Internal Assemblies - Top Case
4-36 Removal and Replacement
Control PCA
The steps below describe how to remove and replace the Control PCA. The
Control PCA contains the unit’s operating software, including the data for the
voice prompts. All Control PCAs are American English, part number
M4735-68100. Installing a new Control PCA requires the use of the
Language Support Tool to set the Control PCA to the correct language. See
Table 5-2 on page 5-8 for part numbers.
NOTE Simply removing and replacing the existing Control PCA does not require the
Language Support Tool.
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.
Removal
1. Disconnect the Control PCA (Five Cables).
a. Disconnect the large ribbon cable on the left side of the Control PCA
(connects to the Power PCA). See Figure 4-20 on page 4-37.
b. Disconnect the smaller ribbon cable on the left side of the Control
PCA (connects to the Parameter PCA).
c. Disconnect the small ribbon cable at the rear of the PCA (connects to
the printer). This requires releasing latches on the ends of connector.
Push the latches out and down to release them.
d. Disconnect the small 2-wire connector at the front edge of the PCA
(connects to the speaker). This connector has a latch on the top. Push
down on the latch to release it and wiggle the connector side to side to
pull it out.
e. Disconnect the large ribbon cable on the right side of the Control
PCA (connects to the Keyscan PCA).
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