Toshiba FT-8901A Service Manual page 16

3. The base and handset cannot be connected.
Check whether the base
is able to set in the test
mode 8.
OK
Check the TX POWER
and the TX FREQUENCY
on the base unit.
OK
Set the base in the test
mode 10, check
whether deviation of the
TX data is app. 9.0 kHz
Dev.
OK
Set the base in the test
mode 13,
902.952467MHz
(250 Hz ±8 kHz Dev.)
1mV output signal from
RF test point is
a p p l i e d . D o e s t h e
CHARGE LED light?
OK
Check whether the
handset is able to be
set in the test mode 1.
OK
Check the TX POWER
and the TX FREQUENCY
on the handset unit.
OK
A
NG Check IC6 and its
peripheral circuit.
NG
Check base RF section.
NG Check whether there is a
250 Hz data waveform at
RT2.
OK
Check base RF section.
NG Check whether there is a
250 Hz data waveform at
RT4 AF test point.
OK
Check whether there is a
250 Hz data waveform at
Pin 10 of IC2.
OK
Check whether there is a
250 Hz data waveform at
Pin 64 of IC6.
OK
Check IC6 and its
peripheral circuit.
NG Check IC608 and its
peripheral circuit.
NG Check handset RF
section.
NG Check RT2, R91, R98,
R123, C92 and C147.
NG Check IC4 and its
peripheral circuit.
OK
NG Check RT4, IC2 and
their peripheral circuits.
NG
Check R79, R214, R215,
IC2 and their peripheral
circuits.
— 18 —
NG
Check base RF section.