rectified
by diode
D36 ~
D39 and C25.
The
voltage after rectification is 4 ~ 10VOC for the rated
input.
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