Campbell CR10 PROM Replacement Procedure page 6

CR10 PROM Replacement Procedure
9999 ObjSlNo
PROM
6174 ItemNo
1986
C
FIGURE 6. CR10 CPU Board
Oriented so that the Connectors are on
the Top of the Drawing
1 2
FIGURE 7. Removing the PROM
with a Screwdriver
FIGURE 8. Inserting the
New PROM
4
App. Note: 1D-T
10. See Figure 6 to locate the PROM on
the CR10 CPU board. The installed
PROM has a notch on the left side
when the CPU board is oriented as in
Figure 6. The replacement PROMs
must also be installed with the notch
on that side.
11. Use a PROM puller to remove the
PROM. If you don't have a PROM
puller, use the less elegant procedure
described below:
a) Insert the end of a small flat-blade
screwdriver underneath the
PROM, then gently rotate the
screwdriver to slightly lift the
PROM from the PROM socket (!
on Figure 7).
4
b) Gently pry up the end of the
3
PROM to about 1/8" off the
socket (" on Figure 7).
c) Move the screwdriver to the
other end of the PROM and per-
form the same procedure (# and
$ on Figure 7).
d) Alternate prying the PROM from
either end. Lift the PROM
approximately 1/8" with each
pry until the pins clear the sock-
ets and the PROM can be lifted
out of the socket.
12. Hold the new PROM by either end as
shown in Figure 8. Position the
PROM over the sockets with the cir-
cular notch on the end of the PROM
oriented the same direction as the sur-
rounding PROMs.
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