System Overview
Samsung Electronics
Service Manual
3-5
3.2 Engine H/W Specification
1) Recording Method : LSU(Laser Scanning Unit)
2) Printing Speed : 20ppm
(In continuing printing base Letter, printing pages from 2nd to last during 1min)
3) Recording Density : 600 dpi
4) Cassette Capa. : Cassette ; 150sheets(75g/ Base), 1-sheet Feeding : N/A((DRIVE Selection : Paper, OHP,
Envelop - 1 sheet)
5) Manual Tray : All paper 1 sheet
6) Paper Size : Cassette ,Manual ; Width = 76 ~ 216mm, Length = 125mm ~ 356mm
7) Effective recording size
- A4 :202 x 291 mm
- Letter :208 x273mm
- Legal : 208 x 350 mm
- Folio : 208 x 325 mm
- TopMargin: 2 2 mm
- Left, Right Margin : 2
2 mm
8) CRU(Toner Cartridge)Life : 3,000pages Printing(A4, ISO 5% Pattern Printing)
9) First Print Out Time : within 11sec ( Standby )
10) Warming up time : within 35sec (Ambient : 25 °C)
3.2.1 Main Board Control Part
Main control part of SCX-4521F is made of ASIC(CPU, Image processor, PC I/F part include, Scan interface part,
FAX Modem part and Printing process I/F part. CPU handles the BUS control, I/O interface, scan interface, PC
interface and other miscellaneous driver circuit.
1) Main Board
- Main Board has a function of sending Current Image Video Data to LSU of the machine, controlling motor
Driving Circuit and monitoring Paper Exit Sensor, Cover Open switch, OPE Panel Inputs.
2) Main Controller
- CPU : Chorus2 is the main CPU and is made up on the 16/32bit RISC architecture using ARM7TDMI
core. Main CPU controls the whole system according to the program code which stored in the
Flash-ROM memory.
- Summary of the Key Function Block:
1.8V for internal Core, 3.3V for I/O Pad with 4KByte Cache.
Image Processor included.
On-Chip clock generator with PLL.
Memory and External Bank Control.
DMA Control (5-Channel)
Interrupt Control.
2-port USB Host/1-port USB device(ver 1.1) interface control.
Parallel interface control.
UART(2-Channel)
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