Search found 1221 matches

by jye1
Wed Aug 07, 2019 2:41 pm
Forum: FG085
Topic: Firmware revisisions
Replies: 3
Views: 24235

Re: Firmware revisisions

The version -135 is for PCB 109-08500-00P which contains change in the clock circuit to make the oscillator more reliable. It is identical to version -132 in performance. But version -135 can not run on the old board (109-08500-00G).
by jye1
Sun Jul 28, 2019 12:36 pm
Forum: DSO138mini
Topic: DSO 138mini no trace
Replies: 3
Views: 14293

Re: DSO 138mini no trace

The voltages were good and the trace was actually on the screen. So it looks the scope was working mostly. The issue could be connection problem with the probe or the input terminal. Please see related documents here https://jyetech.com/dso138mini-oscilloscope-diy-kit/ . The firmware was the most up...
by jye1
Fri Jun 28, 2019 3:02 pm
Forum: DSO Shell
Topic: Screen doesn't show anything, probably faulty product
Replies: 5
Views: 16046

Re: Screen doesn't show anything, probably faulty product

Did the LCD light up? When power was applied did you see the LED on PCB blinked? Please also check the voltages at the points marked V+ and +3.3V.
by jye1
Sun Jun 23, 2019 12:59 pm
Forum: Wave2
Topic: Only 1 channel working
Replies: 6
Views: 15922

Re: Only 1 channel working

It's the problem was found. For not fully assembled boards solder joints like this that are easy to access are not included in the production tests. They relies on DIYers to fix if problem arises.
by jye1
Sun Jun 23, 2019 3:11 am
Forum: DSO 068
Topic: Latest version of DSO 068
Replies: 2
Views: 14339

Re: Latest version of DSO 068

Please see attachment. The major changes were:

1 ) Use U5 for crystal oscillator instead of U4. U4 clock is driven by U5 pin 12. This makes the clock more reliable.
2 ) Deleted buzzer circuit which is not related to oscilloscope operation.
105-06800-00I.pdf
(121.95 KiB) Downloaded 1164 times
by jye1
Sat Jun 22, 2019 1:54 am
Forum: Wave2
Topic: Only 1 channel working
Replies: 6
Views: 15922

Re: Only 1 channel working

Thank you for the details. It looks the connection from Ch1 analog channel output to the ADC input on the main board was open somewhere. The screen displayed CH1 waveform as if no analog board connected. It is suggested to check the connection from the point V14 at analog board to U1 pin10 on the ma...
by jye1
Tue Jun 18, 2019 10:14 pm
Forum: Wave2
Topic: Only 1 channel working
Replies: 6
Views: 15922

Re: Only 1 channel working

Can you post more details? Did you check with or without probe? Try touching the center conductor of the BNC connector with a screw driver and check if you can see any activity on screen. Also make sure the voltages at analog board check points are correct.
by jye1
Sat Jun 15, 2019 1:37 pm
Forum: Wave2
Topic: splash screen info vs info page
Replies: 1
Views: 10773

Re: splash screen info vs info page

This shouldn't be the case. There is only one copy for the firmware version. Can you double check and confirm? Thanks.
by jye1
Sun Jun 09, 2019 3:13 pm
Forum: DSO Shell
Topic: Sin cambio en la forma de onda de 1.V a 2.V
Replies: 3
Views: 7385

Re: Sin cambio en la forma de onda de 1.V a 2.V

It looks the problem was SENSEL0 which was stuck at 0V. This explains the measurement results.
by jye1
Mon Apr 08, 2019 6:21 pm
Forum: DSO Shell
Topic: Strange behavior of test signal
Replies: 6
Views: 9300

Re: Strange behavior of test signal

When the amplitude display is on pressing ADJ should toggle signal level as well as the display. When the amplitude display is off pressing ADJ won't affect the signal level. It will turn on or off fast adjustment mode. The signal level will keep the last setting before the amplitude display was tur...