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115 vac is being supplied to my printer. However nothing happens when I push the front panel button. No indicator lights are lit. Is there an internal fuse that I could check? Is it easy to open the housing to inspect the internal circuitry?

Actually the toner cartridge was originally purchased as a replacement HP OEM. However I had replenished the toner (via a toner kit) at least once. I did cleaned the opc drum, as you call it, very carefully but did note that while rotating it by hand, it continued to "pick up" toner in the same...

Replaced toner cartridge with a new HP OEM one bought on eBay. Printed copy is now perfect. Thanks to all for your advice.

The toner cartridge for my HP 4L has HP P/N 92274A. Will the FX2 for Canon copiers be an exact replacement? Also what is the typical shelf life of a manufactured cartridge?

Thanks for the feedback! I opened the shutter on the toner cartridge & inspected the light blue/green roller (transfer roller?). There is a band of toner corresponding to the vertical band appearing on my printed copies. Using a q-tip I attempted to remove the band on the roller while rotating...

I have been using an HP Laserjet 4L (C2003A) sparingly for ten years. The printing is still excellent but I'm now getting a vertical grey band from the left edge of the printed copy measuring about 5/8" wide. Can anyone suggest instructions/procedures for eliminating this banding?