Data General AViiON 5500 Series, Установка, расширение и обслуживание

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Preparing a replacement system board
8-6
014–002250–01
Preparing a replacement system board
Before you can install the new system board, you need to prepare
your work site, remove the computer unit cover, and attach the ESD
wrist strap as described in Chapter 4.
Then, prepare the new system board for installation as described in
this section.
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First, install the original PROM component (the component you
removed from the failed system board) on the replacement system
board as described below.
CAUTION: You must install the original PROM on the replacement system
board to access some applications software.
1. Start with step 2 if the replacement system board does not have a
PROM component installed.
If the replacement system board has a PROM component already
installed, remove that component from the replacement system
board. Using a flat–blade screwdriver, gently pry up one end and
then the other end of the component until it is loose enough to
remove by hand (as shown in Figure 8–6).
2. Examine the original PROM component to see if its connector pins
are straight.
Angled pin Spread pins Straight pins
3. If the pins are spread too far apart or angled incorrectly, straighten
the pins as follows.
Lay the PROM component down on one side on an ESD–free table,
and carefully roll the component to bend the pins into line as shown
in Figure 8–7. Once the pins are in line on one side, repeat this
procedure with the other side of the component.
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Figure 8–7 Straightening the pins on the PROM component