
JT301 : ”High”
Q309 : ON
IC311(5) : “High“
IC311(3) : “High“
IC309(1) : “High“
IC307(7) : “High“
8.1.6. CHARGING DETECTION
If the Handset is put on the charger to recharge it, the DC voltage appears on "CHG+" terminal
of battery connector JT301.
PUT ON THE CHARGER
Q309 ON
IC307(34)
CHARGE START
IC307(44) goes L
Q312 ON
Q311 ON
JT300(CHG-CONT) L
CHARGE STOP
9. CIRCUIT OPERATION (CHARGER)
IC602 amplifies the terminal voltages of R631 to R634 generated by the charge current about 10
times, then supplies them to IC601(5). IC601 controls the charge current and charges the 480mA
constant current so that the voltage of pin 5 becomes 1.25V. When charging is completed, the
CPU(307) of the portable unit sets the terminal of JT601 to "Low", then Q641 is turned ON.
Consequently IC601(3) exceeds 1.25V and switching of IC601 is suspended to stop charging.
Содержание KX-TD7895 - Digital Spread Spedtrum Telephone
Страница 3: ...3 2 CONNECTIONS OF HANDSET ...
Страница 4: ...3 3 BASE UNIT ...
Страница 5: ...4 DISASSEMBLY INSTRUCTIONS 4 1 BASE UNIT ...
Страница 6: ...1 Remove the four screws A and remove the Bottom Cabinet ...
Страница 9: ...2 Take the Battery out of the Rear Cabinet after disconnecting the Connector ...
Страница 10: ...3 Remove two Screws D from the Rear Cabinet ...
Страница 12: ...6 Remove the Antenna from the Front Cabinet after removing the Screw E ...
Страница 13: ...7 Remove the RF unit from the Main Board ...
Страница 20: ...34 CHARGE I ON OFF ...
Страница 23: ...6 4 RF UNIT FREQUENCY TABLE ...
Страница 32: ...10 TROUBLESHOOTING GUIDE 10 1 NO VOICE RECEPTION 10 2 NO VOICE TRANSMISSION ...
Страница 33: ...10 3 NO LINK BASE UNIT ...
Страница 39: ...12 CABINET AND ELECTRICAL PARTS LOCATION 12 1 BASE UNIT ...
Страница 40: ...12 2 HANDSET ...
Страница 41: ...12 3 CHARGER ...
Страница 42: ...13 ACCESSORIES AND PACKING MATERIALS ...
Страница 46: ... CAPACITORS ...
Страница 63: ......
Страница 64: ......