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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
Pin 28 of IC2 change from
high to low?
OK
By using voltage chart,
check IC2.
OK
Check the surrounding
circuit where the voltage is
incorrect.
NG
Check the base TX power.
Check the base TX data
deviation.
Check the handset RX
sensitivity.
Check RX data pulse
waveforming current
(Pin 15 of IC504).
Check R515.
NG
When the key of the
handset is pressed, can
the pulse output at pin 58
of IC503 be seen?
At the Q507 and Q512
collector, can the pulse
wave be seen?
RINGER is defective.
NG
NG
— 14 —
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
By using voltage chart,
check the base TX circuit.
Check R53, R74, R71,
R75 and R76.
Check the handset RX RF
circuit (Q501) as well as
FT501 and FT503.
Check R505, C511 and
C539.
Check IC503.
Check R556, R561, R569,
Q507 and Q512.
Check S2, R27 and R84.
IC2 is defective.
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