Panasonic KX-T7730RU (serv.man4) Service Manual / Supplement ▷ View online
10
KX-T7730RU
1.5.
CIRCUIT OPERATIONS
1.5.1.
KEY INPUT CONTROL CIRCUIT
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.
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.
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KX-T7730RU
1.5.2.
LED CIRCUIT
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.
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.
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KX-T7730RU
1.5.3.
DATA COMMUNICATION CIRCUIT
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.
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.
The data to the proprietary telephone is transmitted along the following path.
IC1 Pin 16
→ Q101 → T2 → D2 → H, L Line
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KX-T7730RU
1.5.4.
TONE GENERATION CIRCUIT
Change from the Original Service Manual Section 7.4.
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