Nellcor N-180 Service Manual page 62

N-180 Pulse Oximeter Service Manual
10.
11.
13,
Connect transformer wiring as follows:
a. Connect black and white wires (2-pin connector) to mating
connector on AC switch portion of AC inlet assembly (item 2 in
illustration).
b. Connect blue wires to CPU PCB connector CN5 (item 5 in the
illustration).
e. Connect yellow wires to CPU PCB connector CN7 (item 4 in the
illustration).
Position AC filter ground-wire on the rear-most transformer bracket
stud (item 1 in the illustration).
If there is a green and yellow wire (item 3 in the illustration) on the
replacement transformer position the corresponding lug on the front
transformer bracket stud.
Fasten wire leads 1 and 3 to transformer bracket studs using two 6
millimeter hex nuts.
AC Filter Removal and Replacement
The AC filter is part of the AC inlet and control assembly. To remove and
replace the AC filter:
L
Gain access to the AC filter by following the instructions in this section
for gaining access to components.
To remove AC inlet assembly (that includes AC filter):
a. Remove screw holding AC inlet assembly to right side member of
the rear panel assembly.
b. Ifrequired, remove 6 mm hex nut on the rear most transformer
bracket stud (some monitors do not have a ground wire from the AC
inlet assembly to the transformer stud).
6. . Lift out left side of rear panel assembly and attached AC power
inlet and control assembly (they are attached with a single screw).
Inspect replacement AC inlet filter for a ground wire on the bottom
ground lug. If a ground wire is not soldered to the lug, solder a ground
wire to the lug (a 2-inch length of wire is included in the replacement
kit).
Position AC filter ground-wire on the rear-most transformer bracket
stud (item 1 in the illustration) while simultaneously sliding AC inlet
filter into position on the bottom assembly.
Fasten right side member of rear panel assembly to AC inlet and control
assembly.