Technical data

CHALLENGE/Onyx Diagnostic Road Map 3-5
3.2.2 System and Power Boards
This section provides the locations of the power fault indicators on each of the system and
power boards.
3.2.2.1 IP19 and IP21 CPU Board
The IP19 and IP21 boards have two power bricks that step down the 48 volts from the
midplane/backplane to 5.0 and 3.3 volts. Each brick has a corresponding power fault LED,
as shown in Figure 3-3.
Note: The LEDs are red and indicate a fault when lit.
Figure 3-3 IP19 and IP21 Board Power Fault Indicators and Power Brick Locations
3.2.2.2 MC3 Memory Board
The MC3 board currently has a single +5.0-volt power brick, and a corresponding fault
indicator. Later versions of this board may have an additional +3.3 volt brick, as shown in
Table 3-1 and Figure 3-4.
Note: The LEDs are red and indicate a fault when lit.
Fault LEDs
(one bank of four)
3.3V Power
Brick
5.0V Power
Brick
MSB
5.0 V Fault LED
(POKA_FAIL)
3.3 V Fault LED
(POKB_FAIL)