Yamaha spx2000 Service Manual page 38

SPX2000
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5. MIDI test
The character string "SCI2: TEST¥n" (¥n=0Ah) is sent
from MIDI OUT to MIDI IN at 31.25 Kbps to check if
the sent string and the received one are identical.
Preparation
Connect the MIDI OUT and MIDI IN connectors of the
main unit.
Example of execution screen
MIDI
If no signal is received, "NG" is displayed in about 2
seconds.
When testing starts, "testing..." appears on the screen.
"OK" is displayed when the MIDI test ends with a
satisfactory result and "NG" when it ends with an
abnormality detected.
Caution
Cancellation of the test is invalid while it is being
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executed.
6. USB MIDI test
After initialization of the USB, it is checked automatically
using the loopback of the USB connected PC.
Preparation
Using the general purpose USB cable, connect the USB
connector of the main unit and the PC.
Make USB-MIDI driver settings on the PC. (Thru On)
Example of execution screen
USB MID
If no signal is received, "NG" is displayed after about
10 seconds. (The waiting time is set longer than that for
the MIDI test because USB response may be slower
depending on PCs.)
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When testing starts, "testing..." appears on the screen.
.
"OK" is displayed when the MIDI test ends with a
satisfactory result and "NG" when it ends with an
abnormality detected.
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OK
OK
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Caution
Cancellation of this test is invalid while it is being
executed.
7. AES/EBU IN/OUT (DIO) test
AES/EBU OUT DIGITAL
is checked by using SIO of DSP.
Preparation
Connect AES/EBU OUT DIGITAL and AES/EBU IN
DIGITAL of the main unit.
Example of execution screen
AES/EBU IN/OUT
When testing starts, "testing..." appears on the screen.
When "DIO disconnect!" is displayed, disconnect the
AES/EBU signal which is connected IN -> OUT.
When preparation is completed, press the [NEXT]
switch. To cancel this test in this stage, press either
[UNDO] or [BACK] switch.
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When the [NEXT] switch is pressed, testing starts again
and "testing..." appears on the screen.
"OK" is displayed when the DIO test ends with a
satisfactory result and "NG" when it ends with an
abnormality detected.
Caution
1) DIR Lock flag is read by Gate Array (and checked after
waiting for about 100mS after star ting SIO
transmission/reception).
2) DIT, DIR, CDIN, CDOUT are read and written to check
RUN bit (0 x 40 of Reg4)
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2 9 9 4 2 8
AES/EBU IN DIGITAL
OK
1 5 0 5 8 2 9 9 4
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9 9
2 8 9 9