Dual 30V/5A lab supply MCP M10-DP-305E equivalent - Page 1
Forum section: electronics / repair

author: shakalnokturn
author_rank: Super Contributor
timestamp: February 22, 2020, 01:41:51 pm
content: I have one of these cheap-built but good by today's standards linear lab supplies.One output has no regulation can anyone identify clones-of or similar models that I may be able to find a schematic for?The regulation PCB's are marked "DCPOWRE-1C". (Engineer was dyslexic...)Thanks!

author: Grandchuck
author_rank: Super Contributor
timestamp: February 22, 2020, 03:50:39 pm
content: Maybe this?https://www.google.com/search?q=hy3005f-3+schematic&rlz=1I7RNQN_enUS491&sxsrf=ALeKk02DFIlJmDDzrkyo2ihQpsdaycqiWg:1582386595493&tbm=isch&source=iu&ictx=1&fir=u_zCmtk897hW4M%253A%252CCZztig4In-B0_M%252C_&vet=1&usg=AI4_-kSP9wyi-uwUwoUgktdCU_1uMAEHQQ&sa=X&ved=2ahUKEwiLuq-3weXnAhVEjK0KHUn3CckQ9QEwAHoECAoQBA#imgrc=u_zCmtk897hW4M:

author: shakalnokturn
author_rank: Super Contributor
timestamp: February 22, 2020, 04:34:56 pm
content: Thanks, the HY3005D definitely seems close at a first glance. I'll took into that in more detail later.

author: shakalnokturn
author_rank: Super Contributor
timestamp: February 25, 2020, 10:29:12 am
content: Thanks to Grandchuck for pointing me towards my PS being a not so fantastic Mastech clone.I found a few crusted and rusted relay switching transistors, the current regulation problem was a defective UA741.Moderators: Feel free to move from T.E. to repair if more appropriate.

author: tautech
author_rank: Super Contributor
timestamp: February 25, 2020, 11:14:01 am
content: Quote from: shakalnokturn on February 25, 2020, 10:29:12 amYou can Move Topic yourself.Look bottom left of your page for the link.

author: SkyMaster
author_rank: Frequent Contributor
timestamp: February 26, 2020, 04:38:33 am
content: The MCP M10-DP-305E and Mastech HY3005F-3 were probably heavily "inspired" by theGW Instek GPS-2303.

author: issa
author_rank: Newbie
timestamp: March 15, 2020, 10:53:49 pm
content: Hello there,I am new here so please pardon my mistakes, i have the same exact device , can you lease help me find out the values of a few brunet resistors?either schematics or close ups? please?the resistors are brunet beyond recognition.R1, R2, R3, R5 ,R6, on the front control board named MCP-36AThe large green resistors on the back plate.If there is a schematic i appreciate it.Last, the main power transistors on the back are expensive and hard to find , is there a viable replacement?Thank you all in advance,

author: shakalnokturn
author_rank: Super Contributor
timestamp: March 17, 2020, 08:40:14 am
content: One of the schematics (the one with 3 relays and three TO-3 transistors) for the Mastech models has the right values for the power resistors at the rear.I don't think any of the schematics I saw showed an identical (with optocouplers) control PCB though.I'll see if I can help for those values.

author: shakalnokturn
author_rank: Super Contributor
timestamp: March 17, 2020, 08:39:35 pm
content: Front adjustment PCB:R1: 1kR2: 470RR3: 1kR5: 470RR6: 1kEdit: I won't be trying to help newcomers much longer, I'm under the impression that they mostly loose track of their own requests.

author: cripto25
author_rank: Newbie
timestamp: April 16, 2020, 05:37:33 pm
content: Hi. Although I am new here, I have been browsing this forum for some time and I have always learned something. on this topic I want to make my contribution.I have an MCP M10-TP-305E source that stops working when testing a universal brush motor.I attach photos with the components that I needed to change until I can get it to work again.Thanks to shakalnokturn for the contribution of the value of the resistances since I do not have the scheme.

author: issa
author_rank: Newbie
timestamp: October 30, 2024, 02:43:53 pm
content: Thank you, i know its a late reply. but i never did thank you.so thank you.the right side is not working at all. i cannot figuer out why.i am still lookiong for schematices

author: Harry_22
author_rank: Frequent Contributor
timestamp: October 30, 2024, 03:42:15 pm
content: Hi!What about the right side?Could you picture front panel with measurements like at first post.