Toshiba FT-8259, Service Manual

Page: 16 / 60

17
A
Check handset RF unit.
Set the handset in the
test mode 3, check
whether deviation of the
TX data is app. 8 kHz
Dev. NG Check whether there is a
250 Hz data waveform at
“MOD” of RF unit. Check RT603, R619,
R632, R634, R635,
R636 and C610. NG
OK
Check handset RF unit.
NG Set the handset in the
test mode 6, 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. Check IC606, Q612 and
their peripheral circuit. NG
OK
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 R696, R600,
R621, R624, Q602,
IC607 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