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M3500B/M5500B Service Manual
Feed the 2 flex circuits down through the slot in the case as shown in
a.
Figure 4-28. Slide the smaller one in first, then the larger one.
Peel the backing material off the new switches. Handle very carefully
b.
and touch the adhesive as little as possible.
Starting with the top edge, align the switches very carefully in their
c.
recess in the case and roll them down slowly into place. Be careful
not to kink the flex circuit tails as you slide them into their slot under
the switches.
Press firmly all over, especially the edges, to adhere the new switches
d.
into place and seal the opening in the case.
3. Do not install the rubber overlay on the switches at this time.
4. Replace and reconnect the Interface PCA as follows:
Replace the Interface PCA into position, snapping it under the
a.
retainer clip and replacing its screw.
Guide the IRDA PCA back into position. Be careful to get the ambi-
b.
ent light sensor into the notch in the end of the light conducting tube.
Install the 2 screws in the IRDA PCA.
Replace the Manual Door shaft and rails into position. Install the 4
c.
screws from the top side of the case into the Interface PCA and
tighten.
Reconnect the 2 flex circuits from the Manual keypad to the Interface
d.
PCA. Do not twist them.
Reconnect the 3 flex circuits from the Main keypad to the Interface
e.
PCA.
Reconnect the large ribbon cable to the Control PCA and replace its
f.
metal bail.
Carefully connect the SpO
g.
Connect ECG connector to Interface PCA, being sure ECG cable is
h.
above SpO
flex circuit.
2
5. Reconnect the rest of the unit as follows:
Replace the plastic insulating shield over the SpO
a.
PCAs. Align the hole in its wide end over the case post. Slide the left
edge of its narrow end under the lips on the metal retaining clips on
the ECG and SpO
2
original tape, or use other plastic electrical tape.
Replace and reconnect the Control Stack. See "Control Stack" on
b.
page 4-33.
flex circuit to the Interface PCA.
2
connectors. Secure the shield to the clips with the
Top Case Assemblies
and Interface
2
4-53
4
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