Yamaha DME4io-ES Service Manual page 118

DME4io-ES/DME8i-ES/DME8o-ES
SYSTEM FLOW CHART (DME Ver. 3)
Purpose
DME Satellite is provided with the test program for diagnosing the hardware.
However, when the test program can not be activated, the troubleshooting is hard.
The system fl ow chart shows the software's action fl ow after releasing reset and may help you to troubleshoot.
CPU data processing sequence
Power ON (reset)
Release CPU Reset
(Action starts in Flash ROM)
SDRAM initialization
Send Boot and Program to
SDRAM
Boot starts in SDRAM
Internal/external devices INITIALIZE
and Initialization display
[x ¯
DIP Switch setting
DIP Switch check
Sum error
Program sum check
Program starts
Internal/external device
reinitialize and display
Measuring battery voltage
[x
DIP Switch setting
[x
DIP Switch check
Start-up sequence end
After this, proceed to scene
recall and network setting
Checking CobraNet/EtherSound
Module
118
All the LEDs will light for 2
seconds.
Then, only the [POWER]
LED will light.
¯ ¯ ]
Test program
¯ ¯
[NETWORK] LED will light.
mode
[ERROR] LED will light.
Download
[SIGNAL 2] LED will blink.
mode
All the LEDs will light for 2
seconds.
Then, only the [POWER]
LED will light.
¯ ¯ ¯ ]
¯ ¯
¯ ¯ ¯ ]
The [PEAK] LED at the top will
Execute
¯ ¯
light when the initialization is in
initialization
progress.
Returns to normal LED
display
[ERROR] LED will light.
System error
[SIGNAL 1] LED will blink.
indication
LED display
State
H
L
H
L
H<–>L
CPU PTJ [7] (186 pin output)
Description Cause of stop
H by CPU internal
pull-up resister.
Sets L when initializing • Can not release CPU
CPU port. Reset.
• Can not access to
FLASH ROM.
Changes to H before FLASH ROM defect,
SDRAM defect
initializing external device.
Changes to L after starting External device defect
task data processing.
(Then, all the LEDs
will light.)
Changes H/L every
500 msec.