Toshiba FD-4809 Service Manual page 14

3. The base and handset cannot be connected.
Check whether the base
is able to set in the test
mode 1.
OK
Check the TX POWER
and the TX FREQUENCY
on the base unit.
OK
Press "PAGE" key twice,
check whether deviation
of the TX data is app.
±23kHz~±45kHz Dev.
OK
Press "PAGE" key 2
times, 903.417756 MHz
(30kHz ±30kHz Dev.)
1mV output signal from
RF jack is applied.
Can the IN USE/CHARGE
LED be lighted?
OK
Check whether the
handset is able to set in
the test mode 1.
OK
Check the TX POWER
and the TX FREQUENCY
on the handset unit.
OK
A
NG Check IC4 and its
peripheral circuit.
NG
Check base RF unit.
NG Check whether there is a
pulse data waveform at
C47.
OK
Check base RF unit.
NG Check whether there is a
30kHz waveform at C3.
OK
Check whether there is a
30kHz pulse waveform at
pin 34 of IC2.
OK
C h e c k w h e t h e r t h e
voltage at pin 10 of IC1
is more than 1V.
OK
Check C22, IC4 and its
peripheral circuit.
NG Check IC606 and its
peripheral circuit.
NG
Check handset RF unit.
NG Check whether there is a
pulse data waveform at
pin 40 of IC2.
OK
Check R77, C50, R75,
C48 and C47.
NG Check base RF unit and
the peripheral circuit of
IC1, Q1, FT1and FT2.
Check R4, R5, R6, R8,C3,
NG
C4, C5, D1, IC2 and their
peripheral circuit.
NG Check IC1 and its
peripheral circuit.
15
NG C h e c k I C 2 a n d i t s
peripheral circuit.