My ebay's KIKUSUI PMC350-0.2A unit arrived today but didn't work. Any idea? - Page 1
Forum section: electronics / general

author: MrPlacid
author_rank: Frequent Contributor
timestamp: December 07, 2010, 07:23:19 am
content: I saw this power supply on ebay and won the bid last week (very cheap). It came but it seemed like it's not working. I made a video slide show of it on youtube. It's probably a good instructional video on how to use the device. (Probably need to make one for your basic power supply for the newbies in here.) Anyway, any idea on what is wrong with this thing? If I made a mistake during my check, let me know. And if there is a quick fix, I rather do that than return it to the seller. It looks so nice, It would be so nice on my work bench. Too badI love those big transform power supply enclosed in a metal casing.PS: You can see Dave's influence in the video, see the Fluke 87V laying down? Also, from reading the forum messages, I got to know the Lindstrom cutter, the yellow cutter on the right. Oh, that cutter is so good. Dave can probably sell me anything

author: tyblu
author_rank: Frequent Contributor
timestamp: December 07, 2010, 08:47:04 am
content: The unit went into over-current protection when you activated the outputs? This implies a short.

author: MrPlacid
author_rank: Frequent Contributor
timestamp: December 07, 2010, 09:15:15 am
content: Oh, heck. Might as well do it while the camera is still hot. Here is to all the newbies. (and I am one of them)Quote from: tyblu on December 07, 2010, 08:47:04 amIt was the CC light that lit up. Sorry, the image wasn't clear. But you have a point though, in my second video. (Just made it while, waiting around the forum.) When I touch my two probes together which basically create a short circuit, my other power supply enter CC mode and the voltage drops to zero. It's similar to what happen to the Kikusui unit when output is activated.I am gonna try and contact the seller, he did say the unit was "THIS IS A CLEAN WORKING UNIT". If so he might know something about the unit that could help. I hope he does, but seeing the ebay image compare to the youtube video front image, I am doubting him big time.

author: FreeThinker
author_rank: Frequent Contributor
timestamp: December 07, 2010, 01:55:18 pm
content: It's quite common for there to be some filtering/protection on the output.Look on the rear of the output jacks or around the connections to the jacks on the main pcb for blown diodes or caps.I've known protection diode fail and short out causing this problem.Google for a schematic.

author: slburris
author_rank: Frequent Contributor
timestamp: December 07, 2010, 04:07:39 pm
content: Can you open the power supply up and take some photos of the insides?Could this be a relabeled Mastech design? There are some schematics oftheir units available.Scott

author: MrPlacid
author_rank: Frequent Contributor
timestamp: December 07, 2010, 04:54:01 pm
content: Here you go Slburris,

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: December 07, 2010, 11:40:07 pm
content: Quote from: slburris on December 07, 2010, 04:07:39 pmBasically this brand it should be an ( Made in Japan ) one.If not .... then you have run out, of luck. ( about support & information ).

author: slburris
author_rank: Frequent Contributor
timestamp: December 08, 2010, 02:49:06 am
content: Hmm, it doesn't look anything like either the Mastech or Atten designs I'veseen.Have you measured the output with the 87V to insure that this isn't some sortof funny display problem, yet the supply is producing output? Unlikely, butit would be a quick test.Or, with the unit unplugged, you could use the 87V in resistance mode andsee if the output appears shorted.Any bulging capacitors that you can see? Especially near the output jacks?Scott

author: MrPlacid
author_rank: Frequent Contributor
timestamp: December 08, 2010, 04:00:29 am
content: Sorry, the forum had trouble this morning and only 1 pic was upload. Here they are again.Quote from: Kiriakos-GR on December 07, 2010, 11:40:07 pmYes, it is from japan. The manual said to contact a KIKUSUI repair center which I am not gonna do. The inside is so beautiful and echo quality. I just like how they sectioned each part on the unit so cleanly. I am drooling just thinking about it.Quote from: slburris on December 08, 2010, 02:49:06 amScott, hehehe... I took the unit apart many times already. It's my bad habit and check visually for any bulging caps and any burnt spots. Only one I could find appear to look like a resistor-like inductor, but the image on the circuit board said it's a diode. On the far right are two unplugged wires. It seemed they are for foreign voltages, and should be left alone.Yes, I checked the output on the fluke. No, voltage appeared. Didn't do the resistance test, and I'll keep that in mind next time when doing a check. Gonna return the unit, I think if I keep it any longer, I'll probably open it up too much and break something rendering it unreturnable.Thanks for the help all.

author: Kiriakos-GR
author_rank: Super Contributor
timestamp: December 08, 2010, 06:45:36 pm
content: Technically this device is an fantastic sample of manufacturing quality ..I bet that by removing the PCB of the front panel, you will get an better picture of the damage.Usually those PSU they use small relays , that could possibly fail. ( natural aging = burned inner contacts ) usually made by Omron ..