Oki B 4100 Maintenance Manual page 490

A3.11 MEMO (memory) Circuit Diagram for OKIFAX 5000 Series (option)
By mounting this optional memory board (MEM/MEM-2), it can be used for the expansion memory.
1. Block diagram
Figure A3.11.1 shows a related signal of memory board.
Memory board circuit consists of the following block.
1) 512 kbyte MOS Dynamic RAM x 4 (IC3 to IC6).
Used as follows:
•
•
•
•
2) Memory capacity
• 1 Mbyte memory board can be added for OKIFAX 5200/5300.
• One of 1 Mbyte memory board can be added for OKIFAX 5000 series.
The relationship between memory capacity and mounted boards are shown in the following
table.
Note: Back-up time on electrical interruption; Min. one hour for OKIFAX 5000 series.
40055101TH Rev.4
Picture memory for the ECM send/receive modes.
Picture memory for the memory transmission mode.
Picture memory for the retransmission data.
Picture memory for the reception in memory
Equipment Memory
Capacity
OKIFAX
1 Mbyte
5200/5300
1 Mbyte
OKIFAX
5500/5600
2 Mbyte
IC3 IC4
Mounted Mounted
Mounted Mounted
Mounted Mounted
IC5 IC6
Not mounted Not mounted
Not mounted Not mounted
Mounted Mounted
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