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Posted on Aug 10, 2009
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SHARP SF 2540 How to troubleshoot U3-20 and u7-00 ROMBLON

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  • Contributor 29 Answers
  • Posted on Aug 19, 2009
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Joined: Aug 18, 2009
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U3,20 - Mirror motor lock detection

U7 00 - Communication trouble between PC/Modem and the copier.

Seems to me the U3 error is something similar to the L6 errors in the slightly newer machines. It seems as though the laser moter in your machine has seized.

As for the U7, i have had this error out on the field before. Especially when the machine has had IP setting put into the machine but the network cable isn't plugged in. Throws up that bad boy =]

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