Toshiba FD-4809, Service Manual

Page: 15 / 47

16
A
Check handset RF unit.
Press “3” key, check
whether deviation of the
TX data is app. ±23kHz
~ ±45kHz Dev. NG Check whether there is a
pulse data waveform at
C630. Check whether there is
a pulse data waveform at
pin 40 of IC602. NG
OK
Check handset RF unit
and the peripheral circuit
of IC601, Q605, FT601,
FT602. Press “5” key, 926.49522
MHz (30kHz ±30kHz
Dev.) 1mV output signal
from RF jack is applied.
Check whether the bell
ring. NG Check whether there is
the 30kHz waveform at
C605. NG
OK
Check whether there is a
30kHz pulse waveform at
pin 34 of IC602. C h e ck R 6 2 0 , R 6 2 1 ,
R623, R625, C605, C607,
C608, D611, IC602 and
their peripheral circuit. NG
OK
C h e c k w h e t h e r t h e
voltage at pin 10 of
IC601 is more than 1V. Check IC601 and its
peripheral circuit. NG
OK
Check C606, IC606 and
its peripheral circuit.
OK
Place the handset on the
base to charge about 10
seconds, then connect
again.
OK
C h e ck R 6 5 6 , C 6 3 3 ,
R654, C631 and C630.
Check IC602 and its
peripheral circuit. NG
OK