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Diagnostics and Maintenance
6-2 C141-E198
Brief test contents of self-diagnostics are as follows.
a. Hardware function test
This test checks the basic operation of the controller section, and contains following test.
• RAM (microcode is stored)
• Peripheral circuits of microprocessor (MPU)
• Memory (RAM)
• Data buffer
b. Seek test
This test checks the positioning operation of the disk drive using several seek modes (2 points
seek, 1 position sequential seek, etc.). The positioning operation is checked with confirming the
physical address information by reading the ID field (LBA) from the data block on track 0 after
completion of the seek operation to the target cylinder.
c. Write/read test
This test checks the write/read function by using the Internal test space of the disk drive.
(1) Initial self-diagnostics
When power is turned on, the IDD starts initial self-diagnostics. The initial self-diagnostics checks
the basic operations of the hardware functions.
If an error is detected in the initial self-diagnostics, the IDD sends the Fault LED Out signal to the
interface connector. In this status, the IDD posts the CHECK CONDITION status to all I/O
operation requests other than the REQUEST SENSE command. When the CHECK CONDITION
status is posted, the INIT should issue the REQUEST SENSE command. The sense data obtained
with the REQUEST SENSE command details the error information detected with the initial self-
diagnostics.
Even if CHECK CONDITION status and sense data are posted, the IDD continues sending the Fault
LED Out signal to the interface connector. Only when the power is turned off or re-turned on, this
status can be cleared. When this status is cleared, the IDD executes the initial self-diagnosis again.