— 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.
Summary of Contents for FT-8901
Page 1: ...SERVICE MANUAL PUBLISHED IN JAPAN Apr 2001 FILE NO 2B0 200102 FT 8901 CORDLESS TELEPHONE ...
Page 9: ...BLOCK DIAGRAMS Base Unit 8 ...
Page 10: ... 9 Handset ...
Page 12: ...Handset 12 13 FT8901 Sche p65 01 05 01 12 12 Page 9 Adobe PageMaker 6 5J Win ...
Page 27: ... 28 ELECTRICAL PARTS LOCATION Base Unit Main PCB ...
Page 28: ... 29 Handset Main PCB ...
Page 29: ... 30 WIRING DIAGRAMS Base Unit ...
Page 30: ... 31 Handset ...