Troubleshooting Hints - Toshiba FT-3809 BK Service Manual

1. The bell does not ring.
When the PAGE SW of
the base is pressed, does
the ringer on the handset ring?
OK
When the TEL SG is joined
with the base to made bell
signal, does PIN 4 of BU4
change from high to low.
OK
By using voltmeter check BU2
of base.

TROUBLESHOOTING HINTS

NG
See 2, The bell does not ring
& page does not ring.
By using voltmeter check
NG
BU4.
Check TEL network primary
NG
OK
circuit.
BU2 is defective.
16
NG
BU4 is defective.