After assembling the K8062 kit. When connecting with the PC a get a code 10 in the device manager. What means the device could not ben started. The power led is working and also when connecting the device the DMX led flashes a few times.
When using the test mode with a 9V battery I get an even stranger behavior. Accidently I connected a used battery that has not the full power and the when pressing the button the power led lights up, but when releasing the button the led turns off. When using a new battery there happens nothing.
I also bought a K8039. That is working properly in test mode and does not react on the K8062. I don’t know this device works fine, because I have no other DMX devices. This are the first one’s.
I also readed other post about the K8062 (one and two). I have done the tests of the second post and that looks good when connected with the PC. In test mode there is nothing on pin 20 and on pin 14.
Further there is something strange with the enclosure. On the top part is something missing for the screw that is closing the enclosure. So you can only use one screw. The second screw is useless.
It seems that there is something wrong in the USB section of the unit. Please check the values of the C7 (220nF) and R9 (1k5). Also check the USB connector soldering. If possible use ohmmeter to check all the connections.
In the test mode when the button SW1 is pressed the PIC micro gets about 4.5V to its input pin 2 (RA0). Then the PIC outputs 5V from pin 27 (RB6) to the base of the transistor T2 to keep it and also transistor T1 leading and keeping the power on. A long press of the button turns the power off.
If possible measure all those voltages when shortly pressing the button and after releasing the button. If not OK then check all the components and connections.
It seems that you need a new upper part of the housing. Please contact Velleman support.
[quote]Also check the USB connector soldering. If possible use ohmmeter to check all the connections.[/quote]Looks good and tested with ohmmeter and everything was ok.
[quote]In the test mode when the button SW1 is pressed the PIC micro gets about 4.5V to its input pin 2 (RA0).[/quote] Only get 0.03V there when the button is pressed.
If there is no input voltage I would think the problem is in the battery supply. I tested visual all the connections. The resistors and a few connections I checked with a multimeter, but there ends my knowledge. My multimeter isn’t also capable of checking the capacitors…
[quote]It seems that you need a new upper part of the housing. Please contact Velleman support.[/quote] I will do that as soon the kit is working.
No need to measure the capacitors. Just check that C7 is marked 224.
Very strange that you do not get any voltage to the point RA0. If there is voltage in your battery there should be more than 0.03V. Have you checked the battery voltage when it is connected to the battery connector?
Based on your results it seems that transistor T1 is faulty or not correctly assembled or mixed with transistor T2 or VR1.
Please check that the following parts are in right places and in right positions:
T1 = BC327
T2 = BC337
VR1 = UA78L05
[quote=“VEL255”]No need to measure the capacitors. Just check that C7 is marked 224.[/quote] That is.
[quote]Very strange that you do not get any voltage to the point RA0. If there is voltage in your battery there should be more than 0.03V. Have you checked the battery voltage when it is connected to the battery connector?
Based on your results it seems that transistor T1 is faulty or not correctly assembled or mixed with transistor T2 or VR1.
Please check that the following parts are in right places and in right positions:
T1 = BC327
T2 = BC337
VR1 = UA78L05[/quote]I checked that twice allready yesterday and now again.
There seem to be two problems: The USB communication is not working and the power switch and regulator for demo mode is not working. Maybe there is common reason for both failures.
Sorry that I can’t guess what might be the reason to these problems.
I think that if you can’t get the kit working you have to return it for repair. See how to proceed from: velleman.be/be/en/support/warranty/