Toshiba FT-7007LBR, Service Manual

Page: 17 / 43

18
6. Voice cannot be transmitted to other party (outgoing call).
Can the base and handset be
connected? See 3. The base and handset
be cannot be connected.
OK
NG
Does the bias voltage exitst
at MC501? Check R573, R554, R575,
R550 and C564.
OK
NG
The 1kHz 18mV sine waveform
is applied to MC501 +side, can
the 1kHz sine waveform Pin13
of IC501 be fed? Check IC501 and Pin13~14
peripheral circuits of IC501.
OK
NG
Check whether there is the sine
waveform at Pin9 of IC501. Check IC501 and Pin 9~11
peripheral circuits of IC501.
OK
NG
TX output signal from the
handset is detected by the liner
detector, can the 1kHz 3kHz
Dev. sine waveform be fed.
Check C509, R569 and R527.
OK
NG
Check Whether there is the
1kHz sine waveform at Pin16
of IC1. Check IC1 and Pin15~16
peripheral circuits of IC1.
OK
NG
Check whether there is the
1kHz sine waveform at Pin20
of IC1. Check IC1 and Pin17~20
peripheral circuits of IC1.
OK
NG
Check whether there is the
1kHz sine waveform at the
Q1 collector. Check Q1 and its peripheral
circuit.
OK
NG
Check whether the 1kHz sine
wavefor m from TEL-line
output is fed. Check T1, RL1 and their
peripheral circuits.
OK
NG
Check MC601 of handset.