Toshiba FT-8800 Service Manual page 15

A
Press "3" key, check NG
whether deviation of the
TX data is app. 8 kHz
Dev.
OK
Press "6" key, NG
926.997467 MHz (250
Hz ±8 kHz Dev.) 1mV
output signal from RF
jack 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
C669.
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.
16
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.
Check handset RF unit
and the peripheral circuit
of IC606.
Check RT602, Q601 and
their peripheral circuit.
Check IC601 and their
peripheral circuit.