Xerox Phaser 3200MFP Service Manual page 171

• Interrupt Control.
• 2-port USB Host/1-port USB device (ver 1.1) interface control.
• Parallel interface control.
• UART(2-Channel for PE220, 1-Channel for Phaser 3200)
• Synchronous Serial Interface Control.
• A/D Converter(10-bit, 2channel for PE220 and 8channel for Phaser 3200).
• General I/O Port control.
• Tone Generator.
• RTC with calendar function.
• S/W Assistant function (Rotator)
- Flash Memory: Stores system program and can be updated to the newer system program
code through the PC interface. It stores the FAX Journal List, One Touch dial number, speed
dial number, and machine configuration setup data.
• Capacity: 2 Mbyte (PE220) / 16Mbyte (Phaser 3200)
• Access Time: 70 nsec
- SDRAM: Used as a Print Buffer, Scan buffer, ECM Buffer and system working memory.
• Capacity: 16 Mbyte (PE220) 32Mbyte (Phaser 3200)
• Access Time: 66MHz based on system bus clock (PE220) 166MHz Max (Phaser 3200)
• Data Backup: 72 Hours (PE220) 48 Hours (Phaser 3200)
• Backup Battery Charging Time: 100hours when completely discharged.
Scanner
1. Image Signal Input
- Image Signal from CIS has a level of about 1.2V and it goes to ADC of the main PBA.
After passing through the ADC, the CIS analog signal will be converted to an 8-bit digital sig-
nal.
2. Image Processing
- The surface of a printed paper reflects CIS LED light and is sensed by the CIS Sensor.
The light is converted to the appropriate voltage suitable for ADC input. Analog signals from
the CIS sensor is used for ADC input is then converted to 8-bit digital data. The image pro-
cessor will perform a shading correction function, Gamma correction function is done next.
The data then goes to different modules according to the copy or FAX resolution mode. While
in Text mode, the image data goes to the LAT module. In Photo mode, the image data goes to
the Error Diffusion module. In PC-Scan mode, the image data goes directly to the PC through
DMA access.
Phaser 3200MFP / Workcentre PE220
General Procedures and Information
04/07 6-15