ver.4 CLJ4700 / CLJ4730MFP PQ Defect Guide
Contents
1. Customer may be printing with adhesive labels that are either defective out of spec or previously used The adhesive gets transferred to the OPC and then to the charge roller Troubleshooting and Suggestions Print the PQ Troubleshooting Suite and examine the white page Identify what color dot is repeating down the page to identify which print cartridge is causing the defect If unable to determine color remove one cartridge at a time using disable cartridge check feature to isolate the cartridge Recommended Parts Educate the customer that some brands of labels are more prone to create this problem than others and that labels cannot be reused or fed through the printer more than once Replace the cartridge one time only due to this issue for customer satisfaction top Cleaning Blade Streaks Figure 17 Streak cleaning blade T hoe CPS Popertddt Pujer steel Times d art E 13 4 Pagexitalt H ti ot Tw tagat eee m teetti P Medi nai 1 r Psie le Mrd la Aen ime v m Defect description Dark vertical lines that are usually continuous all the way down the page The line is the color of the waste toner from the respective cartridge The dark line will show up over the top of solid filled areas as well as non printed areas including the margins Contributing Condition Cold temperature Printing in dusty environments and starting the printer below 15 Centigrade Possible Causes There are t2. K cartridges as the paper is transported toward the fuser Contributing factors are duplex media and media condition environment toner charge and cartridge life Troubleshooting and Suggestions Transfer settings have been fine tuned on the HP CLJ 4700 amp 4730 MFP to reduce retransfer Additional changes to transfer settings may have the undesirable side effect of producing poor transfer In addition to transfer settings the environmental sensor in the printer is also used to adjust transfer settings to reduce retransfer Poor transfer is evident mainly on heavier media and will show as a mottled appearance on primary color heavy fill areas A retransfer optimize mode was created and is accessible through the front panel It may produce a higher incidence of poor transfer especially in solid primaries but it may help reduce mottle in solid secondary colors such as green and red Recommended Parts Further improvement is not possible at this time For customer satisfaction however a one time cartridge replacement may need to be performed However this is not advisable since it is a temporary fix it s not a problem with the toner cartridge It may not be possible to eliminate this problem top Random Bands Figure 14 Banding Random bands C eS weet tee Sees 11 43 30 K Le aot td a mh ns p Siira urg Mer a iasad 48 re ea R acs Tei 5 S mamidityvit Defect description Dark horizontal bands visible in hal
3. OPC drum 2 Poor or incomplete transfer of toner from the OPC drum to the paper This can occur from using too thick or too thin of media Troubleshooting and Suggestions 1 Replace toner that is near end of life or has low status 2 Make sure the media attraction roller MAR is not contaminated with toner and the ends of the roller shaft are properly seated into the holders on the ETB assembly 3 Make sure the transfer rollers beneath the belt on the ETB one for each color are properly installed and seated 4 Make sure the print mode matches the media type 5 Try using different media If the customer is using thick media try using thinner media If the customer is using thin of media try using thicker media Recommended Parts Replace cartridge if cartridge is near end of life If MAR or transfer rollers need adjusting make adjustments Educate the customer on trying different media types top Snail Tracks Slugs Fuser Figure 4 Snail Tracks Defect description Streaks that meander but are mostly parallel to the process direction The streaks resemble a track mark made by a snail or to water droplets along the page Contributing Condition Printing in High Temperature High Humidity environment and or with paper media which has been exposed to High Temperature High Humidity environment Possible Causes Acclimated media contains more moisture causing it to curl or wave as it enters the fuser The sn
4. VX p V r 4 EMO ysi Stee SQ oSsPStts E 20 Bs S Se S aK Se Sm ROSES oS E Secon ve M Sasa L a st Oy CO stn i AN OW VOR KS ode SON a ae SAP Sse DOO SE St Sv tu PA 180 Om amp sO sATA ons tag Nv 1 91001080 ae noe ng DOW Mono o oo en N i NND NN POA sept N POT toma nnn aj NONO S NO SN 00 O 4 am AIT Ce N A KN E ES Pe I Kot EA ey MTNSSONS Aso S HAAN Tin NASS on co ied en S Non hen Seni Oued male 7 LAN NO Sn NN in O A no SSN NAN H SSS r nnoo0n c Neininnioe Defect description Text and image ghost are visible at 76 mm pitch from original text or images Contributing Condition Printing in duplex mode and or Low Temperature Low Humidity environment can also occur in other environments as well Possible Causes Toner is electrostatically attracted from the paper to the fuser sleeve and then redeposited onto the paper after one circumferential rotation of the sleeve 76 mm Troubleshooting and Suggestions 1 Use Fresh unpacked Media 2 If printing with rough paper change fuser mode from rough to normal via the front control panel Recommended Parts None top Gloss Band Hot Offset Fuser Figure 9 Gloss Bands eT i i sits Defect description A wide horizontal band with a higher gloss level more shine appears within 76 mm from the leading edge of the media Appears in solid fill colors printed in plain and gloss modes Contri
