Brother MFC 9840CDW User Manual
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Troubleshooting and routine maintenance 119 C Improving the print qualityC If you have a print quality problem, print a test page first (Menu, 4, 2, 3). If the printout looks good, the problem is probably not the machine. Check the interface cable or try the machine on another computer. Note You can resolve a print quality problem by replacing a toner cartridge with a new one when the LCD shows the Toner Life End message. Examples of poor print qualityRecommendation White lines or bands or ribbing across the page „Make sure that the machine is on a solid level surface. „Make sure that the toner cartridges are installed properly. (See Replacing a toner cartridgeon page 169.) „Shake the toner cartridges gently. „Make sure that the drum unit is installed properly. (See Replacing the drum uniton page 174.) „Make sure that you use paper that meets our specifications. A rough surfaced paper or thick print media can cause the problem. (See Acceptable paper and other mediaon page 11.) „Clean the laser scanner windows with a soft cloth. (See Cleaning the laser scanner windowson page 151.) „The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum uniton page 174.) Colours are light or unclear on the whole page. „Make sure that the recommended paper was used. „Change the paper to freshly unpacked paper. „Make sure that the front cover is closed properly. „Shake the toner cartridges gently. „Clean the laser scanner windows with a soft cloth. (See Cleaning the laser scanner windowson page 151.) „Turn off Toner Save. (See Toner saveon page 26.) White streaks or bands down the page „Shake the toner cartridges gently. „Clean the laser scanner windows with a soft cloth. (See Cleaning the laser scanner windowson page 151.) ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
120 Coloured streaks or bands down the page „One of the toner cartridges may be damaged. Replace the toner cartridge that matches the colour of the streak or bond. „Clean all four corona wires (one for each colour) of the drum unit by sliding the green tab. (See Cleaning the corona wireson page 155.) „Make sure each corona wire’s green tab is at the home position (b). „The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum uniton page 174.) „The fuser unit may have a smudge mark. Call Brother or your dealer for service. Coloured lines across the page „One of the toner cartridges may be damaged. Replace the toner cartridge that matches the colour of the line. „The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum uniton page 174.) „Clean all four corona wires (one for each colour) of the drum unit by sliding the green tab. (See Cleaning the corona wireson page 155.) „Clean the laser scanner windows with a soft cloth. (See Cleaning the laser scanner windowson page 151.) White spots or hollow print „Make sure that you use paper that meets our specifications. (See Acceptable paper and other mediaon page 11.) „Make sure that the recommended paper was used. „Choose Thick paper mode in the printer driver or in the machine’s Paper Type menu setting, or use thinner paper than you are currently using. (See Paper typeon page 22 and Basic tab in the Software User’s Guide on the CD-ROM.) „Change the paper to fresh, unopened paper. „Check the machine’s environment. Conditions such as high humidity can cause hollow print. (See Choosing a locationon page 98.) „Clean all four corona wires (one for each colour) of the drum unit by sliding the green tab. (See Cleaning the corona wireson page 155.) If the print quality has not improved, put in a new drum unit. (See Replacing the drum uniton page 174.) „Clean the drum unit. (See Cleaning the drum uniton page 159.) Completely blank or some colours are missing. „Make sure that the toner cartridges are installed properly. (See Replacing a toner cartridgeon page 169.) „One of the toner cartridges may be damaged. Identify the missing colour and put in a new toner cartridge for the colour with the white line. (See Replacing a toner cartridgeon page 169.) „The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum uniton page 174.) Examples of poor print qualityRecommendation ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
Troubleshooting and routine maintenance 121 C Coloured spots at 75 mm „Dust, paper powder, glue, and so on may stick to the surface of the photosensitive drum (OPC) and cause black or white spots to appear on printed documents. „Make a few copies of a blank, white sheet of paper. (See Making multiple copieson page 78.) „If you still see the spots on printed documents after making multiple copies, clean the drum unit (See Cleaning the drum uniton page 159.) „If the print quality still has not improved you need to install a new drum. (See Replacing the drum uniton page 174.) Toner scatter or toner stain „Check the machine’s environment. Conditions such as high humidity and high temperatures may cause this print quality problem. (See Choosing a locationon page 98.) „Make sure that you use paper that meets our specifications. Rough- surfaced paper may cause the problem. (See Acceptable paper and other mediaon page 11.) „Install a new toner cartridge for the colour causing the problem. (See Replacing a toner cartridgeon page 169.) „Clean the corona wires and the drum unit for the colour causing the problem. (See Cleaning the corona wireson page 155 and Cleaning the drum uniton page 159.) If the print quality has not improved, put in a new drum unit. (See Replacing the drum uniton page 174.) Grey or coloured background „Make sure that you use paper that meets our specifications. (See Acceptable paper and other mediaon page 11.) „Check the machine’s environment. Conditions such as high temperatures and high humidity can increase the amount of background shading. (See Choosing a locationon page 98.) „Install a new toner cartridge for the colour causing the problem. (See Replacing a toner cartridgeon page 169.) „Clean the corona wires of the drum unit for the colour causing the problem. (See Cleaning the corona wireson page 155.) If the print quality has not improved, put in a new drum unit. (See Replacing the drum uniton page 174.) Page skewed „Make sure the paper or other print media is loaded properly in the paper tray and that the guides are not too tight or too loose against the paper stack. „Set the paper guides correctly. „The paper tray may be too full. „Make sure that you use paper that meets our specifications. (See Acceptable paper and other mediaon page 11.) Examples of poor print qualityRecommendation ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. 75 mm 75 mm ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxy z. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxy z. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxy z. ABCDEFGHIJKLMNOPQRSTUVWXYZ . 0123456789. abcdefghijklmnopqrstuvw xyz.
