Toshiba FT-8800, Service Manual

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15
3. The base and handset cannot be connected.
Check whether the base
is able to set in the test
mode 1.
OK
NG
A
Check IC4 and its
peripheral circuit.
Check base RF unit and
the peripheral circuit of
IC3.
Check the TX POWER
and the TX FREQUENCY
on the base unit.
OK
NG
Check base RF unit.
Press “PAGE” key twice,
check whether deviation
of the TX data is app. 8
kHz Dev.
OK
NG Check whether there is a
250 Hz data waveform at
C80. Check RT3, R53, R70,
R68, R69, R28, C35,
C80 and C89. NG
OK
Check base RF unit.
P r e s s “ PAG E ” key 7
times, 902.952467 MHz
(250 Hz ±8 kHz Dev.)
1mV output signal from
RF jack is applied.
Can the IN USE LED be
lighted?
OK
NG Check whether there is a
250 Hz data waveform at
pin 9 of IC3. NG
OK
Check whether there is a
250 Hz data waveform at
the Q2 collector. Check RT2, Q2 and their
peripheral circuit.
NG
OK
Check whether there is a
250 Hz data waveform at
pin 23 of IC2. Check IC1 and their
peripheral circuit. NG
OK
Check IC2 and its
peripheral circuit.
Check whether the
handset is able to set in
the test mode 1.
OK
NG Check IC603 and its
peripheral circuit.
Check the TX POWER
and the TX FREQUENCY
on the handset unit.
OK
NG
Check handset RF unit.