Troubleshooting Guide The Troubleshooting Guide for our current production model equipment is now available in Adobe (PDF). If you would like to view the Troubleshooting Guide on the web, and you do not have the Adobe plug-in. Please download the Acrobat plug-in from Adobe. Install the plug-in and click on the Troubleshooting Guide for the products listed below   If you would like to view the Troubleshooting Guide on the web, and you do not have the Adobe plug-in. Please download the Acrobat plug-in from Adobe. Install the plug-in and click on the Troubleshooting Guide for the products listed below. Select a Specific Troubleshooting Guide 400 Hz AC Engine Drive Systems -- Cummins 90 & 120 kVA -- Detroit Diesel 90 - 120 & 140kVA -- Deutz 90 & 120 kVA Option for 400Hz diesel GPU's -- Transformer Rectifier 400Hz AC Frequency Converter Systems -- PoWerMaster SF -- PoWerMaster ADV 28.5 VDC Solid State Systems -- 28.5 VDC-GPU 400 -- 28.5VDC-GPU 600 -- 28.5 VDC-JET-EX 4D   For all your 400 Hz system needs, rely on a name you can trust -- Hobart 1177 Trade Road East, Troy, Ohio 45373 U.S.A Phone: 937-332-5080 / Fax: 937-332-5799 Toll Free: 800-422-7253 Comments or questions: webmaster@itwgsegroup.com