21
8. Trouble with intercom mode.
8-1. The voice from the Base unit cannot be heard on the Handset.
Check whether there is an
audio waveform on pin 4 of
IC17.
Check MC1 and IC17.
Check pin 8 of IC15.
NG
OK
8-2. The voice from the Handset cannot be heard on the Base unit.
Check whether there is an
audio waveform on pin 4 of
IC15.
Check IC15.
OK
NG
Check whether there is an
audio waveform on pin 15 of
IC17.
Check IC7, IC8, IC17 and
their peripheral circuits.
OK
NG
Check FC451, W451, W452
and SP451.
Summary of Contents for FT-8259
Page 1: ...CORDLESS TELEPHONE PUBLISHED IN JAPAN Sep 1999 SERVICE MANUAL FILE NO 2B0 9906 FT 8259 ...
Page 8: ...7 BLOCK DIAGRAMS Base Unit ...
Page 9: ...8 Handset ...
Page 10: ...9 10 SCHEMATIC DIAGRAMS Base Unit Main ...
Page 11: ...11 Base Unit Key ...
Page 12: ...12 13 Handset ...
Page 31: ...32 ELECTRICAL PARTS LOCATION Base Unit Main PCB ...
Page 32: ...33 Base Unit Key PCB ...
Page 33: ...34 Handset Main PCB ...
Page 34: ...35 36 WIRING DIAGRAMS Base Unit ...
Page 35: ...37 Handset ...
Page 38: ...40 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 ...
Page 60: ......
