Lexmark T640 System PCA Access

The T640 has its engine control and formatter functions combined on a single PCA, the System PCA. Proceed as follows to remove it.

1) Left Side Cover
> Two finger-operable claws at the front. Swing it open far enough and its upper hinge will pop apart harmlessly for removal.

2) System PCA Enclosure Cover
> Loosen off six M3x6mm pan head screws.
> Slide the cover forward slightly and pull it away over the screw heads.

3) System PCA w/Enclosure
> Twenty or twenty-one cable connections, depending on model.
> There may be a ty-wrap to be cut on one of the printhead cables.
> Free the cabling from the enclosure's cable openings.
> One M3x15mm hex washerhead screw at the PCA's upper rear corner.
> Three M3x10mm washerhead threading screws. They're near the PCA's three other corners.
> The item is free to come away from the chassis.

4) Option Slot(s) PCA (aka Interconnect PCA)
> Two M3x6mm pan head screws.

5) System PCA
> Five M3x6mm pan head screws: two at the parallel interface connector; one at the USB connector; two through the System PCA.
> NOTE: At reassembly, don't tighten the two screws through the System PCA until the three interface connector screws are in place and tight.

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