The positions of larger spikes are shown by the numbers (cm or inch units) opposite to the spikes. The numbers refer to the Sideload-ruler on the scanner. Larger spikes going downwards are often caused by dust, dirt, scratches, or similar defects on the Glass Plate and may be removed by cleaning the Glass Plate. Downward spikes often show up as darker vertical lines in the scanned image. Larger spikes going upwards are often caused by dust or dirt present on the Glass Plate during the last calibration with Scanner Maintenance.
These defects are memorized by the Light Profiles stored in the Flash Memory and can only be removed by cleaning of the Glass Plate followed by running Scanner Maintenance again. Upward spikes show up as very bright vertical lines in the scanned image. White vertical lines in the scanned image may be found even if Noise Test shows a perfectly ‘clean’ scanner. In this case, the cause may be white dust or particles on the backside of the Glass Plate having the same color as the white background. In this case, the Light Profiles of Service Tools, Test 9 may show upwards going spikes when a dark original is placed in the scan area. Test 28:
Original Guide Sensor Test This is to test the Guide Plate Sensors which are located under the Guide Plate. See Original Guide Sensor Test. Test 30: Calibrate ATAC (Automatic Thickness Adjustment Control) This test sets the current level at which the ATAC will stop if something is preventing it from moving down. See Calibrate ATAC (Automatic Thickness Adjustment Control). Test 31: Driver Board Communication Test This test checks the communication between the Scanner and the Driver Board. See Driver Board Communication Test. Test 42: Backup Calibration and statistics Use this option to backup the calibrations and the scanner accounting values onto a USB drive. Test 43:
Restore Calibration and Statistics Use this option to restore the calibrations and accounting values previously backed up onto a USB drive. Test 45: Operator Panel Key Test This test checks the functionality of the Keys on the Operator Panel. When pressing each of the keys, the test will show that the key has been activated, and will show if the result is correct or not. 6 Chapter 1 Troubleshooting ENWW