— 24 —
TROUBLESHOOTING HINTS
1. The bell does not ring.
When the INTCOM key of
the base is pressed, does
the ringer on the handset
ring?
See 2. The bell does not
ring & page does not ring.
When the TEL SG is joined
with the base to make bell
signal, is there pulse wave
at Pin 4 of IC3 (Line 1) or
IC12 (Line 2)?
Check IC3 (Line 1) or
IC12 (Line 2) and TEL network
circuit.
NG
OK
NG
OK
Is there pulse wave at
Pin 62 (Line 1) or 55 (Line 2)
of IC18?
OK
NG
Check R42, R80, R399 and
C51 (Line 1) or R122, R152,
R396 and C88 (Line 2).
Check IC18 and its
peripheral circuit.
Содержание FT-8258
Страница 1: ...SERVICE MANUAL PUBLISHED IN JAPAN Jun 1998 FILE NO 2B0 9801 FT 8258 CORDLESS TELEPHONE ...
Страница 10: ...BLOCK DIAGRAMS Handset Main 9 ...
Страница 11: ...Handset RF 10 ...
Страница 12: ...Base RF 11 ...
Страница 13: ...Base Main 12 13 ...
Страница 14: ... 14 15 SCHEMATIC DIAGRAMS ...
Страница 15: ... 16 17 Base RF ...
Страница 16: ...Base Key 18 19 ...
Страница 17: ... 20 21 Handset Main ...
Страница 18: ... 22 23 Handset RF ...
Страница 37: ...ELECTRICAL PARTS LOCATIONS Base Main 42 ...
Страница 38: ...Base RF 43 ...
Страница 39: ...Base Key 44 ...
Страница 40: ...Handset Main 45 ...
Страница 41: ...Handset RF 46 ...
Страница 42: ...WIRING DIAGRAMS Base 47 ...
Страница 43: ...Handset 48 ...
Страница 75: ...MECHANICAL PARTS LIST ...