THINKJET PRINTER (HP MODEL 22256)

Section III. Technical Principles of Operation of BECS Components

TM-11-5895-1412-12P Basic Generation Unit AN/GYK-33 (NSN 5895-01-260-4545) (EIC:N/A) Manual
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TM 11-5895-1412-12&P The disc drive reads and writes data to and from the disc using a window space which exposes the disc. This window is covered by a metal shutter. The shutter helps protect the disc surface from particles and accidental fingerprints. The disc drive is equipped with a shutter opener. This means that when the disc is placed in the drive, the shutter is automatically opened exposing the disc surfaces. The power light on the front panel flashes whenever it’s time to charge the battery. When there is a low battery indication, the battery provides a reserve operating time of about five minutes, or a standby time of about thirty minutes. After the battery voltage drops below a minimum, the drive will not respond to read or write operations. This is to protect the stored data. The adapter/recharger can be connected to the disc drive at any time. The disc drive can be used while the battery pack is charging. In fact, it is recommended that the adapter/recharger be used whenever possible, even when the battery is fully charged. A power-on self-test is performed automatically when the disc drive is turned on. The fault light is the self-test indication. This light is on when self-test is in operation. The self-test takes approximately 6 (or 11) seconds after which the fault light goes out. If the fault light stays on after the normal testing time, an error within the disc drive has been detected. The read/write heads of the disc drive touch the disc. As a result, the flexible disc media does wear. Through a feature called Media Monitor, the disc drive automatically monitors the cumulative use of each individual disc. When the usage of a disc is approaching a level at which there is a risk of loss of data through normal disc wear, the disc access light on the front panel blinks and a clicking sound is heard. THINKJET PRINTER (HP MODEL 22256) The ThinkJet Printer (HP-2225B) is a battery powered, lightweight page printer which can be easily transported anywhere. This printer is small and has a print rate of 150 characters per second (cps). The printer is powered by a rechargeable 6.5V nickel cadmium (NiCad) battery. The printer also has a low battery indication; printer stops operating at 6.2V. A major feature of the ThinkJet printer is the quietness of its ink jet printing. The ink jet print head cartridge contains ink to print approximately 500 pages. The cartridge is completely disposable and easy to replace. Normal line length is 80 characters, with a paper width of 8.65” and a paper length of 11”. The printer can use either single sheet paper (ink jet recommended), or Z-fold pin feed paper. The ThinkJet printer is capable of printing in two modes, text mode and graphics mode. In text mode, the printer interprets each data byte it receives from the computer as an ASCII character. It then looks that character up in its internal character table and prints the dot pattern which it finds. In graphics directly specifies the mode, however, the data received from the” computer dot pattern which is to be printed. 1-20

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