HP LaserJet 4 Service Manual - Page 438

defect Ruler 7-67 defect template 7-67 developing station, drum 5-22 DHHS laser safety 1-8 Diagnostics B-28 diagrams, timing 5-34 disassembly, fuser 6-47 display language, changing 3-28, B-30 distorted print 7-35, 7-42 documentation, related 1-7, B-8 DOS commands serial 7-53 DOS Utilities 3-42 Drum cleaning station 5-18 conditioning station 5-19 developing station 5-22 photosensitive 5-17 Rotation Check 7-50 sensitivity 5-17 transferring station 5-24 writing station 5-20 dtr polarity 3-34 dtr/dsr 3-34 Duplex components A-14 covers A-9 electrical block diagram A-5 installation A-6 overview A-2 printing A-3 removal and replacement A-8 E EconoMode 3-16, 4-6 ENGINE TEST 7-A envelope feeder 5-4 installation 3-49 envelopes 2-6 error infrared B-41 Error Map for LJ 5 7-A - 7-D Error messages MP/PC/LC LOAD 7-13 troubleshooting 7-2 ESD 6-1 European Customer Support Center (ECSC) 1-14 European formatter installation 3-22 exhaust fan motor 5-10 Explorer 3-33 F FACTORY DEFAULTS 7-A faint print 7-35 faint print 7-38 Index-2 fan checks 7-34 failure 7-34 motor signals 5-10 removal 6-39 faulty registration 7-39 fax information service (HP FIRST) 1-12 feed guide assembly 6-62 replacing 6-68 Finland laser safety 1-10, B-9 firmware date code 3-26 flash SIMM B-29 flashing indicators 3-2 FM1 7-34 exhaust fan motor 5-10 font door cover 6-10 formatter PCA removal 6-29 pca, functional overview 5-12 system 5-12 formatter cage removal 6-27 formatter system 5-1 functional check half self-test 7-49 laser/scanner assembly 7-32 lower cassette 7-24 main motor 7-33 PS2 7-17 functional overview, formatter 5-12 functional test, pickup motor (m2) 7-23 fuser assembly configuration 6-48 life expectancy 4-2 parts location 6-48 PM 4-3 removal 6-22 thermoswitch removal 6-55 fuser bulb replacement 1-47 fuser disassembly 6-47 fuser malfunction 7-29 fusing process 5-25 station 5-25 temperature 5-2 fusing roller heat lamp removal 6-49 G gear assembly removal 6-38 H half self-test functional check 7-49 handshaking 3-34 hardware 6-2 descriptions 6-3 heat lamp 6-49