User Manual

AS4000 Operations and Maintenance
Section
605-0000-431
5
. Issue 1.6. Date3/2/99
Page 5 of 8 © Copyright Airspan Communications Corporation 1999
Fault Finding Type 1 PSU
Start
Connect
test telephone
to socket
DLP-021
Is DC
Voltage Present
TB1& 2?
Check AC
Mains Plug
is connected
and switched
on.
No
a)Check supply
fuse
b)Change PSU
No
Check Drop Cable
connections at
PSU and CRU.
Yes
Yes
Yes
Finish
Yes
Is
reported fault
Ringer Fail
?
See DLP-016
Check NTU
and wiring
If OK
change CRU
is
sidetone
present
?
Yes
is
dial tone
present
?
Make test call
on both lines
Calls
successful
?
Change
customers
telephone
No
Yes
No
Yes
No
Replace/repair
cable as required
See DLP-020
Check level of received signal
by measuring AGC Volts at CRU
using breakout test cable
See DLP-020
is
PC volts
OK
?
No
Check level of transmitted signal
by measuring PC Volts at CRU
using breakout test cable
is
AGC volts
OK
?
No
Change and
Commission new
CRU
is
AGC volts
OK
?
No
Check for
obstructions
in radio path
Pan CRU
Yes
Yes
See DLP-020
See DLP-016
to DLP-020
Is Cable OK ?
No