TOSHIBA FT8908 Repair Manual

6. Voice cannot be transmitted to other party (outgoing call).
NG
See 3. The base and
Can the base and handset
handset cannot be
be connected?
connected.
OK
NG
The 1 kHz, 12.5 mV sineCheck Q608 and its
waveform is applied toperipheral circuit.
MC601 + side, can the
1 kHz sine waveform from
pin 7 of IC601 be fed?
OK
NG
Check whether there is theCheck IC601 and its
1 kHz sine waveform atperipheral circuit.
pin 10 of IC601.
OK
NG
Check whether there is theCheck VR601 and its
1 kHz sine waveform atperipheral circuit.
pin 9 of 601.
OK
NG
TX output signal from the
Check handset RF unit.
handset is detected by the
liner detector, can the 1 kHz
sine waveform be fed?
OK
NG
Check whether there is the
Check base RF unit.
1 kHz sine waveform at
pin 1 of J2 on the base unit.
OK
NG
Check whether there is theCheck RT1, Q1 and their
1 kHz sine waveform atperipheral circuits.
pin 5 of IC1.
OK
NG
Check whether there is theCheck IC1 and its
1 kHz sine waveform atperipheral circuit.
pin 3 of IC1.
OK
NG
Check whether there is theCheck IC6, Q2 and their
1 kHz sine waveform at theperipheral circuits.
Q2 collector.
OK
NG
Check whether the 1 kHzCheck T1, RL1 and their
sine waveform fromperipheral circuits.
TEL-line output is fed.
OK
Check MC601 of handset.
? 31 ?