Yamaha DTXPRESS IV Service Manual page 21

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3 7 63 1515 0
[Test code]
03
[Initial indication]
3 SRAM
[Test content]
Write/read the data "AA" and "55"in the SRAM area and verify
them.
[Test method]
Press the [SAVE/ENTER] key to execute the test.
Execute the C-02. FLASH test and if its result is OK, the test is
started automatically.
[Check item]
Check the LCD test result.
(When the result is OK, testing proceeds to the next test and
remains in the standby mode.)
[Indication of judgment result]
When the result is OK
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C-04. MIDI test is started automatically.
When the result is NG
3 SRAM
[Content of FAIL judgment]
None
[MIDI code output of judgment result]
OK A0 03 02
FAIL A0 03 03
[Completing the test]
When the result is OK, testing proceeds to the next test.
For the procedure when the test is judged as FAIL before its
completion, refer to "B. Carrying on the test"
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C-03. SRAM
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8
[Test code]
04
[Initial indication]
[Test content]
Output key on (90 3C 7F) from MIDI OUT. After 500msec.,
output key off (90 3C 00).
[Test method]
After connecting MIDI OUT to the device capable of displaying
MIDI data with the MIDI cable, press the [SAVE/ENTER] key
to execute the test.
[Check item]
Check that [90 3C 7F] and [90 3C 00] are output from MIDI
OUT.
[Indication of judgment result]
None
Q Q
3 6 7 1 3
[Contents of FAIL judgment]
None
[MIDI code output of judgment result]
A0 04 01
(This code is output after the test data is transmitted.)
[Completing the test]
When the result is OK and indication is provided as shown above,
press the [SAVE/ENTER] key, and [A0 04 02] is output from
MIDI OUT and testing proceeds to the next test.
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2 9 9 4 2 8
C-04. MIDI
4 MIDI
1 5 0 5 8 2 9 9 4
4 MIDI
[ENTER]
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DTXPRESS
9 9
2 8 9 9
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