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NOTE
M3500B/M5500B Service Manual
Replacement
1. Prepare the case as follows:
Clean off all adhesive residue from the case and manual door rails by
a.
rubbing the dry surface with your finger and 'rolling up' the adhesive.
Lightly scoring the adhesive with a rounded tool will aid removal.
Solvents are ineffective, as is scraping with a sharp tool.
The adhesive used is very difficult to remove. Take your time and do a thor-
ough job to ensure a correct seal with the new switches and overlay.
Clean surfaces thoroughly with isopropyl alcohol (an alcohol wipe is
b.
fine). Allow to dry completely.
2. Install the new membrane switches as follows:
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. Feed
them around the side of the Interface PCA nearest their connectors.
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 case opening.
Figure 4-28 Installing the Membrane Switches
Membrane
Switches
Top Case Assemblies
Flex Circuits to
Interface PCA
4
4-47
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