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Author Topic: WTD: Service Manual Kenwood PSR20-18M  (Read 568 times)
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PM3295
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« on: April 06, 2015, 04:45:41 16:45 »

Hi,

I am looking for a service manual for this remote programmable PSU.
http://www.ebay.com/itm/NEW-Kenwood-Texio-PSR20-18MY3-DC-Regulated-Power-Supply-20-VDC-18-A-/131394111385

So far, I was unable to find a copy free or for sale of the manual anywhere.
The problem with my unit is that you can set up the desired voltage and current from the programming unit PSR-600, and that will display on the PSR20.
When you press to enter or output on, the unit goes into "CC" constant current mode with, I and V showing zero. I suspect a problem with the power supply rather than the controller.
Unfortunately, I don't have a spare of either to verify.

The output of the PSR20 is not shorted as to cause this condition.

Any help appreciated.

Thanks.

« Last Edit: April 06, 2015, 04:49:01 16:49 by PM3295 » Logged
norkimo
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« Reply #1 on: April 06, 2015, 10:45:54 22:45 »

The output may not be shorted, but have you taken a peek inside the supply yet?  Sometimes failed components are more obvious than you might think and could point to where you should start looking.

Also, and I realize this may sound like a silly or "obvious" answer, have you tried contacting Texio Support yet? http://www.texio.co.jp/en/06cont_00.html

Even though it sometimes feels counter-intuitive, I've had great luck contacting the OEM for service manuals when it comes to power supplies.
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PM3295
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« Reply #2 on: April 07, 2015, 02:29:52 02:29 »

I had the unit open previously and could not see any blown components. Furthermore, spot checks with a meter did not show any shorted components. It is a very compact unit with the microprocessor and power pcb's stacked on each other. It does not look that service friendly at first glance. I will try to contact the service support and see if I can get any service information.
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