Samsung SCX-4720F, Service Manual, Page: 37 / 190

Summary of Product
Service Manual
4-13
Samsung Electronics
4.3.2 Memory
The SCX-4720F/4520 has Flash ROM and DRAM memory units. There are 2 SODIMM sockets to enable extra DRAM
or FlashROM (Postscript Option) to be fitted.
On Domestic 9Korean) models additional Mask ROM is also fitted: to store domestic Fonts such as PCL Font and
KS5895, KSSM etc.
- Capacity : 32MByte
- Access Time : 100nsec
4.3.3 Flash Memory
Record System Program, and download System Program by PC INTERFACE.
FAX for Journal List, and Memory for One Touch Dial, Speed Dial List.
- size : 4M Byte
- Access Time : 70 nsec
4.3.4 SDRAM
SDRAM is used as Swath Buffer in Printing, Scan Buffer in Scanning, ECM Buffer in FAX receiving, and System
Working Memory Area
- size 32MB : 32Mbyte(Basic).
- Max Frequency : 133MHz
- store Fax Receive Memory Data by using Battery
4.3.5 Battery Backup (SCX-4720F only)
Backup power is provided by a 3.6V rechargeable Lithium battery. It provides power to the SD-RAM to retain any
faxes in memory when main power is lost. Typically backup power will last up to 43 hours. The battery requires 48
hours to charge from empty.