C11T- MULTIFUNCTION CNC BOARD Rev. 2 - CNC4PC

C11T (Rev. 2.1) User ManualPOSSIBLE CAUSE- The EN terminal (Enable Outputs) isnot enabled. The board requires to beexternally enabled.- The parallel cable is not wellconnected to the PC parallel port.POSSIBLE SOLUTIONS- Make sure you are providing +5vdc tothe EN terminal. This +5vdc can betaken from the terminal next to it.- Check if the parallel port is wellconnected to the PC.SYMPTOM 3: THERE IS NOISE IN THE SYSTEM, OR THE MOTORS DO NOTMOVE SMOOTHLY.POSSIBLE CAUSEPOSSIBLE SOLUTIONS- The board could be underpowered. - Make sure you are using a +5vdc1500mA power supply.- There could be a short that could bedraining the power to the board.- There could be an external noisesource that could be introducingnoise into the system.- Check that there are no hot spots in theboard or it’s connections.- Measure the board’s powerconsumption, it should be less than400mA (depending on the featuresused).- Blown chips could create an internalshort and end up drawing power that canaffect how other chips work.- Try using shielded cables.- Try to isolate VFDs or AC servos, etc.- Try using 103. 0.1mF caps between theI/O terminal and a ground of the board.SYMPTOM 4: A I/O PIN MIGHT NOT BE WORKING.POSSIBLE CAUSEPOSSIBLE SOLUTIONS- A chip may have gone bad. Thesebuffers could act as fuses for thesignals, and they can go bad becauseof noise spikes or even strong static.- These chips are inexpensive and readilyavailable. You can order them here:http://www.cnc4pc.com/Store/osc/index.php?cPath=38_43.- Carefully moving chips around andchecking if the problem moves aroundcould be a way of figuring out if this isthe case.- There could be a problem with the - Test this with a different PC or parallelRevision: 9/23/2010 http://cnc4pc.com/TechDocs/C11TR2_1_User_Manual.pdf 21/24