HP Designjet T120 ePrinter - Manual (Page 115)

General printing advice
When you have any print-quality problem:
● To achieve the best performance from your printer, use only genuine manufacturer's supplies and
accessories, whose reliability and performance have been thoroughly tested to give trouble-free
performance and best-quality prints. For details of recommended papers, see Order paper
on page 91 .
● Make sure that the paper type selected in the front panel is the same as the paper type loaded
into the printer (see View information about the paper on page 39 ). Also make sure that the paper
type selected in your software is the same as the paper type loaded into the printer.
CAUTION: If you have the wrong paper type selected, you could experience poor print quality
and incorrect colors, and perhaps even damage to the printhead.
● Check that you are using the most appropriate print-quality settings for your purposes (see Printing
on page 42 ). You are likely to see lower print quality if you have moved the print-quality slider to
the 'Speed' end of the scale, or set the custom quality level to Fast.
● Check that your environmental conditions (temperature, humidity) are in the recommended range.
See Environmental specifications on page 142 .
Horizontal lines across the image (banding)
If your printed image suffers from added horizontal lines as shown (the color may vary):
1. Check that the paper type you have loaded corresponds to the paper type selected in the front
panel and in your software. See View information about the paper on page 39 .
2. Check that you are using appropriate print-quality settings for your purposes (see Printing
on page 42 ). In some cases, you can overcome a print-quality problem merely by selecting a
higher print-quality level. For instance, if you have set the Print Quality slider to Speed, try setting
it to Quality.
3. Print the Print Quality Diagnostic Report. See The Print Quality Diagnostic Report on page 79 .
4. If the printhead is working correctly, perform paper advance calibration: see Recalibrate the
paper advance on page 87 .
If the problem persists despite all the above actions, contact your customer service representative for
further support.
ENWW General printing advice 107