Technical data

CHALLENGE/Onyx Diagnostic Road Map 2-27
MC3 Memory Board Error Messages
+ MC3 in slot 3
+ MA Ebus Error register: 0xf
+ My EBus Address Error 3 destination board detected
a parity error in MA emitted
read-response ? field
+ My EBus Data Error 3 one or more boards detected
a parity error in MD emitted
read-response data
+ EBus Address Error 3 this MA detected another
board emitted an address with
bad parity
+ EBus Data Error 1 this MD received data with
bad parity
+ MA Leaf 0 Error Status Register: 0xf
+ Multiple Occurence of these errors: Shows more than one Read
Single Bit Error occurred
+ Read Single Bit Error 2 correctable error in this
leaf
+ Read Uncorrectable Error 2 uncorrectable error in this
leaf
+ PartialWrite Uncorrectable Error 2 uncorrectable error upon
reading out this leaf, to do
a partial write merge
+ MA Leaf 1 Error Status Register: 0xf
2.5 Troubleshooting
This section groups various troubleshooting/debugging tips. Some of the methods
described require equipment that is not readily available in the field, and are better suited
for use by manufacturing or a repair depot.
2.5.1 CPU Board (IP19 and IP21) Troubleshooting Procedures
This section describes common CPU board problems and their solutions.
2.5.1.1 Power Not Operating Within Acceptable Voltage Levels
Note: Before starting to troubleshoot the board, verify that both the 3.3V and 5.0V bricks
are working within acceptable levels. If the 5.0V brick fails while the 3.3V brick
continues to work, the ASICs will overheat.
1. Check the power fault LEDs on the board (see Figure 2-3).
2. If the fault LEDs are off, but the bricks are still suspect, check the voltages at the red
and black test points at the back of the board.