[SOLD] FS (EU) Kenwood PD18-20AD PSU, 0-18V /20A, Digital, (needs repair) - Page 1
Forum section: electronics / general

author: HighVoltage
author_rank: Super Contributor
timestamp: July 05, 2014, 11:08:01 am
content: FS (EU) Kenwood PD18-20AD PSU, 0-18V /20A, Digital, (needs repair)I bought this Kenwood PSU new in 2001 in the USA.It worked perfectly until a few weeks ago.Suddenly the voltage could not be regulated anymore.Once in a while, when I turned it on, it was working again correctly, but not anymore.Symptoms:The voltage level can be set correctly, but when the output is turned ON, the display shows a totally different valueThe Current level can be set correctly but co current comes out when the output gets turned ONRepair attemptI do not have a schematics or service manualSo, I poked around with a scope and multimeter but I could not find anything wrong.Input VoltageThe PSU was set to 120 Volts AC when I bought and I did not bother changing it, since I have 120V in my lab as well.The input can be changed at the Transformer to 230 / 240 Volts (See pictures)Highlights- High stability, large capacity, low ripple, low noise & remote sensing- Permits both constant voltage and constant current operation- Dual digital displays- High accuracy voltage adjustment and current settings- Phase-control preregulator ensures fast response and stability of high currents- Over voltage, over heat and over current protection- Remote control of output voltage and current via external DC voltage or resistance- Parallel operation will increase output current- GPIB system compatibility- Voltage regulated- Operation input regulation 0.005% +1mV- Power supply: AC 100V; 120V; 200V; 240V, 50/60 Hz, Switchablehttp://www.davis.com/Product/PD18_20AD_DC_Power_Supply_Regulated_0_18V_20A_With_Digital_Display/DO-20017-76Outside and Inside conditionLike newOriginal PriceI think I paid something close to US$ 3000 for this PSU in 2001LocationThe PSU is located in GermanyShippingI will ship anywhere in the world .... but .... the unit is very heavy and it only makes sense to ship in the EU.In Germany we have a shipping service called HERMES.They only go by the size of the box and not by weight.They also ship all over the EUShipping cost will be around Euro 20Asking priceMake me a serious offer.The one that makes me the best offer, will win the bid.RequestIf you get this PSU and repair it, I would ask you to post here on eevblog, how you solved the problem.

author: HighVoltage
author_rank: Super Contributor
timestamp: July 05, 2014, 11:10:15 am
content: More picture attachments

author: HighVoltage
author_rank: Super Contributor
timestamp: July 05, 2014, 11:10:55 am
content: Even more picture attachments

author: con-f-use
author_rank: Unknown
timestamp: July 05, 2014, 01:45:24 pm
content: Quote from: HighVoltage on July 05, 2014, 11:08:01 amYou mean $300 right? You should make a price suggestion none the less for your faulty PSU.

author: HighVoltage
author_rank: Super Contributor
timestamp: July 05, 2014, 02:41:04 pm
content: Quote from: con-f-use on July 05, 2014, 01:45:24 pmActually, I think the list price was around $ 2500 and then I got a few options and a discount from the distributor.But then, I am not sure anymore of how much I paid exactly.This is not your usual $ 300 PSUI really do not want to make a big profit on this one.It is more important to me, that someone who wants this one can get it for a very good deal.If someone is offering me 100 Euro Plus shipping, I will take it.And if nobody is willing to pay that much, then I will gladly send it to anyone for shipping cost.Just make an offer.

author: PA0PBZ
author_rank: Super Contributor
timestamp: July 05, 2014, 02:49:11 pm
content: Original price confirmed:http://www.tequipment.net/KenwoodPD18-20AD.html

author: Flump
author_rank: Frequent Contributor
timestamp: July 05, 2014, 06:05:52 pm
content: this was a very expensive psuhttp://www.tequipment.net/KenwoodPD18-20AD.htmlI would love it but have no idea how to fix itand shipping would be expensive becauseof that lovely transformer.I think it would be a good idea to put this in the repair sectionas there are lots of people here that can help you fix itedit:sorry PAOPBZ i didn't scroll down far enoughto see your post before googling the price

author: Flump
author_rank: Frequent Contributor
timestamp: July 05, 2014, 06:16:07 pm
content: look here there is a floating plugis it meant to be plugged in ??

author: HighVoltage
author_rank: Super Contributor
timestamp: July 05, 2014, 06:32:15 pm
content: Quote from: Flump on July 05, 2014, 06:16:07 pmThat was me, unplugging and testing all connections.I think shipping will be reasonable for about 20 Euro within Europe.

author: Flump
author_rank: Frequent Contributor
timestamp: July 05, 2014, 06:52:57 pm
content: aww thats a shame| repaired a friends psu today, it would blow the mainsfuse each time you switched it on, it was the rectifier,I bet yours is a simple fix but its finding the problem.I tried searching service manuals and schematics for your supplybut nothing on the web for it, i wonder if kenwood has anyinfo like that for it ? , got to be worth sending their tech supportand email£20 for shipping is pretty good when you consider the weight of it.

author: TheBorg
author_rank: Frequent Contributor
timestamp: July 05, 2014, 06:54:31 pm
content: Quote from: Flump on July 05, 2014, 06:52:57 pm19 Kilos + box weight

author: Flump
author_rank: Frequent Contributor
timestamp: July 05, 2014, 06:58:39 pm
content: trouble shooting section at the bottom of this user manualhttp://www.tequipment.net/assets/1/26/Documents/PD-A_manual.pdf

author: HighVoltage
author_rank: Super Contributor
timestamp: July 06, 2014, 08:57:15 am
content: Quote from: Flump on July 05, 2014, 06:58:39 pmThank you FlumpThis trouble shooting section is rather limited.I went trough it already a few weeks ago.The problem is likely something simple in the feedback regulation circuit.And if someone has the time, it should not be too hard to find and fix the fault.I have too many projects going on already.Also, I got another powerful PSU from Agilent, so no need for me to keep this one.Really no offers at all?

author: SeanB
author_rank: Super Contributor
timestamp: July 06, 2014, 09:23:51 am
content: Just the shipping alone puts it out of my budget at the moment.

author: London Lad
author_rank: Regular Contributor
timestamp: July 06, 2014, 09:26:50 am
content: I have sent an offer :-)

author: HighVoltage
author_rank: Super Contributor
timestamp: July 06, 2014, 09:36:11 am
content: Sold to London LadThank you all for your feedback.