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A
Set the handset in the
NG
test mode 3, check
whether deviation of the
TX data is app. 9.0 kHz
Dev.
OK
Set the handset in the
NG
test mode 6, 926.997467
MHz (250 Hz –8 kHz
Dev.) 1mV output signal
from RF test point is
applied. Check whether
the bell ring.
OK
Place the handset on the
base to charge about 5
seconds, then connect
again.
Check whether there is a
NG
250 Hz data waveform at
"MOD" of RF unit.
OK
Check handset RF unit.
Check whether the 250
NG
Hz data waveform from
pin 9 of IC606 is fed.
OK
Check whether there is a
NG
250 Hz data waveform at
the Q601 collector.
OK
Check whether there is a
NG
250 Hz data waveform at
pin 55 of IC603.
OK
Check IC603 and its
peripheral circuit.
— 17 —
Check R635, R636, R634,
R632, R619, C610, C611,
C669 and RT603.
Check IC606, Q612 and
NG
their peripheral circuit.
OK
Check RT602, Q601 and
their peripheral circuit.
Check R618, R621,
IC601 and their
peripheral circuit.
Check handset RF unit.
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