Yamaha PSR-S650, Service Manual

Page: 45 / 70

45
PSR-S650
Meaning of marks
Normal Process
Description of
NG judgment
Description of
operation
Possible causes when not
displayed:
• LCDC (IC7) defective
• CN2 disconnected
• LCD module defective
Possible causes when not executed
up to here:
• PROGRAM ROM (IC8) defective
• SDRAM (IC5) defective
Judgment
Port initial setting
EICN = L (IC3, D12)
Peripherals reset cancellation
/LCD_IC = H (IC1, 7)
Opening screen display
/LCD_OFF = H (IC1, 5)
Peripherals reset cancellation
/MKS-IC = H (IC3, W8)
Peripherals reset cancellation
/DAC-IC = H (IC1, 2)
BACK-UP FLASH (IC9)
initialization
BACK-UP FLASH (IC9)
write protect cancellation
/WP-BKUPn = L (IC3, P1)
MKS ACK transmission
TXD1 = L (IC3, B6)
TXD1 = H (IC3, B6)
EBUS driver initialization
(EBUS Start)
EICN = H (IC3, D12)
EBUS driver initialization
(EBUS Start)
EICN = H (IC3, D12)
EICN = L (IC3, D12)
TxD0 = H (IC3, B7)
TxD1 = H (IC3, B6)
Main program
voice parameter
transmission to SDRAM
Various CPU register settings
SDRAM initialization
SWX port initialization
/MKS-IC = L (IC3, W8)
/WP-WAVEn = L (IC3, P3)
/WP-PRGn = L (IC3, P2)
/WP-BKUPn = L (IC3, P1)
PSWO = H (IC3, N4)
/DAC-IC = L (IC1, 2)
Power On
Access to IC8 starts
Access to IC7 starts
Access to IC5 starts
Access to IC9 starts
Communication using RXD1, SCK1,
TXD1 starts
Communication with EBUS
starts
Clock output from SYSCLK
(IC3,Y12) starts
Opening screen display
Main screen display
Test mode?
YES
NO
“Test Mode” display
After Factory Set
execution
YES
NO
“Clearing All Memory…” display
Backup Clear start
YES
NO
“Clearing Backup…” display
Flash Clear start
YES
NO
“Clearing Flash…” display
Expansion data
illegality
YES
NO
“Clearing Expansion Data…”
display
Indication
When this display appears
every time:
• BACK-UP FLASH (IC9)
defective
When this display appears
every time:
• BACK-UP FLASH (IC9)
defective
When this display appears
every time:
• BACK-UP FLASH (IC9)
defective
When this display appears
every time:
• BACK-UP FLASH (IC9)
defective
SYSTEM BOOTING FLOWCHART