122 Ghost „Make sure that you use paper that meets our specifications. Rough- surfaced paper or thick paper may cause the problem. (See Acceptable paper and other mediaon page 11.) „Make sure that you choose the correct media type in the printer driver or in the machine’s Paper Type menu setting. (See Acceptable paper and other mediaon page 11 and Basic tab in the Software User’s Guide on the CD-ROM.) „The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum uniton page 174.) The colour of your printouts are not what you expected.„Make sure that the toner cartridges are installed properly. (See Replacing a toner cartridgeon page 169.) „Make sure that the toner cartridges are not empty. (See Toner life end messageon page 169.) „Make sure that the drum unit is installed properly. (See Replacing the drum uniton page 174.) „Make sure that the belt unit is installed properly. (See Replacing the belt uniton page 181.) „Perform the calibration by using the control panel. Press Menu, 4, 6. aPress OK to select Calibrate. bPress 1 to select Yes. (For more information, see Software User’s Guide on the CD-ROM.) „Adjust the colour by using the custom setting in the printer driver. Colours the machine can print and colours you see on a monitor are different. The machine may not be able to reproduce the colours on your monitor. „Make sure that you use paper that meets our specifications. (See Acceptable paper and other mediaon page 11.) „The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum uniton page 174.) „Put in a new belt unit. (See Replacing the belt uniton page 181.) All one colour„Clean the corona wires of the drum unit for the colour causing the problem. (See Cleaning the corona wireson page 155.) If the print quality has not improved, put in a new drum unit. (See Replacing the drum uniton page 174.) „The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum uniton page 174.) Examples of poor print qualityRecommendation
Troubleshooting and routine maintenance 123 C Colour misregistration „Make sure that the drum unit is installed properly. (See Replacing the drum uniton page 174.) „Make sure that the belt unit is installed properly. (See Replacing the belt uniton page 181.) „Make sure that the waste toner box is installed properly. (See Replacing the waste toner boxon page 186.) „Perform the auto colour registration by using the control panel. Press Menu, 4, 7, 1. or „Perform the manual colour registration by using the control panel. aPrint the correction chart by using the control panel. Press Menu, 4, 8, 1. bEnter the correction value on the chart. Press Menu, 4, 8, 2. If the colour misregistration is not corrected after registering the colour manually, take all the toner cartridges out of the drum unit and turn the drum unit over, then make sure that four drum unit gears are in the home position. The home position of each drum can be identified by matching the number on the drum unit gear to the same number on the side of the drum unit as shown in the illustration. „The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum uniton page 174.) „Put in a new belt unit. (See Replacing the belt uniton page 181.) „Put in a new waste toner box. (See Replacing the waste toner boxon page 186.) „If solid areas of colour or images have cyan, magenta or yellow fringes, you can use the auto-registration feature to correct the problem. Examples of poor print qualityRecommendation ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
124 Uneven density appears periodically across the page „Identify the colour that is uneven and put in a new toner cartridge for that colour. (See Replacing a toner cartridgeon page 169.) „The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum uniton page 174.) „Make sure that the fuser unit is installed properly. Missing image at edge „Make sure that the toner cartridges are installed properly. (See Replacing a toner cartridgeon page 169.) „Make sure that the drum unit is installed properly. (See Replacing the drum uniton page 174.) „One of the toner cartridges may be damaged. Identify the missing colour and put in a new toner cartridge for the colour with the white line. (See Replacing a toner cartridgeon page 169.) „The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum uniton page 174.) Missing image at thin line „If you are using a Windows ® printer driver, open Properties window, and then click Printing Preferences. Choose the Advanced tab, Device Option, Print Setting, and then check the Improve pattern printing or Improve Thin Line boxes. Wrinkle „Change to the recommended type of paper. (See Recommended paperon page 11.) „Check the paper type and quality. (See Acceptable paper and other mediaon page 11.) „Make sure that the