19
2. The bell does not ring & page does not ring.
Can the base and handset be
connected?
Press handset DIAL key
while in TALK MODE.
Can key touch sound be
heard from the ringer?
When the PAGE SW of the
base is pressed, does pin24
of IC11 change from high to
low?
Check IC11 and its periph-
eral circuit.
When the key of the handset is
pressed, can the pulse output
at pin 38 of IC404 be seen?
Check RINGER Y401.
Check DSP unit.
See 3. The base and handset
cannot be connected.
Check IC404.
OK
OK
OK
NG
OK
NG
NG
NG
At the Q408 collector, can the
pulse wave be seen?
OK
Check R454, R457, Q409,
Q408 and D402.
NG
Содержание FT-8939
Страница 2: ...CORDLESS TELEPHONE SERVICE MANUAL FILE NO 2B0 9904 FT 8939 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 33: ...34 ELECTRICAL PARTS LOCATION Base Unit Main PCB ...
Страница 34: ...35 Base Unit Key PCB ...
Страница 35: ...36 Handset Main PCB ...
Страница 36: ...37 38 WIRING DIAGRAMS Base Unit ...
Страница 37: ...39 Handset ...
Страница 40: ...42 Handset 7 8 4 1 16 17 17 5 10 15 11 12 2 9 6 13 14 3 17 MAIN PCB ASSY RF MODULE HANDSET ...
Страница 62: ......