M4735A Service Manual 4-43
Internal Assemblies - Top Case
4
TIP: If the Keyscan PCA is being removed to get access to the Front
Bezel or the Display, don’t disconnect the paddle wires - after
unscrewing the two screws (step 2 below), just flip the PCA over and
lay it component side down on the underside of the Printer bucket.
f. Disconnect the two paddle wires. Remove the T10 screws that con-
nect them to the threaded inserts under the paddle holders. For now
leave the wires connected to the spade connectors on the PCA.
NOTE These T10 screws are a different length than the T10 screws used in the rest
of the unit. Keep them separate by screwing them back into the threaded
inserts by hand, and leaving them there until needed.
Figure 4-23 Keyscan PCA Connections
Small Ribbon Cable
to Display
Paddle Wires (2)Single Wire to
Power PCA
Ribbon Cable to
Control PCA
Flex
Circuits (2)
to Pacing
Keypad
Flex
Circuits (2)
to Main
Keypad
Ribbon Cable to
Energy Select
Switch
Large Ribbon
Cable to Display
Cable to IrDA PCA
Work
Surface
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