Toshiba FT-8258, Service Manual

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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.