KONICA MINOLTA Confidential 50 Feeding direction Cause 2: Clumps (3) How to specify the cause (a) Chipping cleaning blade Lines at specific position (always the same position) Always happens (does not matter job type, how many prints or so) Mostly Lines Go to solution step 1 and 2 (b) Clumps It occurs especially when continuous printing (after clumps are produced lot). It does not occur at the beginning of print job, after stopping print or after operation of reverse rotation of the transfer belt (because clumps cleaned once). The position is random. It occurs on different positions when switching jobs or after reverse rotation of the transfer belt. It starts thin lines and gradually becomes fat banding Go to the solution step 1, 2 and 3 (4) Solution How to prevent and solve 1. Replace the belt cleaning blade 2. Enable the RFP function When printing with low coverage job continuously, lubricant becomes a lot on the transfer belt and increases risk of forming clumps. The new DU applies especially much lubricant at the beginning. The RFP provides toner to the transfer belt cleaning the lubricant on it, which is a known function to prevent too much lubricant. This DIPSW executes only when installing new DU. RFP can reduce the productivity, and increase toner consumption when low coverage printing. 1. Change the setting of the "control change period setting when the drum unit is replaced". If the cleaning failure occurs after Drum Unit distance% reaches to the 5%, change
KONICA MINOLTA Confidential 51 the DIPSW to the following settings. DIPSW103-2 : 1 DIPSW103-3 : 1 2. Turn the DIPSW for reverse rotation to clean clumps. Execute per 100 printing. DIPSW103-0 : 1 DIPSW103-1 : 1 Frequent reverse rotation to clean clumps can reduce the productivity. Procedure to enable the RFP (toner band creation) 1. Execute Toner Refresh Mode [Administrator Setting]→[System Setting]→[Expert Adjustment]→[Execute Adjust Operation]→[Toner Refresh Mode]→[back to regular display] After returning the regular display, Toner Refresh Mode is automatically executed. Number of times of Toner refresh: Twice If following condition(s) are applicable, conduct less than twice. Coverage (Last 5000 prints) 3% or more, and less than 5% Once 5% or more None Life of Transfer cleaning blade 50% or more Once 2. Replace the cleaning blade When the foreing material from the lubricant attaches to the blade, blade replacement is necessary. 3. Turn the DIPSW for RFP This DIPSW execute only when installing new DU. DIPSW103-6 : 1 Caution If DIPSW104-0/104-1 were changed for FD lines and banding, turn the default as below. DIPSW104-0 : 0 DIPSW104-1 : 0 4. 2nd transfer unit pressure release setting on RFP. When the RFP is enabled, the 2nd transfer roller is in pressed state when the toner is supplied to the intermediate transfer belt. This may cause soilage on the 2nd transfer roller. The soilage on the 2nd tranfer roller may transfer to the 2nd side of the paper and appears on the image. To prevent it, when the RFP is enabled, release the 2nd transfer pressure. DIPSW103-7 : 1 Note Infrequently, Black lines occurs right after replacing to a new blade due to remaining lubricant in the cleaning unit. In that case, Change the Cleaning unit. Table of contents
KONICA MINOLTA Confidential 52 1.2.19. 5mm cycle density difference caused by the fusing unit (1) Symptom On solid image at the later half of the image, 5mm cycle density different area occurs. It is particularly visible on BK solid in LL environment with middle speed printing. The gloss coat paper which is very smooth tends to create the symptom more. (2) Cause The 5mm cycle corresponds with the component of the fusing roller drive engagement; equivalent to 1 tooth engagement. When the fusing unit pulls the paper, the lower press roller speed changes and the image shifts on the 2nd transfer (= difference in density) appears. (3) Solution From the expert setting of the paper setting, access Fusing Speed to adjust and enter the -150. If the density difference is not improved, adjust gradually within the adjustment range (Down to -200). Confirm the print and if the jitter line appears, readjust within the range -150 to 0 and select the optimum value so that both symptom are the least visible. . Change the DipSW1-0 from 0 (Default) to 1 to show expert adjustment. [Service]→[System Setting]→[Software DIPSW Setting] While checking the actual print, enter -150 to the [Fusing Speed (Front)] and [Fusing Speed (Back Side Offset)] Table of contents
KONICA MINOLTA Confidential 53 1.2.20. Color lines in CD at 13mm from the leading edge (1) Symptom Black or color line appears at 13mm from the lead edge (2) Cause When the developer deteriorates due to drastic environment change, the toner image scatters just before the 2nd transfer nipping. Fig 1. Occurrence example (3) Solution (a) Conduct toner refresh mode to eject the developer so that new developer is supplied. [Utility]→[Administrator Setting]→[System Setting]→[Expert Adjustment]→[Execute Adjust Operation]→[Toner Refresh Mode]→Go back to normal screen to start adjustment. Number of times of Toner refresh: Twice If following condition(s) are applicable, conduct less than twice. Note: When the machine has stopped for 3 days or more, conduct twice regardless of the following conditions. (b) Print the solid with the line appearing color to supply new developer. [Service mode]→[Test mode]→[Test Pattern Output Mode] Print No. 53 with 255 until the line is gone. Note Add blank area on leading edge or print in single color. If the 2 or more color included solid, JAM may occur. (c) When the symptom is repeated on the specific machine, set the toner band creation so that the new developer is supplied periodically. [Service]→[System Setting]→[Software DIPSW Setting] Change DipSW to change toner band creation interval. Recommendation value: YMCK 3% Number of times 3% or more, and less than 5% Once 5% or more None Transfer Cleaning blade Life 50% or more Once Coverage (5000 prints) Lead edge to approx. 13mm Feed Direction 13mm from lead edge (lighter at edge) Condition
KONICA MINOLTA Confidential 54 DIPSW Setting 0% 1.5% 3% 5% Toner band creation setting Color(YMCK) DipSW104-0 =0 DipSW104-1 =0 (Default) DipSW104-0 =0 DipSW104-1= 1 DipSW104-0 =1 DipSW104-1= 0 DipSW104-0 =1 DipSW104-1= 1 Note When the intermediate transfer cleaning unit count reaches later part of the life count, cleaning failure may possibly occur. In that case, replace the intermediate transfer cleaning blade. When the developer is deteriorated, the effect of the setting change may not appears. When the band creation setting is enabled, KMI recommends to replace the developer together. Table of contents
