Search found 1221 matches

by jye1
Thu Apr 04, 2019 7:53 pm
Forum: DSO Shell
Topic: Startup test troubleshooting
Replies: 6
Views: 18754

Re: Startup test troubleshooting

What you said is likely the case. If the regulator failed the unregulated voltage will kill the chip for sure. For new design the power supply will use 5V with USB style connector. This will significantly reduce the risk put by uncertainty of power sources. We are happy to send you another replaceme...
by jye1
Thu Apr 04, 2019 1:03 pm
Forum: DSO138
Topic: Troubleshooting help needed - voltages wrong
Replies: 2
Views: 8214

Re: Troubleshooting help needed - voltages wrong

Was U5 hot when L3 was connected? If yes that means AV+ branch drawn too much current. Please check if U2 was installed correct. If it is reversed AV+ may not appear short when checked by ohm-meter.
by jye1
Tue Apr 02, 2019 12:43 pm
Forum: DSO Shell
Topic: Strange behavior of test signal
Replies: 6
Views: 9299

Re: Strange behavior of test signal

The test signal is always present regardless the amplitude display. ADJ holding just turns on/off the display, not the signal.
by jye1
Mon Apr 01, 2019 11:02 pm
Forum: DSO Shell
Topic: Startup test troubleshooting
Replies: 6
Views: 18754

Re: Startup test troubleshooting

Sorry to know you found three units not working. For unit 1 it was pretty obvious that the main chip (the MCU) was burnt. When in production each board was put on a special testing fixture for shorts/opens checking to ensure soldering was done properly. After that each board was applied 9V power aga...
by jye1
Thu Mar 28, 2019 6:25 am
Forum: DSO Shell
Topic: Main board startup test
Replies: 1
Views: 3638

Re: Main board startup test

The high rate LED flashing is normal. It indicates trigger activity.
by jye1
Tue Mar 26, 2019 8:37 am
Forum: DSO Shell
Topic: DSO Shell new schematic
Replies: 2
Views: 5463

Re: DSO Shell new schematic

All schematics are available at https://jyetech.com/dso-150-shell/
by jye1
Tue Mar 26, 2019 8:35 am
Forum: DSO138mini
Topic: Using a Li-po battery?
Replies: 1
Views: 11615

Re: Using a Li-po battery?

The 118 (not 117) board can work on Li-po battery no problem.
by jye1
Thu Mar 21, 2019 9:24 am
Forum: DSO138mini
Topic: Installation instructions for lithium-ion battery
Replies: 1
Views: 12465

Re: Installation instructions for lithium-ion battery

Please see attachment.

DN138-22v01_DSO138mini_PowerSupplyOptions_wm.pdf
(1.51 MiB) Downloaded 2134 times
by jye1
Mon Feb 25, 2019 6:42 am
Forum: DSO 112 & 112A (Coral)
Topic: Faulty DSO112A?
Replies: 5
Views: 17544

Re: Faulty DSO112A?

Thank you for sending the photos. The DSO112A you purchased was a counterfeit. All our DSO112A are white and with a JYETech logo on front face. We don't have black enclosure. Please see https://jyetech.com/dso-coral-112a-oscilloscope/
by jye1
Sat Feb 23, 2019 12:30 pm
Forum: DSO138mini
Topic: Have to press & hold [+] and [-] each time after power cycle
Replies: 8
Views: 18257

Re: Have to press & hold [+] and [-] each time after power c

Please see it here
113-13810-100.zip
(44.79 KiB) Downloaded 1221 times