Howtek D4000 Drum Scanner Lines

Discussion in 'Scanning and Scanners' started by Fixcinater, Feb 6, 2017.

  1. Fixcinater

    Fixcinater Member

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    I've been slowly working my way through reviving a Howtek D4000 with the COSMYK 860 chip. Mirrored Drive Doors Mac tower running OS X 10.4.11 and Silverfast in demo mode. Firmware has been updated by me to R535.

    Replaced:
    Bulb, twice over
    Drive belt
    O-ring on the drum driveshaft/mounting point
    Drum pads
    Added transformer based power supply filtering between wall AC and scanner, no change
    Cleaned calibration area on drum (was clean but just making sure no tape or residue existed)
    Lubricated the lead screw (was bone dry when it came to me)
    Cleaned the lead screw thinking I had over-lubricated it, no change
    Made sure temp in room is higher than 50F, no change
    Kept scanner on for multiple hours, no change

    Attached are two files that show the difference between 1K dpi and 2K dpi, otherwise all settings exactly the same.

    Still getting this awful line whenever I scan something at 2K dpi or higher. I've attached two small crops showing the lines.


    Potential issues I still see:
    -Lamp intensity fluctuates during scan. Does not seem to have a pattern, whereas the lines in the scans do seem to be regular.
    -When I lubed the lead screw, the variance between the darkest parts of the lines and lightest seemed to diminish.
     

    Attached Files:

  2. OP
    OP
    Fixcinater

    Fixcinater Member

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    Did some more work on it between last posting and now:

    -Cleaned and cleaned again the pulleys for the drive belt.
    -Cleaned and lubed the lead screw again.
    -Cleaned and lubed the tailstock bearing.
    -Cleaned the same drum I had been using.
    -Re-did the DIY pads I had been using, slightly thinner so they were all within the small recess as the factory pads are. Before, some were slightly too wide which led to the drum not centering correctly on the tailstock.
    -Cleaned the dust out from behind the FOPI, on that lens.
    -Cleaned the lens on the other side of the FOPI, illuminator lens?

    Now does 2K dpi scans with no hint of lines so that's a big relief.
    Next thing to suss out is now when I set 4K DPI in Silverfast, it always returns an F702 error when checking lumens. At 1K, 2K there is never a problem but at 4K each and every time it pulls the error code.

    Sample shot attached:

    Wartime black paint Anniversary Speed GraphicBlack paint Kodak Ektar 127/4.7HP5 in HC110 1:100 semi-stand
    Blue painter's tape, dry mounted
    Scanned at 2K DPI

    Here is the result:
    [​IMG]
    Howtek D4000 Drum Scanner Lives Again by Dead Link Removed, on Flickr
     
  3. Pasto

    Pasto Subscriber
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    Hi, just came upon your thread. Am wondering how things turned out with your D4000? I've been going through a similar revival program for about a month now. Your experiences may be helpful. Just for background:

    Scanner: Howtek D4000
    Computer: AMD Phenom 9650 quad core, Windows XP professional SP3, Adaptec 2906 SCSI adapter
    Software: Trident, Aurora, and Silverfast 6.6 all in demo mode.

    Problem 1: Was getting multiple lamp/mirror R (or RGB), Error F719.
    Solutions (?): Disassembled all control boards from scanner, cleaned all accessible connectors including slots for control boards, and grounds with connector cleaner, fixed problem with my drums' end-caps becoming unglued from cylinder causing index mark on left end-cap being out of alignment with top scribe line in calibration area, replaced bulbs, kept scanner on for several hours. This problem is largely solved now, I hope.

    Problem 2: Since fixing 1, I've been able to get good scans (both reflective and transmission) with all the scanner software. Then all of a sudden received a calibration...F702 error, and continue to do so.
    Solution (in progress): change drive belt, as well as replace the drive motor and encoder connectors (as per Evan's instructions at Aztek). Now waiting for parts.
     
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