Panasonic KX-UT113RU / KX-UT113RU-B / KX-UT123RU / KX-UT123RU-B (serv.man3) Service Manual ▷ View online
10
KX-UT113RU/KX-UT113RU-B/KX-UT123RU/KX-UT123RU-B
3. Headset Call
Transmitting signal is input from headset microphone and amplified by IC105
→ input to IC501-pin H4 → A/D conversion,
Gain adjustment by a built-in DSP of IC501.
Receiving signal input from IP Line
Receiving signal input from IP Line
→ Gain adjustment and D/A conversion by DSP of IC501 → output from IC501-pin E2 →
output to headset speaker.
+
-
AG2
R144
MICBIAS2
AG2
C164
AG2
OPBIAS2
AG2
R143
HESMIC2
HESSPOUT2
IC105
3
2
1
C168
R142
C161
C165
C169
C167
C166
C170
L112
C178
AG2
R137
R155
C160
CN101 CN205
2
3
C187
AG2
R140
R141
IC501
BBIC
R547
H4
E2
C221
C217
C218
JK202
1
4
2
3
5
C226
C205
D245
21
D247
21
D246
21
L210
L209
L208
10
11
AG
AG
C207
R223
HEADGND
ASIC
IC205
HEADGND
HEADGND
HEADGND
HEADGND
L212
AG
HEADGND
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KX-UT113RU/KX-UT113RU-B/KX-UT123RU/KX-UT123RU-B
4.2.5.
ASIC (IC205)
IC205 controls KEY, LED and Headset-detect.
An operating clock is provided by IC501 and a reset signal from the IC501 starts either reset or normal operating.(L(0V):RESET)
The IC205 and IC501 are connected by an I2C communication.
IC501 checks the presence of IC205 by getting the signal from IC205.
An operating clock is provided by IC501 and a reset signal from the IC501 starts either reset or normal operating.(L(0V):RESET)
The IC205 and IC501 are connected by an I2C communication.
IC501 checks the presence of IC205 by getting the signal from IC205.
LED and KEY Timing chart
The LED control and the KEY control use the same strobe(STB) signal.
Therefore, the LED control and the KEY control are alternately executed.
The timing chart is as shown in the following .
The LED control and the KEY control use the same strobe(STB) signal.
Therefore, the LED control and the KEY control are alternately executed.
The timing chart is as shown in the following .
Note:
Dynamic Lighting Section is not in use.
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KX-UT113RU/KX-UT113RU-B/KX-UT123RU/KX-UT123RU-B
4.2.6.
Key Circuit
The key data is under the matrix control by IC205.
The key information output from LED_STB is input into KEYIN, when the key is pressed.
The key information output from LED_STB is input into KEYIN, when the key is pressed.
The HOOK key is independent from Key Scan Matrix and taken into the port singularly.
KEY Input control timing chart
KEYIN pins have a internal pull-down resistor.
If KEY is pushed, high level is latched by connecting STB(output high) and KEYIN. If not, low level is latched.
The value is fixed by reading twice.
KEYIN pins have a internal pull-down resistor.
If KEY is pushed, high level is latched by connecting STB(output high) and KEYIN. If not, low level is latched.
The value is fixed by reading twice.
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KX-UT113RU/KX-UT113RU-B/KX-UT123RU/KX-UT123RU-B
4.2.7.
LED Circuit
The lighting of the LEDs is controlled by IC205.
All LEDs are controlled by static lighting system.
All LEDs are controlled by static lighting system.
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