An image forming apparatus includes a main assembly; a cartridge detachably mountable to the main assembly; a fixing unit detachably mountable to the main assembly; and an opening of the main assembly. A method for fabricating an electronic assembly utilizes at least one operation in which a thermally expansive substance, such as a volatile organic compound, is applied to the PCB. The structure discussed above allows the adjusting section to adjust frequency characteristics corresponding to the antenna element to desirable ones with ease, so that a basic tooling die can be commonly used and standardized antenna device is obtainable with ease. Outer substrates are disposed at outer sides of the cell units, each of the substrates having through holes formed therein to define at least one oxygen supply for supplying oxygen to the electrolyte layers of the cell units. An installing section installs the driver software into the information processing apparatus, the driver software containing the information for the desired image recording apparatus. When the transmitting amplifier temperature becomes below a second temperature that is lower than the first temperature, the communication speed is switched back to the high level to resume transmission of both voice and image data.