5. as associated with this failure If failure is associated with a 10 92 xx error in the event log see 10 92 00 and black color plane missing document This error is associated with only the black color plane 3 Run the laser scanner motor test to make sure that the laser scanner is working correctly If the laser scanner is not working replace the laser scanner for the associated color 4 Ifthe main drive assembly has recently been removed follow the steps in the service manual to realign the gears on the main drive assembly 5 If in yellow and the paper feed assembly has recently been removed check that the cable cover is installed properly 6 See the service advisory on this issue for replacement of the OPC gears NOTE Do not replace the print cartridge for this issue unless it indicates an order or replace message Recommended Parts If all other issues have been ruled out replace the OPC grounding springs per the service advisory top Toner scatter Figure 28 Typical leading edge forward scatter on heavy media in dry environment 1 Leading edge 2 Feed direction 3 Forward scatter Defect description Printed text appears to be fuzzy especially black text superimposed over colored background Most commonly seen when duplexing Possible Causes This scatter is most common with dry paper conditions that can occur in low humidity environments or when printing on both sides It is most common
6. is not the resulting copy may contain a moir pattern but the dark blotchy areas will be gone 4 Once the issue is verified upgrade to at least firmware version 46 121 2 which resolves this issue Recommended Parts Do not replace any parts Upgrade to at least firmware version 46 121 2 which resolves this issue top
7. 2 WARNING The information contained in this guide is HP and Channel Partner Use Only One of the goals in creating this guide was to capture and preserve PQ defect corner cases these are isolated cases for specific print quality defects top How to Properly Define PQ Issues e Repetitive Defect Only refers to dots dashes or scratches that repeat at the interval This does not include any horizontal or vertical lines e Banding Only refers to a horizontal line or horizontal hue shift not dots dashes or vertical lines e Streaks Only refers to a vertical line No dots dashes or horizontal lines Repetitive Defect Distances Replacement Part Roller Print Cartridge Developing cylinder Primary charging roller Print cartridge or tranfer roller if the defect occurs in only one color the Print Cartridge defective part is the print cartridge if the defect occurs in all colors the defective part is the ETB Print Cartridge Toner feed roller ETB Media attaching roller Fuser Fuser sleeve Fuser Fuser pressure roller Print Cartridge Photosensitive drum Print I mage Formation Troubleshooting Collecting Print Samples from U S Customers Distance 34 3 mm 1 35 inches 37 7 mm 1 48 inches 42 7 mm 1 68 inches 75 0 mm 2 95 inches 76 0 mm 2 99 inches 81 0 mm 3 19 inches 94 2 mm 3 71 inches If the customer is experiencing any print quality issues we need print samples I
8. 405 w ay wil aubay 1000 018404 RIRAL Lj SSAfDY anA pres may ach gutsy Atat P Y 1 Paen LIN YONI Ob TY NI mais men e iver 0 SOs dw aGey Hauger peppequig KIOJUUA OOLP 19040507 JOJOI dH A 1 Paper motion 2 Faded blue No black Figure 26 Faded yellow typical of misaligned cable cover k Oss hin a Bo oss 04 TETE TIO hee Figure 27 Partial color plane typical of poor OPC grounding image Partial color plane cyan _ Fdut Aptoriouts KI LSA n F si i eae Ka tii i tite tipi Hi Hiii F 4 a iiy 119 t fito JA Full Missing color plane typical of poor OPC grounding image Missing color plane cyan N Fdut Aploriouis LSA 322353 fy e ke e Defect description Images appear to change color or completely fade away either from side to side or top to bottom Possible Causes 1 OPC grounding spring not making adequate contact In this case additional defects that may occur intermittently along with this in the same color are edge to edge banding and light dark bands 20mm apart 2 Main drive assembly was not aligned properly during reinstallation 3 If in yellow improper reinstallation of the cable cover on the paper feed assembly Troubleshooting and Suggestions 1 Be sure the cartridge is not low or running in override mode 2 Verify 10 92 xx error does not appear in event log
