17
2. The bell does not ring & page does not ring.
When the INTCOM key of
the base is pressed, does
pin 32 of IC22 change from
to low?
OK
Press handset DIAL key
while in TALK MODE.
Can key touch sound be
heard from the ringer?
OK
OK
Check IC22 and its
peripheral circuit.
Can the base and handset
be connected.
NG
At the Q616 collector, can
the pulse wave be seen?
NG
Check Keyboard Rubber.
NG
See 3. The base and handset
cannot be connected.
Check IC603.
NG
When the key of the
handset is pressed, can the
pulse output at pin 58 of
IC603 be seen?
OK
Check R688, R689, R672,
R673, R629, Q616, Q617
and D604.
NG
OK
Check RINGER Y601.
Summary of Contents for FT-8859
Page 2: ...CORDLESS TELEPHONE SERVICE MANUAL FILE NO 2B0 9907 FT 8859 PUBLISHED IN JAPAN Oct 1999 ...
Page 11: ...9 BLOCK DIAGRAMS Base Unit ...
Page 12: ...10 Handset Unit ...
Page 13: ...11 12 SCHEMATIC DIAGRAMS Base Unit Main ...
Page 15: ...14 15 Handset ...
Page 30: ...30 ELECTRICAL PARTS LOCATION Base Unit Main PCB ...
Page 31: ...31 Base Unit Key PCB ...
Page 32: ...32 Handset Main PCB ...
Page 33: ...33 34 WIRING DIAGRAMS Base Unit ...
Page 34: ...35 Handset ...
Page 57: ......
