User Manual

AS4000 Operations and Maintenance
Section
605-0000-431
4
. Issue 1.6. Date3/2/99
DLP-012
Page 44 of 44 © Copyright Airspan Communications Corporation 1999
Maintenance Clear Strategy
Yes
No
Switch supply on.
Switches are located
on combiner shelf
is
supply
switched
ON
Yes
Check DC input
with DMM.
Block located
on combiner shelf
is
DC input
OK
The problem is not
DC input fail. Check rack
for other alarm indications
and deal as appropriate
Check Main fuses
in Suite Distribution
Board
Yes
No
No
Start
STEP PROCEDURE
Observe full ESD precautions.
1. Check that the two switches located in the lower right of the combiner shelf are
switched on (UP).
2. If the Combiner Shelf PSUs all indicate fail then one of the DC inputs has failed
If both supplies are gone the shelves will show no indications but the rack alarm will
still be present.
3. Check that both of the Exchange DC supply is present by measuring the input
voltage across the DC connection block (located besides switches) with a DMM.
The voltage measured should be -21v to -60vDC. If the voltage is not present check
the Suite Distribution Board fuses, and cables. Repair as required.
4. If DC supplies are present check for other alarms on shelf and deal as appropriate.
STOP. THIS PROCEDURE HAS BEEN COMPLETED.