Epson Scan 2500 service manual Carriage Operation, Carriage Movement

EPSON Stylus Scan 2500 Revision A

2.3.2 Carriage Operation

Scanning is performed in the main scan direction (=1 line) by the CCD sensor and in the sub-scan direction (=several lines) by the carriage movement. (See Figure 2-20.)

The line-type, color CCD sensor can scan 1 line in main scan direction (parallel) to the carriage unit) by one time. When scanning next lines after the second line in sub-scan direction, CR driving moves the carriage unit, which has CCD sensor inside, and scan the other lines. The scanned data is sent to the control board. The scanned data for “n” lines and “n-1” line are processed consecutively.

Figure 2-20. Carriage Movement

The Carriage Unit slides in the sub-scan direction along the guide rail. For this sliding operation, the carriage motor drives the timing belt attached to the carriage unit by conveying the driving force through the driven pulley and reduction gear. Scanning start position is determined by CR HP sensor, which is located on the control board. Since the stepping motor is used for CR motor, carriage head position is controlled under the open loop system.

Operating Principles Scanner Principles 51