
B-63322EN-1/01 12. MAINTENANCE
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Table 12.1.2 (b) LED (red) indications and their meanings (ALARM LED)
No. LED (red) indication Meaning
A This board is reset.
It is not activated by the main CPU.
B L-BUS bus error
An error occurred inside this printed circuit board.
The printed circuit board must be replaced.
C DRAM parity error
An error occurred in the DRAM module mounted in this printed circuit board.
Replace the DRAM module.
: On : Off
Table 12.1.2 (c) System error messages
Code Message Description
1 DRAM CHECK SUM ERROR The results of the parity check could not be accepted upon
loading into the code area.
4 HARD ERROR The printed circuit board must be replaced.
5 UNDEF IRT 00nn(aaaaaaaa) ERR-CODE:cccc An illegal interrupt was generated.
00nn: Type of the generated interrupt
cccc: Error code
6 F-BUS ERROR(aaaaaaaa) When the R.B. board is the F-BUS bus master, a cycle
results in a bus error.
7 DRAM PARITY 000n(aaaaaaaa) A parity error occurred in DRAM.
000n: Byte train in which the error occurred
8 BUS ERROR(ARES) (aaaaaaaa) When the ARES is the L-BUS bus master, a cycle results
in a bus error.
9 BUS ERROR(LFP) (aaaaaaaa) When the LFP is the L-BUS bus master, a cycle results in
a bus error.
A WRITE BUS ERROR(F-BUS) (aaaaaaaa) When F-BUS is the L-BUS bus master, a write cycle
results in a bus error.
B WRITE BUS ERROR(aaaaaaaa) When a device other than the F-BUS is the L-BUS bus
master, a write cycle results in a bus error.
* aaaaaaaa is the execution address (next instruction) at the time
the error occurs.
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