KONICA MINOLTA Confidential 55 1.2.21. White line due to separation claw mark (1) Symptom Separation claw slightly damages the intermediate transfer belt and it appears as the white line on the halftone image. (2) Cause When the lead edge of the paper passes the 2nd transfer section the 3 separation claws contacts with the intermediate transfer. When it is repeated, this may cause the scratch on the intermediate transfer belt surface or toner filming of the belt. (3) Solution It is possible to change claw press condition by the DIPSW setting. When the auto (default) is selected, the separation claw is released only for the paper less than 91gsm. Paper weight Pressure 62 to 74gsm ON 75 to 80gsm ON 81 to 91gsm ON 92 to 105gsm OFF 106 to 135gsm OFF 136 to 176gsm OFF 177 to 216gsm OFF 217 to 256gsm OFF 257 to 300gsm OFF Note When the separation claw is always released, the thin paper may wrap the intermediate transfer belt. If jam code is cleared without clearing the paper, paper may enter to the intermediate transfer CL. Table of contents Contents Auto Auto: Claw function for specific paper ON Always pressed: While printing, the claw contacts with the pressure and released. OFF Always release: Claw does not function
KONICA MINOLTA Confidential 56 1.2.22. Gloss band in CD with margin width (1) Symptom Gloss band in CD which corresponds with the margin appears. (2) Cause ・Due to the effect of the wax component transferred from the fusing belt upper, the gloss difference appears by the cycle of fusingg belt upper (311mm). (One kind of gloss memory) (3) Solution 1. Reduce fusing temperature by every 5ºC to check the result. [Paper Setting]→[Change Set]→[Expert Adj.] ･[Upper Fusing Roller Temperature] Note When the Expert Adj. is not indicated, change the DIPSW1-0 (To show expert adjustment in the Paper Setting) from "0" to "1" (Show). 2. If the step 1 does not improve the symptom, change the temperature by every 5ºC within the adjustment range (±20 ºC and search the best setting which the symptom does not occur easily. Note ･When the temperature is decreased too much, fusing under offset may occur. ・When the temperature is increased too much, curl may become larger depending on the paper type or environment. In that case, increase temperature of [Lower Fusing Roller Temperature] or use the curl adjustment of main body/RU. [Paper Setting]→[Change Set.]→[Expert Adj.]→[Lower Fusing Roller Temperature] Main body [Curl Adjustment] RU [Paper Setting]→[Change Set.]→[Expert Adj.] →[Output Curl Adjustment] 311mm The same as margin width 311mm The same as margin width 311mm 1st sheet margin 2nd sheet margin
KONICA MINOLTA Confidential 57 Tips ・Low temperature Regardless of the previous image, the gloss level is entirely low and the gloss memory is not easily seen. ・High temperature The wax amount difference at gloss history is big but entire gloss level is high and the gloss memory is not easily seen. ・Middle temperature Depending on the wax amount difference in the gloss history, the gloss memory is easily find. Table of contents
KONICA MINOLTA Confidential 58 1.2.23. Image lacks at the corner of the trailing edge (Soilage in main scan direction (CD)) (1) Symptom Image lacks at the trailing edge of the paper. At the same time, the soilage to the CD direction the same as the lacking part occurs after one cycle of the intermediate transfer belt. (approx. 862mm). (2) Cause Depending on the paper type (thin paper, fine paper etc), the paper behavior becomes unstable after entering to the fusing unit. If the trailing edge of the paper flips and vibrates slightly and contact with the intermediate transfer belt, the contacting part appears as white part on image. Since the electric charge gathered at the paper edge is added to the toner attaching to the intermediate transfer belt, it sticks on the belt more firmly on the belt and is not cleaned by the intermediate transfer belt cleaner. It is retransferred on the next image then appears as soilage to CD direction. (3) Solution Increase the margin at the trailing edge The symptom tends to occur when the margin (blank area) at the trailing edge is narrow. So enlarge the margin. (a) Move the writing position Set the smaller value for the lead edge trailing edge. [Utility]→[Administrator Setting]→[System Setting]→[Expert Adjustment]→[Printer Adjustment] →[Restart Timing Adjustment] Note Depending on the image, margin at the lead edge becomes too small causing feed problem or image quality problem. (b) Set to erase the trailing edge (the image at the last of the trailing edge is not printed.) 1. Change the DipSW1-0 from 0 (Default) to 1 to show expert adjustment. [Service]→[System Setting]→[Software DIPSW]→DIPSW1-0:1 2. Change the trailing edge erase amount. Machine tab→[Paper Setting]→[Change Set]→[Expert Adj.] →[Rear Edge Erase Quantity]→ Recommendation +50 Table of contents Lack 872.4mm (Intermediate transfer belt cycle: 861.8mm) 80.3m 431.8m 80.3m 280m Soilage
KONICA MINOLTA Confidential 59 1.2.24. CD line on the lead edge (1) Symptom CD line appears at 17mm position from lead edge on coated paper. Under following condition, symptom tends to occur. -Paper type : Coated paper. -Paper weight : Thin paper, for example less than 128gsm -Paper grain direction : Short direction (cross direction) -Paper size : Large size paper, for example more than SRA3 -Image pattern: Solid image -Mode : Duplex mode (2) Cause Lead edge of paper is caught by the fusing exit lower guide because of strong separation air. (3) Solution (a) Adjust fusing separation air 1. Change DipSW1-0 to 1 (Default: 0) to show [[Expert Adjustment] button in the User screen]. 2. Reduce the separation air level. Select [Weak]. Service Mode→[Paper Setting]→[Change Set]→[Expert Adj.] →[Fusing Air Separation Air Level Setting] Paper feed direction CD line Paper path
KONICA MINOLTA Confidential 60 Recommended value is [4] 1. Change DipSW1-0 to 1 (Default: 0) to show [[Expert Adjustment] button in the User screen]. 2. Reduce [Upper Fusing Roller Temperature] on each tray. Service Mode→[Paper Setting]→[Change Set]→[Expert Adj.]→[Upper Fusing Roller Temperature] on each tray. Recommendation is to change by 10 degrees (Max.20 degrees), but please reduce gradually. To check fusing ability, print 20 sets of "internal pattern No.69". Note If temperature setting is too low, "under offset symptom" may occur. Be sure to check fusing ability on the print while temperature adjustment. (c) Change paper grain direction This symptom is reduced by using the paper which paper grain runs parallel to paper feed direction. Table of contents
KONICA MINOLTA Confidential 61 1.3.Others 1.3.1. Image after white part becomes darker (Developing ghost) (1) Symptom When printing solid part and white part mixed image, the density of solid part at immediately after white area looks darker. This also occurs if printing the color not included in solid part. . (The same situation as printing white area.) (2) Cause When printing partly solid image, the toner on the developing sleeve roller is consumed only at the solid corresponding part. Then when printing the next solid part, the toner supply does not catch up for the previous solid part. Consequently, the second solid part is printed slightly lighter. (Blue line indicated area). On the other hand, for the white part, toner amount on the roller is sufficient and printed with correct density. (Red line indicated area). As the result, the density difference is very noticeable. (3) Solution To increase developing ability, perform adjustment. Be sure to check actual print at every step. Note Adjustment may cause background or carrier attachment. Please adjust carefully. 1. Decrease the set value of Covered margin fine Adj. Service mode→[Process adjustment]→[Process fine adjustment] →[Covered margin fine adj] After setting, perform auto gamma adjustment. 2. Increase the set value Develop AC Bias Fine Adj. Feed direction Feed direction
