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Diagnostics and Maintenance
6-2 C141-E235
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 regarded as success when the
seek operation to the target cylinder is completed.
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 HDD 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 HDD sends the Fault LED Out signal to the
interface connector. In this status, the HDD 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 initiator 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 HDD 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 HDD executes the initial self-diagnosis again.