Synchronization CCA (reference only)

This board has been replaced by the Scanner Shield CCA.

Download Synchronization CCA Eagle & Gerber Files (10 Mar 2015 release)
(current as of 29 Jul 2015)

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The Synchronization CCA is meant to keep the polygon mirror speed at an exact lowered-ratio with the H-Sync pulses coming from the graphics card/MixAmp CCA.

A rough simulation of the Sync CCA can be viewed here.

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A simplified block diagram of the Sync board (PDF): synchronization_cca_block_diagram.pdf

The schematic / detailed block diagram can be seen here (click to enlarge):

Version 6/10 Mar 2015

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First thing to do is to get an oscilloscope and plug in channel 1 into TP - CIN and the oscilloscope ground into one of the green test pins. Channel 2 should be plugged into TP - SIG with the ground clip hooked nearby. Zoom in on the square waves and set the square waves to channel two on the oscilloscope.

The voltage levels should be from 0 - 5 volts. If the board is not locked, see documentation of the Mark IV on how to do so.

Now we will test the other probe points. TP - HSYNC will should look as follows

TP - Photo will look as follows

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TP - PLL will look as follows

TP - LF will look as follows

TP - POLY will look as follows

Next we will show the outputs of the test points on the two hex points. 1st hex should look as follows

The 2nd hex should look as follows