9. HP Color Laser et 4700 and 4730 MFP Series Products PQ Defects Guide Overview Fine Line Segments Banding 5 88 mm pitch Poor Transfer Mottle Snail Tracks Slugs Fuser Rain dark OPC 94 mm pitch Rain white OPC 94 mm pitch Banding OPC 94 mm pitch sharp bands Offset Fuser Electrostatic Gloss Band Hot Offset Fuser Banding CMY developer hue shift 38 5 mm pitch Banding K developer hue shift 34mm pitch Background Toner Front side Re Transfer Cyan Random Bands Snake Bite 38 mm Repetitive Spot Label Adhesive Cleaning Blade Streaks Marks across page Fuser 110 Volts in 220 Volts Backside Tick Marks Fuser OPC 94 mm Ghosting Developer 38 34 mm Ghosting Streaks fine developer Partial or missing color plane Toner scatter Breakdown chicken tracks Discharge marks Similar to chicken tracks Banding small pitch less than 2 4 mm Banding OPC Light Damage 94 mm pitch Color Toner Missing from Color Documents Edge to Edge Solid Bands Light and dark bands on page at 20mm offset Scan Copy Image Formation Troubleshooting ADF Streaks Dark Blurry Copies or Scans Overview Welcome to the HP Color Laser et 4700 and 4730 MFP Series Printers PQ Defects Guide This guide will be updated as needed to reflect new information Updated May 02 2006 Document number c0057142
10. ail tracks are due to the difference in the toner density caused by the shape of the media Troubleshooting and Suggestions 1 Try a sealed fresh ream of paper 2 Use approved 75 g m or heavier media 3 Decrease ambient humidity and temperature Recommended Parts None top Rain dark OPC 94 mm pitch Figure 5 Rain OPC Defect description Small specks of toner that are visible at 94 mm pitch spacing Possible Causes OPC contamination causes toner to stick to the OPC surface which does not get properly cleaned off by the cleaning blade This creates small dots on the page that repeat at 94 mm It is usually difficult for the customer to detect the 94 mm repetitive interval on the page Troubleshooting and Suggestions The rain can come and go as the contamination may be cleaned off over time The defect seems to occur more frequently during long continuous print jobs Recommended Parts Replace the cartridge top Rain white OPC 94 mm pitch Figure 6 Rain white e e TP 1063 03 Leading Edge Notes N Defect description Small specks of missing toner that are visible on a solid fill area at 94 mm pitch spacing Possible Causes OPC contamination causes toner to stick to the OPC surface which does not get properly cleaned off by the cleaning blade This creates small white dots on a solid filled area on the page that repeat at 94 mm It is usually difficult for the customer t
11. as a LED that shines into a light pipe which illuminates the photoconductive drum as it rotates Anything that stops light from reaching the photoconductive drum will cause a ghost This could occur by light pipe breakage hardware failure of the LED or associated circuitry or by obstruction of the light between the engine and the light pipe by toner or by a broken mechanism Troubleshooting and Suggestions 1 Attempt to isolate which cartridge or cartridges are producing the ghosting image Disable cartridge check function can help facilitate this 2 Check to see if the light pipe is in any way dislodged from its normal position on the cartridge 3 Try using a soft tissue to clean any toner dust or debris accumulation away from the light emitting length of the light pipe If the customer is using heavy glossy media or heavier slicker media in a high temperature high humidity environment this has been found to be one of the most frequent causes so ask the customer to try different media either lighter or less glossy Lastly check the contacts between the ETB and the engine the copper contacts on the left side of the ETB and the spring contacts to the left of the cartridges Recommended Parts As a last resort replace the cartridge responsible for the ghosting NOTE A cartridge may not fix the problem and if the problem occurs with the new cartridge the printer may require on site diagnosis Developer 38 34 mm Gh
12. buting Condition Hot offset occurs on glossy media because the temperature of the fuser pressure roller is higher when intermittently printing short jobs over a long period of time Possible Causes The fuser sleeve surface temperature is hotter for the initial rotation 76 mm of paper travel but then becomes less hot as the fuser heater can not maintain the initial temperature due to the low thermal mass of the instant on fuser The increased gloss corresponds to the hotter sleeve temperature during the initial 76 mm rotation Troubleshooting and Suggestions 1 Try printing a couple of pages prior to print job to allow instant on fuser to stabilize fusing temperature 2 Customer can also reduce the fuser temperature to reduced via the control panel This may change the overall gloss level of printed documents Recommended Parts None top Banding CMY developer hue shift 38 5 mm pitch Figure 10 Banding 38 5 mm developer hue shift Defect description Dark horizontal bands typically visible in C M amp Y halftone colors that repeat at 38 5 mm developer roller pitch Possible Causes This is a toner cartridge problem with two causes 1 The developer roller is non concentric and or 2 The developer roller is not perfectly round Troubleshooting and Suggestions Print the PQ Troubleshooting Suite to identify which print cartridge is causing the defect Recommended Parts Replacing the print cartridge may help howeve
