Psr-S750 System Booting Flowchart - Yamaha PSR-S750 Service Manual

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PSR-S750 SYSTEM BOOTING FLOWCHART

Power ON
Accessing Program Flash
(IC22) starts.
Setting CPU registers.
Initializing SDRAM for
BOOT, 0 clear, setting
Accessing SDRAM (IC11, 12)
constant.
starts.
Initializing SWX08 port.
PSWO = H (CN503, 1)
SWP_IC = H (IC306, 1)
/ADDAC-PDN = L (IC510, 13)
MIDI_IC = H (IC306, 6)
/MUTE = L (IC503, 1)
/SPOFF = L (IC503, 9)
/DA-MUTE = L (IC2, V2)
LCD_BL = L (TR2, 2)
Initializing EBUS driver.
SWP_IC = L
Communication with
EBUS starts.
(EBUS Start)
/EIC = H (IC311, 1)
Keyboard and switch
status taken in.
SWP_IC = H
/EIC = L
Yes
User specified
installation mode?
No
Installation screen
Normal
starting
LCD_BL = H
If accessing Program Flash
doesn't start, SWX08(IC2)
may be faulty.
If accessing SDRAM doesn't
start, SWX08 (IC2) may be faulty.
displayed.
END
Installation
by user
Initializing SWX08 port.
PSWO = H
SWP_IC = H
/ADDAC-PDN = L
MIDI_IC = H
/MUTE = L
/SPOFF = L
/DA-MUTE = L
LCD_BL = H
Opening screen displayed.
LCD_BL = H
If failed to reach here,
possible cause may be in;
Resetting negation.
SWP_IC = L
/ADDAC-PDN = H
MIDI_IC = L
Initializing EBUS driver.
(EBUS Start)
/EIC = H
Backup Flash transferred.
ROM
SDRAM
(IC21)
Yes
Test mode?
No
Error Detect pulse
output (IC500,1)
Test mode displayed.
PSR-S750/PSR-S950
END
A
71

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