Ricoh C211 Service Manual page 301

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Next, verify that the newly installed SIMMs are, in fact, 70 ns in speed.
As mentioned in the purchase specification above, 80 ns SIMMs do not
respond quickly enough to work with the Intel CF processor in the
PCRIP-10 and can not be used!
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Check that all the newly installed SIMMs are 4 Megabyte X 8 (or 9) and
that you have not accidently reinstalled one of the 1 Megabyte X 9
SIMMs you removed.
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If none of the steps above have solved the problem, it is possible,
though highly unlikely, that one of the new SIMMs is defective. If the
SIMMs were purchased from reputable dealer or distributor, these
components should have been tested and should also be replaceable
under warranty.
18. Make sure the PCRIP-10 is turned off and that the Diagnostic Plug and
all cables are removed.
19. Make sure that the chassis lid is reattached with 8 screws--3 on each
side and 2 on the backpanel.
20. Slide the metal chassis back into the plastic housing. Be careful to line
up the two LED's on the front of the chassis with the holes cut in the front
panel of the plastic housing for them.
FSM 6-17 VT2105