13. d Suggestions Isolate problem color and replace corresponding cartridge This may or may not help the defect Can also try changing the humidity in the environment Recommended Parts Toner cartridge Replacing the cartridge may improve the banding but cannot be guaranteed top Banding 5 88 mm pitch Figure 2 Banding 5 88mm pitch CI UOT O U 121 v DN D O gt Y S A gt Bedspreads Tapestries Defect description Dark narrow horizontal bands typically visible in half tone colors that repeat at a small pitch spacing of 5 8 mm Possible Causes Cartridge developer OPC drive gear tooth pitch irregularities Troubleshooting and Suggestions e Print PQ Troubleshooting Suite to isolate color plane producing the defect e If seen in green secondary then replace the cyan main motor e If seen in red secondary then replace the magenta main motor e If seen in black then replace the black main motor The defect will not be seen in yellow Recommended Parts Replace the Drum Drive Motor for the affected color plane top Poor Transfer Mottle Figure 3 Poor Transfer Mottle Defect description Halftone and solid fill toner areas do not have a uniform fill of toner but rather are missing toner which gives a blotchy uneven filled appearance Possible Causes Either or both of the following contribute to poor transfer 1 Poor development of toner from the developer roller to the
14. e Page Content setting for the original to Photo Also setting the darkness to a lighter setting may help and will also save toner Recommended Parts Do not replace any parts for this issue Use the workarounds above top Dark Blurry Copies or Scans Figure 37 Printed image correct OX ur Online Outlet verstock com Liquidation Bins New Arrivals Clearance Bins SEARCH Entire Site v FOR co MYA v w vr 100 BEST PRICE GUARANTEE SHOP WI Checkout Process Review Cart Account Logir Billing amp Shipping Order Complete Figure 38 Copied image dark and blurry Defect description Copies print dark with blurry text and blotchy areas of extra toner Printed documents print correctly and scanned images Scan to Email or Scan to Folder also look correct Possible Causes Calibration failure possibly caused by the ETB transfer rollers not alienating correctly This issue typically occurs following a normal calibration cycle Troubleshooting and Suggestions To isolate the issue 1 Print an Event Log the last calibration cycle will likely have caused 54 xx errors to be logged in the Event Log 2 The issue does not appear when the Page Content of the original is set to Glossy Photo 3 Make a color copy describing the original with Page Content of Glossy Photo to ensure the issue does not appear The original used to make the copy need not be an actual glossy photo However if it
15. ears Troubleshooting and Suggestions Small pitch banding is inherent to the print process due to the meshing of gears Recommended Parts None Reseating or Replacing the cartridge may improve the banding but cannot be guaranteed top Banding OPC Light Damage 94 mm pitch Figure 32 94 mm Banding OPC light damage Defect description Dark narrow horizontal bands Approximately 10 mm wide typically appear in halftone colors at the 94 mm OPC drum pitch interval Contributing Condition Improper storage and light exposure of OPC drum Possible Causes Extended light exposure of OPC drum surface changes charge properties of OPC Troubleshooting and Suggestions Ask the customer if they are storing the cartridges outside the box and or bag Warn the customer that this is the cause and to avoid this in the future The light damage does fade over time but can take awhile Replace the cartridge this first time Recommended Parts Toner cartridge top Color Toner Missing from Color Documents Figure 33 Color missing Defect description Color toner is missing either on the full page or on a portion of the page Color may be evident but extremely faint If calibration occurs while the ETB is in this state two stripes of toner calibration patches may be on the backside of images along with 54 xx errors in the event log Possible Causes The transfer rollers in the ETB are not alienating properly Troubleshooting a
16. een ruled out replace the OPC grounding springs per the service advisory top Scan Copy I mage Formation Troubleshooting NOTE Applicable to the Color Laser et 4730mfp only top ADF Streaks Figure 36 Example of ADF Streaks I all p Defect description Using the automatic document feeder ADF color copies and scans of dark images have blue red and green streaks down the length of the copy or portion of the copy The streaks may not be evident in lighter color tones or where only one color of toner is applied Possible Causes Debris has settled on the glass or in the Mylar scan window in between the page and the scanner If the dust is large and black the streaks will be black If the dust is white the streak will be white If the dust is extremely small it may block only one pixel resulting in red green or blue streaks Troubleshooting and Suggestions 1 Wipe the glass with a lint free rag to remove any dust Warning facial tissue will create more dust Replace the mylar in the ADF scan window Use the flatbed scanner When the flatbed scanner is used the page stays stationary and the scanner moves so even if dust is on the glass streaks will not be apparent Copy in black and white In a black and white scan the small red green and blue lines are not seen and the light gray streaks are less obvious Change the standard copy options An option that may improve the streaks includes changing th
