
7. CIRCUIT OPERATION (BASE UNIT)
7.1. MAIN BOARD
7.1.1. POWER SUPPLY CIRCUIT
The Voltage between 9V and 16V is supplied to the DC Jack from the AC adaptor.
The Power for the RF Unit is supplied from IC251 and Q261.
The Power for the Analog Circuit is supplied from Q101.
The Power for the Main Board, Reset and Power Down Circuit are supplied from IC110.
7.1.2. BELL DETECTOR CIRCUIT
When the Bell signal is input between T/R, the signal of which waveform is shaped through
C100
R100
PC100 is input to pin (36) of the IC105(LPR). When the IC105(LPR) detects the
Summary of Contents for KX-TD7895 - Digital Spread Spedtrum Telephone
Page 3: ...3 2 CONNECTIONS OF HANDSET ...
Page 4: ...3 3 BASE UNIT ...
Page 5: ...4 DISASSEMBLY INSTRUCTIONS 4 1 BASE UNIT ...
Page 6: ...1 Remove the four screws A and remove the Bottom Cabinet ...
Page 9: ...2 Take the Battery out of the Rear Cabinet after disconnecting the Connector ...
Page 10: ...3 Remove two Screws D from the Rear Cabinet ...
Page 12: ...6 Remove the Antenna from the Front Cabinet after removing the Screw E ...
Page 13: ...7 Remove the RF unit from the Main Board ...
Page 20: ...34 CHARGE I ON OFF ...
Page 23: ...6 4 RF UNIT FREQUENCY TABLE ...
Page 32: ...10 TROUBLESHOOTING GUIDE 10 1 NO VOICE RECEPTION 10 2 NO VOICE TRANSMISSION ...
Page 33: ...10 3 NO LINK BASE UNIT ...
Page 39: ...12 CABINET AND ELECTRICAL PARTS LOCATION 12 1 BASE UNIT ...
Page 40: ...12 2 HANDSET ...
Page 41: ...12 3 CHARGER ...
Page 42: ...13 ACCESSORIES AND PACKING MATERIALS ...
Page 46: ... CAPACITORS ...
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