Repair Procedure; Battery Replacement - HP 8340B Manual

Controller Section
Repair Procedure
BATTERY REPLACEMENT
What the Battery Does
The processor assembly
battery (A60B1) provides backup
power
to
RAM,
which holds the working
calibration data and the
SAVE/RECALL register
values.
How Calibration Data
is
Restored
If
the battery is
defective, or
is
replaced,
the calibration data and the register values are
lost. If
RAM does
lose
its information, the next time you turn the instrument on, protected calibration data
stored in
EEPROM loads
into
RAM
and the instrument displays
CALIBRATION RESTORED. Note,
however, that register values are not restored.
How
Long
the Battery
Should Last
The battery provides at least two years
of back up
power,
and has
a
shelf
life
exceeding
10
years.
It is
not rechargeable.
WARNING
Although
the battery has
a
strong outer case, do not abuse
it
mechan¬
ically, electrically, or thermally.
This battery contains
lithium and thionyl
chloride (SOCL;) and can
be
a
fire, explosion, and severe bum hazard
if
abused.
Lithium can burn or
explode
on
contact with
moisture.
Thionyl chloride
is
highly toxic. On
contact with
air,
it
partially breaks
down
into hydrochloric acid and sulfur dioxide fumes, which
are toxic,
extremely repulsive,
strongly irritating, and corrosive
to
eyes, skin,
lungs,
and mucous membranes. If
a person comes
in contact
with or
breathes this
material,
CONTACT A POISON CONTROL CENTER OR
DOCTOR IMMEDIATELY.
Do not try to charge this battery; it
may
rupture.
Do not attempt
to
open the
battery, heat
it
above
212° F
(100° C),
expose
its
contents to water, or incinerate
it.
Your local laws may require the disposal of thionyl chloride or lithium
in
a
chemical waste disposal site. You can return the battery
to:
Hewlett-
Packard,
1400
Fountaingrove Parkway, Santa Rosa, California 95401,
Attention: Environmental Engineering
Department.
Dead batteries have converted most of the lithium
and
thionyl chloride
into
not-toxic chemicals.
F-26 Controller Section Repair Procedure
HP 8340B/41B