User Manual

AS4000 Operations and Maintenance
Section
605-0000-431
5
. Issue 1.6. Date3/2/99
Page 6 of 8 © Copyright Airspan Communications Corporation 1999
Fault finding Type 2 PSU
Start
Yes
Go to
next page
entry point
1
Is
reported fault
switched to battery
or >30%
charge
?
No
Yes
is
dial tone
present
?
No
Make test call
on both lines
Connect
Test Telephone
to Socket
Calls
successful
?
Change
Customers
Telephone
No
Yes
Is
reported fault
Ringer Fail
?
See DLP-016
Is DC
Voltage Present
TB1& 2?
DLP-022
Yes
is
Yellow LED
Lit
?
No
Check AC Mains
Plug is connected
and switched on.
Check Fuse
No
Change
ACPSU
No
Press Reset
Switch S1
Check Drop Cable
Connections at
PSU and CRU.
is
fault clear
?
Yes
is
Cable OK
?
no
is
D8 and D9
Extinguished
?
No
Yes
Replace/
repair cable as required
Yes
Finish
Check NTU
and Wiring
If OK
change CRU
is
sidetone
present
?
No
Yes
Go to
next page
entry point
1