HP d640 HP D640 High-Volume Printer - User Manual (Printer and Accessories), C - Page 256

Troubleshooting Troubleshooting Paper problems are somewhat difficult to detect. A series of steps will help isolate paperinduced problems. The steps to follow are: • Is it a paper or a printer problem? • Isolate a paper path • Isolate a paper brand • Isolate a paper type • Evaluate user's paper practices • Evaluate environmental conditions Is it a Paper or Printer Problem? When determining a printer failure, a distinction must be made between problems relating to the printer itself and those involving paper. Often a problem which first appears to be related to the printer is actually a matter of poor paper selection or handling. To determine is a problem is printer or paper-induced a few simple steps can be helpful: • Turn paper over in the tray to print on the reverse side. • Rotate sheets 180° (end to end) to feed with a different leading edge. If the symptoms cease, or change in some way, it can be assumed that the problems are paper induced. Isolate a Paper Path The physical properties and composition of a particular paper influence its motion along a printer's main paper path. As a general rule, the straighter a paper path, the more forgiving it is of the paper's physical characteristics. Try Using the Straightest Paper Path Some problems can be avoided by using the straightest paper path. Feed paper from tray1. This path is recommended for transparencies and heavy basis weight media. Ltr Ltr Ltr Figure D-5 D640 paper paths D-20 Using Paper