15
The machine cuts off
the
incoming
message
The incoming message is too
long.
Maximum
recording
time
for
incoming message (ICM) is 1 or 2
minutes
No sound
Improper
cable
connection
between the microphones and
the cord wire
Make sure the cable is properly
connected or replace it
Noise
1)The
connected
cable
becomes loosen or fallen
2) The cable connection box is
effected by rust or by moisture.
1) Replace the cable line;
2) Replace the impacted cable
connection box with a new one.
The bell rings for
once only and dialing
is available.
1) Check whether the cable connection box is effected by moisture;
2) Check whether the extension phones are broken
3) Make sure the master machine is proper.
Low contrast of the
LCD
Check the setting of the
contrast level
Adjust the contrast at a proper level.
Malfunction
Insufficient power supply.
Disconnect DC adapter and external
line, then reconnect them after 10
minutes.
No Caller ID
1) No caller ID service or didn’t
apply for it.
2) Caller number is a private
one
1) apply for the Caller ID service
2) Normal
Summary of Contents for M12AB
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