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7. The voice of the caller cannot be heard (incoming call).
Can the base and handset
be connected?
OK
Apply the 1 kHz 77.5 mV sine
waveform TEL-line of the
base, can the 1 kHz sine
waveform from the Q3
collector be fed?
OK
Check whther there is the
1 kHz sine waveform at
pin 12 of IC1.
OK
Check whther there is the
1 kHz sine waveform at
pin 8 of IC1.
OK
Check whether there is the
1 kHz sine waveform at
MOD of RF unit.
OK
TX output signal from the
base is detected by the
liner detector, can the 1 kHz
sine waveform be fed?
OK
Check whether there is the
1 kHz sine waveform at
pin 28 of IC601 on the
handset unit.
OK
Check whether there is the
1 kHz sine waveform at
pin 29 of IC601.
OK
Check whether there is the
1 kHz sine wave at the
pin 50 of IC601.
OK
Check whether there is the
1 kHz sine waveform at
pin 1 & 2 of SP970.
OK
Check SP970, W602 and
W603.
NG
See 3. The base and
handset cannot be
connected.
NG
Check the base TEL-line
circuit and RELAY control
circuit.
NG
Check IC1 and its
peripheral circuit.
NG
Check IC1 and its
peripheral circuit.
NG
Check RT4 and its
peripheral circuit.
NG
Check base RF unit PCB
(B350).
NG
Check handset RF unit and
the peripheral circuit of
IC601.
NG
Check RT602 and its
peripheral circuits.
NG
Check IC601 and its
peripherial circuit.
NG
Check the peripheral circuit.
— 19 —
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