HP Laserjet 5 Service Manual
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standard 1-3 internal assemblies 8-10, 8-12, 8-14 control panel 6-11 delivery assembly 6-13 exit roller assembly 6-12 face-up/face-down lever 6-21 fuser exit roller 6-22 fuser pressure plate 6-15 heating element 6-17 pressure roller 6-20 internal typefaces 1-3 INTR, printer timing 5-19 J Japanese VCCI Statement B-4 L laser and scanner drive 5-5 laser drive 5-5 laser safety information B-1 Laser Safety, USA B-1 laser statement, Finland B-2 loss of detail 7-17 LSTR, printer timing 5-19 M main wiring diagram 7-29 maintenance 4-1 to 4-8 Material Safety Data Sheet, MSDS B-3 memory buffer 5-11 MEt 1-3, 5-10 printer 1-3, 5-8, 5-10 RAM 5-8 ROM 5-8 upgrades 8-5 memory cards (DRAM) installation 6-5 memory enhancement technology 5-10 described 5-10 MEt 5-10 microswitch SW101 5-5 SW201 5-5 model number 1-4 model, printer 8-3 motor described 5-5 MSDS B-3 N North American Response 1-13 O operating environment 2-3 operation, basic sequence 5-19 ordering related 1-10 ordering consumables 8-4 ordering parts 1-10, 8-3 output components 8-14 overcurrent dc protection circuitry 5-6 devices 5-6 protection 5-6 overvoltage devices 5-6protection 5-6 ozone emission B-3 P page protect described 5-11 disabled 5-11 page buffer 5-11 PCL printing 5-11 page usage, monthly 1-3 paper capacities 1-3 paper curl 7-26 paper feed system clutches and sensors 5-17 described 5-15 paper path 5-16, 7-5 paper jam DC controller 5-18 messages 7-7 toner 4-8 paper jam detection described 5-18 paper motion, control 5-5 paper motion, monitoring 5-5 paper path components 7-5 location 5-16 troubleshooting 7-27 paper sensors 5-5 parallel interface described 5-8 parts HPD 1-11 ordering 1-10, 8-3 Parts Direct Ordering 8-3 PDO, Parts Direct Ordering 1-11, 8-3 phone numbers 8-4 SME, Support Materials Europe 1-11 Parts 1-10 parts and diagrams 8-1 to 8-26 Parts Direct Ordering 8-3 parts lists 8-3 PDO, Parts Direct Ordering 1-11, 8-3 phone numbers, parts 8-4 photosensitive drum 5-13 check list 7-22 damage 7-13 described 5-13 located 7-23 photosensitive drum cleaning 5-12 to 5-13 photosensitive drum conditioning 5-12 to 5-13 pickup roller assembly 8-18 PJL overview 5-11 PJL, Printer Display Language Centronics cabeling 5-11 described 5-11 print environment settings 5-11 two-way communication 5-11 power surge 1-15 power control 1-3 power distribution, AC 5-6power save mode 1-3, 5-6 power supply system 5-4 preliminary troubleshooting 7-3 print environment settings, PJL 5-11 print quality cleaning printer 4-6 transfer roller 4-7 print quality problems 7-14 all blank pages 7-18 background scatter 7-16 black page 7-16 blank page 7-18 character voids 7-16 dropouts 7-17 faded print 7-14 half blank page 7-17 horizontal stripes 7-15 loss of detail 7-17 repetitive defects 7-15 staining 7-14 vertical lines 7-15 vertical white stripes 7-15 print resolution 1-3 print speed 1-3, 5-8, 5-10 printer buffer memory 5-11 cleaning 4-6 fonts 1-3 memory 1-3, 5-8, 5-10 memory upgrade 8-5 MEt 5-10 model number 1-4 optional memory 1-3 reset 3-11 standard memory 1-3 warranty 1-14 warranty 1-15 warranty exclusions 1-14 printer comparison memory 1-3 printer dimensions 1-3, 1-6, 2-4 printer features 1-3 internal typefaces 1-3 memory 1-3 monthly usage 1-3 speed 1-3 printer functions, basic 5-3 printer job language, PJL 5-11 printer message troubleshooting 7-7 printer messages control panel 7-8 error 7-8 manual feed 7-7 memory error 7-7 paper out 7-7 Ready 7-8 self test 7-8 status 7-8 toner cartridge 7-7 troubleshooting 7-7 printer space requirements 2-4 printer timing 5-19 INTR 5-19 LSTR 5-19 Index Index-2
