17
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 INTCOM key of
the base is pressed, does
pin 14 of IC10 change from
to low?
Check IC10 and its
peripheral circuit.
See 3. The base and handset
cannot be connected.
OK
NG
When the key of the handset
is pressed, can the pulse
output at pin 38 of IC404 be
seen?
NG
Check Keyboard Rubber.
NG
OK
OK
Check IC404.
NG
At the Q408 collector, can
the pulse wave be seen?
OK
Check RINGER Y401.
OK
Check R454, R457, R456,
Q408, Q409 and D402.
NG
Summary of Contents for FT-8509
Page 2: ... 121 5 30 36 6 59 0 18 25 66 7 3 21 70 83 38 6 1 3 1 XJ1 4 ...
Page 11: ...9 BLOCK DIAGRAMS Base Unit ...
Page 12: ...10 Handset Unit ...
Page 13: ...6 0 7 5 06 DVH 8QLW 0DLQ 45 44 ...
Page 15: ... DQGVHW 0DLQ 48 47 ...
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 WIRING DIAGRAMS Base Unit ...
Page 34: ...34 Handset ...
Page 37: ...37 7 8 4 1 16 17 17 5 10 15 11 12 2 9 6 13 14 3 17 Handset RF MODULE HANDSET MAIN PCB ASSY ...
Page 53: ......