Yamaha PSR-S750 Service Manual page 68

PSR-S750/PSR-S950
Test No. LCD display
37 037 : USB to Device/Host Check
38 038 : USB Storage Device Check
39 039 : Keyboard Type Check
40 040 : ROM Check2
41 041 : RAM Check2
42 042 : Backup ROM Check2
43 043 : Wave ROM Check2
44 044 : Effect RAM Check2
47 047 : Factory Set
48 048 : Test Exit
68
Test descriptions, judging conditions, etc.
Checking USB Device/Host.
Enter the test with the [START/STOP] button and "Connect Device – Host" will be shown
on the LCD.
Connect the USB cable to [USB TO DEVICE] and [USB TO HOST] terminals and check that
"Device – Host OK" is displayed and the C4 sound is produced.
Checking the USB Storage.
Insert the USB memory and press the [Start/Stop] button.
Check that "USB Storage Device Check OK" is displayed on the LCD.
If no media is inserted, "NO DISK" will be displayed.
If the media is unformatted, "UNFORMAT DISK" will be displayed.
If the media is protected, "PROTECT DISK" will be displayed.
If failed in reading/writing, "NG" will be displayed.
Checking Keyboard Type.
Check that "Keyboard Type Check OK (16M)" is displayed on the LCD.
Checking the ROM connected to the CPU bus and SSP2 bus. (Complete check)
Check that "ROM Check2 OK" is displayed on the LCD.
When the result is NG:
MAIN PROG ROM (IC16) NG
SSP ROM (IC610)
Checking the RAM connected to the CPU bus and SSP2 bus. (Complete check)
Check that "RAM Check2 OK" is displayed on the LCD.
When the result is NG:
MAIN SDRAM (IC204, IC205, IC206, IC207) NG
MAIN SDRAM (IC209)
SSP SDRAM (IC609)
Checking the BACKUP ROM connected to the CPU bus. (Complete check)
Check that "Backup ROM Check2 OK" is displayed on the LCD.
It will take about 5 minutes for the check.
When the result is NG:
BACKUP (IC23)
Checking the WAVE ROM connected to the TG bus. (Complete check)
Check that "Wave ROM Check2 OK" is displayed on the LCD.
It will take about 2 minutes, 14 seconds for the check.
When the result is NG:
Wave1 (IC602, IC606)
Checking the Effect RAM connected to the TG bus. (Complete check)
Check that "Effect RAM Check2 OK" is displayed on LCD.
It will take about 35 seconds for the check.
When the result is NG:
Effect1 (IC613)
If the Factory Set is executed, Internet setup will be lost.
Initializing the entire data to reset to the initial factory setup.
* Only the fl ag for initialization is raised in this stage and the actual initialization will be ex-
ecuted when the power is turned on the next time.
Check that "Factory Set OK" is displayed on LCD.
After executing this Factory Set, make sure to execute the test No. 48 "Test Exit".
Do not turn off the power until the main screen is indicated after turning on the power the next
time.
This will leave the test program and change to the play mode.
Do not turn off the power until the main screen is indicated after executing the
Test Exit.
NG
NG
NG
NG
NG
NG