Figure 3–8 shows passing patterns for the H7206-B LEDs. To power up
the system and generate the LED results, turn the key switch from Off to
Standby:
1. Listen for the click from the H405 power controller. This ensures that
the control panel is connected to the H7206-B and that the H7206-B
is connected to the H405. The STANDBY CMD L signal is sent from
the control panel, through the H7206-B and down to the H405 where
it causes an AC contactor to close, providing AC input power to the
H7206-B.
2. Look for the green bias LED (L1) lit on the H7206-B (see Figure 3–8).
This indicates that the internal bias power supply in the H7206-B
is active (deli14V). You should also notice the system fans
(including the small fan in the H7206) spin up. If they start and then
shut down about 30 seconds later, check the 24V power and airflow
sense cable. A 30 second delayed shutdown will only occur on detection
of insufficient airflow.
3. The red L5 (VAXBI H7215) and L6 (VAXBI H7214) LEDs are lit.
NOTE:
With the H7242 inhibit cable installed and with XMI-1 modules
installed in the XMI-2 card cage, the red L8 (XMI-1 module in XMI-2)
LED is lit. L8 is not lit when the inhibit cable is not installed and no
XMI-1 modules are in the XMI-2 card cage.
Turn the key switch from Standby to Enable/Secure:
1. The XMI side remains as is.
2. The VAXBI side now comes up. LED L5 (VAXBI H7215) and LED L6
(VAXBI H7214) on the H7206-B now go out.
NOTE:
With the H7242 inhibit cable installed and with XMI-1 modules
installed in the XMI-2 card cage, the red L8 (XMI-1 module in XMI-2)
LED remains lit. L8 is not lit when the inhibit cable is not installed
and no XMI-1 modules are in the XMI-2 card cage.
If the system does not power up or if you see any other combination of LEDs
lit, refer to Appendix B.
Wrap-Up and Troubleshooting
3–13
