If the preview and printed workorder displays odd characters instead of a barcode, this indicates the barcode fonts did not install properly.
XP: Control Panel, Fonts, File, Install a New Font, locate the Service Manager programs folder (C:\DRS, DRS Service Manager), Select All, OK, OK, OK, Close.
Windows 7/8/10: Using My Computer (File Explorer) locate the Service Manager program folder (C:\DRS, DRS Service Manager) then right-click on each of the three true type fonts and select Install. Font files are named DBN2xx_.ttf, etc.
IMPORTANT: You must have version 3.x installed. To check your version, see About, About within the application. To install the current release, see this article:
Service Manager - Current Edition and Upgrade - Digital Retail Solutions (kayako.com)