Fukuda Denshi 4R2043, Service Manual

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7/16/2019 Fukuda Denshi FX-2111 ECG - Service Manual (1)
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1
.
I n t r
o d
u
c
t
i
o n
1
.
1
In
t
erna
l
P
o we
r
Su pp
li
e
s
F
i
r s t ,
u
n
d
ers t
a
n
d i
n
t e
rn
a
l
po we r
s upp
l ie
s
an
d
t h
ei r
f
u
n
c t
i
on
s .
1 0V
n
T
h
e I O V n
p
owe r i s o
u
t pu t f r o m t
h
e sec o
n
da r
y
s i d e o f t r ans forme r .
S
inc e
i
t i s
n ot
r
e
gulat
e
d
,
i t
f
l
uc t ua
t
e
s
de p e n
d i
n
g o
n t h
e
l
o
a
d
s
t
a t u
s
a n
d
A
C i
np u
t v o
l
t
a g
e
. I
t
i
s
t
r
ansfo rme
d t o
v ariou
s r
egulat e
d v o
l
t
a ge
s
t
o
b
e
supp
l
i e
d t o
r es pe c t i
ve c
i
r c
ui
t
s .
+
1 0 V
I npu t t i
n
g
1 0V
n
, t
h e l o w - l os s
4 -
te
r
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l
r
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l a t
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1 0
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1 0
V
.
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s v o
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t
ag
e i s supp l
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d t o
t h
e
m ot
o
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t h
e
r egul a
t o r whi c h
p r o d u ce s - i - 5 V d .
+
5
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p
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np u
t t in g
+
1
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- ( -
5V
d
.
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ol t
a g
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d
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p o we r
supp
l
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r
digi t
a
l
ci r cu i
t s ,
s
u
c h
a
s
C
P U ,
o
f
t h
e u n
i s
o
l
a t e d
s e c t i
o n .
+ 2
4
V
I
n p u t t
in g
1
0 V
n
,
t h
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s
w it c
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n
g r
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+
2
4 V .
A l im
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i s app l i
e
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at
app r
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0 . 4A
r
e
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r
r
e
d t
o 1 0 V ,
t he r e b y l o we ri n g t h e o u t p ut v o l t a g e .
Th e +
24
V
v o
l
t
a g e i
s
supp
l
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o
t h e t h e r ma l pri n
t
h e a d
.
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t
h e
c
a s
e
o
f
F
X
-
2 111 N
,
it
i
s a ls
o
u
se
d
a
s a
ch ar g
i
n
g
p o we r supp ly .
+
5 V a
( u niso la
t
e
d )
I n
p
u
t
t
i
n
g I
O
V
n
, t h
e d r oppe r t y
p
e
3 -
termina l r
e
gul
a
t o
r
o
u t p u t
s
r
e
gul
a
t e
d
-i
- 5
V a .
-
5V a (
un
i
so l
a
t
ed
)
I
n p u tt in g
+
5
V
a , t h e i n v e
r
t
i
n g t y p e s w it c h
i
n g r egulato r
p r o duce
s
-
5
V a .
± 5
V
a
a r
e
us e
d
a s ana
l
o
g
p ow e r supp
l
i
e
s
f
o
r
DC i
np u t ,
E
C G
c i r c u i
t
a n d
A
I D c o
n
v e r
t
e r .
±
5
V f ( i s
ol
a
t
ed
)
R
e
ceiv i
n
g
1 0 V
n
t h
r o
u
g h t
h
e
i
s o
l
a
t
i o n
t
r ans f orme r w hi c h
is o l
a
t
e
s
t h
e v o
lt a
g e f r o m o
t h e
r c i r c uits
, t h
e 3
-
term i
n
a
l
r
e
gulato
r
o
u t
p
u
t s
r e
gul
a
t
e
d ± 5
V
f
.
T
he
± 5
V
f
a
r e
u s
ed
a
s p
owe
r
suppli e
s fo r d
igit
a
l
c i r c
uit
s o f t
h
e
i
s
o
l a
t
e
d
se
c
t i
o
n
.
± 5V b ( i s o la t ed )
±
5V
b
a r e p r o d
u
c
e
d
f
r o m ±
5V
f
t
h r oug h d i o d
e
s
.
T
he
y a r e
u
s
e
d a
s
p
o w
e
r supp
l i
e
s
fo r a
n
a l o g
c
i r
c
u it s
(
inp
u
t a m p
l
i f
i
e r
s
)
o f t
h
e i
s
o l
a
t
e
d
s e
c
t i
o
n
.
3
-
1
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