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54831M Passes ALL Self Tests but won't calibrate channel 4

Question asked by tonykara001 on Dec 18, 2008
Sorry for my other post, it has the wrong scope model listed.
It's a 54831M. I I opened it up and I see signal heading out of the attenuator area toward the A/D module, and it even displays signal on the screen, It just can't pass CAL. Is there a separate signal path for CAL that the self test wouldn't check? I could really use some help.  

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