TM 11-6625-3081-231-21. ELECTRONIC STATION (cont)1-21(c) The parallel data is transferred to the IEEE 488 bus interface where astatus check is performed, the handshake sequence between extenders is performed,and the data frame is put onto the IEEE 488 bus.(3) TransmitMode.After the receive data frame has been accepted and thehandshake sequence completed, the HP-IB extender assembles a return frame. Thereturn frame is passed to the 16-bit data register, clocked into the encoder,encoded into a transmit data frame, and transmitted over coaxial cable by thetransmit driver.i.DISC/TAPE DRIVE ASSEMBLY 1A1O(1) Disc/tape drive assembly 1A1O (Hewlett Packard HP7914R) consists of achassis assembly, tape drive assembly, disc drive assembly, power supply assembly,and CCA card cage.(2) The disc drive is a medium performance, random access, data storage devicewith a formatted storage capacity of 132.1 megabytes.The disc module includes anelectromagnetic rotary head positioning system, spindle, spindle and blower motor,air filtration and cooling system, and-associated electronic components.(3) The power supply is mounted to the rear and contains a transformer, filtercapacitors,ac input circuitry, fuses, and power regulator.(4) The cartridge tape unit uses a preformatted data cartridge. Data is loadedonto the disc drive via the cartridge tape unit.Also data copies can be made byloading data from the disc drive onto a cartridge tape.(5) The CCA card cage is located and accessible from the front of the chassisassembly.CCAs are located in slots and provide for tape control, disc control, andHPIB interface bus.(6) Internal diagnostics are used to detect and isolate malfunctions within thedisc/tape drive assembly.These diagnostics are automatically performed duringpower-up, while the drive is idle, or when manually initiated. The diagnosticprogram is resident in the microprocessor CCA.1-136Change 5
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