20 Most Recent Fujitsu fi-4750C Flatbed Scanner Questions & Answers

Hi Rasha,ADF backside scanning optical alarm (upper optical unit ADF) is E3 alarm. When there is an irregularity in the amount of light (ADF back), "E" and "3" will be displayed alternately on the function number display panel of the scanner. Please check the followings:1.Does the same symptom occur after turning OFF and ON the scanner?2. Is the lower glass (white sheet guide) of the reading section dirty? Open the ADF, and clean the sheet guide (white part) and the glass. 3. Is the upper Optical unit ADF dirty? Are the cables damaged? Are the connectors connected properly?4.E3: Is the upper lamp ON? Are the cables damaged? Are the connectors connected properly? Disconnect the SCSI cable and turn the scanner ON. Open the ADF and press ADF cover open sensor as shown below to see if the ADF lamps light which has to be replaced.I would recommend to contact an authorized FUJITSU scanner service provider or the dealer where you purchased the scanner.Hope the above information is helpful.Thanks & regards,ScanCare

If "Front Side Optical Alarm" appeared, clean the glass (small and large one) of the flatbed and carrier unit.
If the issue persists, then check if CCD harness or CR cable is disconnected? Connect the connector.
If the issue persists, then replace Front lamp.
If the issue is not resolved, then replace the Control PCA or Carrier unit or Optical unit.

regards,

Tech Satya

Check if the paper size selected is same as that of the paper fed in. Clean the sensor in the ADF and remove if any scrap of paper is stuck.
S. Mohan

This is usually a main board fault. re solder the legs of the 2 sets of the 3 transistors on the underside of the mainboard. they are the small ones. or replace the main board. let me know how you get on

Try a flatbed scan scan with the cover open.  If you see the lamp come on, it's likely a cable or CCD problem, though it can be caused by a really dirty reference strip or mirrors. I've never seen one that dirty but it's mentioned in the service manual. I have seen lost documents in the ADF unit cause backside optical alarms, but the front unit is protected from this by glass. If the lamp doesn't light, it can be a defective lamp or cable. In all these cases, you'll need a tech onsite. Disassembly of this model is difficult & reassembly is even worse. I wouldn't recommend it even if you're mechanically inclined.

1.st step remove the software from the computer and then reboot. 2nd step install the software. 3rd step try a scan. Still in trouble? 4th step new scanner These items are not repairable.