Yamaha AD824, Service Manual

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AD824
40
When in the test program execution, select the test program number for the gain encoder and the program can be executed each time
the [+48V] key is pressed.
During selection, the number will flash on the 7segLED and will change to steady on when the program is completed.
The following is the list.
[d00] Automatic inspection
[d01] LED inspection
[d02] SWITCH inspection
[d03] to [d07] is reserve.
[d08] displays the program version. (There is no need to execute during inspection.)
[d09]
Initializes memory
[d10] System reset
3. [d00] Automatic inspection
Select the test program number [d00] with the gain encoder. The inspection will be automatically executed when the [+48V] key is
pressed. Or, it can also be executed by entering
<Inspection items (test)>
1. SRAM CPU connection check
2. SLOT CPU connection check
3. SLOT clock relationship connection check
4. SLOT power supply peripheral check
5. COM RS422 terminals/ CN903 connection check
6. WORD CLOCK IN/OUT terminal connection check
During the program execution, [d-] will appear on the 7segLED.
The condition will also appear on the terminal software as shown below.
If the inspection ends normally, the following will appear on the terminal software.
[d00] will also come on 7segLED.
If there is an error, the error list will appear on the terminal software
After [E003] has flashed three times on the 7segLED, [d00] will be displayed steadily.
[ERROR LIST]
[1] SRAM DATA BUS XXXX XXXX XXXX XXXX
SRAM ADDR BUS XXXX XXXX XXXX XXX
Results of SRAM (IC923, IC924) 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
AD824_DIAG>d00
DIAG[00] AUTO CHECK RESULT OK
AD824_DIAG>
Check SRAM DATA OOOO OOOO OOOO OOOO OK
Check SRAM ADDR OOOO OOOO OOOO OOO OK
:
:
DIAG[00] AUTOCHECK RESULT NG
ERROR LIST
[6]
COM B