Control panel diagnostic flowcharts ................................................................ 226
Touchscreen black, white, or dim (no image) ................................. 227
Touchscreen is slow to respond or requires multiple presses to
respond ........................................................................................... 228
Touchscreen has an unresponsive zone ........................................ 229
No control panel sound ................................................................... 230
Home button is unresponsive ......................................................... 231
Hardware integration pocket (HIP) is not functioning (control
panel functional) ............................................................................. 232
Tools for troubleshooting .................................................................................................................. 233
Individual component diagnostics .................................................................................... 233
LED diagnostics .............................................................................................. 233
Understand lights on the formatter ................................................. 233
Engine diagnostics .......................................................................................... 238
Defeating interlocks ........................................................................ 238
Disable cartridge check .................................................................. 239
Engine test button ........................................................................... 240
Paper path test ................................................................................................ 240
Paper path sensors test .................................................................................. 241
Manual sensor and tray/bin manual sensor tests ............................................ 243
Manual sensor test ......................................................................... 243
Tray/bin manual sensor test ........................................................... 247
Print/stop test .................................................................................................. 250
Component tests ............................................................................................. 250
Control panel tests .......................................................................... 250
Component test (special-mode test) ............................................... 250
Finishing accessory component test .............................................. 254
Scanner tests M880 ........................................................................................ 287
Scanner tests .................................................................................. 287
Diagrams ......................................................................................................................... 289
Block diagrams ................................................................................................ 289
Location of connectors .................................................................................... 303
DC controller PCA connectors ........................................................ 303
High-capacity input (HCI) feeder controller PCA connectors ......... 307
1x500-sheet and 3x500-sheet paper feeder controller PCA
connectors ...................................................................................... 309
Finishing accessories PCA connectors .......................................... 311
Plug/jack locations .......................................................................................... 316
Locations of major components ...................................................................... 318
Base product .................................................................................. 318
High-capacity input (HCI) feeder .................................................... 321
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