Service manual

218 Troubleshooting ENWW
Determine where media jams occur
Check where media stops when a jam occurs. Types of jams include:
● input paper jams
● internal paper-path jams
● paper access plate
● output-bin jams
Determine whether the printer is experiencing misfeeds or multifeed jams
The following are some possible causes of misfeeds or multifeed jams:
● The media might be too stiff. Check basis weight and measure caliper. (See pages 44
through 48 for information about testing media.)
● The paper might be too smooth. Check the finish.
● The paper might be too heavy or too light. Check basis weight. (See pages 44 through 48 for
information about testing media.)
● The customer might be attempting to print embossed paper, pre printed forms, or perforated
paper that does not meet HP specifications. See “Isolate a media brand” on page 218 below
or details about issues involved in printing on embossed paper.
● The paper might be loaded incorrectly. Turn over the sheets in the paper tray to determine if
in-ream curl is causing misfeeds.
● The customer might be fanning media before loading it into the tray.
● The customer might be adding media in small amounts. Do not add small amounts of media
or mix types of media in the tray.
● The printer or media storage environment might be too humid or too dry. (As a result, media
might be too moist or too dry.) Determine if this is the case and advise the customer.
Isolate a media brand
If the printer jams with only one brand of media:
● Try switching media brands.
● If the paper ream in use appears to be old, open a fresh ream of the same paper and load it
correctly into the printer. If the problem disappears, investigate storage and handling
conditions.