KONICA MINOLTA Confidential 62 Service mode => [02 Process adjustment] => [04 Process fine adjustment] →[02 Develop AC Bias Fine Adj.] After setting, perform auto gamma adjustment. 3. Decrease the set value of Develop AC frequency Service mode→ [Process adjustment]→[Process fine adjustment] →[Develop AC frequency] After setting, perform auto gamma adjustment. 4. Increase the set value of Toner density fine adjustment Service mode →[Process adjustment]→[Process fine adjustment] →[Toner density fine adjustment] Table of contents
KONICA MINOLTA Confidential 63 1.3.2. Darker at the trailing edge of image (1) Symptom The image density increases at the trailing edge of the paper to the paper feeding direction (2) Cause Developing sleeve rotation direction and drum ration direction is opposite. (3) Solution 1. Change the screen. If Line1 or Dot1 is used, change to Line2 or Dot2. Still the image density difference is noticeable change the Custom screen setting: Utility menu→[Machine Admin. Setting] →[System Setting] →[Expert Adjustment ] → [Quality Adjustment]→[Custom screen]. Change [Line2]:[Type1] to [Type2], [Dot2]:[Type1] to [Type2]. 2. Change the Developing AC frequency If customer does not want to change screen, change the Developing AC frequency from Service mode. Service mode→[Process Adjustment]→[Process Fine Adjustment]→[Develop AC Frequency Fine Adjustment] Note However, when changing this setting, the background or rough image may occur. Table of contents Feed direction
KONICA MINOLTA Confidential 64 1.3.3. Background or toner scattering after continuous low coverage (1) Symptom Continuously printing high coverage (50% or more) after continuously printing low coverage (less than 3% and 10,000 prints or more), toner may scatter from the developing unit or background may occur. (2) Cause Though new developer is supplied, too much low charged developer remains inside the developing unit. (3) Solution To consume low charged developer, change the setting to constantly consume the developer by creating toner band. (Toner band is not created by factory setting) Recommendation value: 3% [Service mode]→[System Setting]→[Software DipSW setting] Change Dip-SW setting and create the toner band. DipSW 0% 1.5% 3% 5% Toner band creation setting Color(YMCK) DipSW104-0 =0 DipSW104-1 =0 (Default) DipSW104-0 =0 DipSW104-1 =1 DipSW104-0= 1 DipSW104-1= 0 DipSW104-0 =1 DipSW104-1 =1 Note • When the band creation control is enabled while the intermediate transfer cleaning unit reaches over the half of the limit count, cleaning failure may occur. In that case, replace the blade of the intermediate transfer cleaning unit. • When the developer is deteriorated, the effect of the setting change may not appears. When the band creation setting is enabled, KMI recommends to replace the developer together. Table of contents
KONICA MINOLTA Confidential 65 1.3.4. How to maintain consistent color during continuous printing (1) Symptom Inconsistent color (2) Solution C1070 series have 3 correction items to adjust the color. Aim the stable color optimum for the target depending on the job size and machine usage by combining correction items and interval. 1. Priority on stability To enhance stability in density during continuous print, select Stability. When the Stability is selected, the distance between papers is enlarged at certain interval then the patch is created for the density control. • [Utility]→[Administrator Setting]→[System Setting]→[Expert Adjustment]→[Quality Adjustment] → [Stabilization Adj. Setting] • [Machine]→[Adjustment]→[Stabilization Adj. Setting] From either of the above screen, change the setting from [Speed] to [Stability]
KONICA MINOLTA Confidential 66 • Merit and demerit at selecting, “Stability” Merit Stable density during JOB Demerit Productivity decrease (95% for A4 size) If the density difference between images is too large, stabilization operation of about 30 sec, may be inserted in the middle of a job. 2. Automatic gamma adjustment Adjustment cycle : 1000 prints Adjustment duration: 80 to 120 seconds Note Even the adjustment cycle 1000 prints comes, the adjustment is performed only after 1minute interval between jobs. 3. Customize correction operation (change interval) Color calibration during a job Changing interval of the calibration operation will effective to balance between stability and speed depending on the job size and machine use state. The setting is selectable when the “Stability“ was selected. How to set [Utility]→[Administrator Setting]→[System Setting]→[Expert Adjustment]→[Quality Adjustment]→[Stabilization Adj] Correction performing interval is roughly the following prints. Operation duration: Approx 1 sec (conduct during job) Max density correction Frequency -2 -1 Normal 1 2 200 prints 100 prints 50 prints 30 prints 10 prints Table of contents
KONICA MINOLTA Confidential 67 1.3.5. Unexpected density drop if "Dens. Adj. Per Paper" set positive (+) value (1) Symptom If printing continuously in high coverage image with setting "Dens. Adj. Per Paper" to positive (+) value, there are potential of unexpected density drop as following. Around 10 prints from start, print image density starts decreasing to the extent it is not visible. Then the density drop is going to be visible gradually if the same job is continued on same condition. (The level and number of print to be visible depends on its setting and coverage) [Paper Setting]→[Expert Adj.]→[Dens.Adj. Per Tray(YMC)]/[Dens. Adj. Per Tray(K)] NOTE: When the paper setting was recalled by [Evenness+2]/[Evenness+3]/[Evenness+4] button from [Preset], both [Dens. Adj. Per Paper] were set to positive (+) together. Button name and advanced setting Button Name Fusing roller(Up) Temperature Den. Adj. per Tray (YMC, K) Evenness + 1 No increase in temp. when print start. def. value Evenness + 2 def. value (±0) +1 Evenness+ 3 def. value (±0) +2 Evenness+ 4 def. value (±0) +3 (2) Cause Setting [Dens. Adj. Per Paper] for positive (+) value makes toner consumption increase than standard setting because toner amount on paper increases. If high coverage image was printed on this setting, the toner density in the developing unit might decrease. Then printing image density drop appeared finally. The following table shows potential risk area in yellow about affecting [Dens. Adj. Per Paper] and color coverage on image. Coverage on image (%) Dens. Adj. Per Paper (Step) 0 +1 +2 +3 60 OK OK OK OK 70 OK OK OK Potential 80 OK OK Potential Potential 90 OK Potential Potential Potential OK: Having no potential for the problem, Potential: Having potential for the problem (3) Solution 1. Print No.55 chart (Recommended: 5%) by 100 pages,. (After this printing, perform [Gamma Automatic Adj.].) If customer do not accept 100 pages prints, perform [Auto Gamma Adjustment] 3 or 5 times.
