LFE 2000 Series - Page 47

958_]I
REV
B
4.3.6
iA
ANAL0G
oUTpUT
This
modification
provides
an
isolation
circuit
and
separate
isolated
porrer
supply.
The
isolation
PCB
and
other
parts
needed
to
make
this
modification
are
contained
i-n
kit
lB2l-
122'
0n1y
one
412o
nA
anatog
output
may
be
rsolated
with
thrs
modification'
This
modification
may
not
be
added
to
controrlers
with
digrtar
communications,
input
isolation,
self-powered
4/20
nA
input,
bridge
transducer
rnpur
or
remote
start/stop
option.
Remove
the
Input/Output
(I/0)
and
cPU
boards
frorn
the
electronic
assembly
and
the
Mother
board
from
the
bezel
assembly
per
instruction
in
sections
l.g
and
l.l0
and
rnake
the
following
changes.
(LFE
p/N's
in
brackets.
)
l.
ADD
center
board
connector
p3
(345_764)
to
ttother
board
(not
needed
if
unit
already
has
center
board
connector
installed).
Reassernble
the
Mother
board
rnto
the
bezel
assembly.
2.
SOLDER
rhe
stripped
end
(237e-197
) .
of
the
black
lead
assembly
i-n CpU
board
hole
Al5
SOLDER
the
stripped
end
Al6
(
2379-216)
,
SOLDER
the
stripped
end
(2379-201).
of
the
black/white
lead
assembly
in
CpU
board
hole
of
the
green
(ANAI
)
or
Rl00
lead
assernbly
in
CpU
board
hole
Al7
(
3.
REMOVE potentiometer
Rl0l
REMOVE
R38,R4I,R42
(ANAi
)
OPEN
foil
bridges
J5,
J7
,
or
R29,R30,R58
J9
(ANAI
)
or
J2
I/0
board.
I/0
board.
3
(ANA2)
on
I/0
J3,
Jl2,
Jl4
(ANA2
)
(
ANA2
)
on
on
6.
8.
J11,
Jl
or
Jl,
board.
(ANA2
)
on
q
10.
11.
12.
13.
t4,
SHORT
solder
bridge
J4,
J6,
Jg,
JlO
(ANAI)
I
/0
board.
ADD
resrstor
1000
114
W
57,
(1g46-12)
R39
ADD
capacitor
.002UF
(305-439)
C7
(ANAI)
S0LDER
green
wire
lead
center
isolation
board.
CUT
off
blue
lead
frorn
from
I
/0
board
I
/O
board
SOLDER
red
wire
lead
from
center
or
I/O
board
A7
(ANA2).
SOLDER
white
wlre
lead
fronr
cenrer
(ANAI)
or
I/O
board
A9
(ANA2).
A8
(ANA2)
to
Al8
of
45
(ANAI
)
only.
rsolation
board
A25 to
CPU
board
A7
(ANAl
)
rsolation
board
A24
to
CPU board
A8
(ANAI
)
or
R33
or
C24
(ANA2)
Ab
(ANAI
)
or
(ANA2)
on
I/0
board.
on
IIO
board.
15.
CONNECT
the
black
lead
from
the black/whrte
lead
from
the
green
lead
from
the
CpU
16.
ASSEMBLE
rear
ends
of
pCB's
supplied
1n
the
kit.
(see
LFE
Instruments
Division
the
CPU
board
to
center
board
pin
the
CPU
board
to center
board
pin
board
to
center
board
pin
A3.
together
using
new
shorter
spacers
Firure
1-1
)
.
-40-
AI.
CONNECT
A2. CONNECT
and
hardware