4.3.1 Precedure
(1)Turn on power switch on the exchange.
(2)Adjust the sound level of the external PA paging and check the power remote function.
(a)Connect one station.
(b)Press buttons 
and 
to test the sound level. Adjust the volume control of the external amplifier.
(3)Complete a speech test with each of the other stations.
(a)Connect the plug for the station to be tested.
(b)Dial the station number. Check the sound level and the speech quality.
(c)Dial 
and 
. If a howling noise is heard, then the paging or speaker stations are too close together.
(4)After the speech test is completed for all stations, the sound level adjust- ment for BGM should be done. To begin, the sound level should be set
so that the BGM is heard from all stations when the power switch of the
exchange is turned on. To turn off the BGM, press the
key once.
4.3.2Adjusting Method
(a)If exchange does not work:
(1)Turn off the power and disconnect all units from the mother board.
(2)Turn on the power and check the DC voltage at the points on the mother board illustrated below.
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