Image Unit - RD -3108C Service Manual

Section 6 : Image unit
1. The unwanted background of an original is showed on copies.
Solution: a. Check original and see if it is ok.
b. Adjust the scan density,select lighter.
c. Change the voltage of "Dark". (Page 15)
2. No images on copies.
Solution: a. Check the scan glass whether there is original on it.
b. Test print for several sheets and check whether the ink is empty.
c. Check whether the drum is wrapped with copies.
d. Check the voltage of Thermal Print Head. (standard:12.4v)
3. All black on copies.
Solution: a. Check whether the scan cover is open during scaning.
b. Check whether the date line of scan unit is connected well.
c. Check the voltage of change-over board. (+15v ,-12v)
d. Check the connect wire between chang-over board and mainboard.
4. Copies are incomplete: some images are missing or unclear.
Solution: a. Check whether the scan glas is stained .
b. Check whether a foreign object or piece of master may be wrapped around the drum.
c. Check whether scan cover is open during scaning.
- 46 -