Horizontal line....................................................................................................................215 White horizontal line..........................................................................................................215 Color missing ....................................................................................................................216 Blank spots........................................................................................................................216 Poor fusing.........................................................................................................................216 Image distortion.................................................................................................................217 Color misregistration..........................................................................................................217 Smearing...........................................................................................................................218 Misplaced image................................................................................................................218 Reversed color...................................................................................................................218 Snail tracks........................................................................................................................218 Repetitive-defects troubleshooting.....................................................................................................220 Interface troubleshooting....................................................................................................................222 Communication checks......................................................................................................222 EIO troubleshooting...........................................................................................................222 Service menu.....................................................................................................................................223 Using the Service menu.....................................................................................................223 Clear event log...................................................................................................................223 Total page count................................................................................................................223 Serial number....................................................................................................................223 Diagnostics menu...............................................................................................................................224 Diagnostics.........................................................................................................................................225 LED diagnostics.................................................................................................................225 Diagnostics mode..............................................................................................................225 Diagnostics that put the engine into the special diagnostics mode...................226 Diagnostic tests.................................................................................................................226 Individual diagnostic tests..................................................................................................227 Print the event log page....................................................................................227 View the event log on the control-panel display................................................227 Print the print-quality (PQ) troubleshooting pages............................................228 Disable cartridge check (special mode test).....................................................228 Paper-path sensor test......................................................................................228 Paper-path test..................................................................................................228 Manual sensor test (special mode test)............................................................229 Component test (special mode test).................................................................230 Print/Stop test....................................................................................................232 Test pages..........................................................................................................................................233 Engine test page................................................................................................................233 Formatter test....................................................................................................................233 Half-self test.......................................................................................................................233 Drum-rotation test..............................................................................................................234 Engine resets.....................................................................................................................................235 Engine resets.....................................................................................................................235 Cold reset..........................................................................................................235 NVRAM initialization..........................................................................................235 Hard-disk initialization.......................................................................................236 Service ID...........................................................................................................................................237 Converting the Service ID to an actual date......................................................................237 ENWW vii