LG LDK-20 User Manual download pdf (Page 80)

IP LDK-20 Installation Manual Troubleshooting

SECTION 7. TROUBLESHOOTING

PROBLEM CAUSE / SYMPTOM SOLUTION

Power short circuit in

some board(s)

System power failure

LD6 LED light on the MBUB

is OFF or blinking

Exchange the malfunctioning board for one in good working

condition.

Dust each board.

Check the PSU fuse.

Replace the PSU with the appropriate type.

Power short circuit in

some board(s)

Bad board connection

System does not

operate

System database broken

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.

Bad extension circuit Exchange the malfunctioning board for one in good working

condition.

Bad connection between

the MBUB/DTIB and keyset

The connection between the system and the keyset must

be repaired.

Check the connection between the line of SLIB and DTIB

on the MDF, and fix any mismatching.

The limit of installation

distance

Check the distance between the MBUB/DTIB and keyset.

DKTU does not

operate

Bad keyset Plug the keyset into another extension port that has been

verified as working.

If the keyset does not work, replace the keyset.

Bad MBUB or SLIB board Exchange the board for one in good working condition.

SLT does not operate

Bad connection between

the MBUB/SLIB and SLT

Check that the board connection between the lines of SLT

and DKT on the MDF, and fix any mismatching.

ACNR Fail Check the PRCPTU4, and CPCU4 CO line operation

Bad connection Check the connection.

The position of switch Check the switch for term and So/To position ISDN board does not

operate

Network problem Check the Network.

Noise on External

Paging port

Induced noise on the wire

between the system and the

amplifier

Use a shielded cable as the connection wire between the

system and amplifier.

A short shielded cable is recommended.

Distorted External

MOH

Excessive input level from

external music source

Decrease the output level of the external music source by

using the volume control on the music source.

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LG LDK-20 User Manual Page 80

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