DOWNLOAD Panasonic KX-T7730RU (serv.man4) Service Manual ↓ Size: 912.7 KB | Pages: 22 in PDF or view online for FREE

8

46

P1_2

I/O

O

LED6

47

P1_1

I/O

O

LED7

48

P1_0

I/O

O

RESET_OUT

49

P0_7

I/O

I

DTMF Column

50

P0_6

I/O

I

DTMF Row

51

P0_5

I/O

O

open

52

P0_4

I/O

O

Tone cont 1

53

P0_3

I/O

O

Tone cont 2

54

P0_2

I/O

O

Tone cont 3

55

P0_1

I/O

O

Tone cont 4

56

P0_0

I/O

O

HS/HF SP vol 1

57

P6_4

I/O

O

HS/HF SP vol 2

58

P6_3

I/O

O

HF SP vol 3

59

P6_2

I/O

O

HF SP vol 4

60

P6_1

I/O

O

open

61

P6_0

I/O

O

open

62

P5_7

I/O

O

open

63

P5_6

I/O

I

Head Set Detention

64

P3_2

I/O

I

TONE-DET

Pin No.

Terminal Name

I/O Function

I/OSetting

Description

9

Change from the Original Service Manual Section 6.

USD PRIVING

CIRCUIT

(Q105~108)

H

L

T

R

T2

POWER

REGULATOR

(IC7)

SIGNAL

TRANSMITTING

CIRCUIT(Q101)

SIGNAL

RECEIVING

CIRCUIT(Q102)

IC9

RESET IC

(IC2)

Vcc(5V)

POWER

REGULATOR

(IC11)

Vcc(3.3V)

CPU

(IC1)

X1

DRIVING

CIRCUIT

(Q103,Q104)

LED

LCD

KEY

LCD Module

RINGER

DTMF

SPEAKER

MIC

HEADSET

HANDSET

SP-PHONE

(IC3)

Handset Amp

(Q5,Q8)

Pre Amp

(Q4)

HYBRID

CIRCUIT

(Q3)

DIODE

BRIDGE

(D1)

DIODE

BRIDGE

(D2)

T1

KX-T7730R

U MAIN BO

ARD

10

Change from the Original Service Manual Section 7.1.
Sequential input information is executed by dynamic scanning.
The ports P3_1, P3_6, P8_4~6, P8_1 of IC1 are brought to hifh status consecutively.
If a key is pressed, the key-in information input is executed by ports P2_1~7, P6_1~2.

11

Change from the Original Service Manual Section 7.2.
Circuit Operation:
The LED executes dynamic lighting for the status indicators, and control is executed by the output ports P3_1, P3_6, P8_5~6,
P4_5, P1_1~7.