Internal Assemblies - Top Case
4-42 Removal and Replacement
Keyscan PCA
The following sections describe how to remove and replace the Keyscan
PCA.
Preparation
1. Save the configuration.
If possible, save the customer’s configuration onto a Data Card (or print
the configuration) so the configuration can be restored after the repair is
complete.
2. Open the case safely.
See "Opening the Case" on page 4-24.
3. Disconnect and remove the Control PCA.
See "Control PCA" on page 4-36.
4. Remove the Shield Plate.
See "Shield Plate" on page 4-40.
Removal
1. Disconnect the Keyscan PCA (12 cables).
TIP: Position the M4735A with its handle hanging off the edge of your
work surface. See Figure 4-23.
a. Remove the large ribbon cable. See Figure 4-23 on page 4-43. Its
other end has already been disconnected from the Control PCA. Note
the position and location of the bend in the ribbon cable.
b. Disconnect the four keypad flex circuits. Unlatch the white
receptacles on the PCA by pulling upward on the top of the
receptacle, then slide out the flex circuit.
Note that two flex circuits (to the Pacing Keypad) are routed around
the top edge of the Keyscan PCA, and two flex circuits (to the
Main Keypad) are routed around the lower edge of the Keyscan PCA.
NOTE If the Pacing option is not installed, there will be only two flex circuits.
c. Disconnect the IrDA break-off PCA. Press on the connector latch to
release it.
d. Disconnect the Energy Select Switch. Press on the connector latch to
release it.
e. Disconnect the two display ribbon cables. The larger ribbon connec-
tor has latches on the ends of the connector; press them out and down
to release the connector. The smaller connector has no latch - just
wiggle gently from side to side while pulling it out.
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