back cover is closed properly. „Make sure that paper is loaded properly. „Make sure that you choose the correct media type in the printer driver or in the machine’s Paper Type menu setting. (See Acceptable paper and other mediaon page 11 and Basic tab in the Software User’s Guide on the CD-ROM.) „Turn over the stack of paper in the tray or rotate the paper 180° in the input tray. „Make sure that the drum unit is installed properly. (See Replacing the drum uniton page 174.) „Make sure that the fuser unit is installed properly. „If the problem continues, call your Brother dealer. Insufficient gloss„Change to the recommended type of paper. (See Recommended paperon page 11.) Examples of poor print qualityRecommendation ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
Troubleshooting and routine maintenance 125 C Offset image „Check the machine’s environment. Conditions such as high temperatures and humidity can cause this problem. (See Choosing a locationon page 98.) „Make sure that you use paper that meets our specifications. (See Acceptable paper and other mediaon page 11.) „Make sure that you choose the correct media type in the printer driver or in the machine’s Paper Type menu setting. (See Acceptable paper and other mediaon page 11 and Basic tab in the Software User’s Guide on the CD-ROM.) „Change to the recommended type of paper. (See Recommended paperon page 11.) „The drum unit may be damaged. Put in a new drum unit. (See Replacing the drum uniton page 174.) Poor fixing „Make sure that you use paper that meets our specifications. (See Acceptable paper and other mediaon page 11.) „Make sure that you choose the correct media type in the printer driver or in the machine’s Paper Type menu setting. (See Acceptable paper and other mediaon page 11 and Basic tab in the Software User’s Guide on the CD-ROM.) „Make sure that the release lever of the fuser unit is in the closed position. „If the problem continues, call your Brother dealer. Poor fixing when printed on thick paper„Choose Thick paper mode in the printer driver or in the machine’s Paper Type menu setting. (See Paper typeon page 22 and Basic tab in the Software User’s Guide on the CD-ROM.) „Make sure that you use paper that meets our specifications. (See Acceptable paper and other mediaon page 11.) Examples of poor print qualityRecommendation ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.
126 Curled or wave „Make sure that you choose the correct media type in the printer driver or in the machine’s Paper Type menu setting. (See Acceptable paper and other mediaon page 11 and Basic tab in the Software User’s Guide on the CD-ROM.) „Check the paper type and quality. High temperatures and high humidity will cause paper to curl. „If you do not use the machine often, the paper may have been in the paper tray too long. Turn over the stack of paper in the paper tray. Also, fan the paper stack and then rotate the paper 180° in the paper tray. „Follow these steps: aOpen the back cover. bPush the grey lever to the right as shown below. cClose the back cover and re-send the print job. Note When you have finished printing, open the back cover and reset the lever back to the original position. Examples of poor print qualityRecommendation
Troubleshooting and routine maintenance 127 C Envelope creases aOpen the back cover. bPull down the two grey levers, one on the left-hand side and one on the right-hand side to the envelope position, as shown in the illustration below. cClose the back cover and re-send the print job. Note When you have finished printing, open the back cover and reset the two grey levers back to the original position. Examples of poor print qualityRecommendation ABCDEFGEFGHIJKLMN
128 White lines or ribbing down the page on duplex print Note Position B is only for duplex printing with recycled paper when the temperature and humidity are low. „Choose Thin Paper mode in the printer driver and re-send the print job. If the problem is not solved after printing a few pages, follow these steps: aOpen the back cover. bPull down the two grey levers, one on the left-hand side and one on the right-hand side, to position B as shown in the illustration below. cClose the back cover. dChoose Plain Paper mode in the printer driver and re-send the print job. eIf the problem is not solved after printing a few pages, choose Thin Paper mode in the printer driver and re-send the print job. Note When you have finished printing, open the back cover and reset the two grey levers back to the original position. „Use thicker paper than you are now using. Examples of poor print qualityRecommendation ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz. ABCDEFGHIJKLMNOPQRSTUVWXYZ. 0123456789. abcdefghijklmnopqrstuvwxyz.