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?
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?
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?
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