B.1 Power-Up with Inhibit Cable and XMI-1 Modules
Installed
When the key switch is turned from Off to Standby with the H7242 inhibit
cable installed and with no Model 500 CPUs, the following H7206-B LEDs
are lit:
• L1 (green) - +14V bias present
• L5 (red) - VAXBI H7215 fault
• L6 (red) - VAXBI H7214 fault
• L8 (red) - XMI-1 module in XMI-2 card cage
The green LED on the XMI-side H7214 power regulator should be lit. The
green LED on the H7242 power regulator should be off; it will always be
off with the H7242 inhibit cable installed. If the power control/status cable
is installed upside down, the XMI side will shut down almost immediately.
The green LEDs on both VAXBI power regulators will be off.
When the key switch is turned from Standby to Enable or Secure, L5 and
L6 on the H7206-B should go out (see Figure 3–8), and the green LEDs
on each VAXBI power regulator will light. L8 will remain on, since XMI-1
modules are installed in the XMI-2.
If L5 and L6 do not go out, check that the control/status cable (17-01666-
01) for the VAXBI side is installed correctly. If it is not connected, LEDs
L5 and L6 (VAXBI H7215 and H7214 failure) on the power and logic unit
will be off, since the active pulldown to turn the LEDs off comes from the
regulators.
Check that the +300V bulk power cable to the VAXBI side is connected at
the regulators and at the H7206-B (connector J3).
WARNING:
Never make or break +300V connections with power applied.
Disconnect input power and wait 2 minutes to allow the filter capacitors
to discharge (bleed down) to zero volts before making or breaking any
connections.
If L9 is lit, indicating a fault, and the XMI side is okay, check the interlock
2-pin Mate-N-Lok connector under the H7215 and recheck the VAXBI
door (listen for the faint click of the microswitch). Correcting the door
or interlock switch connection should automatically clear the fault without
your having to recycle power at the key switch or having to press the H7206-
B reset switch.
B–2
VAX 6000 XMI Conversion Manual
