Specifications

III – 32
5
REF
4
S0V
RA351X2
+26V
P1
6033B- 12Z
S0V
+5V
8
4
S0V
631
421
REF
4
3
4
3
S0V
+26V
CML
CR1
MZF- 24HG
or
OUAZ- SS- 124D
FG
2
5
+5V
S0V
SREF
42
53
4
3
1
2
PLS
S0V
+
-
2
1
4
3
S0V
RL 2
21
4
3
TELOFF
REF
4
5
CI
S0V
S0V
NCUSL
S0V
+26V
CML
RL 2
CI
TELOFF
PLS
TELRL
RL 1
TELSL
V1
4- 4PMJ
TELSL
4
3
2
SREF
S0V
S0V
+5V
C
E
B
TELRL
1
+26V
S0V
FG
FG
+5V
+5V
REF
R2 4
JW
JW9
JW16
or
BA10358
SBT0260X4
or
FL5R200PNX4
EC10
SBT0260
or
FL5R200PN
3
SBT0260X2
or
FL5R200PNX2
A
B
123
C
D
123 56
A
B
C
D
6
4
45
A
A
A
1
A
A
A
A
3
8
2
6
5
4
:
7
9
NCU PCB Circuit Diagram (U.S.A. versions)
1 Surge absorber
2 Line relay (CML relay)
3 Line transformer
4 Circuit related to the line transformer
5 High-impedance transformer circuit
6 Calling signal detector
7 Loop current detector
8 Dial pulse generator
9 Telephone circuit
: Reference voltage generation circuit for the operational amplifiers in 4 and 9.
a Noise filters
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 IS 1/4W.
FAX-270MC/290MC/520DT/520MC/MFC370MC/390MC