Question about Visioneer OneTouch 7100 Flatbed Scanner
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.
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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Posted on Jan 02, 2017
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