TOSHIBA FD4809
Service Manual

2. The bell does not ring & page does not ring.
Can the base and handset be connected? OK NG See 3. The base and handset cannot be connected.

Press handset DIAL key while in TALK MODE. Can key touch sound be heard from the ringer? OK

NG

When the key of the handset is NG pressed, can the pulse output at pin 2 of IC606 be seen? OK

Check IC606.

At the Q609 collector, can the NG pulse wave be seen? OK

Check R667 and Q609.

Check RINGER Y601.

When the PAGE SW of the base is pressed, does pin63 of IC4 change from high to low? OK

NG Check R105 and S1.

Check IC4 and its peripheral circuit.

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