DW800A CD read/write problem, DVD OK



I have “second hand DW800A drive”. It doesn’t recognize CD-R/CD-RW discs(no green led confirming disc presence after insert), but it reads and writes on DVD+R/RW. I have checked B3C7 and B2I7 firmwares - the same problem. It was manufactured in October 2003.
Anyone knows how to correct this problem?
Why it works with DVD and doesn’t work with CD media?
I have already cleaned laser-lens with isoprophyl alcohol and cleaned laser positioning mechnism.
Any suggestions welcomed.