| 摘要 |
PURPOSE:To improve the reliability for the diagnosis for loop write/read and to troubleshoot a failure earlier, by converting a write data into an AC waveform equivalent to the output from a reading head and transmitting the data to a read amplifier. CONSTITUTION:A magnetic tape unit has a loop write/read (LWR) diagnostic circuit 7 and a conversion circuit 8, a diagnostic LWR data is inputted to the conversion circuit 8 via a control circuit 6 and a write amplifier 4 from the circuit 7 and converted into a waveform equivalent to an analog output from a read head 2 and inputted to a preamplifier 9. The LWR data is given to the control circuit 6 and the LWR diagnostic circuit 7 via a main amplifier 10 and a comparator 11 the same as reading operation as normal. The LWR diagnostic circuit 7 compares the transmitted LWR with the received data for check, allowing to diagnose the normality of a data transfer bus system. |
