PI331MC-DR Datasheet, PDF (8/9 Pages) AMI SEMICONDUCTOR – 300DPI CIS Two Level Digital Output Module

Adjustments
General Location of Test, Adjustment and Monitor Points
BACK SIDE OF THE PCB AS VIEWED ON MODULE
WITH THE GLASS WINDOW FACING DOWN.
TV
TR
R5 (GAIN ADJ) ^{R4 (OFFSET ADJ)}
TVD
CONNECTOR
VLED
GLED
PI331MC-DR PCB MONITOR AND TEST POINTS
FIGURE 5.
Figure 5, PI331MC-DR PCB MONITOR AND TEST POINTS, shows the pictorial layout of
the controls and the tests points. These adjustment potentiometers and the test points are
shown relative to the connector and to the output pads for LED light power. This is a bird’s
eye view of the PCB’s backside with the glass window of the module facing down on the
documents.
Test point labeled TV is for the analog image pixels, just as it is produced at the output of
the CIS array section, and prior to its entry into the tracking digitizer circuit.
Test point labeled TR is the output of the tracking reference level from the tracking
digitizer circuit.
Test point labeled TVD is the digital output from the comparator.
Offset adjust, R4, is a screw driver adjustment potentiometer that is accessed through
adjustment hole as it viewed in figure 5.
Gain adjust, R5, is a screw driver adjustment potentiometer that is accessed through the
hole as it is viewed in figure 5.
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