If the print rubs off the page, this means the toner is not being fused to the page. Fused......this is done by the fuser. This would have nothing to do with light print.
The dell (1600n and 1815n /1815dn) printer drivers has a toner saver mode, which can contribute to light print.
To turn Toner Save Mode off, (Windows XP) perform the following steps:
- Click the Start button, click Settings, and then click Printer and Faxes.
The Printers and Faxes window appears.
- Right-click Dell Laser MFP 1600n, 1815dn, and left-click Printing Preferences.
The Dell Laser MFP 1600n, 1815dn Printing Preferences window appears.
- Click the Advanced button.
The Dell Laser MFP 1600n, 1815dn Advanced Options window appears.
- Click to highlight Toner Save.
- Click the drop-down list and change it to Off and click OK.
- Click OK.
One thing that you mentioned in your post "it takes the printer forever to warm up". The fuser does have to reach operational temperature in order for it to fuse the toner to the page. So it is possible that you are having fuser problems, because of the time it is taking for it to warm up. Another thing that can contribute to the warm up time is not plugging the laser printer directly into a wall outlet. This would be true for any laser printer, not just a Dell laser printer. The low voltage power supply is what works the fuser, along with sensors and other motors in the printer.
Replacing the fuser and or the low voltage power supply in this model of printer is not an easy task. If using a Dell branded toner cartridge and checking the toner saver mode does not fix the issue. Then you would be looking at more expense then the machine would possibly be worth.