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IP LDK-20 Installation Manual
SECTION 7. TROUBLESHOOTING
PROBLEM
System power failure
System does not
operate
DKTU does not
operate
SLT does not operate
CO line operation
ISDN board does not
operate
Noise
on
External
Paging port
Distorted External
MOH
CAUSE / SYMPTOM
Power short circuit in
some board(s)
LD6 LED light on the MBUB
is OFF or blinking
Power short circuit in
some board(s)
Bad board connection
System database broken
Bad extension circuit
Bad connection between
the MBUB/DTIB and keyset
The
limit
of
installation
distance
Bad keyset
Bad MBUB or SLIB board
Bad connection between
the MBUB/SLIB and SLT
ACNR Fail
Bad connection
The position of switch
Network problem
Induced noise on the wire
between the system and the
amplifier
Excessive input level from
external music source
SOLUTION
Exchange the malfunctioning board for one in good working
condition.
Dust each board.
Check the PSU fuse.
Replace the PSU with the appropriate type.
Check the connection of each board with MBUB.
Press the Reset button.
Check the PSU.
Check the short circuit on MBUB or other boards.
Press the Reset button when the DIP switch (for database
protection) is in the default position.
Exchange the malfunctioning board for one in good working
condition.
The connection between the system and the keyset must
be repaired.
Check the connection between the line of SLT and DKT on
the MDF, and fix any mismatching.
Check the distance between the MBUB/DTIB and keyset.
Plug the keyset into another extension port that has been
verified as working.
If the keyset does not work, replace the keyset.
Exchange the board for one in good working condition.
Check that the board connection between the lines of SLT
and DKT on the MDF, and fix any mismatching.
Check the PRCPTU4, and CPCU4
Check the connection.
Check the switch for term and So/To position
Check the Network.
Use a shielded cable as the connection wire between the
system and amplifier.
A short shielded cable is recommended.
Decrease the output level of the external music source by
using the volume control on the music source.
74
Troubleshooting
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