Oki B 4100 Maintenance Manual page 424

A3.2.15 M17 Circuit Diagram (Page 16/17)
1. Block diagram
The circuit diagram shown on page 16/17 consists of the following functions and connectors:
• RAM3 to RAM5
Figure A3.2.22 shows the block diagram of DRAM.
2. Function
1) PSRAM
2 MByte DRAM x 1 (RAM3) for ODA version
512 KByte DRAM x 2 (RAM4 and RAM5) for INT'L version
• Used as follows:
A1 - A10
DRAS1-N
DWRL-N
DCASH-N
DCASL-N
40055101TH Rev.4
Picture memory for the ECM send/receive modes.
Picture memory for the memory transmission mode.
Picture memory for the retransmission mode.
Picture memory for the reception in memory.
Editing for report printing.
A1 - A19
A1 - A10
A1 - A18
Figure A3.2.22 Block Diagram of DRAM
RAM4
AD08 - AD15
PSRAM
512kByte
RAM5
AD0 -
AD07
PSRAM
512kByte
RAM3
AD0 -
AD03
DRAM
2MByte
AD0 - AD15
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