Check
Procedure
References
Refer
to
the
corresponding
check
procedure
.
Each
check
procedure
is
numbered
the
same
as
in
Figure
4-9
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
4338B .
3.
Using
a
multimeter
,
check
to
see
if
the
voltages
between
the
test
pads
and
the
ground
(TP500),
shown
in
T
able
4-1,
on
A1
Main
Board
Assembly
are
in
the
ranges
shown.
4.
If
passed,
proceed
to
\Check
2,
LCD
Displays
Anything?",
otherwise
proceed
to
\Check
9,
Fuse
and
Line
Switch
".
Figure
4-10.
DC-DC
Converter
Output
V
oltage
Check
T
able
4-1.
DC-DC
Converter
Output
V
oltage
(Connected)
T
est
P
ad
(+)
T
est
Pin
(0)
Range
\+5
V"
500
5.160.2
V
\+12
V"
500
1260.6
V
\012
V"
500
01260.6
V
T
roubleshooting
4-13
