Check
11,
DC-DC
Converter
Input
V
oltage
1.
Turn
on
the
4339B .
2.
Using
a
multimeter
,
check
if
the
voltage
between
TP4
and
TP3
(DC-DC
Converter
input
voltage)
on
A1
Assembly
is
between
+12
V
and
+15
Vdc
.
Refer
to
Figure
4-12
for
the
test
pad
locations
.
3.
If
the
voltage
is
in
the
range
,
proceed
to
the
\Check
12,
DC-DC
Converter
Open
Output
V
oltages",
otherwise
proceed
to
the
\Check
13,
Transformer
Secondary
V
oltage
".
Figure
4-12.
T
est
P
ad
Locations
4-16
T
roubleshooting
