BenQ 2720S Service Guide - Page 26

Film Scanner Power Board. Block - driver

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Analog Circuit ASP ADC Bus CPU With ROM W78E516 IR BD CLOCK 16 MHz CCD Video Output Sync. ADC Clk C CCD Timing C D CCD Basic Timing ASIC CCD Basic Timing & I/O Interface Resolution Control Digital Shading Gamma Correction Halftone, LineArt SCSI slave controller & interface Aux Ports( for Motors ) Addr. Bus Data Bus SYSTEM / DATA RAM SCSI I/F Line Motor Driver (6219) Figure 5-4 Film Scanner Power Board. Block The analog circuits is used for CCD signals amplification, gain/DC offset compensation and digitizing the pixel signals. The ASIC AP2106A is used for managing the scanner including analog circuits timing, stepping motors(line motor) timing , CCD timing, RAM/ROM timing, and also SCSI 5-4 API Confidential Electrical Systems No Copy/Reproduction allowed

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ASIC
CCD Basic Timing & I/O Interface
Resolution Control
Digital Shading
Gamma Correction
Halftone, LineArt
SCSI slave controller & interface
Aux Ports( for Motors )
Analog
Circuit
ASP
C
C
D
Line
Motor
Driver
(6219
)
SCSI
I/F
SYSTEM / DATA RAM
Addr.
Bus
CCD Basic Timing
CCD Video Output
Sync. ADC Clk
ADC Bus
CPU
W78E516
CLOCK
16 MHz
CCD Timing
Data
Bus
IR
BD
With
ROM
Figure 5-4 Film Scanner Power Board. Block
5-4
API Confidential
Electrical Systems
No Copy/Reproduction allowed
The analog circuits is used for CCD signals amplification, gain/DC offset
compensation and digitizing the pixel signals. The ASIC AP2106A is used
for managing the scanner including analog circuits timing, stepping
motors(line motor) timing , CCD timing, RAM/ROM timing, and also SCSI