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6. Voice cannot be transmitted to other party (outgoing call).
Can the base and handset be
connected?
See 3. The base and handset
cannot be connected.
OK
NG
The 1 kHz, 9.0mV sine
waveform is applied to
MC601
+
side, can the 1 kHz
sine waveform from pin 24 of
IC603 be fed?
Check Q604 and its
peripheral circuit.
NG
Check whether there is the
1 kHz sine waveform at
pin 20 of IC603.
Check IC603 and its
peripheral circuit.
NG
OK
OK
Check whether there is the
1 kHz sine waveform at
“MOD” RF unit.
Check RT603 and its
peripheral circuit.
NG
OK
TX output signal from the
handset is detected by the
liner detector, can the 1 kHz
sine waveform be fed?
Check handset RF unit.
NG
OK
Check whether there is the
1 kHz sine waveform at pin 9
of IC3 on the base unit.
Check IC3, Q1 and their
peripheral circuit.
NG
OK
Check whether there is the
1 kHz sine waveform at pin 3
of IC1.
Check RT2, Q2 and their
peripheral circuits.
NG
OK
Check whether there is the
1 kHz sine waveform at
pin 6 of IC1.
Check IC1 and its
peripheral circuit.
NG
OK
Check whether there is the
1 kHz sine waveform at the
Q3 collector.
Check IC4, Q3 and its
peripheral circuit.
NG
OK
Check whether the 1 kHz sine
waveform from TEL-line
output is fed.
Check T1, RL1 and their
peripheral circuits.
NG
OK
Check MC601 of handset.
Check base RF unit.
NG
OK