| Electronics > Repair |
| Hantek DSO5102P oscilloscope PSU repair |
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| punkieys17:
The psu has a problem with all the power rails fluctuating, when disconnected from rest of machine. The oscilloscope obviously didn't like the fluctuations so various buttons etc were flashing. A few questions to help me get started please as I am not confident in pwm power supplies. Firstly one of the 3 pin large semis with heat sink is marked NSD618 B2045G - can't find it anywhere. It sits directly after the bridge rectifier and smoothing cap. Thinks it's a high power transistor but can anyone help. As all the power rails were fluctuating I am suspecting that chip. Unfortunately I then managed to incinerate components when my hand slipped. As a result the 3 resistors on the back of the board mounted in parralel are toast. They are marker R2x x3 ( can't read the second digit) and from memory were 1.8 ohms...if anyone can tell me would be grateful. The PSU board is marked for the DSO5000 series. Don't suppose anyone has a schematic.... |
| mushroom:
Google, first answer for hantek dso5000p schematics : https://www.mikrocontroller.net/attachment/175587/Hantek_Tekway_Voltcraft_DSO_hw1007.pdf Could the 5000P share the same PSU ? [EDIT] my 5102P has a different PSU. Yours is v1.1, Mine has no version # ; could be 1.0 ... |
| tunk:
--- Quote from: mushroom on September 15, 2022, 01:27:59 pm ---Could the 5000P share the same PSU ? --- End quote --- Probably not, the components and their numbering are different. Could you post a photo of the back, showing the burned resistors? If it's a marking on an SMD resistor, then R2x could mean that it is a 0.2x ohm resistor. |
| mushroom:
Found this thread, could help a bit (just a bit !) : https://www.eevblog.com/forum/repair/hantek-dso5072p-power-issue/msg3080305/#msg3080305 definitely not my PSU (all THT components), nor the OP's PSU : PCB is labeled 1.0, but there's a high res picture of the copper side : Rnxm means Rn is made of m resistors in series or parallel. |
| snoop33:
They are 153 (15k). Mine is also a "1.0" board, but it has a different bridge diode and I spot an additional transistor N4. I guess a low level PWM is provided to the big transformer by N2 then isolated feedback by N3 and N1 adjusts it. N5 on the rear is a 5V buck. |
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