17. f we are replacing an ETB or toner cartridge they get instructions with the Parts Recovery Program that are to be crewed out with the part If we are not replacing the part we need print samples in all instances Collecting Print Samples from Customers in the Rest of the World Please send any print samples that you receive through your normal escalation process If the issue is not resolved and is not currently documented collect the defective part as well for analysis The defect may be added to this PQ Guide If the issue is not currently resolved the print samples may be escalated through to division for further analysis and troubleshooting advice the image formation system is the central hub of teh printer During image formation an image of colored toner is formed and then fused onto the paper The image formation system consists of the following physical components four laser scanner four print cartridges ETB and fuser Fine Line Segments Figure 1 Fine Line Segments Defect description Fine horizontal lines banding in the scan direction similar to fine developer streaks only horizontally creating a linen look Contributing Condition Electrostatic breakdown between cartridge charge roller and the OPC drum creates areas that attract more toner on the OPC Possible Causes If charge roller resistivity is too low out of spec then discharge results creating dark fine line segments Troubleshooting an
18. ftone colors that occur at random pitch spacings Possible Causes Toner build up on the developer roller and or OPC drum causes random impulse banding Troubleshooting and Suggestions The defect should be less visible at the beginning of cartridge life Replacing the cartridge may improve the banding but cannot be guaranteed Recommended Parts Toner cartridge Replacing the cartridge may improve the banding but cannot be guaranteed The defect should be less visible at the beginning of cartridge life top Snake Bite Figure 15 Snake bite sample 1 aan a o Defect description Two irregularly shaped light spots or toner voids that can vary in size from 1 to 4 mm The two spots are in the scan direction and are spaced 26 mm apart and 55 mm from the leading edge of the page Contributing Condition Occurs only when printing from tray 1 Is worse in a High Temperature High Humidity environment with acclimated media Possible Causes Caused by media deformation contamination from the tray 1 pick roller and lift plate contact when feeding Troubleshooting and Suggestions Use freshly opened media Print from another tray Recommended Parts None top 38 mm Repetitive Spot Label Adhesive Figure 16 Repeating dot at 34 mm or 38 mm charge roller adhesive Defect description Defect shows as small irregularly shaped dots repeating down the page at a 38 mm interval OPC charge roller Possible Causes
19. ing print area marks tend to be thin tendrils of disturbed toner and can be up to 20 mm or longer from the leading paper edge The leading edge marks shown in the above image are most easily seen in the black toner but also occur in the color toners NOTE Leading print area or leading edge refers to the first edge exiting the printer and may or may not be the top of the image Trailing Edge Trailing edge marks tend to be obvious fan marks of disturbed toner They can be up to 10 to 15 mm from the tailing paper edge As with the leading edge marks trailing edge discharge marks are most easily seen in the black toner but also occur in the color toners See the above image Contributing Condition Operating the printer in a low temperature low humidity environment and or printing on thin paper or paper which has been fully acclimated to a low temperature low humidity environment In dry conditions electrostatic discharge can occur as paper touches or separates from various surfaces in the printer Discharge can occur when paper goes between rollers as paper separates from the transport belt and as paper is directed with guides and ribs This discharge can disturb the toner on the surface of the paper causing various visible patterns The patterns above typically occur as the paper separates from the ETB and as the paper is guided into the fuser rollers When the paper is captured in the fuser and still electrostatically attached to the pa
20. n Defect description A band or bands of varying width appear randomly on pages from edge to edge Additional defects that may occur intermittently along with this in the same color are partial or complete missing color plane and light dark bands 20mm apart Possible Causes The OPC grounding spring is not making adequate contact Troubleshooting and Suggestions See the service advisory on this issue for replacement of the OPC gears NOTE Do not replace the print cartridge for this issue unless it indicates an order or replace message Recommended Parts If all other issues have been ruled out replace the OPC grounding springs per the service advisory top Light and dark bands on page at 20mm offset Figure 35 Example of Light and dark bands on page at 20mm offset 3 S T a S D v o e n Defect description A light band toner missing followed 20mm s later by a dark band extra toner Additional defects that may occur intermittently along with this in the same color are partial or complete missing color plane and edge to edge banding Possible Causes The OPC grounding spring is not making adeguate contact Troubleshooting and Suggestions See the service advisory on this issue for replacement of the OPC gears NOTE Do not replace the print cartridge for this issue unless it indicates an order or replace message Recommended Parts If all other issues have b
