Hi Marcelo. I´m from Brazil, same CDJ-700s, same problem as yours. From what I´ve researched until now, DWY 1067 an DWY1069 ARE NOT FULLY INTERCHANGABLE
on CDJ-700s and maybe 500s. I think some newer 700s already came out with 1069 from factory, so this is why all this misunterstanding. On older 700s that came out with 1067, some SMD components must be changed in the mainboard in order to 1069 work properly. Mine came ou with 1067, I´ve replaced it with a 1069, didn´t worked well (sound skipped, or didn´t play at all).
In 2001 Pioneer released a replacement kit for this situation. The kit is named GXX1200, and includes the optical unit (DWY1069) which is included in the whole mechanical unit (DXXsomething, depends on model), and SMD resistors and capacitors for replacement. Dirty job, I know...
Since I already bought the replacement 1069´s, I´ll buy the SMD components too. I´ll let you know if will this work. Not an easy task, but I´ll try.
Here you can check the whole kit:http://www.chsinteractive.co.uk/electrical-components/general-components/lasers-optical-heads-ribbons-and-motors/laser-optical-heads-assemblys-original/pioneer/dxm1239a-gxx1200-laser-optical-head-assembly-replacement-kit-pioneer.htm
And here the documentation for the replacement:http://www.chsinteractive.co.uk/pdf_data/24001LM.pdf
Fernando Seiji Imay