Toshiba FD-9839 Service Manual page 16

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