21. nd Suggestions 1 Verify that the color cartridges are not running in Override at Out Mode Print a Supplies Status Page and check for the message Supply Used After Out with OVERRIDE under the cartridge part number When a cartridge is used in this mode the toner may be depleted causing that color to fade 2 Confirm that the image is not merely printed in grayscale If the full image is printed i e if areas that should be printed in color are printed in grayscale then the printer may be experiencing one of the following o The customer may be using a black only print driver o RESTRICT COLOR USE may be set to COLOR IF ALLOWED or DISABLE COLOR through the control panel or EWS o COLOR SUPPLY OUT may be set to AUTOCONTINUE BLACK through the control panel or EWS 3 Verify that all three color planes CMY are missing from or appear very very faint on the Supplies Status Page 4 Set Color Black Mix in the System Setup Menu to the default setting of Auto The Mostly Black Pages setting may exacerbate the issue 5 Open and close and the ETB This will sometimes resolve the issue temporarily so the product will work correctly until a replacement ETB can be obtained Recommended Parts Replace the ETB NOTE Do not replace the print cartridges for this defect top Edge to Edge Solid Bands Figure 34 Example of Edge to Edge Solid Bands 3 a mi a S gt Zz o o E y
22. ne voltage 110 Volt fuser has a white Serial number Label 220 Volt Fuser has a pink Serial number Label Recommended Parts New Fuser with the correct voltage top Backside Tick Marks Fuser Figure 19 Backside Tick Marks Simplex Figure 20 Backside Tick Marks Duplex VAMMA N Defect description Tick marks aligned in one or two streaks on the backside of the page This usually occurs on glossy duplex pages Possible Causes Continuous printing with envelopes or with narrow media could create cuts on the Fuser Pressure Roller Troubleshooting and Suggestions Verify with the customer if cuts are seen on the pressure rollers and if they have been printing with envelopes and or with narrow media Recommended Parts New fuser top OPC 94 mm Ghosting Figure 21 Ghosting OPC Defect description OPC ghosting is when a printed object is discernable further down the page at 94 mm offset from original Possible Causes Photoconductive drum ghost can be caused in different ways 1 Incorrect transfer settings This can occur by running media in an incorrect mode It may also occur if there are hardware problems with the transfer circuitry such as the spring contacts to the ETB 2 Some ghosting may occur on heavy glossy media especially in high temperature high humidity environments This is a consequence of transfer settings being optimized to reduce re transfer 3 Erase failure The printer h
23. ng and Suggestions 1 Replace cartridge w high life or near end of life 2 Avoid higher resistivity or glossy papers 3 Try using an sealed fresh package of paper 4 Try using the background reduction modes 1 and 2 from the front display panel Recommended Parts Replace cartridge if cartridge is near end of life Try another media type top Re Transfer Cyan Figure 13 Re Transfer Cyan Defect description Cyan color halftone and solid fill toner areas do not have a uniform fill of toner but rather are missing cyan toner which gives a blotchy uneven filled appearance This produces a mottled look especially in solid green fills but also occasionally shows up in solid red and solid blue fills The mottling is on a scale of perhaps 1 to 3 mm The phenomenon is worse on glossy media especially on the second side of a duplex page It is worse late in cyan cartridge life and may be aggravated by a yellow cartridge that is fairly new Environment other than normal For Example Low temperature low humidity or high temperature high humidity may also produce more retransfer Contributing Condition Continuous printing stirs toner and degrades the charge properties Also the toner on cartridges that are near end of life have charge properties that are not optimal Possible Causes The transfer order for the colors is Y C M amp K Cyan toner on the paper surface is attracted back retransferred to the OPC drums of the M amp
24. o detect the 94 mm repetitive interval on the page Troubleshooting and Suggestions The rain can come and go as the contamination may be cleaned off over time The defect seems to occur more frequently during long continuous print jobs Recommended Parts Replace the cartridge top Banding OPC 94 mm pitch sharp bands Figure 7 Sharp Band Defect description Horizontal sharp light lines appear at a 94 mm pitch spacing NOTE Dark line appears below the light line in this defect Possible Causes Toner additives and or foreign materials adhere to the contact area of the OPC cleaning blade and the OPC drum surface when the drum is stopped This can be caused when the OPC has not rotated for several minutes After the OPC rotates the defect does go away after a few pages and will stay away during continuous printing Troubleshooting and Suggestions Customer can set front control panel to turn on Pre rotations Go to Configure Device then go Print Quality then Optimize This will avoid the mark but it will cause a slower first page out 20 seconds and will use up cartridge life Recommended Parts None Do not replace cartridge this will not help top Offset Fuser Electrostatic Figure 8 Fuser Offset Electrostatic offset x k X Vat SEK Ze HHH Hey HEH O m ae ope JO Ce x Se Pee ea IK N 3 fe G eg 0 n o lt Le cx Se OX x 2 E E O Re ode Ox X min
