— 30 —
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).
OK
Check IC15.
Check whether there is an
audio waveform on Pin 8
of IC15 (Line 2).
NG
OK
Check IC20.
Check whether there is an
audio waveform on Pin 14
of IC20.
NG
OK
Check W702 and SP701.
Check IC16, RL1 and Q8.
Check whether there is an
audio waveform on Pin 1
of IC16.
NG
Check MC351 and IC20.
Check whether there is an
audio waveform on Pin 23
of IC20.
NG
OK
Check IC1.
Check whether there is an
audio waveform on Pin 2
of IC1.
NG
OK
Check IC2 .
Check whether there is an
audio waveform on Pin 7
of IC2.
NG
OK
Check Q1, T1, RL1 and Q8.
Summary of Contents for FT-8508
Page 1: ...SERVICE MANUAL PUBLISHED IN JAPAN Jun 1998 FILE NO 2B0 9804 FT 8508 CORDLESS TELEPHONE ...
Page 3: ... 2 OPERATING CONTROLS BASE UNIT CONTROLS HANDSET CONTROLS RS YZ 1 2 ...
Page 10: ...Handset Main 9 BLOCK DIAGRAMS ...
Page 11: ...Handset RF 10 ...
Page 12: ...Base RF 11 ...
Page 13: ...Base Main 12 13 ...
Page 14: ...SCHEMATIC DIAGRAMS Base Main 14 15 ...
Page 15: ...Base RF 16 17 ...
Page 16: ...Base Key 18 19 ...
Page 17: ...Handset Main 20 21 ...
Page 18: ...Handset RF 22 23 ...
Page 36: ...Base Main 41 ELECTRICAL PARTS LOCATION ...
Page 37: ...Base RF 42 ...
Page 38: ...Base Key 43 ...
Page 39: ...Handset Main 44 ...
Page 40: ...Handset RF 45 ...
Page 41: ...Base 46 WIRING DIAGRAMS ...
Page 71: ...MECHANICAL PARTS LIST ...
