1. © 2007 Hewlett-Packard Development Company, L.P. The information contained herein is subject to change without notice HP CM8060/8050 Color MFP with Edgeline Technology Service and Support Training Image Quality Module

2. Image Quality Image pipeline Calibrations and adjustments Test pages IQ troubleshooting

3. May 2007 – HP Restricted 3 Topic 1: Image pipeline (overview) Copy Processing PCA (A27) CCD PCA (A503) AFE PCA (A502) Formatter Main PCA (A29) Network/Fax PCA (A30) Client PC Main Engine PCA (A4) Image Processing PCA (A6) Pens Digital sendPrint job Scanned image Copy and DS path Print path

4. May 2007 – HP Restricted 4 Image pipeline L*a*b* to CMY color space conversion Copy path and digital send image processing Fringe removal Contrast Sharpening Full resolution, uncompressed, un-rotated image for advanced functions RGB to L*a*b* 1 color space conversion L*a*b* CMYCMY X and/or Y scaling Resolution down scaling C M Y K to formatter CCD PCA (A503) Converts incident light reflected off the original into analog voltage signal. Uses white reference guide to set white and black point. Adjusts for non-uniformity of CCD elements along scan bar. Gamma correction based on pre-computed compensation table. Compensates for gaps between CCD rows. R G B AFE (Analog Front End) PCA (A502) Copy Processing PCA (A27) R G B 8 bit 600 dpi 75 dpi DS/fax support different resolutions 300, 200, 150, 75 dpi. Scaling 25 to 400% Low resolution image to formatter Color adjustments Background removal Color saturation One/two color CMYK sliders K text enhancement K Low resolution analysis results from formatter Scanner image processing 1 L*a*b*: CIE LAB device-independent color space DS to formatter or DS job PDF, JPG, TIFF, MTIFF Copy Job R G B Apply down scaling to create a low Res. image @ 75 dpi

5. May 2007 – HP Restricted 5 Image pipeline – formatter print job/copy processing Network / Fax PCA Page rendering, Includes rotation required by print engine Print Driver Postscript PCL/PCLXL Color profiles? No Yes RGB or K input transformed to K output CMYK To CMY RGB to CMY sRGBsRGB CMYCMY Apply borders, stamps, watermarks, etc. Print job C M Y or K Compression Formatter Main PCA (A26) CMYCMY No Yes * CRD: Color Rendering Dictionary Print engine supports CMY only. SWOP, Euro, DIC, etc. emulations are handled here. Yes No Mono / Gray CMYCMY K sRGBsRGB sRGBsRGB HDD C M Y or K Copy C M Y K from CPB DS C M Y K from CPB Digital send CMYKCMYK Copy with features C M Y K Compressed image to main engine PCA Low resolution analysis Anti-counterfeiting, auto color, auto type, auto contrast. 75dpi image GRGR Color? Default CRD* ?

6. May 2007 – HP Restricted 6 Image pipeline - engine Com- pressed data Tone dependent fast error diffusion halftoning BRANCHBRANCH Main Engine PCA (A4) Decompression Linear Text edge smoothing Bonding agent generation Pen firing timing Generate pen data Drop DRAM Image Processing PCA (A6) C1 BA Pocket PCA BA DRAM / data to Image Processing PCA CMYCMY CMYKCMYK CMYKCMYK K CMY To RGB CMYCMY To Device KCMY Raster data RGBRGB CMYKCMYK CMYKCMYK 17^3 Look up table. Color map is a function of input path and driver/copier U/I settings. C2 BA Pocket PCA BA C1 CM Pocket PCA MCMC C2 CM Pocket PCA MCMC C1 KY Pocket PCA KYKY C2 YK Pocket PCA KYKY C M Y K BA Expands K from 600 to 1200 DPI BA C M Y K BA * Color and BA expanded to 1200 dpi. * Masks applied for multi-pass printing. * HW nozzle replacement. Pen firing timing Generate pen data Drop DRAM C M Y K BA * ASIC 1 controls 1 BA and 2 KY. * ASIC 2 controls 1 BA and 2 CM. K Normal 2 bit/pixel Best 1 bit/pixel

7. March 2008 – HP Restricted 7 Topic 2: Calibrations and adjustments

8. March 2008 – HP Restricted 8 CDFT Engine Calibrations 1 screen Choose tray to use for some calibrations

9. March 2008 – HP Restricted 9 CDFT Engine Calibrations 2 screen

10. May 2007 – HP Restricted 10 Tetris ToF The amount of drum rotation between Tetris and the first black nozzle of the pens and carriage 1 & 2 encoder positions Encoder marks Index mark Light to dark transition resets encoder count First nozzle position calibration

11. May 2007 – HP Restricted 11 Media side-edge calibration The position of the carriage encoder where the Tetris sensor sees the side edge of the media

12. May 2007 – HP Restricted 12 New Pen Installation Flow Chart

13. Lab

14. May 2007 – HP Restricted 14 Topic 3: Test pages Used with nozzle health plot, turns error handling on or off. When off, it ignores nozzle health report of bad nozzles and tries to print with all nozzles of pen. When on, prints with bad nozzles turned off. Turns on and off pens