KONICA MINOLTA Confidential 68 2. Print No.43 chart to confirm the result whether the image density recovers or not. If the result is good, go to step 5 to prevent recurrence of the problem. 3. If the print image density does not recover after step 2, perform [Toner Density Revert]. [Service]→[Process Adjustment]→[Drum Peculiarity Adj.]→[Toner Density Revert] NOTE: Do not perform [Toner Density Revert] except the case visible image density drop is occurring, because the solution has potential side effect like toner scattering, background and so on after performing it. 4. Confirm [Max Density Adustment]/[Max Density Initial Adjustment]. If these are intentionaly set higher than our spec, explain this risk to the customer and adjust the density into optimum range. Maximum Density Adjustment: [Adjustment]→[Quality Adjustment]→[Maximum Density Adjustment] [Utility]→[Administrator Setting]→[System Setting]→[Expert Adjustment]→[Process Adjustment]→[Maximum Density Adjustment] Max Density Initial Adj.: [Service]→[Process Adjustment]→[Drum Peculiarity Adj.]→[Max Density Initial Adj.] 5. If customer usually print more than 70% coverage images with using [Dens. Adj. Per Paper], the recurrence potential is higher than standard. Divided toner supply control has been applied to prevent screw mark problem. But if the control is disabled, toner continuously supply to developping unit to keep the toner density in the developing unit. DIPSW104-7: Divides the supply frequency of the toner and delays its speed. =0: Enabled (Default) =1: Disabled NOTE: Do not apply the solution except such high risk customer because disabling of this setting has higher risk of screw mark caused from rapidly increasing toner density in the developing unit after printing low coverage images. And also set "Toner band creation setting" to 3% or 5% to reduce screw mark risk. (Turn on "2nd transfer unit pressure release setting" at same time.) DIPSW Setting 0% 1.5% 3% 5% Toner band creation setting Color (YMCK) DipSW104-0= 0 DipSW104-1= 0 (Default) DipSW104-0 = 0 DipSW104-1 = 1 DipSW104-0 = 1 DipSW104-1 = 0 (recommend) DipSW104-0 = 1 DipSW104-1 = 1 (recommend) Toner band creation setting 0% 1.5% 3% 5% 2nd transfer unit pressure release setting DipSW103-7 = 0 (Default) DipSW103-7 = 1 (recommend) DipSW103-7 = 1 (recommend) DipSW103-7 = 1 (recommend) Table of contents
KONICA MINOLTA Confidential 69 1.3.6. Small blank area or color registration error (1) Symptom Small blank area appears or color registration error is visible at the text or fine line part (2) Cause When using heavy paper (256g or more) or thick paper, the intermediate transfer belt rotation speed is changed when the paper passes the 2nd transfer unit. It causes the color registration error at the first transfer where the toner on the photoconductor drum is transferred to the intermediate transfer belt. The color registration error appearing 1st position depends on the distance between 2nd transfer roller and drum for each color. (See figure 1) From 495 mm of the 1st sheet and from the 2nd sheet, the color registration error of each color overlaps and appears for all colors. Fig.1: Color registration error appearing position for A3 (297x420ｍｍ) (3) Solution It will be improved by the following: To reduce the intermediate transfer belt speed change, increase the line speed by following 1. From COPY or MACHINE screen, select [Paper Setting]. Select arbitrary tray. Then select [Change]. At the [Weight], select the lighter weight than actually used paper. (As the rough indication, 1/1 speed for 105gsm or less, 2/3 speed for 106 to 209 gsm) However, if the above setting change is performed, fusing time is reduced and fusing failure may occur. So, the setting should be used carefully. 2. If the fusing failure occurs after trying the above (1), change the fusing temperature by following procedure: From COPY or MACHINE screen, select [Paper Setting]. Select arbitrary tray. Then select [Change]. Select [Expert Adj.] then press [Next] button. For the [Upper Roller Temperature (Print)] and [Lower Roller Temperature (Print)], enter larger value. However, if the fusing roller temperature is changed, paper turns wavy or blister on the coated paper may occur. Additionally, depending on the paper, the registration error cannot be solved completely. If the improvement level is not enough, please request customer to try another paper type. Table of contents 115m 1 95m 95m 95m Yellow Magent Cyan Black 2 3 4 Feed direction Leading edge 115m 95m 95m 95m 20m Normal: No registration error Abnormal: Cyan color registration error 1 2 3 4 115m 1 95m 95m 95m Yellow Magent Cyan Black 2 3 4 Feed direction Leading edge 115m 95m 95m 95m 20m 1 2 3 4
KONICA MINOLTA Confidential 70 1.3.7. Too high gloss (1) Symptom Gloss is too high. (2) Cause Fusing temperature setting is higher for the paper. (3) Solution 1. Show Expert adjustment in Paper Setting. Change DipSW 1-0 from 0 (Default) to 1. 2. To improve too high gloss, reduction of the Upper fusing temperature is effective. Use the preset button (It appears after setting the DipSW 1-0 to 1) [Paper setting]→[Preset]→[Lower]
KONICA MINOLTA Confidential 71 Caution When [Up fusing Initial Temp.] is changed, "fusing failure" (Toner is peeled off because fusing temperature is not enough) may occur. 3. Decrease Upper Fusing Roller Temperature for respective trays. [Machine]→ [Paper Setting]→ [Change Set]→ [Expert Adj.]→[Upper Fusing Roller Temperature] As the first step, change temperature by 10 °C then gradually decrease (Max 20 °C) To avoid fusing under, print the test pattern 20 sheets of No. 69 and check image. 5. If the effect is not enough, replace the fusing belt (A57V720200) to that for the envelope fusing unit. Table of contents
KONICA MINOLTA Confidential 72 1.3.8. Rough image on the 1st side of duplex (1) Symptom The image on the 1st side of duplex print gets rough and not glossy, (2) Cause (a) When Mix mode or changing a tray, Temperature of lower roller surface is too high. (b) Temperature of lower roller surface is too high shortly after print starting. (3) Solution (a) When Mix mode or changing a tray, Temperature of lower roller surface is too high. Change fusing stability setting in Administrator setting. [Administrator Setting]→[Common Setting]→[Fusing Stability] Change setting to [Better Quality] or [Best Quality] Note When changing the setting from Speed (default), to [Better Quality] or [Best Quality], productivity may decrease. It is noticeable when paper type is switched. (b) Temperature of lower roller surface is too high shortly after print starting. 1. Change DipSW1-0 from 0 (Default) to 1 to show expert adjustment on paper settings. [Machine]→[Paper Setting]→[Change Set.]→[Expert Adjustment] 2. Decrease fusing roller lower temperature for respective tray. Change by 5°C. Maximum adjustment range is 15 °C. Be careful for the fusing under offset. To check, print 20 sheets of test pattern 69. 3. When the effect is not enough, decrease upper fusing roller temperature. Change by 5°C. Maximum adjustment range is 15 °C same as lower roller. Be careful for the fusing under offset. To check, print 20 sheets of test pattern 69. Table of contents
