Display Runs - that's all


#1

Hello Velleman Team,

today i have build your Oszilloskop EDU 08 and now i need some help.
I send you an Picture, the Display lights up so it works but there is no signal or anything else.
I hope you have some ideas for me.

Kind Regards

Khargaraa


#2

As a first test you may check the voltages on SK1 connector on the top board.
Please see this thread for more info:
viewtopic.php?f=69&t=18057


#3

Done!

Top row from left to right 3.33, 0, 0, 0, 0, 0, 3.32, 0, 0.55
Bottom row 0, 3.33, 0, 0, 0, 0, 0, 3.32, 0

These are my results.


#4

The voltages seem to be OK.
The problem may be on the display board.
Please check all the display soldering joints for possible short or open.

You can also check the voltages on the points marked A-M in this picture:

The voltages should be about:
A=9.2V
B=8.2V
C=7.2V
D=2.0V
E=1.0V
F=1.6V
G=7.2V
H=1.6V
I=4.6V
J=9.8V
K=1.6V
L=3.3V
M=11.2V


#5

It Runs! :smiley:
Thank you for the hint!


#6

I’m glad to see you got it sorted out!