noritsu 1314 Light source evenness is out of allowable range - 3300 - S3

[dailysetup]

I have one QSS-3300 . The “S-3” Film scanner is now having the same error no. 1314 [ Light source evenness is out of allowable range] every light source setup . We have followed the Corrective Action to clean the parts in the Light Source Section and Photometry Section, referring to machine manual, but this error no. remains everyday. 
Please Help.

[Minilab service]

Probably light is week. Check voltages on power suppliers ( scanner Multi power supply, scanner power supply 1 and scanner power supply 2 ) . Clean well whole scanner section ( LED glass, AFC lens and CCD glass ) . Make sure that AFC lens is not scratched. Check tilt - swing adjustments. Make light source registration, area registration, focus adjustment, light source registration, CCD calibration. If all that will not help then can be LED, LED driver pcb, or board beside CCD.