Gabotronics XScopes, User Manual

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XScopes
User’s Manual
DS-XScopes-3.5
– December, 2014
Page | 41
10) The source code says "evaluation version", can I get the full version?
The full source code can be found on GitHub: https://github.com/ganzziani/XScopes-Firmware
11) I tried updating the firmware using the USB bootloader. It didn’t work and now the device does not start.
The bootloader should still be functional. Try resetting the computer and try the procedure again, step by step.
12) How does the XScope compare to other digital oscilloscopes?
You can check this comparison table: http://www.gabotronics.com/resources/hobbyists-oscilloscopes.htm
11. Troubleshooting
1) The unit does not power up!
If using the USB connector to power, try applying 5V directly instead with another power supply.
2) Something went wrong during the USB updating, now my portable device doesn’t even get recognized by the PC.
The device might be running invalid code. Open the case and short pins 5 and 6 of the PDI port to reset the device.
3) The unit powers up but the MSO is not working.
Try restoring the default settings: Press K4 during power up, then select "Restore"
4) The screen turns off after a certain amount of time.
This is the screen saver in action. The screen saver time can be changed in factory options (See Section 1.6).
5) I built my own Xprotolab, a particular button doesn't work.
There might be shorted pins on the microcontroller. Check for debris or solder bridges. Using a solder wick on the pins will
help.
6) When powering up, the splash screen stays for a very long time (more than 4 seconds).
The crystal is defective or the traces on the crystal are shorted.
7) It still isn't working!
If you have a multimeter and want to try to fix yourself, check the following voltages. If any of the voltages are wrong,
there might be a defective part.

Voltage at +5V should be b4.75 and +5.25V

Voltage at -5V should be between -4.75 and -5.25V

Voltage at +3.3V should be b3.2 and +3.4V

Voltage at pin 8 of U3 should be b2.00 and +2.09V
If all fails and if the device is under warranty, you can send it back for repairs.
If the unit is powered with
more than 5.5V, the negative
voltage generator would be the
first component to get damaged.
If the screen is blank, some signs that the microcontroller is working are:
- Activity on the green LED.
- When connecting to a PC, you can hear the “Device connected” sound on Windows.