Check
12,
DC-DC
Converter
Open
Output
V
oltages
1.
Turn
o
the
4339B .
2.
Disconnect
the
DC-DC
Converter
Output
Cable
shown
in
Figure
4-13
from
connector
\J12"
on
the
A1
Main
Board
Assembly
.
3.
Turn
the
4339B
on.
4.
Using
a
multimeter
,
check
if
the
DC-DC
Converter
open
output
voltages
on
the
output
connector
pins
shown
in
Figure
4-13
are
in
the
ranges
shown
in
T
able
4-2.
5.
If
passed,
replace
the
A1
Main
Board
Assembly
,
otherwise
replace
the
DC-DC
Converter
Assembly
.
Figure
4-13.
DC-DC
Converter
Output
Connector
T
able
4-2.
DC-DC
Converter
Open
Output
V
oltages
Pin
(+)
Pin
(0)
V
oltage
Range
1
2
5.1
60.2
V
4
3
12
60.6
V
5
3
012
60.6
V
T
roubleshooting
4-17
