TOSHIBA FT8809 Repair Manual

3. The base and handset cannot be connected.
Check whether the baseNGCheck IC4 and its
is able to set in the testperipheral circuit.
mode 1.
OK
Check the TX POWERNG
Check base RF unit.
and the TX FREQUENCY
on the base unit.
OK
Press ?PAGE? key twiceNG ,Check whether there is aNGCheck RT3, R53, R70,
check whether deviation250 Hz data waveform atR68, R69, R28, C35,
of the TX data is app. 8C80.C80 and C40.
kHz Dev.
OK
OK
Check base RF unit.
Press ?PAGE? key NG7 Check whether there is aNGCheck base RF unit and
times, 902.952467 MHz250 Hz data waveform at the peripheral circuit of
(250 Hz ?8 kHz Dev.) pin 9 of IC3.IC3.
1mV output signal from
OK
RF jack is applied.
Can the IN USE LED be
lighted?
Check whether there is aNGCheck RT2, Q2 and their
OK
250 Hz data waveform atperipheral circuit.
the Q2 collector.
OK
Check whether there is aNGCheck IC1 and their
250 Hz data waveform atperipheral circuit.
pin 37 of IC5.
OK
Check IC5 and its
peripheral circuit.
Check whether theNGCheck IC603 and its
handset is able to set inperipheral circuit.
the test mode 1.
OK
Check the TX POWERNG
Check handset RF unit.
and the TX FREQUENCY
on the handset unit.
OK
A
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