71
PSR-S750/PSR-S950
PSR-S750 SYSTEM BOOTING FLOWCHART
A
Power ON
Initializing SWX08 port.
PSWO = H
SWP_IC = H
/ADDAC-PDN = L
MIDI_IC = H
/MUTE = L
/SPOFF = L
/DA-MUTE = L
LCD_BL = H
Setting CPU registers.
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)
LCD_BL = H
Initializing EBUS driver.
(EBUS Start)
/EIC = H
Backup Flash transferred.
ROM SDRAM
(IC21)
Resetting negation.
SWP_IC = L
/ADDAC-PDN = H
MIDI_IC = L
SWP_IC = H
/EIC = L
Keyboard and switch
status taken in.
Initializing EBUS driver.
SWP_IC = L
(EBUS Start)
/EIC = H (IC311, 1)
LCD_BL = H
Communication with
EBUS starts.
Installation screen
displayed.
User specified
installation mode?
Test mode?
No
Yes
Installation
by user
Normal
starting
No
Yes
Accessing Program Flash
(IC22) starts.
Accessing SDRAM (IC11, 12)
starts.
If accessing SDRAM doesn’t
start, SWX08 (IC2) may be faulty.
If failed to reach here,
possible cause may be in;
s3$2!-
If accessing Program Flash
doesn’t start, SWX08(IC2)
may be faulty.
Initializing SDRAM for
BOOT, 0 clear, setting
constant.
END
Error Detect pulse
output (IC500,1)
Test mode displayed.
Opening screen displayed.
END
Summary of Contents for PSR-S750
Page 41: ...41 PSR S750 PSR S950 Pattern side 2NA WZ35370 1 DM Circuit Board PSR S750 ...
Page 43: ...43 PSR S750 PSR S950 Pattern side Scale 90 100 DM Circuit Board PSR S950 2NA WZ49340 1 ...
Page 45: ...45 PSR S750 PSR S950 Scale 90 100 Pattern side AJACK Circuit Board 2NA WZ43510 2 ...
Page 47: ...47 PSR S750 PSR S950 PNM Circuit Board Pattern side Scale 70 100 2NA WZ50830 1 ...
Page 48: ...PSR S750 PSR S950 48 PNS Circuit Board Component side WR 315 1 WR 31 1 WR 310 1 2NA WZ50830 1 ...
Page 49: ...49 PSR S750 PSR S950 Pattern side PNS Circuit Board 2NA WZ50830 1 ...