Toshiba FT-8800, Service Manual

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16
A
Check handset RF unit.
Press “3” key, check
whether deviation of the
TX data is app. 8 kHz
Dev. NG Check whether there is a
250 Hz data waveform at
C669. C h e c k R 6 3 5 , R 6 3 6 ,
R 6 3 4 , R 6 3 2 , R 6 1 9 ,
C610, C669 and RT603. NG
OK
Check handset RF unit
and the peripheral circuit
of IC606. Press “6” key,
926.997467 MHz (250
Hz ±8 kHz Dev.) 1mV
output signal from RF
jack is applied. Check
whether the bell ring. NG Check whether the 250
Hz data waveform from
pin 9 of IC606 is fed. NG
OK
Check whether there is a
250 Hz data waveform at
the Q601 collector. Check RT602, Q601 and
their peripheral circuit. NG
OK
Check whether there is a
250 Hz data waveform at
pin 55 of IC603. Check IC601 and their
peripheral circuit. NG
OK
Check IC603 and its
peripheral circuit.
OK
Place the handset on the
base to charge about 5
seconds, then connect
again.
OK