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m-22oocMu/cMc
Fo-215och,ru/cMc
[Signals for status recognition according to input signals]
Signal Name
Function
RHS
H: The handset is in the on-hook state.
L: The handset is in the off-hook state.
incoming call (Cl) detection signal.
H: The handset or external telephone
is in the
L: The handset or external telephone
is in the
[Other signals]
Signal Name
Function
TEL IN
I
Receiving sicnal from line or modem
Transmission
(DTMF) analog signal output
Reception (DTMF, others) analog signal input
(Example: Fax signal send)
NO
) Signal Name (CNLIU)
] NO
]
Signal Name (CNLtU)
1
+24VA
6
RHS
2
DG
9
TXOUT
3
PE
10
RXIN
4
+5v
11
TELMUTE
5
CML
12
NC.
6
Cl
13
TELOUT
7
HS
14
TELIN
9. Sensor
circuit
For the recording paper sensor (P.E), when there is recording paper, the
photo transistor
in the light receiving side is ON and the detection level
is LOW. When there is no recording paper, the photo transistor in the
light receiving side is OFF and the detection level is HIGH.
9. Cl detection
circuit
The Cl detection circuit detects the Cl signals of 15.3Hz to 66Hz.
A Cl signal, which is provided to the photo-coupler
PC1 through the Cl
(0.62 uF), R3 (22 K), and ZD3 when the ring signal is inputted from the
telephone
line.
10. Power supply and blas circuits
The voltages
of +5V and +24VA are supplied from the control PWB unit.
Fig. 7
5-13
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