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KX-TG5621BXS / KX-TGA561BXS
17 CIRCUIT OPERATION (HANDSET)
17.1. Construction
The circuit mainly consists of DSP and RF part as shown in the block diagram.
17.1.1. DSP: IC201
Function
• Battery Low, Power down detect circuit
• Ringer Generation
• Interface circuit
RF part, Speaker, Mic, LED, Key scan, LCD, Headset
Initial waves
Note:
(*1) The initializing time of the DSP chip is 20ms under normal conditions.
17.1.2. RF part
Mainly voice signal is modulated to RF, or it goes the other way.
17.1.3. EEPROM: IC241
All setting data is stored.
ex: ID code, user setting (Phonebook, Caller ID data)
64
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Troubleshooting
