Replacing
the
A2
CPU
Board
Assembly
The
A2
CPU
Board
Assembly
has
a
ROM
for
the
rmware
and
an
EEPROM
for
the
adjustment
data
and
user
data.
Both
ROM
and
EEPROM
are
mounted
in
sockets
for
easy
replacement.
If
the
A2
assembly
is
replaced,
the
ROM
and
EEPROM
may
be
transferred
from
the
defective
assembly
to
the
new
assembly
as
long
as
the
ROM
and
EEPROM
are
not
defective
.
The
ROM
transfer
reduces
parts
cost
for
the
repair
,
and
the
EEPROM
transfer
saves
time
from
readjusting
the
4338B .
F
or
this
purpose
,
the
A2
assembly
can
only
be
ordered
without
the
ROM.
When
the
A2
assembly
is
replaced,
make
sure
that
the
jumpers
and
switches
on
the
A2
assembly
are
in
the
default
position
as
shown
in
Appendix
B.
Replaceable
Assembly
List
The
replaceable
electrical
assemblies
are
listed
in
T
able
3-1
and
T
able
3-3.
3-2
Assembly
Replacement
