WTD: Service Manual Kenwood PSR20-18M

[PM3295]

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.

[norkimo]

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.

[PM3295]

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.