Toshiba FT-8508, Руководство по обслуживанию

Страница: 21 / 71

— 26 —
3. The base and handset cannot be connected.
Check whether the base is
able to set in the test
mode 1.
Check IC18 and its
peripheral circuit.
Check base RF unit.
Check whether there is a
250 Hz data waveform at
Pin 9 of J1.
Check base RF unit.
Check RT2, R22, R56, R57
R58, R59 and C18.
Set the base in the test
mode 8, 902.984676 MHz
(250 Hz ±7 kHz Dev.) 1 mV
output signal from RF jack
is applied.
Does the bell ring?
NG
OK
NG
OK
Check the TX POWER and
the TX FREQUENCY on
the base unit.
NG
Set the base in the test
mode 3, check whether
deviation of the TX data is
app. 7 kHz Dev.
NG
OK
OK
OK
Check whether there is a
250 Hz data waveform at
Pin 1 of J1.
NG
Check base RF unit.
NG
OK
Check whether there is a
250 Hz data waveform at
the Q2 collector. Check RT1, Q2 and their
peripheral circuits.
NG
OK
Check whether there is a
250 Hz data waveform at
Pin 48 of IC18.
Check Q5, Q6 and their
peripheral circuits.
NG
OK
Check IC18 and its
peripheral circuit.
Check IC603 and its
peripheral circuit.
Check whether the
handset is able to set in the
test mode 1.
NG
OK
Check the TX POWER and
the TX FREQUENCY on
the handset unit.
Check handset RF unit.
NG
OK