Kurzweil K2000 Service Manual page 64

SECTION 4
4.14.7 Audio Board Test
Another I/O test, this checks the connections between the engine and audio
boards. When you run this test, the LCD will always display "Success," but
this should be ignored, since it doesn't indicate the success or failure of
the test. In a successful test, the eight LEDs to the left of the LCD will
flash in sequence (from top left to bottom left to top right to bottom right)
at 300 rns intervals. A failure of any of the LEDs to light indicates a
defective LED or a faulty connection between the engine and audio boards.
4.14.8 MIDI UART Test
This I/O test checks the operation of the MIDI In and Out ports. Before
executing this test, connect a MIDI cable from the K2000's MIDI Out port to
its MIDI In port. A failure of this test is indicated in the display as a
data failure as described in the overview. If this test fails, repeat the
test with a different cable. If it still fails, this indicates that one or
more pins in the MIDI Out and/or MIDI In port is defective.
4.14.9 FDC Test
A
b~ank formatted f~oppy disk (DOS 1.
-1M)
must be inserted in the f~oppy disk
drive before initiatinq this test. The test cannot proceed without a disk
inserted in the drive.
The FDC (floppy disk controller) test is an I/O test, and checks the
functionality of the NEC PD72064 chip, the floppy disk drive, and their
connections. The test entails sending a test data pattern from the floppy
disk controller (FDC) to the floppy disk drive (FDD) and back. If the
display indicates a successful test, then the connections between the FDC and
FDD are functioning, and the test data pattern written by the FDC and read
from the FDD are identical. If the display indicates "Read Fail," there is a
problem in the connection from the FDC to the FDD. If it indicates "Write
Fail," there is a problem in the connection from the FDD to the FDC. If the
display indicates "Data Fail," the read and write operations are normal, but
the "read" signal and the "write" signal do not match. In this case, the
display will indicate a data failure as described in the overview.
4.14.10 SCSI Test
This I/O test is similar to the FDC test, and checks the functionality of the
SCSI port. If no SCSI device is connected to the unit's SCSI port, this test
will fail. This does not necessarily indicate a malfunction of the SCSI
link. To be sure that the SCSI link is operational, you should connect a
SCSI device before running this test.
4.14.11
Swap Bit Test
The 68301 processor's 16 megabits of address space are divided into 16 equal
memory blocks, numbered 0-15. The first time the K2000 is powered up, Block
o
processes data for the Boot EPROM and Setup EPROM, while Block 1 processes
data for the PSRAM. Many of the K2000's basic functions utilize the PSRAM,
which accesses the higher address space of Block 1 in the
cpu.
This slows
down the access time somewhat, since the address space of the CPU is accessed
in sequence, beginning with Block
O.
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