— 21 —
6. Voice cannot be transmitted to other party (outgoing call).
Can the base and handset be
connected?
See 3. The base and handset
cannot be connected.
OK
NG
Check IC602 and its
peripheral circuit.
NG
OK
Check whether there is the
1 kHz sine wavefor m at
RT602.
Check RT602 and its
peripheral circuit.
NG
OK
TX output signal from the
handset is detected by the
liner detector, can the 1 kHz
sine waveform be fed?
Check handset RF section.
NG
OK
Check whether there is the
1 kHz sine waveform at Pin 9
of IC4 on the base unit.
Check IC4 and its
peripheral circuit.
NG
OK
Check whether there is the
1 kHz sine waveform at Pin 3
of IC2.
Check RT4 and its
peripheral circuit.
NG
OK
Check whether there is the
1 kHz sine wavefor m at
pin 6 of IC2.
Check IC2 and its
peripheral circuit.
NG
OK
Check whether there is the
1 kHz sine waveform at the
Q3 collector.
Check IC2, Q3 and its
peripheral circuit.
NG
OK
Check whether the 1 kHz sine
wavefor m from TEL-line
output is fed.
Check T1, RL1 and their
peripheral circuits.
NG
OK
Check MC601 of handset.
Check base RF section.
NG
OK
T h e 1 k H z , 9 . 0 m V s i n e
w a v e f o r m i s a p p l i e d t o
M C 6 0 1 + side. Check
whether there is the
1 kHz sine waveform
at Pin 20 of IC602.
Summary of Contents for FT-8901A
Page 1: ...SERVICE MANUAL PUBLISHED IN JAPAN Oct 2001 FILE NO 2BO 200113 FT 8901A CORDLESS TELEPHONE ...
Page 9: ...BLOCK DIAGRAMS Base Unit 8 ...
Page 10: ... 9 Handset Unit ...
Page 12: ...Base Key Unit 12 13 FT8901A Sche p65 01 10 15 10 42 Page 9 Adobe PageMaker 6 5J Win ...
Page 26: ... 28 Unit V Ref No Pin STBY TALK Note Note 61 2 9 2 9 IC608 62 2 9 2 9 63 2 9 2 9 64 2 9 2 9 ...
Page 29: ... 31 ELECTRICAL PARTS LOCATION Base Unit Main PCB ...
Page 30: ... 32 Base Unit Key PCB ...
Page 31: ... 33 Handset Unit Main PCB ...
Page 32: ... 34 WIRING DIAGRAMS Base Unit ...
Page 33: ... 35 Handset Unit ...
