— 18 —
4. Cannot make a phone call (pulse).
5. Cannot make a phone call (tone).
Can the base and handset
be connected?
See 3. The base and handset
cannot be connected.
While in TALK MODE, press
dial key of the handset.
Check whether square
waveform from pin 80 of
IC4 is fed.
Check IC4.
Check Q21, RL1 and their
peripheral circuits.
NG
OK
OK
NG
Can the base and handset be
connected?
See 3. The base and handset
be cannot be connected.
OK
NG
While in TALK MODE, press
dial key of the handset.
Can tone waveform from Pin
36 of IC4 is fed?
Check IC4.
OK
NG
Can tone signal be heard
from the handset speaker?
Check Q13, IC1, Q3 and
their peripheral circuits.
NG
OK
Check the base TEL-line
circuit and RELAY control
circuit.
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 ...