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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.

12

Change from the Original Service Manual Section 7.3.
1) Reception
The data from the PBX is received via the H and L lines along the path shown below.

H, L Line 

→ D2 → T2 → R106 → Q102 → IC9 → IC1 Pin 19

2) Transmission
The data to the proprietary telephone is transmitted along the following path.

IC1 Pin 16 

→ Q101 → T2 → D2 → H, L Line