Brother International FAX-170 Service Manual - Page 44

Circuit, Diagram, U.S.A., versions

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FAX-270MC/290IVIC/520DT/520MC/IVIFC370MC/3901VIC 3 RAO, Al 4 AP 5 001,1%, 82P141 4 L9 L4 3 -> 13 2 .t5R2OOP.X. LS L7 2 3 V DI 199120 It R1 a3 art C1 CI _ 13 16V m • C SD10111140 S1o 2B00 EDR3AI 5-04 1R1102004 rt -// I7LIL127 P49. 33 JO ••• 1 B7T7 PCC15153 4DDV -d r, R109 Br, 1' /7.=\ 201 k.11. ) MC251C004V74 p147i/.2K. DP 0 2 C3 CEC42. PP , . R0210 t C6 200.1K0 CI ' R154K 10 CC221 1K0O0K •- ',A ,V- • R12 100 •VVte 1R070K 'N; JCCCBPE3.I36K R25 PC3 P926261 VLP320 1_ )i I. P(It fi I A I Da 'sail° r,i;- 5_0, Lo;;r21 P9;;21 VIEW 11.12 TOP J3 TOP VIEW PSLIDUGE PSLIDUEG JW I .1. 1 . 7. , t5R2OOPO irosa DA O253 C14 eel D4 15V EICCSEVIODU , • CAC2803 • 1121 0,0 V 1R016 R15203 Dv CCCI B223 2R72K2 C13 CCSSI R17 100 2O0. 32V • ECCBI7V1DDP"7,1,3 I SVDP BPI mm:=0;Ix RI O17K 27Kci 2 C19 RIO CC223 R14 00K CCI391 90V REF R3-I 3K 50V EC10D •avO 50v0 7. MC: METALLIZED POLYESTER FILM CAPACITOR 6. PC: POLYESTER FILM CAPACITOR 5. CC: CERAMIC CAPACITOR 4. EC: ALUMINUM ELECTROLYTIC CAPACITOR 3. COMPONENTS IN PARENTHESES NOT TO BE MOUNTED. 2. UNLESS OTHERWISE SPECIFIED, THE VOLTAGE RESISTANCE OF CAPACITORS IS 25V OR 50V. 1. UNLESS OTHERWISE SPECIFIED, POWER CONSUMPTION OF RESISTORS 151/4W. 2 3 4 5 NCU PCB Circuit Diagram (U.S.A. versions) O Surge absorber ® Line relay (CML relay) • Line transformer • Circuit related to the line transformer ® High-impedance transformer circuit ® Calling signal detector ® Loop current detector ® Dial pulse generator ® Telephone circuit O Reference voltage generation circuit for the operational amplifiers in ® and ®. 11 Noise filters III - 32

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FAX-270MC/290IVIC/520DT/520MC/IVIFC370MC/3901VIC
->
3
4
5
RAO,
Al
AP
2
C
I
_
DI
199120
It
R3
1
aart
3
V
1
3
m
82P141
4
3
13
2
L9
L4
001,1%,
•••
•
C
D01
S111140
S1
o
2B00
D3
ERA
I
5-04
R20
1004
11
rt
//
-
I7LIL127
P49
.
33
JO
C1
C3
C4
E
C2.
PP
16V
,
.
R1
020
t
C6
1 7
BT7
C15
PC153
r,
4DDV
Br,
-d
R9
10
/7.=\
1
'
k.1
.
1)
201
)i
P(It
I.
PC3
P926261
fi
I
VLP320
1
_
R25
C10
MC474
pi.
1/2
.
250V
47K
A
I
DP 0 2
0.
10
20K
CI
'
R4
15K
Da
_
'sail°
r,i
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or
L;;21
9;;
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100K
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3.3K
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I
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LS
.t5R2OOP.X.
0,0
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R16
10
•
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AC2803
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CCSSI
150
Dv
R17
100
CI
B
R22
CC223
27K
L7
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I
OK
90V
C19
RIO
RI
CC223
27K
ci
2
R14
3- 3K
CCI391
00K
REF
50V
7.
MC:
METALLIZED
POLYESTER
FILM
CAPACITOR
6.
PC:
POLYESTER
FILM
CAPACITOR
5.
CC:
CERAMIC
CAPACITOR
4.
EC:
ALUMINUM
ELECTROLYTIC
CAPACITOR
3.
COMPONENTS
IN
PARENTHESES
NOT
TO
BE
MOUNTED.
2.
UNLESS
OTHERWISE
SPECIFIED,
THE
VOLTAGE
RESISTANCE
OF
CAPACITORS
IS
25V
OR
50V.
1.
UNLESS
OTHERWISE
SPECIFIED,
POWER
CONSUMPTION
OF
RESISTORS
151/4W.
11.12
J3
TOP
VIEW
TOP
VIEW
PLUG
PLUG
SIDE
SIDE
203
O.
2V
•
1121
•
CI7
"
EC1DDP
BV
7,1,3
BPI
DP
I
SV
mm:=0;Ix
JW
I
.1.
1 .
7.
,
t5R2OOPO
irosa
DA
O253
C14
eel
D4
15V
•avO
50v0
EC10D
2
3
4
5
NCU
PCB
Circuit
Diagram
(U.S.A.
versions)
O
Surge
absorber
®
Line
relay
(CML
relay)
•
Line
transformer
•
Circuit
related
to
the
line
transformer
®
High
-impedance
transformer
circuit
®
Calling
signal
detector
®
Loop
current
detector
®
Dial
pulse
generator
®
Telephone
circuit
O
Reference
voltage
generation
circuit
for
the
operational
amplifiers
in
®
and
®.
11
Noise
filters
III
-
32