PRNT 5-19 STBY 5-19 WAIT 5-19 printing self test page 3-7 priority of errors 7-7 PRNT, printer timing 5-19 product information 1-1 to 1-16, 3-1 to 3-12 product overview 1-7 R radio frequency interference, RFI B-4 RAM 5-8 described 5-8 random access memory described 5-8 read only memory described 5-8 ready light 3-3 regulatory information B-1 to B-4 related documentation 1-10 to 1-11 remanufactured assemblies 1-10 removal and replacement back cover 6-6 bottom assemblies 6-42 conductive grease 6-20 control panel 6-11 covers and doors 6-6 DC Controller 6-44 delivery assembly 6-13 EP Door 6-8 exit roller assembly 6-12 face-up/face-down lever 6-21 feed assembly 6-39 formatter pca 6-47 fuser exit roller 6-22 fuser pressure plate 6-15 heating element 6-17 internal assemblies 6-11 kick plate 6-35 laser/scanner assembly 6-24 main cover and paper input assembly 6-10 memory door 6-9 memory door guide 6-42 motor 6-43 paper exit sensor flag 6-23 paper feed frame 6-30 pickup roller assembly 6-27 pressure roller 6-20 separation pad 6-37 solenoid 6-25 strategy 6-3 subpads 6-38 top assemblies 6-24 transfer roller 6-34 repair philosophy 1-10 repetitive defects 7-15 repetitive image defect ruler 7-28 replaceable cables 8-6 required tools 6-4 requirements environmental 2-5site 2-1 to 2-6 space 2-4 resetting the printer 3-11 Resolution Enhancement technology 1-3, 5-9 described 5-9 resolution, print 1-3 REt, Resolution Enhancement technology 1-3, 5-9 ROM 5-8 character sets 5-8 dot patterns 5-8 S safety toner B-3 scanner drive 5-5 self test engine 3-10 microswitch SW201 5-5 self test page 3-7 sensors 5-17 separation guide assembly 8-22 sequence of operation 5-19 serial number information 1-4 service approach 1-10 service errors 7-7 service or error messages beam error 7-11 engine 7-11 firmware 7-12 formatter 7-12 fuser 7-10 ROM or RAM 7-10 scanner 7-12 site requirements 2-1 to 2-6 SME, Support Materials Europe 1-11 solving print quality problems 7-14 space requirements 2-4 specifications electrical 1-6 paper 1-11 printer 1-6, 2-3 staining 7-14 standard interfaces 1-3 standard printer memory 1-3 status messages door open or no EP cartridge 7-8 incompatible memory card 7-8 manual feed 7-8 memory error 7-8 paper jam 7-8 paper out 7-8 Ready 7-8 SleepMode 7-9 STBY, printer timing 5-19 supplies 8-5 See alsoaccessories and supplies surge protection 1-15 SW101, 12 volt dc power shutoff microswitch 5-5 SW101, printer door microswitch 5-5SW201, engine test microswitch 5-5 T technical assistance 1-12 test, engine 3-10 toner 1-10 toner cartridge charging rollers B-3 check list 7-13 cleaning spills 4-8 defective 4-8 described 5-13 drum cleaning 5-12 to 5-13 drum conditioning 5-12 to 5-13 drum rotation check 7-23 faulty image exampes 7-14 image formation 7-13 image formation system 5-13 MSDS B-3 photosensitive drum 5-13, 7-13, 7-22 to 7-23 printer message 7-7 refilled 7-23 replacement 8-5 weight 7-13 toner cartridge microswitch, SW101 5-5 toner safety B-3 tools required 6-4 top assemblies feed assembly 6-39 kick plate 6-35 laser/scanner assembly 6-24 paper feed frame 6-30 pickup roller assembly 6-27 separation pad 6-37 solenoid 6-25 transfer roller 6-34 transferring process 5-14 troubleshooting 7-1 to 7-32 drum rotation 7-23 high-voltage power supply check 7-24 image defects 7-28 image formation 7-13 LEDs 7-7 paper curl 7-26 paper path 7-27 print quality problems 7-14 printer errors 7-7 troubleshooting checks 7-21 troubleshooting flowchart 7-3 troubleshooting tools 7-27 troubleshooting, preliminary 7-3 two-way communication, PJL 5-11 typefaces internal 1-3 V VCCI Statement, Japan B-4 vertical lines 7-15 vertical white stripes 7-15 voltage conversions 1-15 W WAIT, printer timing 5-19 Index Index-3
warning messages 6-3 warranty exclusions 1-14 limitations 1-15 start date 1-15 voltage 1-15 warranty 1-14 wiring diagram 7-29 wiring diagrams, main 7-29 writing process 5-13 Index Index-4
Printed on Recycled Paper *C3990-90991* *C3990-90991* C3990-90991 HP LaserJet 5L and 6L Printer Service Manual Copyright© 1997 Hewlett Packard Co. Printed in USA 9/97Manual Part No. C3990-90991 HP LaserJet 5L and 6L Printer (C3941/C3990) Service Manual