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3.
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3.4.8.3 When the Tone Is Not Heard
The method to solve the problem when the tone is not heard in the 16SLI2/16MWSLI port
is as follows:
Replace SLAC(58Q021).
No
Yes
No
Yes
No
Yes
- Check PIN2 and PSU of LE79555.
- ee descriptions of ‘4.5.2 When the
Power Is Not Supplied’
.
Check LE79555 and Ring Generator.
No
Yes
No
Yes
Repair the highway of the MP40
board and the mother board.
Check the voltage
between TIP-RING.
End
Is the voltage -30
V or more?
Is HOS detected?
Check if the HOS(CD1) signal
of U10 becomes ACTIVE.
Check if the tone signal is
generated in PIN22 of 58Q021.
Replace CODEC
Is the Codec Control signal
generated?
Is the signal generated
from HWR?
Check U13(CPLD).
Is the tone generated?
- Check the related signals.
(Clock, Address/Data Bus)
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