M800/M80/E80 Series Maintenance Manual
1 System Basic Configuration
31
IB-1501273-F
1.4.6 7-segment LEDs on the Control Unit
The 7-segment LEDs mounted on the control unit can display NC status.
When alarms occur, an alarm with the highest priority within each part system is displayed.
1.4.6.1 Normal State Display
In normal state, the 7-segment LEDs display
in flashing.
1.4.6.2 Error Display at NC Startup
If an error occurs at NC start up, the 7-segment LEDs change as follows.
The state of sub CPU (NCLD2) is displayed on the left and that of the main CPU (NCLD1) is displayed on the right by two
7-segment LEDs.
Take a note of the displayed contents and contact the Service Center.
(cf) In case of SRAM clear, the 7-segment LEDs change as follows. (RSW2: "C")
NCLD2
NCLD1
Main CPU
Sub CPU
LED display
Cause
E
Undefined interruption occurred
F
Bus error, address error or interrupt exception (ASIC)
d
Memory test error in DRAM
U
Unsupported H/W
A
CRC check error occurred (Boot ROM, FROM entry, OS, EEPROM)
C
Sequence error occurred at OS startup
G
Initialization error in graphic controller
. (Period)
No correct boot data in flash ROM
LED display
Cause
y
Memory test pass in SRAM
c
Memory test error in SRAM
Содержание E80 Series
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