I changed the black cartridge in my hp 932c and now there is a faint double image of everything in black. I switched cartridges and still have the problem.

The Deskjet 932 has a sensor that allow the printer to perform an automatic calibration whenever a cartridge is changed. It should not be necessary to ever manually force a calibration, but if you want to you can do it from the front panel as follows:

1. Turn on the printer.
2. Press and hold in the power button.
3. While holding the power button in press and release the form feed button three times quickly.
4. Release the power button.

This will print a calibration page which will be scanned automatically as part of the process. The calibration may fail if the 78 cartridge is not properly printing yellow or the 45 is not printing properly. It may also fail if the sensor is fogged with aerosol. This can be resolved by cleaning the sensor with a damp q-tip. The sensor is located in a small black plastic box located in the lower right rear of the carriage.