Search found 1221 matches
- Thu Apr 04, 2019 7:53 pm
- Forum: DSO Shell
- Topic: Startup test troubleshooting
- Replies: 6
- Views: 19804
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...
- Thu Apr 04, 2019 1:03 pm
- Forum: DSO138
- Topic: Troubleshooting help needed - voltages wrong
- Replies: 2
- Views: 8239
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.
- Tue Apr 02, 2019 12:43 pm
- Forum: DSO Shell
- Topic: Strange behavior of test signal
- Replies: 6
- Views: 9369
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.
- Mon Apr 01, 2019 11:02 pm
- Forum: DSO Shell
- Topic: Startup test troubleshooting
- Replies: 6
- Views: 19804
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...
- Thu Mar 28, 2019 6:25 am
- Forum: DSO Shell
- Topic: Main board startup test
- Replies: 1
- Views: 3656
Re: Main board startup test
The high rate LED flashing is normal. It indicates trigger activity.
- Tue Mar 26, 2019 8:37 am
- Forum: DSO Shell
- Topic: DSO Shell new schematic
- Replies: 2
- Views: 5487
Re: DSO Shell new schematic
All schematics are available at https://jyetech.com/dso-150-shell/
- Tue Mar 26, 2019 8:35 am
- Forum: DSO138mini
- Topic: Using a Li-po battery?
- Replies: 1
- Views: 12376
Re: Using a Li-po battery?
The 118 (not 117) board can work on Li-po battery no problem.
- Thu Mar 21, 2019 9:24 am
- Forum: DSO138mini
- Topic: Installation instructions for lithium-ion battery
- Replies: 1
- Views: 13224
Re: Installation instructions for lithium-ion battery
Please see attachment.
- Mon Feb 25, 2019 6:42 am
- Forum: DSO 112 & 112A (Coral)
- Topic: Faulty DSO112A?
- Replies: 5
- Views: 18387
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/
- Sat Feb 23, 2019 12:30 pm
- Forum: DSO138mini
- Topic: Have to press & hold [+] and [-] each time after power cycle
- Replies: 8
- Views: 19101
Re: Have to press & hold [+] and [-] each time after power c
Please see it here