— 20 —
7. The voice of the caller cannot be heard (incoming call).
Can the base and handset be
connected?
See 3. The base and handset
cannot be connected.
OK
NG
The 1 kHz, -15dBm sine
waveform is applied to TEL-
line of the base, can the 1 kHz
sine waveform from the Q3
collector be fed?
Check the base TEL-line
circuit and REPLAY control
circuit.
NG
Check whether there is the
1 kHz sine wavefor m at
pin 24 of IC1.
Check Q11 and its peripheral
circuit.
NG
OK
OK
Check whether there is the
1 kHz sine wavefor m at
pin 20 of IC1.
Check IC1 and its peripheral
circuit.
NG
OK
TX output signal from the
base is detected by the liner
detector, can the 1 kHz sine
waveform be fed?
Check base RF unit.
NG
OK
Check whether there is the
1 kHz sine waveform at pin 9
of IC601 on the handset unit.
Check IC601, Q601 and
their peripheral circuit.
NG
OK
Check whether there is the
1 kHz sine waveform at pin 3
of IC603.
Check RT602, Q602 and
their peripheral circuits.
NG
OK
Check whether there is the
1 kHz sine waveform at the
pin 18 of IC603.
Check IC603 and its
peripheral circuit.
NG
OK
Check whether there is the
1 kHz sine waveform at pin
1, 2 of SP801.
Check Q605, Q606 and its
peripheral circuit.
NG
OK
Check SP801 and W801,
W802.
Check handset RF unit.
NG
OK
Check whether there is the
1 kHz sine wavefor m at
“MOD” RF unit.
Check RT3 and its
peripheral circuit.
NG
OK
Содержание FT-8901
Страница 1: ...SERVICE MANUAL PUBLISHED IN JAPAN Apr 2001 FILE NO 2B0 200102 FT 8901 CORDLESS TELEPHONE ...
Страница 9: ...BLOCK DIAGRAMS Base Unit 8 ...
Страница 10: ... 9 Handset ...
Страница 11: ...SCHEMATIC DIAGRAMS Base Unit 10 11 FT8901 Sche p65 01 05 01 12 12 Page 8 Adobe PageMaker 6 5J Win ...
Страница 12: ...Handset 12 13 FT8901 Sche p65 01 05 01 12 12 Page 9 Adobe PageMaker 6 5J Win ...
Страница 27: ... 28 ELECTRICAL PARTS LOCATION Base Unit Main PCB ...
Страница 28: ... 29 Handset Main PCB ...
Страница 29: ... 30 WIRING DIAGRAMS Base Unit ...
Страница 30: ... 31 Handset ...