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3. The base and handset cannot be connected.
Check whether the base NG is able to set in the test mode 1. OK Check the TX POWER NG and the TX FREQUENCY on the base unit. OK Press PAGE key twice, NG check whether deviation of the TX data is app. 8 kHz Dev. OK Check D8, IC1 and their peripheral circuits. Check whether there is a NG 250 Hz data waveform at C168. OK Check RT2, R98, R122, R123, R125, R126, C92 and C147. Check RT1, Q4, IC1 and their peripheral circuits. Check IC6 and its peripheral circuit.
Press PAGE key 7 NG times, 902.952467 MHz (250 Hz ±8 kHz Dev.) 1mV output signal from RF jack is applied. Can the IN USE LED be lighted? OK
Check whether there is a NG 250 Hz data waveform at Pin 9 of IC4. OK
Check IC1, FT2 and the peripheral circuit of IC4.
Check whether there is a NG 250 Hz data waveform at Pin 3 of IC2. OK Check whether there is a NG 250 Hz data waveform at Pin 34 of IC6. OK Check IC6 and its peripheral circuit.
Check RT4 and its peripheral circuit.
Check R78, R79, IC2 and their peripheral circuits.
Check whether the NG handset is able to set in the test mode 1. OK Check the TX POWER NG and the TX FREQUENCY on the handset unit. OK A
Check IC608 and its peripheral circuit.
Check RT601, Q602, IC601 and their peripheral circuits.
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