HP 8340b User Manual

3.
All
LEDs
and annunciators
should
light
and
remain on
as
long
as
you
press
[INSTR
PRESET].
4.
If
any
LED
or
annunciator
fails
to
light,
use
Figure
G-2
to
identify
the
appropriate
assembly.
ALPHANUMERIC
DISPLAY
TEST
1.
To activate
the
display
self
test
diagnostic
mode,
press
[SHIFT]
[FREE
RUN].
2.
You
should
see
the
following:
a.
For
three
seconds,
the
ENTRY
display
shows
DISPLAY RAM
TEST
PASSED
b.
For
the
next
three
seconds,
the
ENTRY
display
shows
DISPLAY CHECKSUM
=
3A.
c.
For six
seconds,
all
numeric
display
segments
light,
and
all
ENTRY
display dots
flash.
d.
The
entire
available
character
set
scrolls
across
the
displays,
and continues
to
scroll
until
the
diagnostic
routine
is
terminated
with
[SHIFT]
[M5].
3.
If
you
note
any
discrepancies,
refer to
the
A1,
A2,
and
A3
assembly-level
troubleshooting
pro¬
cedures.
KEY
AND RPG
TEST
1.
With
the
power
switch
set
to
STANDBY
(no
fan noise), check
the
mechanical action
of
each
key.
Check
for
height
differences,
unusual
sounds when
pressed,
and differences
in
the
force
required
to
depress
each
key.
2.
Check
that the
front panel
knob
rotates
smoothly.
3.
Turn
the
power
switch
on and
press
each front panel
key.
Check for
the
proper
ENTRY
display
message,
and
that
the
appropriate
LEDs
and
annunciators
light.
NOTE:
Some
keys
require
that
other keys
are pressed
first
(e.g.
the
GHz and
dBm
terminators).
4.
Press
[INSTR
PRESET] [POWER LEVEL]
and
slowly rotate
the
front
panel
knob in both
direc¬
tions.
Watch for
a
0.05
dB
increment
(clockwise) and
decrement
(counter-clockwise)
in
the
power
level.
5.
Rotate
the
front
panel
knob
rapidly
one quarter
turn
in
either
direction.
This
should
cause
a
large
change
in
power
level.
6.
If
a
keyboard has
a
problem,
disassemble
the
front panel (refer
to
FRONT PANEL
REPAIR PRO¬
CEDURES),
and
refer to
either
the
A3
processor
troubleshooting
or
the
A5
and
A7
keyboard
troubleshooting.
FRONT PANEL
CONNECTORS
1.
Examine
all
connectors
for
contamination
or
deformation,
HP 8340B/41B
Front Panel Overall
Assembly-Level
Troubleshooting
G-7

HP 8340b Specifications

General

Brand	HP
Model	8340b
Category	Inverter
Language	English