Yamaha DA824, Service Manual

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3. Automatic inspection
Use the keyboard for the PC to enter "test" and execute program
The following items will be inspected automatically. At the end, a list of items determined to be NG (no good) will be displayed on
the screen.
<Inspection items (test)>
1. SRAM (IC926, IC927) CPU connection check
2. SLOT CPU
3. SLOT clock relationship connection check
4. SLOT power supply peripheral check
5. WORD CLOCK IN terminal/JK901
CPU connection check
If the four items shown above are OK,
appears on the screen and the program ends. If one of the items is NG,
appears and the error list is shown.
[ERROR LIST]
[1] SRAM DATA BUS XXXX XXXX XXXX XXXX
SRAM ADDR BUS XXXX XXXX XXXX XXX
Results of SRAM (IC926, IC927) and CPU connection check
The first line on the screen shows the condition at the address bus from the left A15, A14 . . . A2, A1 (as viewed from the CPU)
The second line on the screen shows the condition at the data bus from the left D15, D14. . . . D1, D0.
[2] SLOT DATA BUS XXXX XXXX XXXX XXXX
SLOT ADDR BUS XXX XXXX XXX
SLOT CONTROL XXXX
SLOT and CPU connection check
The first line on the screen shows the condition at the data bus from the left D15, D14. . . . D1, D0.
The second line on the screen shows the condition at the address bus from the left A15, A14 . . . A2, A1.
The third line on the screen shown the condition at other control lines from the left /CON-MY,/IRQ-MY, RX-MY, TX-MY.
For each item, an “0” is used to indicate normal and “X” is used to indicate an abnormality.
[3] SLOT CLOCK XXX XXXX
Connection check of slot clock line
The condition is shown from the left as 256FS-MY, 128FS-MY, 64FS-MY, SYNC-MY, FS-MY, WCLK-MY.
For each item, an “0” is used to indicate normal and “X” is used to indicate an abnormality.
[4] SLOT +20D
SLOT +5D
SLOT -5A
SLOT +5A
SLOT -15A
SLOT +15A
DA824
30
DA824_DIAG>test
DIAGNOSIS RESULT OK
DA824_DIAG>
DIAGNOSIS RESULT NG
ERROR LIST
[2] SLOT DATA BUS
XXXX XXXX XXXX XXXX
SLOT ADDR BUS XXX XXXX XXX
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