Hello all.
I need some help with power supply for HP DesignJet 500 plotter.
There are few blown components in it.
Board marks are VDR2, VDR3. Both components are blown and there is no
chance to read parameters.
Power supply is made by Astec /there is no model number on the board/
Picture in attached file. Thanks.

https://www.digikey.com/product-detail/ ... -ND/593818

Varistors are only side-effect of initial problem.

Thank you, I will continue with inspection.