my PSCU200 is no more working. It´s not recognized by the PC.
I compared the PCB with the schematics available for the PSCU1000 and my result is the following:
IC3 (18LF14K50) is no more enabling it´s PIN10 and therefore T6 is not enabled.
That means that all voltage regulators at the bottom of the PCB are not enabled, because PIN4 of IC17,19,20 is not pulled to GND.
Has anybody an idea why PIN10 of IC3 is no more working?
Has IC3 lost it´s software? What are the conditions that IC3 will switch Pin10 to high level and activate T6?
Voltage supply of 3,3V is available on IC3.
Am I right that T6 is an NPN transistor?
it doesn´t seem to be an issue with the driver.
When I connect the device to any other computer which has never seen the PCSU200 before, Windows doesn´t ask for any driver.
I get just the response, that the USB device is not working properly.
I have made a screen shot of USBview - and i think it doesn´t look very well…
Yes indeed I did!
Hardware crosscheck is the first thing I do.
I used several PCs and several USB cable.
But every PC says: Unknown device. Even Linux doesn’t recognize any device.
Can the Microchip device (IC3) lose it’s software or do you have an problem with the flash eeprom emulation inside the chip?
From my point of view it looks like that IC3 has lost it’s NVRAM data and now doesn’t know it’s vendor ID yet.
Vdd and Vusb is stable on the chip. Crystal is o.k. USB-Data +/- is available but it doesn’t start the power supply via T6.
Reprograming of IC3 via J5 could solve the problem…
I used the PCSU200 without any abnormalities and when it got connected the next time it was dead.
It smells like SW issue inside IC3 - sorry for my suspicion but I’m embedded software developer for automotive ECUs
Based on the results of the tests you have carried out, it seems the microcontroller IC3 is defective and doesn’t respond any longer to the requests via the USB bus.
You can return the unit for inspection/exchange to your Velleman distributor or to:
many thanks for the replacement of my defective device.
But I´m still interested on the reslult why my device was broken.
Have you not been able to reanimate I3 by perfoming a reflash?
Do you have any information what has gone wrong with I3?
How must i handle the new device to be sure that this issue doesn´t happen again?
Sorry, for economic reasons the unit has not been repaired but exchanged, so we are unable to inform you about the exact nature of the problem.
Judging by the statistics for this item, the amount of repair is insignificant, so do not worry that it will happen again.
We do recommend to respect the max. input voltage during measuring, as this is the most common source of damage.
