HP DesignJet 250C Service Manual page 62

Installing a RAM or ROM SIMM
A RAM SIMM provides the plotter with extra
memory. A ROM SIMM contains new
firmware code to override the internal
firmware code.
1 Make sure that the plotter is switched
OFF and that neither the power cord nor
an interface cable is connected.
X
2 Unscrew the cover plate at the back of the
plotter, and remove it.
or
Torx-10
6 4 Removal and Replacement
C A U T I O N
Before handling a SIMM, either put on a
grounding wrist strap and attach the end to
the metal chassis of the plotter, or touch the
outer metal surface of the plotter with your
hand. Otherwise, static electricity from your
body could damage the SIMM.
3 Take the SIMM out of its bag, holding the
SIMM only by the edges.
4 With the SIMM's small notch on the left
and the metallic edge away from you, load
the SIMM into the slot
- nearest to you (RAM SIMM)
- furthest from you (ROM SIMM)
X
To do this, first hold the SIMM at an
angle, and then gradually push it back
until it clicks vertically into place.
5 Replace the cover plate and the screws.
Flat
Notch
2
1
C4699 90000