Damaged PCSU1000

Instruments PC Oscilloscopes and Recorders
1

The oscilloscope no longer works or is detected by windows. I believe 240v might have gone into the ground of the scope probe :frowning:. opps!
I have had a look at the board inside and can not see anything damaged. Several of the chips receive 5v but most of the chips including the xilinx receive no power at all. Is this fixable? I have very little money to fix it as I am a student, so need to fix it my self. Can you offer any advice? Are the schematics available anywhere?

Thanks

2

[quote]Several of the chips receive 5v but most of the chips including the xilinx receive no power at all.[/quote]This is normal. The XILINX chip is powered only after the USB connection is activated. The PWR line (pin 10 of IC25) goes down.
Maybe the USB chip IC25 is damaged.

The documents are on the installation CD in the folder: D:\Technical info\PCSU1000 USB PC scope\Diagrams
You can also use this link to download the documents: box.net/shared/izxs8jm8rt

3

Thanks, that should help a lot. Looks like all the voltage regulators have the correct voltage on all input pins but are not outputting any voltage so I suspect it could be them.

Thanks

4

The regulators are controlled on/off by the EN pin number 4.
If this pin is held high by the IC25, then there is no output voltage from the regulator.
Most probably IC25 is defective.

You can first check if there is any “life” in the IC25.
Measure the voltage over C87 and over C88.
Voltage over C87 should be about 2V and over C88 about 2.5V.

5

You may download the usbview.exe and check if you find anything if you connect the PCSU1000.
Here is a link to download the USB View program: box.net/shared/mc3pt7bt1n

USBView is a free utility from Microsoft that displays the USB connection tree and shows the USB devices that are connected to it together with their configuration data. This is very useful for debugging USB enumeration errors.

6

was problem with pcsu 1000 , the oscilloscope no longer works or is detected by windows. I believe 240v might have gone into the ground of the scope probe .
so after I was changed ft245bl chip , no results :frowning:
changed C76 C126-128 4 capacitors to same 470mfr 16v and it is working now perfect

7

[quote]changed C76 C126-128 4 capacitors to same 470mfr 16v and it is working now perfect [/quote]It is strange why the electrolytic capacitors have damaged.
It is good to see that you got your PCSU1000 working again!

8

There is nothing strange. I’ve deal with such cases. The “electrolytes” can be easily damaged by sharp avalanche currents through the PCB. It depends mostly on PCB topology and on the points between the current applies.

9

Hello
I damaged my PCSU1000 oscilloscope in the similar way. I replaced FT245BM IC. After that i have connected oscilloscope back to PC. It asked me for a driver. I have let the windows to chose appropriate driver it self and it has chosen a serial port driver. After that i have tried to start PC_Lab2000se application but when i chose PCSU1000 i get error message "Open_USB_Device_By_Serial_Number - Device Not Found.
Is there anything else i can do to try to save my oscilloscope?

10

First you have to check that the EEPROM attached to the FT245BM contains proper data.
You can use the MProg program to check the EEPROM.
Here is the link to download the program:
box.com/s/jk6otg029kcq1iodl2h6
Just extract the files and run MProg.exe.
Select Tools -> Read and Parse
The screen displayed should look like this one:

666×617

If not, then you have to reprogram the EEPROM.
Select File -> Open
Open the file PCSU1000.ept in the Templates folder.
Select: Device -> Program.
When done you have to install the PCSU1000 driver.
You can download it from this page: velleman.eu/support/download … 1000&type=

Please see also these threads:
viewtopic.php?f=10&t=2202&start=15
viewtopic.php?f=10&t=1208&view=previous
viewtopic.php?f=10&t=1879&view=previous

11

I have a similar case. I checked PIC16F630. It is faulty. You can fix this?

12

I’m just curious to know what are the symptoms of the problem?

[quote]I checked PIC16F630. It is faulty. You can fix this?[/quote]You can return the defective IC for inspection/exchange to:

Velleman Projects Tech. Dept.
Legen Heirweg 33
9890 Gavere
Belgium

13

I apologize for the bad English. After a failed connection was current through the housing. Withdrew PIC16F630. The board 3.3V and 2.5V = 0. In these circuits short circuit. I unsolder chip FPGA XC3S50. Short circuit disappeared. PIC16F630 checked in the programmer. Programmer an error over current. I think PIC16F630 is defective. I can buy XC3S50. How to check the PIC16F630?

14

[quote]PIC16F630 checked in the programmer. Programmer an error over current.[/quote]It seems the PIC16F630 is damaged.
You can return the damaged PIC16F630 for replace.

There may be also other damaged circuits on the board.
You can test all the oscilloscope operation also without the PIC16F630.
Replace the XC3S50 with new one and run the PCSU1000 program normally.
You should see “Loading please wait…”.
You can run and test all oscilloscope functions.
When the PIC16F630 is removed, you’ll see all waveforms on the screen periodically “broken”.
Here an example how 1kHz sine wave is displayed in this case:

15

Thank you. I will restore the damage.

16

Hello. Help is needed. After the oscilloscope chassis will likely went high potential. He then stopped determined laptop. Replaced chip FT245BM then oscilloscope started. But it works like a strange way. the signal line is at the bottom of the screen when you change the height of the bottom edge to the beginning of the second line (in each half of the four-line screen) signal line rises but decreases the amplitude of the signal when to raise even higher the signal line is stopped at the boundary of the second row and remains unchanged, although the position slider moves. signal measurement stops and looks on the screen as a static line. If the height of the lower back the signal become dynamic again. A similar situation is observed on the second channel. Frequency is measured correctly. The trigger does not work properly if it is on the measurements are not performed as expected his trip. Trigger level adjustment does not change anything. Replacing and reprogramming the chip 93LS46V no avail. Oscilloscope calibration fails. I can send log files.

17

You can return the PCSU1000 for inspection/repair to your local Velleman dealer or direct to:

Velleman Projects Tech. Dept.
Legen Heirweg 33
9890 Gavere
Belgium

Please include a detailed fault description.

18

I would gladly have sent it to you, but I’m in Russia, Omsk and sending the oscilloscope will cause great difficulties, so let’s try to solve the problem remotely. Thank you.

19

You may try to check the operation of the input amplifier section.
Check that the output pin 7 of IC12 goes to about 0V when you put +4V DC to CH1 channel input at 1V/div range.
Then put -4V DC to CH1 input.
Now the output pin 7 of IC12 should be at +1.3V.

Alternative test:
Adjust y-position slider of CH1 to max position.
Now there should be about -0.4V at pin 7 of IC12.
Adjust y-position slider of CH1 to min position.
Now there should be about +1.7V at pin 7 of IC12.

20

Thank you for helping. I made a test as you described. I will bring them in table format:
pin 7 of IC12
1V/DIV 0V DC to CH1 +4V DC to CH1 -4V DC to CH1
CH1max -0,388V -0,986V 0,246V
CH1min 0,926V 0,292V 1,571V
CH1center -0,345V -0,918V 0,357V

What has been noted that on pin 7 positive potential measurements are made (dynamic signal line) when it is not held on the pin 7 negative potential measurement (signal line static)

Do you have e-mail, I would have sent you a full table of measurements carried out by me on this site unfortunately I can not post attachments