Abstract: A memory cartridge for use with a printer, a copier, a word processor and other electronic equipment as an external memory. A connector corresponding to that of the equipment is provided on one end of a casing which accommodates a printed circuit board, which is loaded with memory devices. A plurality of memory cartridges may be connected to a buffer of the equipment via the individual connectors. A grounding plate for making contact with a grounding portion of the printed circuit board is disposed on the memory cartridge close to the connector. This reliably connects the memory cartridge to ground. Further, since which one of the memory cartridges is selected can be determined, it is not necessary for the equipment to be provided with buffers and related circuits in one-to-one correspondence to the memory cartridges.

Abstract: A printer has a record unit including a record in the form of an endless belt which moves in one direction, a charger for charging the record, an exposure unit for forming an electrostatic latent image on the charged record, a developing unit for converting the latent image into a visual image, a sheet feeder for feeding a record sheet from a stack, as separated one by one, and feeding it into close contact with the record which carries the visual image, a transfer unit for transferring the visual image from the record onto the record sheet, a fixing unit for fixing the transferred visual image on the record sheet, and a delivery unit of delivering the fixed record sheet out of the printer. As a characteristic of the invention, the record unit and the developer unit are detachably mounted together and capable of being slid out of the printer for servicing.