Agilent Technologies 339B Service Manual

Check
2, LCD
Displays Anything?
1.
Turn o
the
4349B
.
2.
Turn on
the
4349B
while
watching
the
LCD
.
3.
Check for
a
beep
sound
for
a
moment
and
if
you
see
anything
is
displayed
on the
LCD.
4.
If
beep
sounds
and
LCD
displays
something,
proceed
to
\Check
3,
LCD
Operates
Correctly?",
otherwise
proceed
to
\Check
6,
CPU
P
ower
LED
Lights?".
Check
3,
LCD
Operates
Correctly?
1.
Turn
on
the
4349B
.
2.
Reset
the
4349B
.
3.
Check
if
the
LCD's
back
light
is
lit.
4.
Press
some
front
panel
keys
such
as
4
Meas
Prmtr
5
and
check
if
the
characters
are
correctly
displayed
in
the
whole
area
of
the
LCD
.
5.
If
the
LCD
operates
correctly
,
proceed
to
\Check
4,
Any
Error
Message
on
LCD?",
otherwise
replace
the
LCD
Assembly
.
Check
4,
Any
Error
Message
on
LCD?
1.
Turn
o
the
4349B
.
2.
Turn
on
the
4349B
while watching
the LCD
.
3.
Check
if
the
LCD
displays
any
error message
.
4.
If
an
error
has
NOT
occurred,
replace
the A1
Main
Board
Assembly
,
otherwise
proceed
to
\Check 5,
CPU
Related
Error
Message?".
Check
5, CPU
Related
Error
Message?
1.
If the
error message
is
one
of
the
following,
replace
the
A2
CPU
Board
Assembly
,
otherwise
replace
the A1
Main Board
Assembly
.
a.
ROM
TEST
F
AILED
b.
RAM
TEST
F
AILED
c.
EEPROM
R/W
F
AILED
Note
When
replacing
the
A2
CPU
Board
Assembly
,
refer
to
\Replacing
the
A2
CPU
Board
Assembly"
in
Chapter 3
for handling
the ROM
and EEPROM
on the
A2
Assembly
.
Check 6, CPU P
ower LED Lights?
1. Turn on the 4349B.
2. Check if the LED
, \+5V" of DS1 on the A2 CPU Board Assembly lights
.Refer
to Figure 4-9
for DS1 location.
3. If the LED lights, proceed to \Check 7, Any Error Code on LED?", otherwise proceed to
\Check 8, CPU Fuse High Lead Voltage".
4-12 Troubleshooting

Agilent Technologies 339B Specifications

General

Brand	Agilent Technologies
Model	339B
Category	Measuring Instruments
Language	English