Toshiba FT-3808BK, Service Manual

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18
4. Can’t make a phone call (pulse)
NG
OK
NG
OK
5. Can’t make a phone call (Tone)
NG
OK
NG
OK
NG
OK
NG
OK
Can the base and handset be
connected ?
Can the base and handset be
connected ?
See 3, the base and handset
can’t connect.
See 3, the base and handset
can’t connect.
While in Talk Mode press
dial key of the handset, can
pulse feedback be heard
from the handset receiver.
While in Talk Mode press dial
key of the handset, At PIN 7 of
BU5B of the base can the tone
wave output be seen.
Check the base TEL-Line
network primary circuit.
Check the base TEL-Line
network primary circuit.
By using voltmeter, check
base BU7.
Check around PIN3-8 of
BU5.
At PIN18 of BU6 of the base
can the Tone wave output be
seen ?
At PIN3 of BT1 of the base,
can the Tone wave output be
seen?
Check around PIN18-22 of
BU6 and surrounding
circuit of BU6.
Check the base BQ17 and
surrounding circuit of
BQ17.