KONICA MINOLTA Confidential 73 1.3.9. White or color banding at thick paper leading and trailing edges (1) Symptom On thick paper, white or color banding appears at 5 to 10mm from leading edge and 20mm from trailing edge. (2) Cause • White band: Void due to abnormal discharge When very stiff paper is fed, the paper pushes up the intermediate transfer belt when the leading edge or trailing edge of the paper enters to the 2nd transfer nip. The belt and paper does not contact at that point causing abnormal discharge. The toner reversely charged is not transferred to the paper and looks like void (white spot). • Color lines: Shock generated when the trailing edge exit the 2nd transfer front guide and blur due to abnormal discharge. When very stiff paper exits the 2nd transfer front guide, the paper hits the belt strongly and generates shock. The shock makes the image on the belt blurred. (3) Solution (a) Change 2nd transfer pressure 1. Change DipSW1-0 from 0 (Default) to 1, to show expert adjustment on paper settings. 2. [Machine]→[Paper Setting]→[Change Set.]→[Expert Adj.] [2nd Trans. Pressure] Select [Normal] When [Normal] is selected, color line in main scan direction (CD) may appear at 105mm from leading edge. If it is noticeable, set the setting to auto and go to step 2 in below. If the improvement level is not enough, without reset the setting, go to the step 2, 2nd transfer output adjustment. (b) 2nd transfer output adjustment 1. To show expert ad DipSW1-0 from 0 (Default) to 1. 2. Adjust 2nd transfer current at the banding occurring part. [Machine]→[Paper Setting]→ [Change Set.] → [Expert Adj.]: [2nd transfer-Lead Edge (Front)], [2nd transfer-Lead Edge (Back)], 2nd transfer-Rear Edge (Front)] or [2nd transfer-Lead Edge (Back)] If output is reduced too much, poor 2nd transfer occurs. Please adjust while checking actual print image. (c) Change paper face (turn around the paper in the tray) 10mm from leading edge 20mm from trailing edge Feed direction
KONICA MINOLTA Confidential 74 (d) Change paper grain direction The symptom is improved when the paper grain is vertical to the feed direction. (For example, long grain for A3 paper.) (e) Leading edge and trailing edge erase 3. Change DipSW1-0 from 0 (Default) to 1, to show expert adjustment on paper settings. 4. Adjust the leading edge and trailing edge erase amount. [Machine] → [Paper Setting] → [Change Set.] → [Expert Adj.] Lead edge erase quantity and Rear edge erase quantity. Note Carefully set the erase area because the image in the erased area is not printed. Table of contents
KONICA MINOLTA Confidential 75 1.3.10. C-2451, C-2452, C-2453 or C-2454, Low toner density (1) Symptom Just after developing unit replacement, C-2451, C-2452, C-2453 or C-2454 (toner density abnormal) occurs. (2) Cause The orange tape is still attached to toner supply inlet of the respective unit. (3) Solution (a) Turn OFF the sub-switch then the main-switch of machine. (b) Open the front door and remove the internal cover. Gently pull out the process mount. Be careful not to spill the toner. (c) Remove the developing unit from the process mount and remove the orange tape. (d) Clean inside the machine when it gets soiled. (e) Reinstall the developing unit to the process mount. (f) Push back the process mount then fix the internal cover with the screw. Close the front door. (g) From the service mode, conduct [Toner Density Revert] for the applicable color for 4 to 5 times. Select the applicable color then press [Start]. Repeat 4 to 5 times. [Service]→[Process Adjustment]→[Drum Peculiarity Adj.]→[Toner Density Revert] (h) Conduct [Gamma Automatic Adjustment] [Service]→[Process Adjustment]→[Drum Peculiarity Adj.]→[Gamma Automatic Adjustment] (i) Measure the density and confirm that no problem occurs. Table of contents Orange tape
KONICA MINOLTA Confidential 76 1.3.11. Poor transfer at image front (1) Symptom When the periodic cleaning of the 2nd transfer unit is not enough, poor transfer may occur at the entire area of the machine front side image. (2) Cause The dust from 2nd transfer roller shaft due to wearing, builds up on the 2nd transfer pressing part and the pressed status becomes improper. (3) Solution Clean the pressure sliding part (4 position) and surrounding area (See the figure in below) with the alcohol and the hydro wipe. If the symptom does not improve, replace the pressing cover (A50U5209) at machine front side with new one. Front side image gets lighter; color is fainted. Paper feed direction
KONICA MINOLTA Confidential 77 Table of contents 前 後 押圧摺動 摺動部周 A50U5209 押圧蓋 Front Rear A50U5209 Pressing cover Pressure sliding part Surrunding area
KONICA MINOLTA Confidential 78 1.3.12. Prevention of the backside soilage (1) Symptom The backside of the paper gets soiled (includes 75mm cycle, the 1st one is at less than 75mm) (2) Cause The patch created between images in image stability priority mode attaches to the 2nd transfer roller. Though the 2nd transfer roller's cleaning operation which is to return the toner to the intermediate transfer belt using the static electricity is inserted, depending on the environment (especially at low humidity environment), and the 2nd transfer roller consuming state and paper type (additive of paper), cleaning performance is not enough. (3) Solution Change DipSW105-0 and increase frequency of the cleaning [Service] → [System Setting] → [Software DIPSW Setting] DipSW105-0=0 (Default) = 1 x 1.5 When the usual CL frequency is 4 times, it is changed to 6 times. = 2 x 2 When the usual CL frequency is 4 times it is changed to 8 times. Note When the cleaning frequency is increased, the productivity decreases by 1% to 2 %. Therefore, change the setting and see the customer's acceptance. Table of contents
KONICA MINOLTA Confidential 79 1.3.13. Fainted outline, darker at edge (1) Symptom On halftone image, the outline of the paper leading edge side gets fainted (fainted outline) and the trailing edge side outline gets darker. (2) Cause The symptom which occurs due to the reverse rotation direction between developing roller and drum rotation direction is in counter. (3) Solution Adjust the outline process. [User Setting] → [Printer Setting] → [Outline Process] 1. FD Lead Edge Density Adjustment Adjust to + direction. When the value is changed from 0 (default) to larger, the outline at lead edge is written darker. It is effective to prevent fainting at the leading edge. The more the larger value is selected, the darker the line becomes. 2. FD Rear Edge Density Adjustment Adjust to – direction. When the value is changed from 0 (default) to lower value, the outline at the trailing edge is written lighter. Darker edge of the text is improved. Note Check the image at the adjustment to check the effect. It is effective for the print image. Copy image is out of adjustment target. It is effective not only for the text but also for the graphic. However, when the problem area is l like trailing edge of the patch, this adjustment is not effective enough. Table of contents
