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Question about Visioneer OneTouch 7100 Flatbed Scanner

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Lock On Error

I get Locked scan head error When I try to scan. I figured out that the scanner looks for black, then white on the underside of the flatbed at the beginning of scan cycle not seeing this it assumes the head did not move and it therefore locked. Lamp works. Stepper motor drive system works. One touch software detects scanner as present. I found 4 expled 100 ufd 15 V caps on logic board and replaced them. No help. The circuit appears to be similar to a series 5 V regulator in my Radio Shack Power Supply Book. I think part marked TR3 is blown. TR3 screened onto logic board. Chip is 3 lead + heat sink tab transistor and has B A R U printed on it as part ID in 2 lines. I cannot figure out exactly which lead is which except that tab is collector. I tried replacing with both PNP and NPN transistors and neither help. Unit draws 470- 480 ma at 12 v from a lab quality DC supply.

Posted by ArizonaHiker on

  • 1 more comment 
  • ArizonaHiker Aug 09, 2007

    Thanks for the thought. The physical lock is not on. In the first inch of travel the scan head passes pure black, then pure white on the underside of the flatboard glass mounting frame. The software looks for that difference in output to calibrate, I think, but also to decide that the head is moving. When it does not see the black/white pattern while the stepper motor is running it thinks the head is not moving and produces the Locked error message. In fact the head is moving but no output is being seen somewhere. I'm hoping it is just power to the A-D chip and if I can fix the power problem I will have a working unit. That is why I am trying to find info about the TR3.

  • healy62 Nov 26, 2007

    Did you guys ever figure out a fix?

  • sios012003 May 14, 2008

    The same thing, mi 7100 doesn't run in win sp2, everything seems to work fine,  find  the scanner, paperport also works, light is on, but whe is going to scan always got the lock error (of course it's unlocked) ¿you now how to fix that?



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Um just as a thought, but often there is a physical "head Lock" thats used when transporting the unit, are you sure this hasn't been activated? Just a thought.

Posted on Aug 09, 2007


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