HP Color LaserJet 9500 Service Manual - Page 345

Table 56. Lines and bands (continued) Bands/dark lines (50/ 100 mm bands) A T1 vibration exists. 1 Make sure that the media being used is within specifications. See "Media specifications" on page 31 in chapter 1. 2 Make sure that the media type setting on the control panel is appropriate for the media being used. Bands/dark lines Cardstock band (37 mm from trailing edge of ledger, and 115 mm from trailing edge of letter, on media heavier than 120 g/m² printed in full speed modes) Bands of gloss or density differences repeating at fuser frequency (149 mm or 140 mm) Band (scan direction ripple) 3 A T2 nip vibration causes 1 band at T1. 2 3 A flat spot on the fuser 1 roller is caused by unplugging the printer 2 (rather than using the power button to turn it off). The ITB is defective. z Change the high coverage 3 setting (CONFIGURE DEVICE, OPTIMIZE MENU) to ON, which slightly increases the OPC/ITB speed mismatch. Make sure that the media being used is within specifications. See "Media specifications" on page 31 in chapter 1. Make sure that the media type setting on the control panel is appropriate for the media used. Change the high coverage 3 setting (CONFIGURE DEVICE, OPTIMIZE MENU) to ON, which slightly increases the OPC/ITB speed mismatch. Correct the cause of the power interruption. Replace the fuser. Replace the ITB. Dark lines 3 to 5 mm apart perpendicular to the feed direction (lines are heaviest in the middle of the page) ENWW Chapter 7 Troubleshooting 343