My 2 cents contribution.
By sniffing the network exchange between my wife's mac and the printer,
I was able to catch the content of the job.
And bingo, the 4690MF is also a lava printer.
I installed the 2490MF printer driver and I was able to use the printer to print.
There's just some minor adjustment like margins and icc profile that are provided in the Mac Driver.
Forum: General foo2lava