Table of Contents
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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 make bell
signal, is there pulse wave
on Pin 4 of IC3?
OK
Then, is there pulse wave
on Pin30 of IC2?
OK
By using voltage chart,
check IC2.
OK
Check the surrounding
circuit where the
voltage is incorrect.
TROUBLESHOOTING HINTS
NG
NG
By using voltage chart,
check IC3.
Check TEL network
primary circuit.
NG
Check IC2, R30 and R48.
NG
IC2 is defective.
— 13 —
See 2. The bell does not ring
& page does not ring.
NG
IC3 is defective.
OK
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