15. Lab

16. Interpreting the nozzle health test page C1, P3, D1 C1, P3, D2 C1, P3, D3C1, P3, D5 C2, P3, D2 C1, P3, D4 C2, P3, D4 C2, P3, D1C2, P3, D3C2, P3, D5 C1, P2, D1 C1, P2, D2 C1, P2, D3C1, P2, D5C2, P2, D2 C1, P2, D4 C2, P2, D4 C2, P2, D1C2, P2, D3C2, P2, D5 Bonding agent checkerboard CM pens YK pens Carriage 1 Carriage 2 Spit bar

17. May 2007 – HP Restricted 17 Odd bonding agent die slot Even bonding agent die slot Black without Bonding Agent Black with Bonding Agent 24 nozzles Interpreting the bonding agent nozzle health (black checkerboard pattern) Bonding agent die Odd bonding agent die slot Even bonding agent die slot In order to evaluate bonding agent you must use non “ColorLok” media. If “ColorLok media is used, all blocks will look black. Bonding agent is printing at 600dpi and 9kHz. Each die contains two checkerboards -- one per die slot. Each cell in the checkerboard is printed with 24 nozzles. The black cells are printed with black and bonding agent, the gray cells are just black ink. If the checkerboard pattern is clearly visible, then bonding agent is working. Each cell represents one address, if a complete cell is missing it may indicate and electrical problem. One cell missing one address.

18. May 2007 – HP Restricted 18 Interpreting nozzle health in C/M die Each bar is made up of 20 spits from a single nozzle (@18kHz). Each of the 12 rows of bars in the pattern corresponds to one address. The bars should step down uniformly. 5 2109 2111 9 13 17 21 25 29 33 37 41 45 1 49 7 11 15 19 23 27 31 35 39 43 47 3 Even die slot (magenta) 6 2110 2112 10 14 18 22 26 30 34 38 42 46 2 50 8 12 16 20 24 28 32 36 40 44 48 4 CM die Odd die slot (cyan) Column 2 Column 1 Column 2 1/600” 1/1200” Nozzle physical spacing (staggered) Column 2 Column 1 1 3 5 7 Even die slot 2 columns Odd die 2 columns

19. Pen alignment test page Carriage 1 and 2 : Pen to pen & Die to die Carriage to Carriage Vertical Carriage 2: Pen to pen & Die to die Horizontal -3 -2 0 1 2 3 Carriage 1: Pen to pen & Die to die Carriage to Carriage Horizontal Pen Alignment Plot Version 1.0 March 2006

20. Pen alignment test page (Horizontal verification) -3 Spit bar Carriage 2 -2 0 1 2 3 -3 -2 0 1 2 3 Spit bar Carriage 1 Die 1Die 2Die 3Die 4Die 5Die 1 in C2 Die 1Die 2Die 3Die 4Die 5 Die-to-die alignment Pen-to-pen alignment All colors have to be aligned to black in the 5 die along the “0” zone. Carriage-to-carriage horizontal alignment 5 die need to be aligned in the “0” zone for all colors Check that all colors (YMCK) in the five die of each carriage are aligned to black in the “0” zone Pen-to-pen horizontal alignment is evaluated at the areas marked in yellow and red The die-to-die horizontal alignment is evaluated in the green areas Carriage-to-carriage alignment is evaluated in the blue area Die-to-die alignment Pen-to-pen alignment A A A

21. Pen alignment test page (Vertical verification) -3 -2 0 Spit bar 3 2 1 Carriage 2 pen-to-pen alignment Carriage 1 pen-to-pen alignment Carriage-to- carriage vertical alignment 5 die need to be aligned in the “0” zone for all colors C2 C1 Die 1sDie 2sDie 3sDie 4sDie 5sC1 to C2 Carriage 1 die1-to-die2 alignment Carriage 2 die1-to-die2 alignment C2 C1 Check that all colors (YMCK) in each die are aligned to black in the “0” zone Pen-to-pen vertical alignment is evaluated at the areas marked in yellow and red The die-to-die vertical alignment is evaluated in the green areas Carriage-to-carriage alignment is evaluated in the blue area AAA

22. May 2007 – HP Restricted 22 Topic 4: IQ troubleshooting 1. Determine whether problem is a print or copy defect (Use “Initial actions for image-quality troubleshooting” procedure) 2. Review print or copy defects in Image Quality Troubleshooting manual to find one that matches the problem you’re seeing 3. Use the Image Quality Troubleshooting manual to troubleshoot the defect or Use “Scan and analyze” in CDFT-L to determine if the image quality is within specifications 4. Verify that the defect has been fixed, or is within specifications

23. May 2007 – HP Restricted 23 Determining the type of image quality defect Start by printing test pages Is the defect present in any of the test pages? You have a print defect You have a copy defect Is the defect present in the copy? Copy one of the test pages to determine if this is a copy defect Check for media mismatch or configuration problems Yes No

24. May 2007 – HP Restricted 24 IQ troubleshooting Sample from field service manual

25. May 2007 – HP Restricted 25 IQ troubleshooting with scan and analyze

26. Lab