10
(Model KX-FP300E)
KX-FP300E
6.7. NCU SECTION (Change from original page 155.)
6.7.1. GENERAL
This section is the interface between the telephone line and exterminal telephone. It is composed of an EXT.
TEL line relay (RL1), bell detection circuit, pulse dial circuit, pulse dial circuit, auto disconnect circuit, TAM interface
circuit, line amplifer and sidetone circuits and a multiplexer.
6.7.2. EXT. TEL. LINE RELAY (RL1)
1. Circuit Operation
Normaly, this relay switches to the external telephone side (break) and switches to the open side (make) when the unit starts
facsimile communication.
{IC5 (26) High Level Q14 ON RL1 (make)
6.7.3. TELEPHONE LINE CONNECTION
Circuit Diagram
120V
NO USED
+5VD
COILIN
COILOUT
GND
A-OUT
OUT1
OUT2
VCC
3
3
1
1
3
1
2
2
6
7
4
5
C3
C4
C7
C10
C12
C15
Q3
D6
C13
C9
C8
L9
R19
R7
C2
C16
D9
ZNR1
SA1
L3
SA2
R192
R4
D35
R17
R20
R16
R18
PC3
PC2
D5
C14
C163
D4
R13
D3
C1
R8
PC1
CN1
J3
J2
J62
J1
J11
J10
J6
J9
J17
J18
J21
J22
J12
+5VD
+5VD
RLY2
1
2
3
4
5
6
b2
E
a
b
S
a2
CN2
J7
J16
J15
J14
J20
J5
L2
L1
J8
J64
J13
J4
1
2
3
4
5
6
a2
S
a
b
E
b2
J19
C153
EX-HOOK
J26
RLY3
J27
J24
J25
2
4
2
3
4
1
1
1
3
2
3
1
4
2
3
1
4
7
5
6
L5
FG
Q2
R2
Q1
Q18
IC1
POS1
L4
D1 D2
C203
R9
N0 USED
RLY1-1
F1
J23
L8
RLY1-2
+5VD
2
3
+
—
1
1
4
3
3
2
6
3
4
C11
D7
C162
C6
T2
R15
C5
R10
R11
R12
1
2
3
4
+
—~
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