HP Color LaserJet Enterprise CM4540 Service Manual - Page 870

low-voltage power supply 16 motors 9 See also jams fan control document feeder/scanner 71 fan timing sequence document feeder/scanner 72 fans cartridge, removing 222 DC controller 10 delivery, removing 228 exhaust 10 exhaust, removing 256 intake 10 locations 442 Power-supply fan, removing 236 scanner, removing 197 fax feeding problems 640 FCC regulations 798 feed speed control 51 feed, paper. See pickup, feed, and delivery feeding problems 640 Finnish laser safety statement 809 firmware date codes 466 version information 464 firmware upgrades 650 firmware, downloading new 651 flowcharts troubleshooting 369 formatter operations 2 PCA, removing 106 resets after replacing 625 formatter lights 374 fuser components 16 control-circuit function 16 discrepancy detection 19 failure detection 19 identification 19 jam causes 598 jams 591 life detection 20 motor, removing 290 temperature control 17 See also fusing and delivery unit fusing and delivery unit operations 52 See also fuser; pickup, feed, and delivery fusing process 30 H halftone control 39 hard drive removing 108 hard drive, removing 108 heartbeat LED 375 heat control for fuser 17 heaters, fuser 16 high-voltage power supply bias generation 12 circuits 12 operations 12 removing, lower 250 removing, upper 286 HP Customer Care 792 HP Jetdirect print server configuration page 464 lights 374 humidity requirements 795 I image data path document feeder/scanner 73 image placement accuracy 795 image quality issues examples and solutions 614 image stabilization controls 39 image-formation process development process 28 drum cleaning 31 fusing process 30 ITB cleaning 31 laser-beam exposure 28 pre-exposure 27 primary charging 27 primary transfer process 29 secondary transfer process 29 separation process 30 steps 26 imaging drums color drums disengagement 33 diagnostic test 376 initial rotation period 4 input trays optional, operations 61 installation date calculation 627 verify for optional accessories 462 intake fans 10 interconnect board (ICB) removing 239 interface ports locating 430 interlocks defeating 375 intermediate cover removing 229 intermediate transfer belt (ITB) components 34 home position 35 operations 34 internal clock errors 474 inverter PCA, removing 188 IPTU PCA, connectors 436 IPv4 information 464 IPv6 information 464 IPX/SPX information 465 ITB motor, removing 292 ITB cleaning 31 J jam detection 3-bin stapling mailbox 90 document feeder/scanner 74 jams detection in paper feeder 68 detection sensors 58 diagnostic test for 378 document feeder 584 document feeder access cover, removing 153 duplex area 600 fuser 591 fuser area 598 lower-right door 597 output area 585 output bin 589 preventing 581 recovery 608 right door 591 818 Index ENWW