Calibration failure EDU09


#21

Here are the IC2 VOLTAGES PIN 1 =4.7V
PIN 2 =-0.12V
PIN 3 =0V,
PIN 4 = -5.2V
PIN 5 = 0V DIRECTLY OPPOSITE 4,
PIN 6 = 4.1V,
PIN 7 =2V,
PIN 8 =5.02V.


#22

ok sorry will re do with program off.


#23

Here are the voltages measured on all IC2 pins:
1: 2.2V
2: 0V
3: 0V
4: -5.2V
5: 0V
6: 0V
7: -2.13V
8: 5.0V

The voltages are measured when the USB cable is connected but the PC software EDU09 is not running.

On IC1 pins the voltages should be:
1: 0V
2: 0V
3: 0V
4: 0V
5: 0V
6: 0V
7: -5.2V
8: 0V
9: 3.3V
10: 0V
11: 0V
12: 0V
13: 0V
14: 0V
15: 0V
16: 5V


#24

Hi Sorry this is taking time but as you can see my results on IC1 are same as you except IC2.


#25

I also noticed that when the sw was running that the relay does work as I can hear it clicking when selecting ac to dc.


#26

Bingo checked the solder joints on IC2 and one was not soldered. Checked with magnifying glass. Thank you very much for your support.


#27

Explains the varied results.


#28

No problem. Glad to be of assistance. Enjoy your EDU09 :slightly_smiling_face: