TOA Electronics TOAEXES-5OOO Manuel d'utilisateur télécharger pdf (Page 5)

8-2. HOW TO FIND SHORT BETWEEN T-LINE AND R-LINE

If the shorted condition between T-line and R-line is not

corrected for a long time, it may burn out the guard re-

sistor (330 , 1/2W) on the LMU board. Therefore, find

the shorted line according to the following procedure:

1. Turn off the privacy switch on all stations in the

system.

2. Turn on the power switch of the system for several

seconds, then, turn it off.

3. Watch the lamps on the LMU panels. The lamps on

normal lines will go off after approximately 0.5

second. The lamps on the shorted lines will stay

on more than 0.5 second.

Normal

Abnormal

(Short)

Lamp goes off gradually

Power ON

Lamp ON

(Brighter than normal)

OFF

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TOA Electronics TOAEXES-5OOO Manuel d'utilisateur Page 5