KX-NS5180X-SX, KX-NS5180XSX - Panasonic PBX Service Manual (repair manual). Page 8

8

Making DP[0-5] pin of DSP (IC101) becomes Low level, and RL101A-F turns ON and the line is acquired.
It is used in common as Dial Pulse transmitting circuit.

1. Ring 

 L100  D101  D103  D104  Q100(C-E)  R112  D104  RL101  L100  Tip

2. Tip 

 L100  RL101  D104  R112  Q100(C-E)  D104  D103  D101  L100  Ring

After line acquisition, DC and/or AC characteristics (Dynamic Range and Distortion etc) are controlled by current controll function of
DC Loop Circuit.
Also it provides the SHUNT control function for the stabilization of line power depending on the destination. Turning on  PC103A-F
when transmitting pulse reduces the impedance at making, and stabilizes the line power.

DTMF signal is generated by DTMF generator in the DSP device (IC101A-C).

From DSP (IC101)

+

-

-

-

+

-

+

-

REVDET[0]

VIN[0]

VOUT[0]

SHNT[0]

SHNT[0]

DP[0]

PC103A

1

2

3

4

R126A

SA100A

1

2

3

AL2

R103A

C110A

R112A

R115A

RL100A

NC

1

2

2

3

4

R102A

DG

DG

C104A

PC101A

1

2

3

4

C111A

R118A

DG

C109A

ZNR100A

+3.3V

+3.3V

R101A

+3.3V

RL101A

1

3

4

DG

DG

C112A

R106A

D104A

1

3

4

2

R117A

R125A

C113A

D109A

1

3

2

DG

SFG

R116A

D101A

+3.3V

PC100A

1

2

4

3

FG

VH1

VH1

C103A

R109A

D103A

VH1

R110A

+15V

+3.3V

TH100A

C105A

D110A

SFG

C102A

R121A

T100A

3

1

4
5
6

+3.3V

R108A

R171A

+3.3V

L100A

1

4

2

3

C138A

C139A

J100A

R122A

R124A

IC100A

4

VEE

8

VCC

Q100A

R113A

IC100A

3

2

1

IC100A

5

6

7

C107A C145A

C106A

R119A

R120A

R123A

R127A

R132A

R133A

C108A

C121A

C120A

A

From DSP (IC101)

+

-

+

-

VIN[0]

VOUT[0]

SHNT[0]

DP[0]

R126A

C110A

DG

C111A

R118A

DG

C109A

C112A

R125A

C113A

D109A

1

3

2

VH1

VH1

VH1

+15V

R121A

T100A

3

1

4
5
6

+3.3V

R171A

+3.3V

C138A

C139A

R122A

R124A

IC100A

4

VEE

8

VCC

IC100A

3

2

1

IC100A

5

6

7

C107A C145A

R119A

R120A

R123A

R127A

R132A

R133A

C108A

C121A

C120A