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82 Maintenance and Service
S
ection 5: Maintenance and Service 6888Xi Advanced Electronics Instruction Manual
December 2012 PN 51-6888Xi
Re
plac
i
ng a
n E
x
i
sti
ng I/O
Boa
rd
1. L
o
os
en the four s
crews s
ecur
in
g
the 6888X
i cover. The s
crews a
re cap
tive a
n
d
do
not need
to
b
e com
ple
t
ely removed
.
2. S
win
g
the 6888X
i cover down to
ex
p
os
e the inner co
m
p
onents.
3. Disconnect the 10-pin ribbon cable from the I/O Board. A new cable is supplied in the
rep
la
cemen
t kit and should be used if the old one is damaged.
4. Tag and disc
o
nne
c
t wiring for Alarm Outputs, Flame Status Input and/or SPS/IMPS as appli
-
c
able.
5. S
lide the
I/
O Board part way out of the 6888Xi enclosure.
6. D
isc
o
nnec
t the
4-position plug for the transmitter probe and output wiring. Remove the I/O
Board comp
letely from the 6888Xi enclosure.
7. See Figure 5-3. Set jumpers JP1, JP2, JP5, JP7 and JP8 to their proper positions using the old
I/
O Board as a guide.
8
. Set switch SW4
to
their proper positions using the old I/O Board as a guide.
9. Partially slide the new I/O Board into the 6888Xi enclosure. Ensure the board is correctly
aligned within the slots in the enclosure.
10. Connect the 4-position plug for the transmitter probe and output wiring. Slide the I/O
Board completely into the 6888Xi enclosure.
WARNING
If the existing I/O Board has been operated with enhanced software features, these features must be
activated in the new board before the 6888Xi Electronics is put back into service. Failure to do so will
cause a false analog output signal to the DCS.
6888Xi
6888Xi
6888Xi
6
888Xi
FIGURE 5-3. I/O Board Jumper & Switch Settings