HP 8550 Service Manual - Page 59

Automatic gradation adjustment To change the automatic gradation adjustment 1 Press the key. 2 Press ADJUSTMENT/CLEANING. 3 Press AUTO GRADATION ADJUSTMENT. 4 Press TEST PRINT 1. The message PRINTING TEST PRINT 1 appears on the copy module touch screen display. 5 Place the page from Test Print 1 on the copy module glass, face- down, with the black portion of the page aligned with the orange arrow, and then press SCAN. SCANNING appears on the display if the page was placed on the glass correctly. If not, CORRECTLY PLACE THE TEST PRINT ON THE GLASS appears; adjust the placement of the page and press OK. 6 After the page has been scanned, remove it from the copy module glass. 7 Repeat steps 4 through 6 for Test Print 2. 8 Repeat steps 4 through 6 for Test Print 3. 9 When scanning of Test Print 3 is complete, SCAN IS COMPLETE appears on the display for approximately two seconds. Cold reset To perform a cold reset on the print engine portion of the HP Color LaserJet 8550MFP, see the HP Color LaserJet 8500/8550 Printer Family Service Manual. Cold reset on the copy module is useful in three circumstances: l after replacement of the firmware dual inline memory modules (DIMM) l after replacement of the reader controller printed circuit board (PCB) l if a system settings password has been set and forgotten For more information about cold resets, see page 96. EN Copy module functionality 57