25. olve the issue is to try creating a more humid operating environment Recommended Parts None top Breakdown chicken tracks Figure 29 Breakdown chicken tracks Defect description Breakdown chicken tracks simplex mode also called discharge marks are an irregular wave like pattern that resembles a chicken track imprint and appear in lighter halftone image areas Typically at the trailing edge of the page Contributing Condition Printing on thin paper or paper which has been exposed for a long time in Low Temperature Low Humidity environment Operating the printer in low temperature low humidity environments Possible Causes The toner on the paper scatters due to the electrostatic discharging when the trailing edge of the paper separates from the ETB Troubleshooting and Suggestions 1 Use 75 g m 120 g m media 2 Use fresh paper 3 Increase the ambient temperature and humidity Recommended Parts None top Discharge marks Similar to chicken tracks Figure 30 Discharge chicken tracks 1 Typical trailing edge discharge on dry media Defect description Discharge marks can appear at the leading and trailing print areas in lighter halftone image areas which appear as an irregular wave like pattern that resembles a chicken track imprint These discharge marks are most common with dry paper conditions that can occur in low humidity environments or when printing on both sides Leading Edge The lead
26. on heavy media Above is a photo of typical performance on heavy media 65 from a low temperature and low humidity environment The forward scatter is most easily seen in the black toner but can also occur in the color toners Typically seen toward the end of print cartridge life Troubleshooting and Suggestions In low humidity conditions the use of freshly opened media can help reduce the tendency for forward scatter especially for single sided printing Media that has been allowed to dry in the paper trays for extended periods can be susceptible to forward scatter More flexible media will sometimes reduce the forward scatter since its path is more quickly controlled than stiff media Thick media can be especially susceptible to leading edge forward scatter Media with different surface properties will sometimes reduce the amount of scatter The toner and the media surface can tend to hold an electrostatic charge too long on some media and are thus susceptible to discharge in the paper path Scatter may be reduced after printing 100 pages due to the normal toner maintenance process within the print cartridge every 100 pages the toner is stirred to retain the appropriate charge properties Try setting the paper type to light lt 75 g m Replacing the toner cartridge may temporarily solve the problem if seen later in the print cartridge life It may reoccur for the reasons with a replacement cartridge The only way to completely res
27. osting Figure 22 Ghost developer 01 OVA ON UC 0 ILL Po Defect description Developer ghosting is when a printed object is discernable further down the page For ghosting caused by the developer roller the repeated image appears at 38 mm pitch for cyan magenta and yellow and 34 mm for black Possible Causes Developer ghosting is caused by the charge characteristics of the toner Most often it is seen as a ghost of a solid fill cut out like a ghost of white letters in a solid blue field Blue may produce worse results than other colors It is worse early in cartridge life first few hundred pages but may persist Results may be better on the first page of a job than on subseguent copies Troubleshooting and Suggestions 1 Check the printer s transfer settings including print and optimize modes as this can have a significant effect on cartridge ghosting 2 Perform Full Calibrate Now 3 Alternating high coverage and low coverage pages in a job may help Recommended Parts After identifying ghosting cartridge replacing the cartridge may be tried one time only as this may not solve the problem top Streaks fine developer Figure 23 Streaks fine developer TP_A2G3 ps Leading Cage Notes Defect description Thin streaks print in halftone areas These lines may appear in one color cyan or may appear in any combination of colors CMYK Possible Causes This issue is seen towards the end of the car
