22
4. Cannot make a phone call (pulse).
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 23 of IC6
is fed.
Check IC6.
Check Q6, RL1 and their
peripheral circuits.
NG
OK
OK
5. Cannot make a phone call (tone).
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
20 of IC7 is fed?
Check IC7.
OK
NG
Can tone signal be heard
from the handset speaker?
Check IC4, Q3 and their
peripheral circuits.
NG
OK
Check the base TEL-line
circuit and RELAY control
circuit.
NG
Содержание FT-8989
Страница 2: ...CORDLESS TELEPHONE SERVICE MANUAL FILE NO 2B0 9905 FT 8989 PUBLISHED IN JAPAN Sep 1999 ...
Страница 11: ...9 BLOCK DIAGRAMS Base Unit Main ...
Страница 12: ...10 Base Unit DSP ...
Страница 13: ...11 Handset ...
Страница 14: ...12 13 SCHEMATIC DIAGRAMS Base Unit Main ...
Страница 15: ...14 15 Base Unit Key ...
Страница 16: ...16 17 Handset ...
Страница 34: ...35 ELECTRICAL PARTS LOCATION Base Unit Main PCB ...
Страница 35: ...36 Base Unit Key PCB ...
Страница 36: ...37 Handset Main PCB ...
Страница 37: ...38 39 WIRING DIAGRAMS Base Unit ...
Страница 38: ...40 Handset ...
Страница 41: ...43 Handset 7 8 4 15 1 16 17 18 17 5 10 22 11 21 12 20 2 9 6 19 13 14 3 17 RF MODULE HANDSET MAIN PCB ASSY ...
Страница 66: ......