KONICA MINOLTA Confidential 80 1.3.14. Image background under high temperature (1) Symptom During continuous print on coated paper under high temperature environment, image background occurs. The symptom particularly occurs when the temperature is 25 ºC and over, Bk mode/High coverage (25% and over) (2) Cause When the printing is continued under high temperature, the grain of the lubricant on the photo conductor drum becomes larger (invisible for human eyes) The potential is low at the lubricant grain part and the toner is developed there. The number of lubricant grains becomes larger in Bk mode > Color mode, High coverage > Low coverage. When the lubricant grain increases, the image background becomes visible on coated paper. (3) Solution (a) Change the value of the Background Margin Fine Adjustment. [Service]→[Process Adjustment]→[Process Fine Adjustment]→[Background Margin Fine Adj.] Increase setting from 0 to +5 Note After changing the setting, conduct Gamma Automatic Adjustment. By changing the setting, please note that carrier attachment may occur. (b) Change the setting for the Develop AC Bias Fine Adj.] Develop AC bias [Service Mode]→[Process Adjustment]→[Process Fine Adjustment]→[Develop AC Bias Fine Adj.] Change the setting from 0 →-5. Develop AC Frequency [Service Mode]→[Process Adjustment]→[Process Fine Adjustment]] Increase from 0 to +5 Note After changing the setting, conduct the Gamma Automatic Adjustment. When changing the setting, the unevenness in density in developing cycle may occur. In that case, change the "Develop AC Bias Fine Adjustment" value slightly back for the adjustment. (c) When the image background appears at black and white mode, use the "Thick Bk mode". [Paper Setting]→[Change Set]→[Expert Adjustment]→[Thick Bk mode] Change from OFF to ON. Note "Thick Bk mode” is the setting to print Bk in color mode. When this setting is enabled, even for the single Bk print, charging corona, drum, developing unit, developer, 1st transfer roller for Y, M and C consumes. Since toner scattering possibly occur, we recommend to use the "Thick Bk mode" only when it is necessary. When “Toner band creation (DipSW)" is enabled, image background and scattering toner can be reduced to some extent. (For the rough indication, toner band creation by 3% is recommended if the 3000 pages and over is printed using Thick Bk mode.) However, since all the color toner is spent, the non-used color is consumed, too. Also, once in 100 prints, distance between sheets is enlarged and productivity reduces to 90% or less. Table of contents
KONICA MINOLTA Confidential 81 1.3.15. Backside image soilage (1) Symptom At duplex print, the 2nd side may get soiled at machine front and rear. (2) Cause When the oil from sintered shaft bearing and paper dust or other dust is mixed, it may drop on the bottom plate and attach to the paper when the paper goes through the bottom plate during the switch back. Dust drops
KONICA MINOLTA Confidential 82 ] (3) Solution Clean the above points and ADU. Table of contents Dusts Bottom plates
KONICA MINOLTA Confidential 83 1.3.16. Toner is not cleaned at the edge of the transfer belt (1) Symptom During machine setup, the toner cleaning failure occurs at the edge of the intermediate transfer belt. (2) Cause As shown in the figure below, the blade gets over the cushion material and the edge of the blade flips. (3) Solution 1. Repeat, release => press => release => press repeatedly. Toner pass through the edge of the blade Cushion material Blade Flipping Press
KONICA MINOLTA Confidential 84 2. Press the cushion material to prevent interference. → Press the cushion material to the arrowed direction to change form. Note Be careful not to remove the cushion material. Table of contents Release Space is created between belt and blade
KONICA MINOLTA Confidential 85 1.3.17. Transferability on embossed paper (1) Symptom In using embossed paper (bumpy paper), toner density of concave parts gets thin because toner amount is not enough on concave parts. Major embossed paper Japan Leathac (Tokushu Tokai Paper) / Classic Linen (nina) US Linen Papers (Neenah Paper) via Linen Bright White i-TONE(Mohawk) /superfine White i-TONE Eggshell(Mohawk) EU Invercote G Linen(IGEPA) / Elfenbein Linen(IGEPA) / Ever Aomori(Gmund) Note If it is difficult to identify paper type, confirm [1.3.18. Image density is lighter on unsmooth paper (rough paper)]. (2) Cause ・Lack of electric field at concave parts Electric current of 2nd transfer is likely to flow to concave parts, and transfer becomes poor. ・Extra electric field at concave parts Transfer failure at concave parts occurs as discharge occurs through void part. ・Lack of fusing ability at concave parts Fusing ability becomes insufficient because of pressure and heat quantity for toner at concave parts. (3) Solution Following table shows the items which is effective to improve emboss transferability with its effect level and the side effect. Item Effect Side effect Recommend a. Toner band creation setting High Increase toner consumption Decrease productivity Recommend b. High resistance transfer belt High Line like ripple on secondary color solid image (like Red/Green) Factory set for some destination. c. Embossed paper profiles Middle None Dens. Adj. per Tray Middle Increase toner consumption Inclusive profile 2nd transfer output setting Middle None d. Embossed paper setting High Recommend Expect high effect. M toner C toner Transfer belt Paper surface
KONICA MINOLTA Confidential 86 Factory set for some destination. Recommend Based on [4] or [5] e. Toner refresh mode Low (Just temporary) Increase toner consumption Temporary solution 1. <CE settings> Display Textured paper type button on screen. (When it is already displayed, go to next step) DipSW 105-6=1 (ON) 2. At first, adjust the machine to be the best condition for embossed paper. Execute toner band creation function (YMCK3%). When printing low coverage (less than YMCK3%) job continuously, transfer ability for embossed paper becomes poorer as the toner inside the developing unit gets deteriorated. When theYMCK3% or more coverage job is printed, the transfer ability become stable. By using toner band creation function, the toner is regularly ejected from the developing unit, and fresh toner is supplied. When the less than YMCK3% coverage is printed continuously, printing temporary stops and toner band is created on the intermediate transfer belt to keep minimum coverage becomes YMCK3%. DipSW for Embossed paper 0% 1.5% 3% 3%/5% switching Toner band creation setting Color(YMCK) DipSW 102-6= 0 DipSW102-7=0 (Default) DipSW102-6=1 DipSW102-7=0 DipSW102-6=0 DipSW102-7=1 DipSW102-6=1 DipSW102-7=1 Note Recommend setting is 3% and 5% switching setting of usually 3%, embossed 5%. If it is selected 5% control is applied only selecting [Textured] paper type. Regarding the band creation setting of C3080 series, default setting of 2nd transfer is released state. Side effect Toner band creation setting reduces the productivity (Reduce by max 10% for A4 conversion) when the coverage is YMCK3% and increases toner consumption at low coverage printing. When the intermediate transfer CL blade count reaches more than half, the cleaning failure may occur. Note When the low coverage job was printed just before enabling the toner band creation, the effect does not appear immediately because all the deteriorated toner is not ejected at once. Therefore, print 1000 prints of 20% coverage original for all colors (Y/M/C/K). It may increase toner consumption and background. 3. <Customer workflow> Conduct before printing embossed paper. Execute toner refresh mode 2 times. Replace toner in the developing unit by performing the toner refresh mode. [Utility/Counter]→[Administrator Setting]→[System Setting]→[Expert Adjustment]→ [Execute Adjust Operation ]→[Toner Refresh Mode]→[Cancel]→[Exit[UTILITY]] 4. Set [Textured] paper type to the tray used in [Paper Setting].
