- first/ second mixer
- Amplifier for transmission and reception
- Additionally,
- Power Supply Circuit
- Reset Circuit
- Charge Circuit
- Telephone Line Interface Circuit
Handset consist of the following ICs as shown in BLOCK DIAGRAM.
- CPU: IC2
- All data signals (forming/analyzing ACK or CMD signal*)
- All interfaces (ex; LED, Key, Buzzer, Detector Circuit, Charge,
Battery Low)
- RAM for keeping the data (CH Number, ID Code, etc.)
- RF IC:IC1
- PLL Oscillator
- Detector
- Compress/Expander
- first, second mixer
- Amplifier for transmission and reception
*Refer to
EXPLANATION OF CPU DATA COMMUNICATION
().
16.2. Power Supply Circuit
The power supply to the CPU (Digital, Analog) and RF IC from AC Adaptor (+12V) is shown in
the diagram below.
The base unit power supply is DC12V. The handset's power is supplied from 3.6V battery (Nickel-
Cadmium battery) which is
installed in the handset.
Power supply for transmitter is turned on by a press of "Talk" key on the handset. During the
stand-by mode, the unit stops
transmitting but receives the signal.
Also during on-hook condition (the handset is placed on the base unit), backup power for
memory of the last dialed number is
supplied through the battery (3.6V nickel-cadmium in the handset). The memory of this unit is
not backed up by the current from
the telephone line.
The base unit DC power supply is regulated by Q18, the CPU power is regulated by Q19. The Q8,
32
Содержание KX-TC1200NLB
Страница 3: ...2 BATTERY REPLACEMENT 3 LOCATION OF CONTROLS 3 1 Base Unit 3 ...
Страница 4: ...3 2 Handset 4 ...
Страница 5: ...4 CONNECTION 5 ...
Страница 7: ...5 2 Answering Calls 5 3 Storing Phone Numbers in Memory 7 ...
Страница 8: ...5 4 Storing a Phone Number in the DIRECT Button 5 5 Dialing a Stored Number 8 ...
Страница 9: ...5 6 Dialing a Stored Number in the DIRECT Button 5 7 Recall Button 9 ...
Страница 10: ...6 DISASSEMBLY INSTRUCTIONS 10 ...
Страница 22: ...Note Refet to CIRCUIT BOARD Handset Signal Route 9 2 How to change the channel 9 3 Adjustment 22 ...
Страница 25: ...25 ...
Страница 27: ... The channel is changed if the noise interferes with the conversation 13 2 Ringing 27 ...
Страница 28: ...13 3 Changing the Channel 28 ...
Страница 38: ...Fig 4 Fig 5 38 ...
Страница 40: ...19 CPU DATA Handset 19 1 IC2 40 ...
Страница 41: ...20 HOW TO REPLACE FLAT PACKAGE IC 20 1 Preparation SOLDER 41 ...
Страница 44: ...22 CABINET AND ELECTRICAL PARTS LOCATION HANDET 44 ...
Страница 45: ...23 ACCESSORIES AND PACKING MATERIALS 45 ...
Страница 61: ...IC5 KX TC1200NLB CIRCUIT BOARD Component View Base Unit ...
Страница 63: ...IC2 150Ω AF Volt Meter H Oscilloscope G Noise Squelch A Battery Low 47µF AF Generator ...