Toshiba FD-9839, Service Manual

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17
2. The bell does not ring & page does not ring.
Can the base and handset be
connected?
When the PAGE SW of the
base is pressed, does pin63
of IC8 change from high to
low?
Check IC8 and its peripheral
circuit.
When the key of the handset is
pressed, can the pulse output
at pin 2 of IC606 be seen?
Check RINGER Y601.
Check R147, R753, R758,
R443, R754, C427 and Q403.
See 3. The base and handset
cannot be connected.
Check IC606.
OK
OK
OK
NG
OK
NG
NG
NG
At the Q609 collector, can the
pulse wave be seen?
OK
Check R667 and Q609.
NG
Press handset DIAL key
while in TALK MODE.
Can key touch sound be
heard from the ringer?
Check IC402 and key circuit.
OK
Replace defective part(s).
NG