Digital Equipment DEC 3000 600 AXP, Service Information

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LED Codes
LED Codes
Serial ROM
LED Codes The system displays a series of hexadecimal codes at the
beginning of the power-up test. The codes, the corresponding test
description, and possible reasons for a test failure are described
in Table 14–1.
Note
See Table 5–2 for a list of the LED displays and
corresponding hex codes for the DEC 3000 Model 600
/600S AXP system.
Table 14–1 Power-Up Test Serial ROM Codes
LED
Code
Test Description Reason for Failure
FF Set all 8 Multiplexer Control
Registers (MCRs) to 128M. MCR did not read back as expected
(fatal error, branches to SROM
miniconsole).
FE Mapping out an MCR per
macrocoders manual (only appears if
an error occurs). MCR did not read back as expected
(fatal error, branches to SROM
miniconsole).
FD Memory sizing completed. All MCRs mapped out (no memory
detected - fatal error, branches to
SROM miniconsole).
FC Mapping an MCR. Only MCR did not read back as
expected (fatal error, branches to
SROM miniconsole).
FB Memory configuration completed. Should never stop here.
FA Memory test with non-BCACHE bit
SET, Dcache OFF, and mchk enabled If read as .NE. write, send error dump
to SROM port and branch to SROM
miniconsole.
(continued on next page)
14–2