KONICA MINOLTA Confidential 87 Select from [Light/ Deep/ 1-Sided Textured/ 2-Sided Textured] [Guide for selecting embossed paper] Light Classic Linen 216gsm, NT stripe 198gsm, NT Hosoori 198gsm, Tant Select 151gsm, Jacquard GA 198gsm Deep Leathac 66 151gsm, 203gsm, 302gsm 1-Sided Textured Embossed paper of only 1-side textured and another-side smooth.(ex.Leathac) When you use it, set textured side to be 1st side.(Regarding PFU, set textured to upper side. Regarding Main body tray, set textured to bottom side.) 2-Sided Textured Embossed paper of both side textured.(ex. EverAomori) Note If you have fusing under in Deep-structured paper, increase Upper fusing roller temp and select heavier paper type. For further fine tuning, change setting for the following items. Be sure to check the effect on the actual print. 2nd Transfer Output Adj. (Front) plus minus 10 to 20 (Not change too much value in one time) 2nd Transfer Output Adj. (Back) Density Per Tray (YMC) (K) Note Shock Noise may occur on Thick Embossed paper. To reduce it, set [Normal] or [Low] in [2nd Trans. Presure]. [Auto (High)] is the default setting for Textured setting. To reduce glossiness, decrease [Fusing temperature] confirming actual image. 5. Register to Paper Profile for ease of next adjustment. Select [Register & OK]
KONICA MINOLTA Confidential 88 [New Store]→Input a name and [OK] 6. When further improvement is needed, confirm installed Transfer belt type. When connector is not connected at front of Transfer unit: Normal transfer belt When connector is connected at front of Transfer unit: Transfer belt for Embossed paper When Normal transfer belt is installed, replace to Transfer belt for Embossed paper (High resistance transfer belt / A50U5105) At the same time prepare a transfer detection harness/1 and a replacement label/5, connect the harness/1 at the front of the transfer unit. After connecting the harness/1, control is automatically changed for the emboss paper. Identification of transfer belt Normal transfer belt for C3080 (Lot No.is RED)
KONICA MINOLTA Confidential 89 For embossed paper transfer belt (Lot No. is BLUE) Note When replace to the high resistance transfer belt, the line like ripple line may occur. If it occurs, adjust [Front & Back Density] and [Maximum Density Adjustment] refer to Troubleshooting guide [Line like ripple line on print]. Line like ripple Note For embossed paper transfer belt installed customer, if [Ripple line] is concern, customer can select to replace transfer belt unit so that embossed transfer belt is used for the embossed paper only. Refer details for the user guide for how to replace transfer unit. 7. When [Emboss transfer] of yellow mark need display, Set the DipSW. DipSW 93-0=0 (Display) Display for Embossed After replacement to transfer belt, repeat from 5 to 7 and confirm effect again. 8. Change Screen referring from (1) to (5). (a) IC-605 Select [Custom Screen] of [Imaging]Tab in Printer driver setting.
KONICA MINOLTA Confidential 90 (b) IC-313/IC-417 Select [Halftone Simulation] of [Color setup] tab in Printer drive setting. On IC-313,This Function is provided for a charge. On IC-417, This Function is not support. (c) IC-313/IC-417 Not support. Try and find the best setting for the better transfer image from following 5 setting (Dot shape, Screen lines and Screen angle). The optimum screen is difference by the Paper type or the Image pattern. Setting 1 Line 71 lines Cyan Magenta Yellow Black Dot shape Line Line Line Line Lines 71 71 86 71 Angle 105 15 165 45
KONICA MINOLTA Confidential 91 Setting 2 Line 100 lines Cyan Magenta Yellow Black Dot Shape Line Line Line Line Lines 100 100 133 100 Angle 82.5 172.5 157.5 22.5 Setting 3 Dot 75 lines Cyan Magenta Yellow Black Dot Shape Dot Dot Dot Dot Lines 75 75 75 100 Angle 30 60 0 45 Setting 4 Dot 90 lines Cyan Magenta Yellow Black Dot Shape Dot Dot Dot Dot Lines 92 92 100 133 Angle 30 60 0 45 Setting 5 Dot 110 lines Cyan Magenta Yellow Black Dot Shape Dot Dot Dot Dot Lines 109 109 120 133 Angle 30 60 0 45 Note Dot and line on half tone become noticeable when number of Screen Line is set smaller. When Custom screen is set, half tone color is differed slightly. （Because custom screen is not in the stabilization pattern, Gamma Adjustment does not achieve expected density.） It is recommended to prepare the gradation pattern of each Y,M,C,K,R,G and B to see image quality level such as moire during checking each setting. Table of contents Confirm halftone image
KONICA MINOLTA Confidential 92 1.3.18. Image density is lighter on uncoated paper (unsmooth paper) (1) Symptom Image density gets lighter on uncoated paper. Symptom tends to occur especially when the paper surface is rough. Some of uncoated paper is categorized as unsmooth paper and some are categorized as embossed paper. The solution depends on the paper type but it is difficult to identify by just looking the printed image. At first trying some changes of key parameters for the rough paper solution. Next, perform for the emboss paper solution may be the quickest way to solve the issue Major unsmooth paper (surface rough paper) US Spring Hill Digital /Finch Color Copy EU Fastprint /HVO Note When the solution for the unsmooth paper is not effective, the used paper is categorized as embossed paper. Reset to default setting from "Up Fusing Initial Temp." "Upper fusing temperature" and "Paper setting" of the unsmooth paper setting. (2) Cause High gloss toner gets absorbed on unsmooth paper then image density looks lighter. Fig. Low Density sample for example
KONICA MINOLTA Confidential 93 (3) Solution Against the lighter density, it is effective to "Reduce fusing temperature" or "To increase toner attaching amount". It can be easily set using the pre-set button newly available from FW ver.20 (Set DipSW 1-0→1). Change DipSW1-0 from 0 (Default) to 1, to show process adjustment on paper settings. [Paper Setting]→[Preset]→[Unsmooth Paper Density Setting] Select +1 to +4 →[OK] Button name and advanced setting Unsmooth Paper Density Setting Button Name Fusing roller(Up) Temperature Den. Adj. per Tray (YMC, K) Evenness + 1 No increase in temp. when print start. def. value Evenness + 2 def. value (±0) +1 Evenness+ 3 def. value (±0) +2 Evenness+ 4 def. value (±0) +3 The same result will be achieved by changing the [Upper Fusing Roller Temperature] and the [Den. Adj. per Tray] setting individually. ・Uncoated paper Low gloss toner (C6501) ・Uncoated paper High gloss toner (C1070/C2070) Non-melting toner is not absorbed to paper's fiber and some are crushed leaving its shape. Light makes regular reflection on toner's surface and changes its angle on paper's rough surface, which appears as unevenness. Uncoated Melting toner is not absorbed to paper's fiber and white background does not remain. This is a small scattering reflection and appears even as a whole. Before melting Coated After melting ・Coated paper High gloss toner (C1070/C2070) Uncoated Melting toner is absorbed to paper's fiber and white background remains.
