Read Panasonic KX-TCA355RU Service Manual online
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KX-TCA355RU
4.4.
Circuit Operation (Charge Unit)
To measure the charge-current, R616-619 transfer the current to a voltage.
When the charge-current is 200mA, the voltage is 0.05V.
IC602 amplifies the voltage to 24.5time, then the output voltage is 24.5X0.05=1.225V.
IC601 is DC/DC convertor. This IC adjusts CII to 1.25V.
Then the charge current is adjusted to 204mA.
When charging is completed, the BBIC (IC201) of the portable station set the Q103-Base to "High", then Q102 is turned off. As
a result, the charging current is stopped.
When the charge-current is 200mA, the voltage is 0.05V.
IC602 amplifies the voltage to 24.5time, then the output voltage is 24.5X0.05=1.225V.
IC601 is DC/DC convertor. This IC adjusts CII to 1.25V.
Then the charge current is adjusted to 204mA.
When charging is completed, the BBIC (IC201) of the portable station set the Q103-Base to "High", then Q102 is turned off. As
a result, the charging current is stopped.
4.5.
Signal Route
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