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M2266S/H
Technical Handbook
The items that follow briefly describe the diagnostic functions.
a. Hardware Function Test
This test checks the basic operation of the controller and contains the
following tests:
• EPROM where 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 by confirming the physical address
information . The test reads the ID field from the data block on track 0
of the target cylinder after completion of the seek operation to the target
cylinder.
c. Write/Read Test
This test checks the write/read function, using the CE space of the disk
drive. It runs two types of diagnostic patterns: repeating
X'BBBA645A27BB', and repeating X'OO'. After writing the diagnostic
pattern into all logical data blocks in the CE space, the test reads the data
block and then compares the data pattern to confirm that writing and
reading operations are valid.
Initial Self-Diagnostics
When power is turned on, the initial self-diagnostics run on the IDD. These
diagnostics check the basic operation of the hardware functions. If an error is
detected, the LED on the drive front panel blinks.
Offline Self-Diagnostics (Setting Terminal)
When the diagnostic mode is set on the terminal CN3/CN9 (by setting the
plug between pins 1 and 2 open), the IDD executes the hardware function
test, seek (positioning) test and the data write/read test of the CE space as self
diagnostics.
Fujitsu America, Inc.
FS810125-01 . . . A
6-3
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