Question about Visioneer OneTouch 7100 Flatbed Scanner

1 Answer

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 on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 12,061 Answers
Re: Lock On Error

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

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


3 Points

Related Questions:

4 Answers

I cannot use scanner Lide 25.. because show error : "release the lock switch,detach the I/F cable and reconnect" How solution?

Sounds like the scan head is locked. This is usually done so you can transport the scanner without bouncing the scan head out of alignment. Look under the scanner and you will see it. Make sure it's in the UNLOCKED position. You may need to power the unit off/on to reset it or restart your computer to get a fresh attempt at the scanner.

Mar 05, 2011 | Canon CanoScan LiDE 25 Flatbed Scanner

1 Answer

Scanner will not scan, says it is in locked position.

The locking tab protects the scanner's scan head by holding it securely in position. Lock the scanner when transporting it from one location to another, but always remember to unlock it before scanning. The scanner will not scan when locked

Looking the bottom, upside-down, with the back/bottom (power cord side) down. The lock is in the upper right corner. It is a slide style tab. Move up to unlock the bed.
Look on the users installation guide page 7 for illustration.
Need the guide, just ask.
Please let me know if this answers your question. OK

Thanks for using FixYa - a 4 THUMBS rating and POSITIVE Comment is really appreciated for the FREE answering of your question.

Feb 18, 2011 | Visioneer OneTouch 8920 Flatbed Scanner

2 Answers

Iam trying to scan a document on my flatbed xerox 4800 but it keeps saying please unlock your scanner then it gives me time to do it but i dont know where to unlock it

you might have two program trying to use the scanner at the same time & the scanner is confused.Find out what programs you are using.Hint...even printer programs may use scanner drivers. MUST use the EXACT scanner driver for your scanner. Windows will see the scanner "locked out"

Jan 06, 2009 | Xerox One Touch 2400 Flatbed Scanner

1 Answer

Trouble shooting

The "car sound" could be an indication that the scanner is locked. Check the lock switch on the bottom of the scanner. Move the switch back and forth a few times and then leave it in the locked position. Another possibility is that you are scanning heavy items such as books. If too much weight is placed on the scanner glass, then pressure could be enough to prevent the scanning element from moving as it should.

The code 201 sometimes can indicate a power issue...meaning the scanner is not getting enough power. Try connecting the usb cable to a different port on the computer (preferrably directly to the computer and not through a USB hub).

May 20, 2008 | Canon CanoScan LiDE 25 Flatbed Scanner

6 Answers

Canon LIDE 500F scanner does not scan - returns error message about releasing lock switch, detaching interface cable and reconnecting

Check the lock switch and make sure it is unlocked. I think the lock switch is on the bottom...or it may be under the lid near one of the hinges. Flip it back and forth and leave it in the unlocked position.

If this doesn't work, then it will most likely need service. Contact Canon Tech Support.

Apr 10, 2008 | Canon CanoScan LiDE 500F Flatbed Scanner

1 Answer

The scanner output problem

replace scanner ccd or replace scanner cable

Mar 17, 2008 | HP ScanJet 2400 Flatbed Scanner

2 Answers

Scanning speed problem

The scanners rated speed is for black and white all error correction turned off. As soon as you start doing 24bit colour or grayscale or up the dpi the scanner will start scanning more slowly. I personally get abpout 60ppm with my error correction on black and white 200dpi. (300 dpi scans just as fast although 400dpi will slow down).

Sep 28, 2007 | Canon DR-9080C Path-Through Scanner

2 Answers

Error message

Get another scanner. Check whether the lock has not been enabled at the bottom of the scanner. This has happened with me as well and a known Visioneer problem.

Sep 19, 2007 | Visioneer OneTouch 8920 Flatbed Scanner

2 Answers

Light stripe on scans

Possible causes, CCD failure, smudges or marks that can only be picked up by the CCD if the underside of the scanner glass is dirty. Uninstalling/reinstalling your scanner driver will eliminate if its software related or not. From the looks of it, could be with the CCD if the lines are in the same area with every scan attempted.

Aug 18, 2007 | Canon CanoScan LiDE 600F Flatbed Scanner

Not finding what you are looking for?
Visioneer OneTouch 7100 Flatbed Scanner Logo

156 people viewed this question

Ask a Question

Usually answered in minutes!

Top Visioneer Scanners Experts

Cindy Wells

Level 3 Expert

4718 Answers

Mohan Sriraman
Mohan Sriraman

Level 2 Expert

490 Answers

Sanath Kumar V

Level 3 Expert

684 Answers

Are you a Visioneer Scanner Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides