Secondary service menu....................................................................................118 Printed image quality problems..........................................................................................119 Improving print quality........................................................................................119 Paper Types menu............................................................................119 Print Modes menu.............................................................................120 Print quality menu..............................................................................121 Understanding print-quality settings...................................................................121 To temporarily change print-quality settings.....................................122 To change print-quality settings for all future jobs............................122 Identifying and correcting printed image defects...............................................122 Print-quality checklist.........................................................................122 Paper handling issues........................................................................................................123 Wrong size/type media.......................................................................................123 Cannot select a tray or feature to use................................................................123 Performance problems.......................................................................................................123 Functional tests (SERVICE ONLY).....................................................................................................125 Engine test print..................................................................................................................125 Service mode functions (SERVICE ONLY).........................................................................................126 Cold reset............................................................................................................................126 NVRAM initializer................................................................................................................126 Super NVRAM initializer.....................................................................................................126 Restoring page counts and serial number..........................................................................127 Cleaning the ETB................................................................................................................127 Troubleshooting tools..........................................................................................................................128 Printer pages and reports...................................................................................................128 Demo page.........................................................................................................128 Configuration page.............................................................................................129 Event log............................................................................................................131 Supplies Status page.........................................................................................131 Fuser cleaning page...........................................................................................132 Print quality troubleshooting pages....................................................................132 Control panel messages (error codes)..............................................................132 Alert and warning messages.............................................................132 Critical error messages.....................................................................133 Supplies messages...........................................................................134 Status messages................................................................................................................137 Status log only messages...................................................................................................137 Service menu......................................................................................................................137 Restoring the factory-set defaults......................................................................138 To restore the factory-set defaults....................................................138 General print quality issues................................................................................................138 Solving issues with color documents..................................................................................142 HP Toolbox..........................................................................................................................................144 HP Toolbox.........................................................................................................................144 To view HP Toolbox...........................................................................................144 Troubleshooting tab...........................................................................................144 Print quality troubleshooting pages....................................................................................144 Printer calibration................................................................................................................144 Cleaning page.....................................................................................................................144 Configuration page..............................................................................................................145 vi ENWW