Brother FAX-170 Service Manual page 39

FAX-270MC/290MC/520DT/520MC/MFC370MC/390MC
1
1 A
2
R A 3 5 1 X 2
A
3
4
S B T 0 2 6 0 X 2
5
o r
F L 5 R 2 0 0 P N X 2
F G F G
J W 1 6
8
A
4
B
3
7
A
4 - 4 P M J
2
C
3
S B T 0 2 6 0 X 4
o r
F L 5 R 2 0 0 P N X 4
4
1
A
7. MC: METALLIZED POLYESTER FILM CAPACITOR
D
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 IS 1/4W.
1
1 Surge absorber
2 Line relay (CML relay)
Line transformer
3
4 Circuit related to the line transformer
5 High-impedance transformer circuit
Calling signal detector
6
7 Loop current detector
8 Dial pulse generator
Telephone circuit
9
: Reference voltage generation circuit for the operational amplifiers in 4 and 9.
a Noise filters
2 3
+ 2 6 V
2
C R 1
M Z F - 2 4 H G
C M L
o r
O U A Z - S S - 1 2 4 D
+
-
P L S
1
4
3
2
S 0 V
V 1
R 2 4
2 1
6
J W
T E L O F F
3 4
S 0 V
+ 5 V
C
T E L R L
B
E
S 0 V
S R E F
S 0 V
2 3
NCU PCB Circuit Diagram (U.S.A. versions)
4
3
4
S 0 V
5 A
R L 2
4
5
5
R E F
R E F
1 4
C I
S 0 V
2 3
5 3 1
6 4 2
9
+ 2 6 V
+ 5 V
J W 9
S R E F
T E L S L
S 0 V
S 0 V
4
III – 32
5
4
S 0 V
R E F
A
S B T 0 2 6 0
o r
F L 5 R 2 0 0 P N
F G
S 0 V
4 2
+ 5 V
+ 2 6 V
3 1
8
+ 5 V
o r
B A 1 0 3 5 8 S 0 V
4
:
S 0 V
R E F
A E C 1 0
5
6
3
N C U S L
A
R L 1
T E L S L
T E L R L
P L S
T E L O F F
C I
B
R L 2
C M L
+ 2 6 V
+ 5 V
S 0 V
C
P 1
6 0 3 3 B - 1 2 Z
D
6