Ricoh C211, Service Manual

Page: 298 / 769

6.8 RAM UPGRADE PROCEDURE
The RAM in the PCRIP-10 consists of four (4) - 1 Megabyte by 8 (or 9)
Single-Inline-Memory-Modules (SIMMs) running at 70 nanoseconds. A SIMM
consists of a very small (appr. 3/4" inch by 3 1/2" inches) printed ciruit board
(PCB) with 30 contact fingers which plug into sockets on the main board of
the PCRIP-10. Dynamic RAM memory chips which are soldered on to this
small PCB can communicate with each other through the wiring in the board
and with the main board through the 30 contact fingers. The actual physical
number of DRAM chips installed on the SIMM can be either 2 or 8 for 1 Mb x
8 (3 or 9 for 1 Mb x 9) depending on the density of the chips. (See Figure 1.)
Figure 1 - SIMM
"1 Megabyte X 8" (or 9) describes a SIMM with 1 Megabyte usable storage
which sends data out 8 bits (or 9 bits) at a time.
"70 nanoseconds" describes how fast the memory can respond in billionths
of a second to commands from the Intel CF processor chip on the main
board of the PCRIP-10.
HOW TO UPGRADE RAM TO 16 MEGABYTES
To upgrade the PCRIP-10 to 16 Megabytes of RAM from the factory
standard, contact either a local computer dealer or an electronic component
distributor about purchasing parts with the following description:
Four (4) - 4 Megabyte X 8 (or 9) SIMMs with 30 contact fingers running at 70
nanoseconds (ns)
While SIMMs of this variety are available in both 70 and 80 ns speeds, BE
CERTAIN TO PURCHASE ONLY SIMMS WHICH RUN AT 70 NS ! Due to
the high speed of the Intel CF processor chip, SIMMs running at 80
nanoseconds will not work in the PCRIP-10.
NOTE: Please take appropriate precautions for preventing static discharge
throughout this procedure.
1. Turn off and disconnect all cables to the PCRIP-10.
2. Slide the metal chassis of the controller from its plastic housing.
VT2105 6-14 FSM