KONICA MINOLTA Confidential 94 Note Fusing failure and line like ripple may occur. If the "Den. Adj. per Tray" set "+1" or more, Color is changed. But the effect is high for increasing density.
KONICA MINOLTA Confidential 95 When the button of "Evenness +1" is selected, fusing failure (such as poor fusing or toner is peeled off because fusing temperature is not enough) may occur. When the rough paper solution is not effective, the used paper is categorized as embossed paper. Reset to default setting. Then go to "Transferability on embossed paper". Default fusing temperature is different according to the paper type selected by the paper setting. Therefore, when changing the fusing temperature, mind the paper type selected. When necessary, execute color calibration. Table of contents
KONICA MINOLTA Confidential 96 1.3.19. Gloss memory (1) Symptom The gloss is partly different. It corresponds with the image pattern. (Gloss is higher where the toner was at the previous cycle). (2) Cause Due to the effect of the wax component which was transferred to the fusing upper belt, the difference of the gloss corresponding to the image appears at fusing upper belt cycle (approx 311mm ) (Gloss memory). (3) Solution 1. Change fusing temperature by every 5ºC and see the result. [Paper Setting]→[Change Set]→[Expert Adj.]→ • [Upper Fusing Roller Temperature] Note When the expert adjustment is not indicated, change the DIPSW1-0 (To show expert adjustment in the Paper Setting) from "0" to "1" (Show) 2. If the step 1 does not improve enough, change the temperature by5 ºC within the range ±20 ºC to seek the temperature symptom is the least visible. Note • When the temperature is decreased too much, fusing under offset may occur. • When the temperature is increased too much, large paper curl may occur depending on the paper type and ambient environment. In this case, increase [Lower Fusing Roller Temperature] or use the curl correction of the main body/RU. [Paper Setting]→[Change Set]→[Expert Adj.]→[Lower Fusing Roller Temperature] Main body [Paper Setting]→[Change Set]→[Process Adj]→[Curl Adjustment] RU [Curl Adjustment] Tips • Low temperature Regardless of the previous image, the gloss level is entirely low and the gloss memory is not easily see. • High temperature The wax amount difference at gloss history is big but entire gloss level is high and the gloss memory is not easily seen. • Middle temperature Depending on the wax amount difference in the gloss history, the gloss memory is easily find. Table of contents ABCDEFGHIJKL ABCDEFGHIJKL ABCDEFGHIJ ABCDEFGHIJ ABCDEFGHIJKL ABCDEFGHIJKL ABCDEFGHIJKL ABCDEFGHIJKL 311mm cycle Repeated gloss mark (text/image) Wax component attaches to the fusing upper belt.
KONICA MINOLTA Confidential 97 1.3.20. Center of line gets broken (1) Symptom When the very smooth surface paper is used, the thin line gets broken at the middle. It tends to occur especially on OHP sheet. (2) Cause The toner image aggregates at the 2nd transfer unit and only the edge part is transferred well and the center part is not transferred to the text. (3) Solution (a) For the 176gsm or less weight paper, set the lower pressure for the expert setting of the tray setting. Set the 2nd transfer pressure to [Low] from the expert adjustment of the tray setting. Change the DipSW1-0 from 0 (Default) to 1 to show expert adjustment. [Service] mode→[System Setting]→[Software DIPSW Setting] Set [Paper Setting]→[Change Set]→[Expert Adj.]→[2ndTransPressure]→[Low] (b) Change the belt speed difference between drum – Intermediate transfer belt. DipSW143-4/5 Note Print accuracy or transfer ability may get poorer. Adjust while checking the image. Color registration ability may become poorer and torque abnormality may possibly occur. Table of contents 4 5 Drum speed gap adjustment (Drum speed against the transfer belt) 0 0 +0% (Default) 1 0 +0.3% 0 1 +0.6% 1 1 +0.9%
KONICA MINOLTA Confidential 98 1.3.21. Secondary color text scatters (1) Symptom Red, blue and green texts look like blurred. (2) Cause For the dark red, blue and green texts and so on are the secondary color and the toner attaching amount reaches near 200% which is too much. When the ambient environment is low temperature and low humidity, the toner may scatters around the text. Specifically, when the background color is white, the edge gets blurred and the text looks blurred. (3) Solution 1. On the printer driver setting, enable the text color text blur prevention (a) IC-602 Access [Imaging] check [Color Text Blur Prevention], on [Outline Process] For the Object, select [Text/Graphics] or [Text/Graphics/Image] Object is commonly applied to other outline processing. Therefore, if the blur appears for the text and thin line only, we recommend [Text /Graphics]
KONICA MINOLTA Confidential 99 (b) IC-308/IC-415 Access [Image] tab, and check [Color text blur prevention] at [Edge enhancement] At the Apply enchantments to; select [Text/graphics]. Note When the Color text blur prevention is enabled, comparing with the disabled, the blur at dark red, blue, green and shadow is improved. On the other hand, the chroma is slightly lowered or when the image is checked with magnification, screen pattern is recognized easily. 2. Set the Color text blur prevention effect level When the function is enabled, the effect level is selectable by 2-steps. When the 0 is not enough, try the setting 1 DIPSW Setting to set effect level DipSW 0 1 2-3 (Image area) Default correction Stronger correction 2-4 (Text/Graphic area) Default correction Stronger correction Note When the setting is enabled, the side effect may gets worsen. Be sure to conduct adjustment while checking the image. Table of contents