Read Panasonic KX-TCA175RU Service Manual online
12
KX-TCA175RU
• LED Circuit
BBIC (IC3) controls each LEDs.
4.2.7.
Ringer Circuit
During ringing, a signal is sent from pin 112 of IC3 to a monitor speaker through speaker Amplifier IC (IC5). At this time, BBIC
(IC3) makes pin 1 of IC5 from low to high.
(IC3) makes pin 1 of IC5 from low to high.
4.2.8.
Key Click Sound Circuit
When the key is pushed, a signal is sent from pin 12 of IC3 to a monitor speaker through speaker Amplifier IC (IC5). At this
time, BBIC (IC3) makes pin 1 of IC5 from low to high.
time, BBIC (IC3) makes pin 1 of IC5 from low to high.
Type of LED
LED ON
LED OFF
Call/Charge Indicator LED (Green), D1 IC3-81pin = High
Q6 = ON
IC3-81pin = Low
Q6 = OFF
Q6 = OFF
Call/Charge Indicator LED (Red), D1
IC3-80pin = High
Q7 = ON
Q7 = ON
IC3-80pin = Low
Q7 = OFF
Q7 = OFF
Key back-light LEDs (Yellow)
D3-D10, D17-D24
D3-D10, D17-D24
IC3-42pin = High
Q12 = ON
Q12 = ON
IC3-42pin = Low
Q12 = OFF
Q12 = OFF
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