22
6. TROUBLE WITH SPEAKERPHONE MODE
6-1. The voice of the caller cannot be heard (INCOMING CALL).
6-2. Voice cannot be transmitted to the calling party (OUTGOING CALL).
Check whether there is an
audio waveform on Pin 7 of
IC1.
Check whether there is an
audio waveform on Pin 1 of
IC6.
Check IC1.
OK
NG
Check IC6, RL1 and Q6.
NG
Check whether there is an
audio waveform on Pin 15 of
IC7.
OK
Check IC7.
NG
OK
Check WF701 and SP701.
Check whether there is an
audio waveform on Pin 4 of
IC7.
Check whether there is an
audio waveform on Pin 1 of
IC1.
Check MC251 and IC7.
OK
NG
Check IC1.
NG
Check whether there is an
audio waveform on collector
of Q3.
OK
Check Q3.
NG
OK
Check Q4, T1, RL1 and Q6.
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: ......