28. per transport belt the path the paper takes between the belt and the fuser can be controlled and the discharge marks minimized However the leading and trailing edges are difficult to control and discharge can occur as the paper exits the transport belt or touches guides Troubleshooting and Suggestions In low humidity conditions the use of freshly opened media can help reduce the discharge marks especially for single sided printing Media that has been allowed to dry in the paper trays for extended periods can be susceptible to discharge marks If the defect appears in normal environmental conditions T gt 19 degrees C RH gt 20 then more flexible media will sometimes reduce the discharge since its path is more easily controlled than stiff media Thick media can be especially susceptible to trailing edge discharge Media with different surface properties lower surface resistivity will sometimes reduce the amount of discharge The toner and the media surface can tend to hold an electrostatic charge too long on some media and are thus susceptible to discharge in the paper path Recommended Parts None top Banding small pitch less than 2 4 mm Figure 31 Less than 2 4 mm Banding small pitch Defect description Dark narrow horizontal bands typically visible in half tone colors that repeat at a small pitch spacing of 1 6 to 2 4 mm Possible Causes This is caused by gear chatter between various engine and cartridge g
29. r this defect may be evident in a replacement cartridge top Banding K developer hue shift 34mm pitch Figure 11 Banding 34 mm black K Developer hue shift sample 1 LN ANA Defect description Dark horizontal bands typically visible in K halftone colors that are repeating at 34 mm developer roller pitch Possible Causes This is a toner cartridge problem with two causes 1 The developer roller is non concentric and or 2 The developer roller is not perfectly round Troubleshooting and Suggestions Print the PQ Troubleshooting Suite to identify which print cartridge is causing the defect Recommended Parts Replacing the print cartridge may help however this defect may be evident in a replacement cartridge top Background Toner Front side Figure 12 Background toner C_Cartridge C880C11642 Page 19 Engine DC Controller Firmware Time 12 47 40 Input Tray MP T Media 385 LTR 28 HP Soft Glos Defect description Very light hues of color s on non printed areas of the page Contributing Condition Continuous printing stirs toner and degrades the charge properties Also the toner in cartridges that are near end of life have charge properties that are not optimal Possible Causes This is typically a toner cartridge problem caused by positive wrong sign toner being attracted to the media This defect can be found most often on glossy media and at cartridge end of life after printing low coverage Troubleshooti
30. tridge s life Toner has accumulated on the cartridge s doctor blade The purpose of the doctor blade is to create an even level of toner onto the developing roller Since the doctor blade no longer has an even surface uneven amounts of toner are placed on the developing roller then transferred onto the OPC Troubleshooting and Suggestions 1 Print the PQ troubleshooting pages from the printer to verify which cartridge s is showing the vertical lines 2 Print the supplies status page to gauge the percent life remaining for each infected cartridge If any cartridges are reading order supplies below 20 recommend that the customer replace the cartridge Otherwise replace the cartridge under warranty Recommended Parts Replace only the affected print cartridge s top Partial or missing color plane Figure 24 Partial or missing color plane typical of misaligned gears on main drive assembly Figure 25 Partial or missing color plane black Config Page typical of misaligned gears on the main drive assembly 1 TIP ag evotdeooooseotto VIU ees DIA FON ARES 3470529 1995 OA W ITI Wi jaune 11400001 7 ell SIAN 140 499 4 1 ome Mm eu dy Dart 4950 yi a pews mins ipa wiry lai EHAN 0 0 b ort 6 Ae pepr Ty p wt 09 1940038 A5 pa we ao 155 wor OMI SAd EHIE EG Baler pay saso 119103 SA KW 334 IN Jet orang wy minii TIUA MUT MEN meni aa UL v ST A DATO NN gy Om 201391 106IW 61
31. wo reasons for this 1 A foreign particle can become trapped in the cleaning and create an opening for the waste toner to streak onto the page A foreign particle can also cut a notch into the cleaning blade and cause the same result 2 Cold temperatures cause the cleaning blade to be stiffer and cause small openings to occur between the blade and OPC surface Troubleshooting and Suggestions Print the PQ Troubleshooting Suite and look at the vertical streaks on the blank page Replace the defective cartridge Reprint the PQ Troubleshooting Suite to verify the correct cartridge was replaced If the customer has the printer in a cold environment suggest the printer be run in a warmer temperature The defect can come and go as either the temperature is raised or the foreign particle works its way out Recommended Parts Replace the toner cartridge if needed top Marks across page Fuser 110 Volts in 220 Volts Figure 18 Marks across page fuser Defect description Marks appear as short segments that are grouped together as a band This defect occurs only if wrong fuser voltage is being used When using a 110 Volt fuser in a 220 Volt engine Possible Causes Using the wrong fuser voltage impacts the fusing temperature and fuser sleeve bumps develop causing the Marks The defect will be noticed with Glossy media Troubleshooting and Suggestions Check if the customer is using the correct fuser voltage with the correct engi
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