Yamaha Tyros3 Service Manual page 108

Tyros3
Test 51
Function: Full check of RAM
(This is a test for factory inspection)
Description:
Executes Read/Write test (connection check) of RAM.
Displayed Message:
０５１：ＲＡＭ Ｃｈｅｃｋ２
０５１：ＲＡＭ Ｃｈｅｃｋ２
ＯＫ
０５１：ＲＡＭ Ｃｈｅｃｋ２
Ｍａｉｎ ＳＤＲＡＭ ＮＧ
Ｓｕｂ ＳＤＲＡＭ ＮＧ
Supplement:
Location of NG will be shown in case of NG.
If sound board is not recognized, "No Card" will be shown
for SUB SDRAM.
Circuit
Error Indications Board Location
Main SDRAM NG DM
Sub SDRAM NG
DM
Sub SDRAM No Card
108
Selected screen
In case of OK
In case of NG
Name in Circuit Diagram
IC12 SDRAM 256 M
IC13 SDRAM 256 M
IC513 MAIN RAM 128 M SDRAM
Test 52
Function: Full check of backup ROM
(This is a test for factory inspection)
Description:
Executes Read/Write test of the entire blocks of Backup Flash
ROM.
It will take about 4 minutes for the check.
Displayed Message:
０５２：ＢＡＣＫＵＰ ＲＯＭ Ｃｈｅｃｋ２
０５２：ＢＡＣＫＵＰ ＲＯＭ Ｃｈｅｃｋ２
ＯＫ
０５２：ＢＡＣＫＵＰ ＲＯＭ Ｃｈｅｃｋ２
ＮＧ
Supplement:
The check cannot be aborted until OK/NG result is indicated.
Original data will be written back after the test is executed.
Do not turn off the power during checking or the data will be
lost.
Circuit
Error Indications Board Location
NG DM
Selected screen
In case of OK
In case of NG
Name in Circuit Diagram
IC15 BACKUP 64 M FLASH