Firmware of ml 1666

SOURCE: Cannot install the Win 7 64-bit printer driver-Samsung ML-1640

http://www.samsung.com/za/support/detail/supportPrdDetail.do?menu=SP00&prd_mdl_cd=ML-1640%2FXFA&prd_mdl_name=ML-1640&prd_ia_sub_class_cd=P

download here and run the file in administrator

SOURCE: Driver for Samsung ML-1640 for WIN98SE

I got the same problem. It seems they did not develop specific drivers for win98se. However, I found that you can print using the drivers for the old Samsung ML-2510. Win98se drivers for that printer can still be downloaded from Samsung website. I've been using the 2510 drivers with the 1640 printer for a couple of months, and worked fine so far. It seems very little change in electronics from the 2510 to the 1640 model.
You need also Virtual Printer Port for USB from microsoft.

SOURCE: Installation problems SamSung ML 2510 printer with Windows XP

Why no updates? No windows validation? That could be your problem if that's the case.
If not, I suggest going to Windows update and at least installing all critical updates, if not SP3 as well, and try again

SOURCE: in samsuung ml 1640 laser printer red light is continiously blink

call me or visit my web saite www.compudesk.in
9328015664

SOURCE: My laser Printer ML-1640 & ML-2240 shows a

Here it is:

http://img528.imageshack.us/img528/7835/reset.jpg

I have tested this on a printer with the following versions:

OS Version - 1.01.00.78
Engine Version - 1.00.49
SPL Version - 5.07

I am using the original initial cartridge.

I think if you want to use a replacement cartridge, you have to disconnect CN5 and short out CN9. This way the toner will always be treated as the initial cartridge.