Yamaha Tyros4, Service Manual

Page: 69 / 173

69
Tyros4
Test 3
Function: Simpli fi ed check of ROM
Description:
Executes Read test (checksum test) of ROM.
Executes Write pin check of Program Flash ROM as well.
Displayed Message:
００３：ＲＯＭ Ｃｈｅｃｋ１
Selected screen
００３：ＲＯＭ Ｃｈｅｃｋ１
ＯＫ
In case of OK
００３：ＲＯＭ Ｃｈｅｃｋ１
ＭＡＩＮ ＰＲＯＧ ＲＯＭ （ＩＣ１６ ） ＮＧ
ＭＡＩＮ ＤＡＴＡ ＲＯＭ （ＩＣ１９ ） ＮＧ
ＳＳＰ１ ＰＲＯＧ ＲＯＭ （ＩＣ９０４） ＮＧ
ＭＡＩＮ ＰＲＯＧ ＷＲ （ＩＣ１６ ） ＮＧ
In case of NG (Example)
Supplement:
In case of NG, the location and the IC number of which NG is
detected will be shown.
"No Dev."
will be shown if SSP1 PROG is not detected.
Error Indications
Circuit
Board
Location Name in Circuit Diagram
MAIN PROG ROM NG
DM IC16 FLASH ROM 256 M PROGRAM
MAIN PROG WR NG
MAIN DATA ROM NG
DM IC19 FLASH ROM 512 M DATA
SSP1 PROG ROM NG
DM IC904 FLASH ROM 16 M SSP1-PROGRAM
SSP1 PROG ROM No Dev.
Test 4
Function: Simpli fi ed check of RAM
Description:
Executes Read/Write test (connection check) of RAM.
Displayed Message:
００４：ＲＡＭ Ｃｈｅｃｋ１
Selected screen
００４：ＲＡＭ Ｃｈｅｃｋ１
ＯＫ
In case of OK
００４：ＲＡＭ Ｃｈｅｃｋ１
ＭＡＩＮ ＳＤＲＡＭ （ＩＣ２０１．
２０２． ２０３． ２０４） ＮＧ
ＳＳＰ１ ＳＲＡＭ （ＩＣ９０５） ＮＧ
In case of NG
Supplement:
In case of NG, the location and the IC number of which NG is
detected will be shown.
If sound board is not recognized,
"No Dev." will be shown
for SSP1 SRAM.
Error Indications
Circuit
Board
Location Name in Circuit Diagram
MAIN SDRAM NG DM
IC201
-204
SDRAM 128 M
SDRAM 128 M
SSP1 SRAM NG
DM IC905 SRAM 4 M
SSP1 SRAM No Dev.