Check
Procedure
References
Refer
to
the
corresponding
check
procedure
.
Each
check
procedure
is
numbered
the
same
as
in
Figure
4-8
for
quick
reference
.
Check
1,
DC-DC
Converter
Output
V
oltage
1.
Remove
the
cover
referring
to
\Cover
Removal"
in
Chapter
3.
2.
Turn
on
the
4339B .
3.
Using
a
multimeter
,
check
to
see
if
the
voltages
between
the
test
pads
(TP
s),
shown
in
Figure
4-9,
on
A1
Main
Board
Assembly
are
in
the
ranges
listed
in
T
able
4-1.
4.
If
passed,
proceed
to
\Check
2,
LCD
Displays
Anything?",
otherwise
proceed
to
\Check
10,
Fuse
and
Line
Switch
".
Figure
4-9.
DC-DC
Converter
Output
V
oltage
Check
T
able
4-1.
DC-DC
Converter
Output
V
oltages
(Connected)
T
est
P
ad
(+)
T
est
P
ad
(0)
Range
9
(\+5")
8
(\GND")
5.160.2
V
7
(\+12")
5
(\COM")
1260.6
V
6
(\012")
5
(\COM")
01260.6
V
4-12
T
roubleshooting
