Digital Equipment DEC 3000 600 AXP, Service Information

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LED Codes
2. Replace the system module.
3. If the error persists, replace the I/O module.
The LED code is 35.
Memory LED
Codes The following LED codes represent continued power-up testing.
If an error occurs during this testing sequence, the system
hexadecimal code plus FRU and error code information appear
on the screen.
If the system enters console mode, then run the MEMORY
diagnostics and interpret the error information using:
• The SHOW ERROR command.
• Diagnostic information (Chapter 9).
The next table lists the LED codes. For each LED code that
appears, take the following action in the order listed.
1. Verify that all memory modules are properly installed.
Reseat the MMBs and SIMMs if necessary.
2. Verify that all power cables are connected correctly.
LED Code Description
20 Machine Check
21 CELL Fill mem with test pattern data
22 CELL Forward Rd/Compare/Complement
/Wr
23 CELL Reverse Rd/Compare/Complement
/Wr
24 ADDR Fill mem with addresses as data
25 ADDR Read/Compare data = address
26-2A Reserved
2B LLSC load-locked/store-conditional tests
2C BCTP Bcache Tag Parity detection
2D ECC Detection
2E Reserved
2F Clear memory to zeros
NVR LED
Codes The following LED codes represent continued power-up testing.
If an error occurs during this testing sequence, a hexadecimal
code plus FRU and error code information appear on the screen.
10–5