cartridge
Leave the dummy cartridge in place
If you purchase an option cartridge containing a program or a microcassette recorder, then you will need to remove the dummy cartridge in order to insert the option cartridge. But until then, please leave the dummy cartridge in place.
When no cartridge is in place, one of the HX-20’s connectors is exposed. Static electricity or metal objects contacting this connector can damage the HX-20’s circuitry. By covering up this connector, the dummy cartridge prevents such mishaps.
Do not remove the system bus coverOn the left side of your HX-20, you will notice a small strip of dark plastic. This covers up a connector called the system bus.
system bus cover
Do not remove the system bus cover
When the system bus is exposed, you will run the risk of damaging your HX-20 through exposure to static electricity, metal objects, and other hazards. The system bus cover protects your HX-20. Carefully remove it only to install the HX-20 expansion unit.